diff --git a/alembic/versions/fd0cf917f682_add_soft_delete_to_applications_and_.py b/alembic/versions/fd0cf917f682_add_soft_delete_to_applications_and_.py
new file mode 100644
index 00000000..86949bd9
--- /dev/null
+++ b/alembic/versions/fd0cf917f682_add_soft_delete_to_applications_and_.py
@@ -0,0 +1,31 @@
+"""add soft delete to applications and environments
+
+Revision ID: fd0cf917f682
+Revises: 32438a35cfb5
+Create Date: 2019-04-09 06:16:15.445951
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.sql import expression
+
+
+# revision identifiers, used by Alembic.
+revision = 'fd0cf917f682'
+down_revision = '32438a35cfb5'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('applications', sa.Column('deleted', sa.Boolean(), nullable=False, server_default=expression.false()))
+    op.add_column('environments', sa.Column('deleted', sa.Boolean(), nullable=False, server_default=expression.false()))
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('environments', 'deleted')
+    op.drop_column('applications', 'deleted')
+    # ### end Alembic commands ###
diff --git a/atst/domain/applications.py b/atst/domain/applications.py
index 30884c59..1639e7e2 100644
--- a/atst/domain/applications.py
+++ b/atst/domain/applications.py
@@ -1,3 +1,5 @@
+from sqlalchemy.orm.exc import NoResultFound
+
 from atst.database import db
 from atst.domain.environments import Environments
 from atst.domain.exceptions import NotFoundError
@@ -23,7 +25,9 @@ class Applications(object):
     def get(cls, application_id):
         try:
             application = (
-                db.session.query(Application).filter_by(id=application_id).one()
+                db.session.query(Application)
+                .filter_by(id=application_id, deleted=False)
+                .one()
             )
         except NoResultFound:
             raise NotFoundError("application")
diff --git a/atst/domain/environments.py b/atst/domain/environments.py
index 9b0fa9b5..4682adcd 100644
--- a/atst/domain/environments.py
+++ b/atst/domain/environments.py
@@ -51,7 +51,11 @@ class Environments(object):
     @classmethod
     def get(cls, environment_id):
         try:
-            env = db.session.query(Environment).filter_by(id=environment_id).one()
+            env = (
+                db.session.query(Environment)
+                .filter_by(id=environment_id, deleted=False)
+                .one()
+            )
         except NoResultFound:
             raise NotFoundError("environment")
 
diff --git a/atst/models/application.py b/atst/models/application.py
index d10bd773..d29998f7 100644
--- a/atst/models/application.py
+++ b/atst/models/application.py
@@ -1,4 +1,4 @@
-from sqlalchemy import Column, ForeignKey, String
+from sqlalchemy import Column, ForeignKey, String, Boolean
 from sqlalchemy.orm import relationship
 
 from atst.models import Base
@@ -15,9 +15,15 @@ class Application(Base, mixins.TimestampsMixin, mixins.AuditableMixin):
 
     portfolio_id = Column(ForeignKey("portfolios.id"), nullable=False)
     portfolio = relationship("Portfolio")
-    environments = relationship("Environment", back_populates="application")
+    environments = relationship(
+        "Environment",
+        back_populates="application",
+        primaryjoin="and_(Environment.application_id==Application.id, Environment.deleted==False)",
+    )
     roles = relationship("ApplicationRole")
 
+    deleted = Column(Boolean, default=False)
+
     @property
     def users(self):
         return set(role.user for role in self.roles)
diff --git a/atst/models/environment.py b/atst/models/environment.py
index a520e787..5f1e19d2 100644
--- a/atst/models/environment.py
+++ b/atst/models/environment.py
@@ -1,4 +1,4 @@
-from sqlalchemy import Column, ForeignKey, String
+from sqlalchemy import Column, ForeignKey, String, Boolean
 from sqlalchemy.orm import relationship
 
 from atst.models import Base
@@ -17,6 +17,8 @@ class Environment(Base, mixins.TimestampsMixin, mixins.AuditableMixin):
 
     cloud_id = Column(String)
 
+    deleted = Column(Boolean, default=False)
+
     @property
     def users(self):
         return [r.user for r in self.roles]
diff --git a/atst/models/portfolio.py b/atst/models/portfolio.py
index 599de3e6..23c19482 100644
--- a/atst/models/portfolio.py
+++ b/atst/models/portfolio.py
@@ -16,7 +16,11 @@ class Portfolio(Base, mixins.TimestampsMixin, mixins.AuditableMixin):
     name = Column(String)
     defense_component = Column(String)  # Department of Defense Component
 
-    applications = relationship("Application", back_populates="portfolio")
+    applications = relationship(
+        "Application",
+        back_populates="portfolio",
+        primaryjoin="and_(Application.portfolio_id==Portfolio.id, Application.deleted==False)",
+    )
     roles = relationship("PortfolioRole")
 
     task_orders = relationship("TaskOrder")
diff --git a/tests/domain/test_applications.py b/tests/domain/test_applications.py
index 98dde0e2..8756bb7c 100644
--- a/tests/domain/test_applications.py
+++ b/tests/domain/test_applications.py
@@ -1,6 +1,9 @@
+import pytest
+
 from atst.domain.applications import Applications
-from tests.factories import UserFactory, PortfolioFactory
-from atst.domain.portfolios import Portfolios
+from atst.domain.exceptions import NotFoundError
+
+from tests.factories import ApplicationFactory, UserFactory, PortfolioFactory
 
 
 def test_create_application_with_multiple_environments():
@@ -53,3 +56,9 @@ def test_can_only_update_name_and_description():
     assert application.description == "a new application"
     assert len(application.environments) == 1
     assert application.environments[0].name == env_name
+
+
+def test_get_excludes_deleted():
+    app = ApplicationFactory.create(deleted=True)
+    with pytest.raises(NotFoundError):
+        Applications.get(app.id)
diff --git a/tests/domain/test_environments.py b/tests/domain/test_environments.py
index dee03fb6..c51b878c 100644
--- a/tests/domain/test_environments.py
+++ b/tests/domain/test_environments.py
@@ -1,8 +1,16 @@
+import pytest
+
 from atst.domain.environments import Environments
 from atst.domain.environment_roles import EnvironmentRoles
 from atst.domain.portfolio_roles import PortfolioRoles
+from atst.domain.exceptions import NotFoundError
 
-from tests.factories import ApplicationFactory, UserFactory, PortfolioFactory
+from tests.factories import (
+    ApplicationFactory,
+    UserFactory,
+    PortfolioFactory,
+    EnvironmentFactory,
+)
 
 
 def test_create_environments():
@@ -186,3 +194,11 @@ def test_get_scoped_environments(db):
 
     application2_envs = Environments.for_user(developer, portfolio.applications[1])
     assert [env.name for env in application2_envs] == ["application2 staging"]
+
+
+def test_get_excludes_deleted():
+    env = EnvironmentFactory.create(
+        deleted=True, application=ApplicationFactory.create()
+    )
+    with pytest.raises(NotFoundError):
+        Environments.get(env.id)
diff --git a/tests/factories.py b/tests/factories.py
index f9b5af17..29dc7fa0 100644
--- a/tests/factories.py
+++ b/tests/factories.py
@@ -105,7 +105,7 @@ class PortfolioFactory(Base):
     class Meta:
         model = Portfolio
 
-    name = factory.Faker("name")
+    name = factory.Faker("domain_word")
     defense_component = factory.LazyFunction(random_service_branch)
 
     @classmethod
@@ -157,7 +157,7 @@ class ApplicationFactory(Base):
         model = Application
 
     portfolio = factory.SubFactory(PortfolioFactory)
-    name = factory.Faker("name")
+    name = factory.Faker("domain_word")
     description = "A test application"
 
     @classmethod
@@ -192,6 +192,8 @@ class EnvironmentFactory(Base):
     class Meta:
         model = Environment
 
+    name = factory.Faker("domain_word")
+
     @classmethod
     def _create(cls, model_class, *args, **kwargs):
         with_members = kwargs.pop("members", [])
diff --git a/tests/models/test_application.py b/tests/models/test_application.py
index d7bf564b..1aded029 100644
--- a/tests/models/test_application.py
+++ b/tests/models/test_application.py
@@ -1,4 +1,8 @@
-from tests.factories import ApplicationFactory, ApplicationRoleFactory
+from tests.factories import (
+    ApplicationFactory,
+    ApplicationRoleFactory,
+    EnvironmentFactory,
+)
 
 
 def test_application_num_users():
@@ -9,3 +13,11 @@ def test_application_num_users():
 
     ApplicationRoleFactory.create(application=application)
     assert application.num_users == 1
+
+
+def test_application_environments_excludes_deleted():
+    app = ApplicationFactory.create()
+    env = EnvironmentFactory.create(application=app)
+    EnvironmentFactory.create(application=app, deleted=True)
+    assert len(app.environments) == 1
+    assert app.environments[0].id == env.id
diff --git a/tests/models/test_portfolio.py b/tests/models/test_portfolio.py
new file mode 100644
index 00000000..613b6435
--- /dev/null
+++ b/tests/models/test_portfolio.py
@@ -0,0 +1,9 @@
+from tests.factories import ApplicationFactory, PortfolioFactory
+
+
+def test_portfolio_applications_excludes_deleted():
+    portfolio = PortfolioFactory.create()
+    app = ApplicationFactory.create(portfolio=portfolio)
+    ApplicationFactory.create(portfolio=portfolio, deleted=True)
+    assert len(portfolio.applications) == 1
+    assert portfolio.applications[0].id == app.id