diff --git a/src/epplibwrapper/__init__.py b/src/epplibwrapper/__init__.py
index b306dbd0e..65de3ec05 100644
--- a/src/epplibwrapper/__init__.py
+++ b/src/epplibwrapper/__init__.py
@@ -45,6 +45,7 @@ try:
     from .client import CLIENT, commands
     from .errors import RegistryError, ErrorCode
     from epplib.models import common
+    from epplib import responses
 except ImportError:
     pass
 
@@ -52,6 +53,7 @@ __all__ = [
     "CLIENT",
     "commands",
     "common",
+    "responses",
     "ErrorCode",
     "RegistryError",
 ]
diff --git a/src/registrar/admin.py b/src/registrar/admin.py
index e99e767bd..275f67bb3 100644
--- a/src/registrar/admin.py
+++ b/src/registrar/admin.py
@@ -6,10 +6,13 @@ from django.contrib.auth.admin import UserAdmin as BaseUserAdmin
 from django.contrib.contenttypes.models import ContentType
 from django.http.response import HttpResponseRedirect
 from django.urls import reverse
+from epplibwrapper.errors import ErrorCode, RegistryError
+from registrar.models.domain import Domain
 from registrar.models.utility.admin_sort_fields import AdminSortFields
 from . import models
 from auditlog.models import LogEntry  # type: ignore
 from auditlog.admin import LogEntryAdmin  # type: ignore
+from django_fsm import TransitionNotAllowed  # type: ignore
 
 logger = logging.getLogger(__name__)
 
@@ -716,16 +719,61 @@ class DomainAdmin(ListHeaderAdmin):
         return super().response_change(request, obj)
 
     def do_delete_domain(self, request, obj):
+        if not isinstance(obj, Domain):
+            # Could be problematic if the type is similar,
+            # but not the same (same field/func names).
+            # We do not want to accidentally delete records.
+            self.message_user(request, "Object is not of type Domain", messages.ERROR)
+            return
+
         try:
-            obj.deleted()
+            obj.deletedInEpp()
             obj.save()
-        except Exception as err:
-            self.message_user(request, err, messages.ERROR)
+        except RegistryError as err:
+            # Using variables to get past the linter
+            message1 = f"Cannot delete Domain when in state {obj.state}"
+            message2 = "This subdomain is being used as a hostname on another domain"
+            # Human-readable mappings of ErrorCodes. Can be expanded.
+            error_messages = {
+                # noqa on these items as black wants to reformat to an invalid length
+                ErrorCode.OBJECT_STATUS_PROHIBITS_OPERATION: message1,
+                ErrorCode.OBJECT_ASSOCIATION_PROHIBITS_OPERATION: message2,
+            }
+
+            message = "Cannot connect to the registry"
+            if not err.is_connection_error():
+                # If nothing is found, will default to returned err
+                message = error_messages.get(err.code, err)
+            self.message_user(
+                request, f"Error deleting this Domain: {message}", messages.ERROR
+            )
+        except TransitionNotAllowed:
+            if obj.state == Domain.State.DELETED:
+                self.message_user(
+                    request,
+                    "This domain is already deleted",
+                    messages.INFO,
+                )
+            else:
+                self.message_user(
+                    request,
+                    "Error deleting this Domain: "
+                    f"Can't switch from state '{obj.state}' to 'deleted'"
+                    ", must be either 'dns_needed' or 'on_hold'",
+                    messages.ERROR,
+                )
+        except Exception:
+            self.message_user(
+                request,
+                "Could not delete: An unspecified error occured",
+                messages.ERROR,
+            )
         else:
             self.message_user(
                 request,
-                ("Domain %s Should now be deleted " ". Thanks!") % obj.name,
+                ("Domain %s has been deleted. Thanks!") % obj.name,
             )
+
         return HttpResponseRedirect(".")
 
     def do_get_status(self, request, obj):
diff --git a/src/registrar/fixtures.py b/src/registrar/fixtures.py
index a4e75dd2e..521d632d6 100644
--- a/src/registrar/fixtures.py
+++ b/src/registrar/fixtures.py
@@ -82,6 +82,11 @@ class UserFixture:
             "first_name": "Nicolle",
             "last_name": "LeClair",
         },
+        {
+            "username": "24840450-bf47-4d89-8aa9-c612fe68f9da",
+            "first_name": "Erin",
+            "last_name": "Song",
+        },
     ]
 
     STAFF = [
@@ -134,6 +139,12 @@ class UserFixture:
             "last_name": "LeClair-Analyst",
             "email": "nicolle.leclair@ecstech.com",
         },
+        {
+            "username": "378d0bc4-d5a7-461b-bd84-3ae6f6864af9",
+            "first_name": "Erin-Analyst",
+            "last_name": "Song-Analyst",
+            "email": "erin.song+1@gsa.gov",
+        },
     ]
 
     STAFF_PERMISSIONS = [
diff --git a/src/registrar/models/domain.py b/src/registrar/models/domain.py
index 2c7f8703c..e45724a9b 100644
--- a/src/registrar/models/domain.py
+++ b/src/registrar/models/domain.py
@@ -2,7 +2,7 @@ import logging
 
 from datetime import date
 from string import digits
-from django_fsm import FSMField, transition  # type: ignore
+from django_fsm import FSMField, transition, TransitionNotAllowed  # type: ignore
 
 from django.db import models
 
@@ -609,11 +609,6 @@ class Domain(TimeStampedModel, DomainHelper):
         """
         return self.state == self.State.READY
 
-    def delete_request(self):
-        """Delete from host. Possibly a duplicate of _delete_host?"""
-        # TODO fix in ticket #901
-        pass
-
     def transfer(self):
         """Going somewhere. Not implemented."""
         raise NotImplementedError()
@@ -658,7 +653,7 @@ class Domain(TimeStampedModel, DomainHelper):
         """This domain should be deleted from the registry
         may raises RegistryError, should be caught or handled correctly by caller"""
         request = commands.DeleteDomain(name=self.name)
-        registry.send(request)
+        registry.send(request, cleaned=True)
 
     def __str__(self) -> str:
         return self.name
@@ -804,16 +799,32 @@ class Domain(TimeStampedModel, DomainHelper):
         self._remove_client_hold()
         # TODO -on the client hold ticket any additional error handling here
 
-    @transition(field="state", source=State.ON_HOLD, target=State.DELETED)
-    def deleted(self):
-        """domain is deleted in epp but is saved in our database"""
-        # TODO Domains may not be deleted if:
-        #  a child host is being used by
-        # another .gov domains.  The host must be first removed
-        # and/or renamed before the parent domain may be deleted.
-        logger.info("pendingCreate()-> inside pending create")
-        self._delete_domain()
-        # TODO - delete ticket any additional error handling here
+    @transition(
+        field="state", source=[State.ON_HOLD, State.DNS_NEEDED], target=State.DELETED
+    )
+    def deletedInEpp(self):
+        """Domain is deleted in epp but is saved in our database.
+        Error handling should be provided by the caller."""
+        # While we want to log errors, we want to preserve
+        # that information when this function is called.
+        # Human-readable errors are introduced at the admin.py level,
+        # as doing everything here would reduce reliablity.
+        try:
+            logger.info("deletedInEpp()-> inside _delete_domain")
+            self._delete_domain()
+        except RegistryError as err:
+            logger.error(f"Could not delete domain. Registry returned error: {err}")
+            raise err
+        except TransitionNotAllowed as err:
+            logger.error("Could not delete domain. FSM failure: {err}")
+            raise err
+        except Exception as err:
+            logger.error(
+                f"Could not delete domain. An unspecified error occured: {err}"
+            )
+            raise err
+        else:
+            self._invalidate_cache()
 
     @transition(
         field="state",
@@ -974,75 +985,38 @@ class Domain(TimeStampedModel, DomainHelper):
             # statuses can just be a list no need to keep the epp object
             if "statuses" in cleaned.keys():
                 cleaned["statuses"] = [status.state for status in cleaned["statuses"]]
+
+            # Capture and store old hosts and contacts from cache if they exist
+            old_cache_hosts = self._cache.get("hosts")
+            old_cache_contacts = self._cache.get("contacts")
+
             # get contact info, if there are any
             if (
-                # fetch_contacts and
-                "_contacts" in cleaned
+                fetch_contacts
+                and "_contacts" in cleaned
                 and isinstance(cleaned["_contacts"], list)
                 and len(cleaned["_contacts"])
             ):
-                cleaned["contacts"] = []
-                for domainContact in cleaned["_contacts"]:
-                    # we do not use _get_or_create_* because we expect the object we
-                    # just asked the registry for still exists --
-                    # if not, that's a problem
-
-                    # TODO- discuss-should we check if contact is in public contacts
-                    # and add it if not- this is really to keep in mine the transisiton
-                    req = commands.InfoContact(id=domainContact.contact)
-                    data = registry.send(req, cleaned=True).res_data[0]
-
-                    # extract properties from response
-                    # (Ellipsis is used to mean "null")
-                    # convert this to use PublicContactInstead
-                    contact = {
-                        "id": domainContact.contact,
-                        "type": domainContact.type,
-                        "auth_info": getattr(data, "auth_info", ...),
-                        "cr_date": getattr(data, "cr_date", ...),
-                        "disclose": getattr(data, "disclose", ...),
-                        "email": getattr(data, "email", ...),
-                        "fax": getattr(data, "fax", ...),
-                        "postal_info": getattr(data, "postal_info", ...),
-                        "statuses": getattr(data, "statuses", ...),
-                        "tr_date": getattr(data, "tr_date", ...),
-                        "up_date": getattr(data, "up_date", ...),
-                        "voice": getattr(data, "voice", ...),
-                    }
-
-                    cleaned["contacts"].append(
-                        {k: v for k, v in contact.items() if v is not ...}
-                    )
+                cleaned["contacts"] = self._fetch_contacts(cleaned["_contacts"])
+                # We're only getting contacts, so retain the old
+                # hosts that existed in cache (if they existed)
+                # and pass them along.
+                if old_cache_hosts is not None:
+                    cleaned["hosts"] = old_cache_hosts
 
             # get nameserver info, if there are any
             if (
-                # fetch_hosts and
-                "_hosts" in cleaned
+                fetch_hosts
+                and "_hosts" in cleaned
                 and isinstance(cleaned["_hosts"], list)
                 and len(cleaned["_hosts"])
             ):
-                # TODO- add elif in cache set it to be the old cache value
-                # no point in removing
-                cleaned["hosts"] = []
-                for name in cleaned["_hosts"]:
-                    # we do not use _get_or_create_* because we expect the object we
-                    # just asked the registry for still exists --
-                    # if not, that's a problem
-                    req = commands.InfoHost(name=name)
-                    data = registry.send(req, cleaned=True).res_data[0]
-                    # extract properties from response
-                    # (Ellipsis is used to mean "null")
-                    host = {
-                        "name": name,
-                        "addrs": getattr(data, "addrs", ...),
-                        "cr_date": getattr(data, "cr_date", ...),
-                        "statuses": getattr(data, "statuses", ...),
-                        "tr_date": getattr(data, "tr_date", ...),
-                        "up_date": getattr(data, "up_date", ...),
-                    }
-                    cleaned["hosts"].append(
-                        {k: v for k, v in host.items() if v is not ...}
-                    )
+                cleaned["hosts"] = self._fetch_hosts(cleaned["_hosts"])
+                # We're only getting hosts, so retain the old
+                # contacts that existed in cache (if they existed)
+                # and pass them along.
+                if old_cache_contacts is not None:
+                    cleaned["contacts"] = old_cache_contacts
 
             # replace the prior cache with new data
             self._cache = cleaned
@@ -1050,6 +1024,46 @@ class Domain(TimeStampedModel, DomainHelper):
         except RegistryError as e:
             logger.error(e)
 
+    def _fetch_contacts(self, contact_data):
+        """Fetch contact info."""
+        contacts = []
+        for domainContact in contact_data:
+            req = commands.InfoContact(id=domainContact.contact)
+            data = registry.send(req, cleaned=True).res_data[0]
+            contact = {
+                "id": domainContact.contact,
+                "type": domainContact.type,
+                "auth_info": getattr(data, "auth_info", ...),
+                "cr_date": getattr(data, "cr_date", ...),
+                "disclose": getattr(data, "disclose", ...),
+                "email": getattr(data, "email", ...),
+                "fax": getattr(data, "fax", ...),
+                "postal_info": getattr(data, "postal_info", ...),
+                "statuses": getattr(data, "statuses", ...),
+                "tr_date": getattr(data, "tr_date", ...),
+                "up_date": getattr(data, "up_date", ...),
+                "voice": getattr(data, "voice", ...),
+            }
+            contacts.append({k: v for k, v in contact.items() if v is not ...})
+        return contacts
+
+    def _fetch_hosts(self, host_data):
+        """Fetch host info."""
+        hosts = []
+        for name in host_data:
+            req = commands.InfoHost(name=name)
+            data = registry.send(req, cleaned=True).res_data[0]
+            host = {
+                "name": name,
+                "addrs": getattr(data, "addrs", ...),
+                "cr_date": getattr(data, "cr_date", ...),
+                "statuses": getattr(data, "statuses", ...),
+                "tr_date": getattr(data, "tr_date", ...),
+                "up_date": getattr(data, "up_date", ...),
+            }
+            hosts.append({k: v for k, v in host.items() if v is not ...})
+        return hosts
+
     def _invalidate_cache(self):
         """Remove cache data when updates are made."""
         self._cache = {}
diff --git a/src/registrar/models/domain_application.py b/src/registrar/models/domain_application.py
index 7df51baf4..68429d381 100644
--- a/src/registrar/models/domain_application.py
+++ b/src/registrar/models/domain_application.py
@@ -6,6 +6,7 @@ import logging
 from django.apps import apps
 from django.db import models
 from django_fsm import FSMField, transition  # type: ignore
+from registrar.models.domain import Domain
 
 from .utility.time_stamped_model import TimeStampedModel
 from ..utility.email import send_templated_email, EmailSendingError
@@ -610,9 +611,11 @@ class DomainApplication(TimeStampedModel):
 
         As side effects this will delete the domain and domain_information
         (will cascade), and send an email notification."""
-
         if self.status == self.APPROVED:
-            self.approved_domain.delete_request()
+            domain_state = self.approved_domain.state
+            # Only reject if it exists on EPP
+            if domain_state != Domain.State.UNKNOWN:
+                self.approved_domain.deletedInEpp()
             self.approved_domain.delete()
             self.approved_domain = None
 
@@ -638,7 +641,10 @@ class DomainApplication(TimeStampedModel):
         and domain_information (will cascade) when they exist."""
 
         if self.status == self.APPROVED:
-            self.approved_domain.delete_request()
+            domain_state = self.approved_domain.state
+            # Only reject if it exists on EPP
+            if domain_state != Domain.State.UNKNOWN:
+                self.approved_domain.deletedInEpp()
             self.approved_domain.delete()
             self.approved_domain = None
 
diff --git a/src/registrar/templates/django/admin/domain_change_form.html b/src/registrar/templates/django/admin/domain_change_form.html
index 1b8b90930..ac26fc922 100644
--- a/src/registrar/templates/django/admin/domain_change_form.html
+++ b/src/registrar/templates/django/admin/domain_change_form.html
@@ -15,7 +15,9 @@
         {% endif %}
         <input id="manageDomainSubmitButton" type="submit" value="Manage Domain" name="_edit_domain">
         <input type="submit" value="get status" name="_get_status">
-        <input type="submit" value="EPP Delete Domain" name="_delete_domain">
+        {% if original.state != original.State.DELETED %}
+        <input type="submit" value="Delete Domain in Registry" name="_delete_domain">
+        {% endif %}
     </div>
     {{ block.super }}
 {% endblock %}
diff --git a/src/registrar/tests/common.py b/src/registrar/tests/common.py
index fe41647f9..10c387099 100644
--- a/src/registrar/tests/common.py
+++ b/src/registrar/tests/common.py
@@ -604,6 +604,16 @@ class MockEppLib(TestCase):
             # use this for when a contact is being updated
             # sets the second send() to fail
             raise RegistryError(code=ErrorCode.OBJECT_EXISTS)
+        elif (
+            isinstance(_request, commands.DeleteDomain)
+            and getattr(_request, "name", None) == "failDelete.gov"
+        ):
+            name = getattr(_request, "name", None)
+            fake_nameserver = "ns1.failDelete.gov"
+            if name in fake_nameserver:
+                raise RegistryError(
+                    code=ErrorCode.OBJECT_ASSOCIATION_PROHIBITS_OPERATION
+                )
         return MagicMock(res_data=[self.mockDataInfoHosts])
 
     def setUp(self):
diff --git a/src/registrar/tests/test_admin.py b/src/registrar/tests/test_admin.py
index 9ff9ce451..def475536 100644
--- a/src/registrar/tests/test_admin.py
+++ b/src/registrar/tests/test_admin.py
@@ -49,6 +49,7 @@ class TestDomainAdmin(MockEppLib):
         self.client = Client(HTTP_HOST="localhost:8080")
         self.superuser = create_superuser()
         self.staffuser = create_user()
+        self.factory = RequestFactory()
         super().setUp()
 
     def test_place_and_remove_hold(self):
@@ -87,6 +88,155 @@ class TestDomainAdmin(MockEppLib):
         self.assertContains(response, "Place hold")
         self.assertNotContains(response, "Remove hold")
 
+    def test_deletion_is_successful(self):
+        """
+        Scenario: Domain deletion is unsuccessful
+            When the domain is deleted
+            Then a user-friendly success message is returned for displaying on the web
+            And `state` is et to `DELETED`
+        """
+        domain = create_ready_domain()
+        # Put in client hold
+        domain.place_client_hold()
+        p = "userpass"
+        self.client.login(username="staffuser", password=p)
+
+        # Ensure everything is displaying correctly
+        response = self.client.get(
+            "/admin/registrar/domain/{}/change/".format(domain.pk),
+            follow=True,
+        )
+        self.assertEqual(response.status_code, 200)
+        self.assertContains(response, domain.name)
+        self.assertContains(response, "Delete Domain in Registry")
+
+        # Test the info dialog
+        request = self.factory.post(
+            "/admin/registrar/domain/{}/change/".format(domain.pk),
+            {"_delete_domain": "Delete Domain in Registry", "name": domain.name},
+            follow=True,
+        )
+        request.user = self.client
+
+        with patch("django.contrib.messages.add_message") as mock_add_message:
+            self.admin.do_delete_domain(request, domain)
+            mock_add_message.assert_called_once_with(
+                request,
+                messages.INFO,
+                "Domain city.gov has been deleted. Thanks!",
+                extra_tags="",
+                fail_silently=False,
+            )
+
+        self.assertEqual(domain.state, Domain.State.DELETED)
+
+    def test_deletion_ready_fsm_failure(self):
+        """
+        Scenario: Domain deletion is unsuccessful
+            When an error is returned from epplibwrapper
+            Then a user-friendly error message is returned for displaying on the web
+            And `state` is not set to `DELETED`
+        """
+        domain = create_ready_domain()
+        p = "userpass"
+        self.client.login(username="staffuser", password=p)
+
+        # Ensure everything is displaying correctly
+        response = self.client.get(
+            "/admin/registrar/domain/{}/change/".format(domain.pk),
+            follow=True,
+        )
+        self.assertEqual(response.status_code, 200)
+        self.assertContains(response, domain.name)
+        self.assertContains(response, "Delete Domain in Registry")
+
+        # Test the error
+        request = self.factory.post(
+            "/admin/registrar/domain/{}/change/".format(domain.pk),
+            {"_delete_domain": "Delete Domain in Registry", "name": domain.name},
+            follow=True,
+        )
+        request.user = self.client
+
+        with patch("django.contrib.messages.add_message") as mock_add_message:
+            self.admin.do_delete_domain(request, domain)
+            mock_add_message.assert_called_once_with(
+                request,
+                messages.ERROR,
+                "Error deleting this Domain: "
+                "Can't switch from state 'ready' to 'deleted'"
+                ", must be either 'dns_needed' or 'on_hold'",
+                extra_tags="",
+                fail_silently=False,
+            )
+
+        self.assertEqual(domain.state, Domain.State.READY)
+
+    def test_analyst_deletes_domain_idempotent(self):
+        """
+        Scenario: Analyst tries to delete an already deleted domain
+            Given `state` is already `DELETED`
+            When `domain.deletedInEpp()` is called
+            Then `commands.DeleteDomain` is sent to the registry
+            And Domain returns normally without an error dialog
+        """
+        domain = create_ready_domain()
+        # Put in client hold
+        domain.place_client_hold()
+        p = "userpass"
+        self.client.login(username="staffuser", password=p)
+
+        # Ensure everything is displaying correctly
+        response = self.client.get(
+            "/admin/registrar/domain/{}/change/".format(domain.pk),
+            follow=True,
+        )
+        self.assertEqual(response.status_code, 200)
+        self.assertContains(response, domain.name)
+        self.assertContains(response, "Delete Domain in Registry")
+
+        # Test the info dialog
+        request = self.factory.post(
+            "/admin/registrar/domain/{}/change/".format(domain.pk),
+            {"_delete_domain": "Delete Domain in Registry", "name": domain.name},
+            follow=True,
+        )
+        request.user = self.client
+
+        # Delete it once
+        with patch("django.contrib.messages.add_message") as mock_add_message:
+            self.admin.do_delete_domain(request, domain)
+            mock_add_message.assert_called_once_with(
+                request,
+                messages.INFO,
+                "Domain city.gov has been deleted. Thanks!",
+                extra_tags="",
+                fail_silently=False,
+            )
+
+        self.assertEqual(domain.state, Domain.State.DELETED)
+
+        # Try to delete it again
+        # Test the info dialog
+        request = self.factory.post(
+            "/admin/registrar/domain/{}/change/".format(domain.pk),
+            {"_delete_domain": "Delete Domain in Registry", "name": domain.name},
+            follow=True,
+        )
+        request.user = self.client
+
+        with patch("django.contrib.messages.add_message") as mock_add_message:
+            self.admin.do_delete_domain(request, domain)
+            mock_add_message.assert_called_once_with(
+                request,
+                messages.INFO,
+                "This domain is already deleted",
+                extra_tags="",
+                fail_silently=False,
+            )
+
+        self.assertEqual(domain.state, Domain.State.DELETED)
+
     @skip("Waiting on epp lib to implement")
     def test_place_and_remove_hold_epp(self):
         raise
@@ -138,8 +288,9 @@ class TestDomainApplicationAdminForm(TestCase):
         )
 
 
-class TestDomainApplicationAdmin(TestCase):
+class TestDomainApplicationAdmin(MockEppLib):
     def setUp(self):
+        super().setUp()
         self.site = AdminSite()
         self.factory = RequestFactory()
         self.admin = DomainApplicationAdmin(
@@ -690,6 +841,7 @@ class TestDomainApplicationAdmin(TestCase):
             domain_information.refresh_from_db()
 
     def tearDown(self):
+        super().tearDown()
         Domain.objects.all().delete()
         DomainInformation.objects.all().delete()
         DomainApplication.objects.all().delete()
diff --git a/src/registrar/tests/test_models_domain.py b/src/registrar/tests/test_models_domain.py
index 54045bb32..bf258db31 100644
--- a/src/registrar/tests/test_models_domain.py
+++ b/src/registrar/tests/test_models_domain.py
@@ -5,7 +5,7 @@ This file tests the various ways in which the registrar interacts with the regis
 """
 from django.test import TestCase
 from django.db.utils import IntegrityError
-from unittest.mock import patch, call
+from unittest.mock import MagicMock, patch, call
 import datetime
 from registrar.models import Domain
 
@@ -16,10 +16,11 @@ from registrar.models.draft_domain import DraftDomain
 from registrar.models.public_contact import PublicContact
 from registrar.models.user import User
 from .common import MockEppLib
-
+from django_fsm import TransitionNotAllowed  # type: ignore
 from epplibwrapper import (
     commands,
     common,
+    responses,
     RegistryError,
     ErrorCode,
 )
@@ -51,8 +52,6 @@ class TestDomainCache(MockEppLib):
                     commands.InfoDomain(name="igorville.gov", auth_info=None),
                     cleaned=True,
                 ),
-                call(commands.InfoContact(id="123", auth_info=None), cleaned=True),
-                call(commands.InfoHost(name="fake.host.com"), cleaned=True),
             ],
             any_order=False,  # Ensure calls are in the specified order
         )
@@ -74,8 +73,6 @@ class TestDomainCache(MockEppLib):
             call(
                 commands.InfoDomain(name="igorville.gov", auth_info=None), cleaned=True
             ),
-            call(commands.InfoContact(id="123", auth_info=None), cleaned=True),
-            call(commands.InfoHost(name="fake.host.com"), cleaned=True),
         ]
 
         self.mockedSendFunction.assert_has_calls(expectedCalls)
@@ -110,6 +107,19 @@ class TestDomainCache(MockEppLib):
         # get and check hosts is set correctly
         domain._get_property("hosts")
         self.assertEqual(domain._cache["hosts"], [expectedHostsDict])
+        self.assertEqual(domain._cache["contacts"], [expectedContactsDict])
+
+        # invalidate cache
+        domain._cache = {}
+
+        # get host
+        domain._get_property("hosts")
+        self.assertEqual(domain._cache["hosts"], [expectedHostsDict])
+
+        # get contacts
+        domain._get_property("contacts")
+        self.assertEqual(domain._cache["hosts"], [expectedHostsDict])
+        self.assertEqual(domain._cache["contacts"], [expectedContactsDict])
 
     def tearDown(self) -> None:
         Domain.objects.all().delete()
@@ -170,8 +180,6 @@ class TestDomainCreation(MockEppLib):
                     commands.InfoDomain(name="beef-tongue.gov", auth_info=None),
                     cleaned=True,
                 ),
-                call(commands.InfoContact(id="123", auth_info=None), cleaned=True),
-                call(commands.InfoHost(name="fake.host.com"), cleaned=True),
             ],
             any_order=False,  # Ensure calls are in the specified order
         )
@@ -221,8 +229,6 @@ class TestDomainStatuses(MockEppLib):
                     commands.InfoDomain(name="chicken-liver.gov", auth_info=None),
                     cleaned=True,
                 ),
-                call(commands.InfoContact(id="123", auth_info=None), cleaned=True),
-                call(commands.InfoHost(name="fake.host.com"), cleaned=True),
             ],
             any_order=False,  # Ensure calls are in the specified order
         )
@@ -263,6 +269,114 @@ class TestDomainStatuses(MockEppLib):
         super().tearDown()
 
 
+class TestDomainAvailable(MockEppLib):
+    """Test Domain.available"""
+
+    # No SetUp or tearDown necessary for these tests
+
+    def test_domain_available(self):
+        """
+        Scenario: Testing whether an available domain is available
+            Should return True
+
+            Mock response to mimic EPP Response
+            Validate CheckDomain command is called
+            Validate response given mock
+        """
+
+        def side_effect(_request, cleaned):
+            return MagicMock(
+                res_data=[
+                    responses.check.CheckDomainResultData(
+                        name="available.gov", avail=True, reason=None
+                    )
+                ],
+            )
+
+        patcher = patch("registrar.models.domain.registry.send")
+        mocked_send = patcher.start()
+        mocked_send.side_effect = side_effect
+
+        available = Domain.available("available.gov")
+        mocked_send.assert_has_calls(
+            [
+                call(
+                    commands.CheckDomain(
+                        ["available.gov"],
+                    ),
+                    cleaned=True,
+                )
+            ]
+        )
+        self.assertTrue(available)
+        patcher.stop()
+
+    def test_domain_unavailable(self):
+        """
+        Scenario: Testing whether an unavailable domain is available
+            Should return False
+
+            Mock response to mimic EPP Response
+            Validate CheckDomain command is called
+            Validate response given mock
+        """
+
+        def side_effect(_request, cleaned):
+            return MagicMock(
+                res_data=[
+                    responses.check.CheckDomainResultData(
+                        name="unavailable.gov", avail=False, reason="In Use"
+                    )
+                ],
+            )
+
+        patcher = patch("registrar.models.domain.registry.send")
+        mocked_send = patcher.start()
+        mocked_send.side_effect = side_effect
+
+        available = Domain.available("unavailable.gov")
+        mocked_send.assert_has_calls(
+            [
+                call(
+                    commands.CheckDomain(
+                        ["unavailable.gov"],
+                    ),
+                    cleaned=True,
+                )
+            ]
+        )
+        self.assertFalse(available)
+        patcher.stop()
+
+    def test_domain_available_with_value_error(self):
+        """
+        Scenario: Testing whether an invalid domain is available
+            Should throw ValueError
+
+            Validate ValueError is raised
+        """
+        with self.assertRaises(ValueError):
+            Domain.available("invalid-string")
+
+    def test_domain_available_unsuccessful(self):
+        """
+        Scenario: Testing behavior when registry raises a RegistryError
+
+            Validate RegistryError is raised
+        """
+
+        def side_effect(_request, cleaned):
+            raise RegistryError(code=ErrorCode.COMMAND_SYNTAX_ERROR)
+
+        patcher = patch("registrar.models.domain.registry.send")
+        mocked_send = patcher.start()
+        mocked_send.side_effect = side_effect
+
+        with self.assertRaises(RegistryError):
+            Domain.available("raises-error.gov")
+        patcher.stop()
+
+
 class TestRegistrantContacts(MockEppLib):
     """Rule: Registrants may modify their WHOIS data"""
 
@@ -940,7 +1054,7 @@ class TestAnalystLock(TestCase):
         raise
 
 
-class TestAnalystDelete(TestCase):
+class TestAnalystDelete(MockEppLib):
     """Rule: Analysts may delete a domain"""
 
     def setUp(self):
@@ -949,35 +1063,99 @@ class TestAnalystDelete(TestCase):
             Given the analyst is logged in
             And a domain exists in the registry
         """
-        pass
+        super().setUp()
+        self.domain, _ = Domain.objects.get_or_create(
+            name="fake.gov", state=Domain.State.READY
+        )
+        self.domain_on_hold, _ = Domain.objects.get_or_create(
+            name="fake-on-hold.gov", state=Domain.State.ON_HOLD
+        )
+
+    def tearDown(self):
+        Domain.objects.all().delete()
+        super().tearDown()
 
-    @skip("not implemented yet")
     def test_analyst_deletes_domain(self):
         """
         Scenario: Analyst permanently deletes a domain
-            When `domain.delete()` is called
+            When `domain.deletedInEpp()` is called
             Then `commands.DeleteDomain` is sent to the registry
             And `state` is set to `DELETED`
         """
-        raise
+        # Put the domain in client hold
+        self.domain.place_client_hold()
+        # Delete it...
+        self.domain.deletedInEpp()
+        self.mockedSendFunction.assert_has_calls(
+            [
+                call(
+                    commands.DeleteDomain(name="fake.gov"),
+                    cleaned=True,
+                )
+            ]
+        )
 
-    @skip("not implemented yet")
-    def test_analyst_deletes_domain_idempotent(self):
-        """
-        Scenario: Analyst tries to delete an already deleted domain
-            Given `state` is already `DELETED`
-            When `domain.delete()` is called
-            Then `commands.DeleteDomain` is sent to the registry
-            And Domain returns normally (without error)
-        """
-        raise
+        # Domain itself should not be deleted
+        self.assertNotEqual(self.domain, None)
+
+        # Domain should have the right state
+        self.assertEqual(self.domain.state, Domain.State.DELETED)
+
+        # Cache should be invalidated
+        self.assertEqual(self.domain._cache, {})
 
-    @skip("not implemented yet")
     def test_deletion_is_unsuccessful(self):
         """
         Scenario: Domain deletion is unsuccessful
-            When an error is returned from epplibwrapper
-            Then a user-friendly error message is returned for displaying on the web
+            When a subdomain exists
+            Then a client error is returned of code 2305
             And `state` is not set to `DELETED`
         """
-        raise
+        # Desired domain
+        domain, _ = Domain.objects.get_or_create(
+            name="failDelete.gov", state=Domain.State.ON_HOLD
+        )
+        # Put the domain in client hold
+        domain.place_client_hold()
+
+        # Delete it
+        with self.assertRaises(RegistryError) as err:
+            domain.deletedInEpp()
+            self.assertTrue(
+                err.is_client_error()
+                and err.code == ErrorCode.OBJECT_ASSOCIATION_PROHIBITS_OPERATION
+            )
+        self.mockedSendFunction.assert_has_calls(
+            [
+                call(
+                    commands.DeleteDomain(name="failDelete.gov"),
+                    cleaned=True,
+                )
+            ]
+        )
+
+        # Domain itself should not be deleted
+        self.assertNotEqual(domain, None)
+        # State should not have changed
+        self.assertEqual(domain.state, Domain.State.ON_HOLD)
+
+    def test_deletion_ready_fsm_failure(self):
+        """
+        Scenario: Domain deletion is unsuccessful due to FSM rules
+            Given state is 'ready'
+            When `domain.deletedInEpp()` is called
+            and domain is of `state` is `READY`
+            Then an FSM error is returned
+            And `state` is not set to `DELETED`
+        """
+        self.assertEqual(self.domain.state, Domain.State.READY)
+        with self.assertRaises(TransitionNotAllowed) as err:
+            self.domain.deletedInEpp()
+            self.assertTrue(
+                err.is_client_error()
+                and err.code == ErrorCode.OBJECT_STATUS_PROHIBITS_OPERATION
+            )
+        # Domain should not be deleted
+        self.assertNotEqual(self.domain, None)
+        # Domain should have the right state
+        self.assertEqual(self.domain.state, Domain.State.READY)
diff --git a/src/requirements.txt b/src/requirements.txt
index 52ded59fc..a5972c4dc 100644
--- a/src/requirements.txt
+++ b/src/requirements.txt
@@ -7,7 +7,7 @@ certifi==2023.7.22 ; python_version >= '3.6'
 cfenv==0.5.3
 cffi==1.15.1
 charset-normalizer==3.1.0 ; python_full_version >= '3.7.0'
-cryptography==41.0.3 ; python_version >= '3.7'
+cryptography==41.0.4 ; python_version >= '3.7'
 defusedxml==0.7.1 ; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'
 dj-database-url==2.0.0
 dj-email-url==1.0.6