diff --git a/cadasta/organization/tests/test_urls_api.py b/cadasta/organization/tests/test_urls_api.py
index c7fe24839..b41fb098a 100644
--- a/cadasta/organization/tests/test_urls_api.py
+++ b/cadasta/organization/tests/test_urls_api.py
@@ -36,6 +36,11 @@ def test_organization_users_detail(self):
                         kwargs={'slug': 'org-slug', 'username': 'n_smith'}) ==
                 version_url('/organizations/org-slug/users/n_smith/'))
 
+        assert (reverse(version_ns('organization:users_detail'),
+                        kwargs={'slug': 'org-slug',
+                                'username': 'n_smith-@+.'}) ==
+                version_url('/organizations/org-slug/users/n_smith-@+./'))
+
         resolved = resolve(
             version_url('/organizations/org-slug/users/n_smith/'))
 
@@ -43,6 +48,13 @@ def test_organization_users_detail(self):
         assert resolved.kwargs['slug'] == 'org-slug'
         assert resolved.kwargs['username'] == 'n_smith'
 
+        resolved = resolve(
+            version_url('/organizations/org-slug/users/n_smith-@+./'))
+
+        assert resolved.func.__name__ == api.OrganizationUsersDetail.__name__
+        assert resolved.kwargs['slug'] == 'org-slug'
+        assert resolved.kwargs['username'] == 'n_smith-@+.'
+
 
 class ProjectUrlTest(TestCase):
 
@@ -96,9 +108,26 @@ def test_project_users_detail(self):
             '/organizations/habitat/projects/123abc/users/barbara/')
         assert actual == expected
 
+        actual = reverse(
+            version_ns('organization:project_users_detail'),
+            kwargs={'organization': 'habitat',
+                    'project': '123abc',
+                    'username': 'barbara-@+.'}
+        )
+        expected = version_url(
+            '/organizations/habitat/projects/123abc/users/barbara-@+./')
+        assert actual == expected
+
         resolved = resolve(version_url(
             '/organizations/habitat/projects/123abc/users/barbara/'))
         assert resolved.func.__name__ == api.ProjectUsersDetail.__name__
         assert resolved.kwargs['organization'] == 'habitat'
         assert resolved.kwargs['project'] == '123abc'
         assert resolved.kwargs['username'] == 'barbara'
+
+        resolved = resolve(version_url(
+            '/organizations/habitat/projects/123abc/users/barbara-@+./'))
+        assert resolved.func.__name__ == api.ProjectUsersDetail.__name__
+        assert resolved.kwargs['organization'] == 'habitat'
+        assert resolved.kwargs['project'] == '123abc'
+        assert resolved.kwargs['username'] == 'barbara-@+.'
diff --git a/cadasta/organization/tests/test_urls_default.py b/cadasta/organization/tests/test_urls_default.py
index 29a5aac0c..19a68fb6c 100644
--- a/cadasta/organization/tests/test_urls_default.py
+++ b/cadasta/organization/tests/test_urls_default.py
@@ -70,11 +70,19 @@ def test_user_activate(self):
         url = reverse('user:activate', kwargs={'user': 'user-name'})
         assert (url == '/users/user-name/activate/')
 
+        url = reverse('user:activate', kwargs={'user': 'user-name-with-+@.'})
+        assert (url == '/users/user-name-with-+@./activate/')
+
         resolved = resolve('/users/user-name/activate/')
         assert resolved.func.__name__ == default.UserActivation.__name__
         assert resolved.kwargs['user'] == 'user-name'
         assert resolved.func.view_initkwargs['new_state'] is True
 
+        resolved = resolve('/users/user-name-with-+@./activate/')
+        assert resolved.func.__name__ == default.UserActivation.__name__
+        assert resolved.kwargs['user'] == 'user-name-with-+@.'
+        assert resolved.func.view_initkwargs['new_state'] is True
+
     def test_user_deactivate(self):
         url = reverse('user:deactivate', kwargs={'user': 'user-name'})
         assert (url == '/users/user-name/deactivate/')
@@ -205,12 +213,26 @@ def test_member_edit(self):
         )
         assert url == '/organizations/org-slug/members/some-user/'
 
+        url = reverse(
+            'organization:members_edit',
+            kwargs={'slug': 'org-slug', 'username': 'some-user-with-+@.'}
+        )
+        assert url == '/organizations/org-slug/members/some-user-with-+@./'
+
         resolved = resolve('/organizations/org-slug/members/some-user/')
         assert (resolved.func.__name__ ==
                 default.OrganizationMembersEdit.__name__)
         assert resolved.kwargs['slug'] == 'org-slug'
         assert resolved.kwargs['username'] == 'some-user'
 
+        resolved = resolve(
+            '/organizations/org-slug/members/some-user-with-+@./'
+        )
+        assert (resolved.func.__name__ ==
+                default.OrganizationMembersEdit.__name__)
+        assert resolved.kwargs['slug'] == 'org-slug'
+        assert resolved.kwargs['username'] == 'some-user-with-+@.'
+
     def test_member_remove(self):
         url = reverse(
             'organization:members_remove',
@@ -218,8 +240,23 @@ def test_member_remove(self):
         )
         assert url == '/organizations/org-slug/members/some-user/remove/'
 
+        url = reverse(
+            'organization:members_remove',
+            kwargs={'slug': 'org-slug', 'username': 'some-user-with-+@.'}
+        )
+        assert (url ==
+                '/organizations/org-slug/members/some-user-with-+@./remove/')
+
         resolved = resolve('/organizations/org-slug/members/some-user/remove/')
         assert (resolved.func.__name__ ==
                 default.OrganizationMembersRemove.__name__)
         assert resolved.kwargs['slug'] == 'org-slug'
         assert resolved.kwargs['username'] == 'some-user'
+
+        resolved = resolve(
+            '/organizations/org-slug/members/some-user-with-+@./remove/'
+        )
+        assert (resolved.func.__name__ ==
+                default.OrganizationMembersRemove.__name__)
+        assert resolved.kwargs['slug'] == 'org-slug'
+        assert resolved.kwargs['username'] == 'some-user-with-+@.'
diff --git a/cadasta/organization/urls/api/organizations.py b/cadasta/organization/urls/api/organizations.py
index 7538544c6..ed56a2310 100644
--- a/cadasta/organization/urls/api/organizations.py
+++ b/cadasta/organization/urls/api/organizations.py
@@ -16,7 +16,7 @@
         api.OrganizationUsers.as_view(),
         name='users'),
     url(
-        r'^(?P<slug>[-\w]+)/users/(?P<username>[-\w]+)/$',
+        r'^(?P<slug>[-\w]+)/users/(?P<username>[-@+.\w]+)/$',
         api.OrganizationUsersDetail.as_view(),
         name='users_detail'),
     url(
@@ -33,7 +33,7 @@
         name='project_users'),
     url(
         r'^(?P<organization>[-\w]+)/projects/'
-        '(?P<project>[-\w]+)/users/(?P<username>[-\w]+)/$',
+        '(?P<project>[-\w]+)/users/(?P<username>[-@+.\w]+)/$',
         api.ProjectUsersDetail.as_view(),
         name='project_users_detail'),
 ]
diff --git a/cadasta/organization/urls/default/organizations.py b/cadasta/organization/urls/default/organizations.py
index f70bf8db9..1fce091af 100644
--- a/cadasta/organization/urls/default/organizations.py
+++ b/cadasta/organization/urls/default/organizations.py
@@ -79,11 +79,11 @@
         default.OrganizationMembersAdd.as_view(),
         name='members_add'),
     url(
-        r'^(?P<slug>[-\w]+)/members/(?P<username>[-\w]+)/$',
+        r'^(?P<slug>[-\w]+)/members/(?P<username>[-@+.\w]+)/$',
         default.OrganizationMembersEdit.as_view(),
         name='members_edit'),
     url(
-        r'^(?P<slug>[-\w]+)/members/(?P<username>[-\w]+)/remove/$',
+        r'^(?P<slug>[-\w]+)/members/(?P<username>[-@+.\w]+)/remove/$',
         default.OrganizationMembersRemove.as_view(),
         name='members_remove'),
 ]
diff --git a/cadasta/organization/urls/default/users.py b/cadasta/organization/urls/default/users.py
index d378a79e5..d8c0c3c48 100644
--- a/cadasta/organization/urls/default/users.py
+++ b/cadasta/organization/urls/default/users.py
@@ -4,10 +4,10 @@
 
 urlpatterns = [
     url(r'^$', default.UserList.as_view(), name='list'),
-    url(r'^(?P<user>[-\w]+)/activate/$',
+    url(r'^(?P<user>[-@+.\w]+)/activate/$',
         default.UserActivation.as_view(new_state=True),
         name='activate'),
-    url(r'^(?P<user>[-\w]+)/deactivate/$',
+    url(r'^(?P<user>[-@+.\w]+)/deactivate/$',
         default.UserActivation.as_view(new_state=False),
         name='deactivate')
 ]