diff --git a/.rubocop.yml b/.rubocop.yml
index 8fe38aee7f..6f596d01b8 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -16,6 +16,9 @@ AllCops:
     - app/api/search_consumer/**/*
     - app/controllers/sites/templated_font_and_colors_controller.rb
     - app/controllers/sites/templates_controller.rb
+    # The Agencies API is deprecated and will be removed - SRCH-1574
+    - app/controllers/api/v1/agencies_controller.rb
+    - app/controllers/api/v2/agencies_controller.rb
 
 Metrics/BlockLength:
   Exclude:
diff --git a/app/controllers/api/v1/agencies_controller.rb b/app/controllers/api/v1/agencies_controller.rb
index 7c80737f21..eeb535e06c 100644
--- a/app/controllers/api/v1/agencies_controller.rb
+++ b/app/controllers/api/v1/agencies_controller.rb
@@ -1,3 +1,4 @@
+# deprecated: SRCH-1574
 module Api
   module V1
     class AgenciesController < ApplicationController
diff --git a/app/controllers/api/v1/search_controller.rb b/app/controllers/api/v1/search_controller.rb
new file mode 100644
index 0000000000..82da0faee5
--- /dev/null
+++ b/app/controllers/api/v1/search_controller.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+module Api
+  module V1
+    class SearchController < ApplicationController
+      DEPRECATION_MESSAGE = 'This API endpoint has been deprecated. Please refer to https://search.gov/developer/ for information on current Search.gov APIs.'
+
+      def search
+        render plain: DEPRECATION_MESSAGE, status: :not_found
+      end
+    end
+  end
+end
diff --git a/app/controllers/api/v2/agencies_controller.rb b/app/controllers/api/v2/agencies_controller.rb
index 871ccc29ea..3ac43c4b85 100644
--- a/app/controllers/api/v2/agencies_controller.rb
+++ b/app/controllers/api/v2/agencies_controller.rb
@@ -1,3 +1,4 @@
+# deprecated: SRCH-1574
 module Api
   module V2
     class AgenciesController < ApplicationController
diff --git a/app/controllers/api_controller.rb b/app/controllers/api_controller.rb
deleted file mode 100644
index ce6143efb6..0000000000
--- a/app/controllers/api_controller.rb
+++ /dev/null
@@ -1,43 +0,0 @@
-class ApiController < ApplicationController
-  DEFAULT_API_PER_PAGE = 10.freeze
-  before_action :load_affiliate
-
-  def search
-    @search_options = search_options_from_params.merge(
-      format: params[:format], index: params[:index], per_page: DEFAULT_API_PER_PAGE, lat_lon: params[:lat_lon])
-    @search = ApiSearch.new(@search_options)
-    results = @search.run
-    SearchImpression.log(@search, get_vertical(params[:index]), params, request)
-    respond_to do |format|
-      format.xml { render :xml => results }
-      format.json { render(:json => results) }
-    end
-  rescue ActionController::UnknownFormat
-    head :not_acceptable
-  end
-
-  private
-
-  def load_affiliate
-    @affiliate = Affiliate.active.find_by_name(params[:affiliate].to_s) if params[:affiliate].present?
-    unless @affiliate and WhitelistedV1ApiHandle.exists?(handle: @affiliate.name)
-      render plain: 'Not Found', status: 404
-      false
-    end
-  end
-
-  def get_vertical(index)
-    case index
-      when "news"
-        :news
-      when "videonews"
-        :news
-      when "images"
-        :image
-      when "docs"
-        :docs
-      else
-        :web
-    end
-  end
-end
diff --git a/config/routes.rb b/config/routes.rb
index 53c6946c80..14ac4e31c1 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -3,7 +3,6 @@
   concern :active_scaffold_association, ActiveScaffold::Routing::Association.new
   concern :active_scaffold, ActiveScaffold::Routing::Basic.new(association: true)
   get '/search' => 'searches#index', as: :search
-  get '/api/search' => 'api#search', as: :api_search
   get '/search/advanced' => 'searches#advanced', as: :advanced_search
   get '/search/images' => 'image_searches#index', as: :image_search
   get '/search/docs' => 'searches#docs', as: :docs_search
@@ -11,6 +10,9 @@
   get '/search/news/videos' => 'searches#video_news', as: :video_news_search
   get '/auth/logindotgov/callback', to: 'omniauth_callbacks#login_dot_gov'
 
+  # Deprecated
+  get '/api/search' => 'api/v1/search#search', as: :api_search
+
   namespace :api, defaults: { format: :json } do
     namespace :v1 do
       get '/agencies/search' => 'agencies#search'
diff --git a/lib/middlewares/reject_invalid_request_uri.rb b/lib/middlewares/reject_invalid_request_uri.rb
index 2380b8f2fb..4627b49ff6 100644
--- a/lib/middlewares/reject_invalid_request_uri.rb
+++ b/lib/middlewares/reject_invalid_request_uri.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class RejectInvalidRequestUri
   def initialize(app)
     @app = app
@@ -6,12 +8,12 @@ def initialize(app)
   def call(env)
     if env['REQUEST_URI']
       uri = begin
-        CGI::unescape(env['REQUEST_URI'].force_encoding('UTF-8'))
+        CGI.unescape(env['REQUEST_URI'].dup.force_encoding('UTF-8'))
       rescue ArgumentError
         nil
       end
-      return [400, { 'Content-Type' => 'text/html', 'Content-Length' => '0' }, []] if uri.nil? || (uri.is_a?(String) and !uri.valid_encoding?)
+      return [400, { 'Content-Type' => 'text/html', 'Content-Length' => '0' }, []] if uri.nil? || (uri.is_a?(String) && !uri.valid_encoding?)
     end
     @app.call(env)
   end
-end
\ No newline at end of file
+end
diff --git a/spec/controllers/api_controller_spec.rb b/spec/controllers/api_controller_spec.rb
deleted file mode 100644
index 7086899f5b..0000000000
--- a/spec/controllers/api_controller_spec.rb
+++ /dev/null
@@ -1,173 +0,0 @@
-require 'spec_helper'
-
-describe ApiController do
-  fixtures :affiliates, :users, :site_domains, :features, :whitelisted_v1_api_handles
-
-  describe '#search' do
-    let(:affiliate) { affiliates(:basic_affiliate) }
-
-    context 'when the affiliate does not exist' do
-      let(:affiliate) { mock_model(Affiliate) }
-
-      before do
-        allow(affiliate).to receive_message_chain(:active, :find_by_name).with('missingaffiliate').and_return(nil)
-        get :search, params: { affiliate: 'missingaffiliate' }
-      end
-
-      it { is_expected.to respond_with :not_found }
-    end
-
-    context 'when the affiliate is not on the v1 whitelist' do
-      before do
-        WhitelistedV1ApiHandle.delete_all
-        get :search, params: { affiliate: 'usagov' }
-      end
-
-      it { is_expected.to respond_with :not_found }
-    end
-
-    context 'when the params[:affiliate] is not a string' do
-      before { get :search, params: { affiliate: { 'foo' => 'bar' } } }
-
-      it { is_expected.to respond_with :not_found }
-    end
-
-    describe 'with format=json' do
-      let(:api_search) { double(ApiSearch, query: 'pdf', modules: [], diagnostics: {}) }
-
-      before do
-        json = { result_field: 'result' }.to_json
-        expect(ApiSearch).to receive(:new).with(hash_including(affiliate: affiliate, query: 'solar')).and_return(api_search)
-        allow(api_search).to receive(:run).and_return(json)
-        get :search,
-            params: {
-              affiliate: affiliate.name,
-              format: 'json',
-              query: 'solar'
-            }
-      end
-
-      it { is_expected.to respond_with :success }
-
-      describe 'response body' do
-        subject { JSON.parse(response.body) }
-        its(['result_field']) { should == 'result' }
-      end
-    end
-
-    context 'with format=xml' do
-      let(:api_search) { double(ApiSearch, query: 'pdf', modules: [], diagnostics: {}) }
-
-      before do
-        xml = { result_field: 'result' }.to_xml
-        expect(ApiSearch).to receive(:new).with(hash_including(affiliate: affiliate, query: 'solar')).and_return(api_search)
-        allow(api_search).to receive(:run).and_return(xml)
-        get :search, 
-            params: { 
-              affiliate: affiliate.name, 
-              format:'xml', 
-              query: 'solar' 
-            }
-      end
-
-      it { is_expected.to respond_with :success }
-
-      describe 'response body' do
-        subject { Hash.from_xml(response.body)['hash'] }
-
-        its(['result_field']) { should == 'result' }
-      end
-    end
-
-    context 'with format=html' do
-      before do
-        get :search, 
-        params: { 
-          affiliate: affiliate.name, 
-          format: :html 
-        }
-      end
-
-      it { is_expected.to respond_with :not_acceptable }
-    end
-
-    describe 'options' do
-      before :each do
-        @auth_params = { affiliate: affiliates(:basic_affiliate).name }
-      end
-
-      it 'should set the affiliate' do
-        get :search, params: @auth_params
-        expect(assigns[:search_options][:affiliate]).to eq(affiliates(:basic_affiliate))
-      end
-
-      it 'should set the query' do
-        get :search, params: @auth_params.merge(query: 'fish')
-        expect(assigns[:search_options][:query]).to eq('fish')
-      end
-
-      it 'should set the lat_lon' do
-        get :search, params: @auth_params.merge(query: 'fish', lat_lon: '37.7676,-122.5164')
-        expect(assigns[:search_options][:lat_lon]).to eq('37.7676,-122.5164')
-      end
-    end
-
-    describe 'logging searches and impressions' do
-      let(:api_search) { double(ApiSearch, query: 'pdf', modules: [], run: nil) }
-
-      before do
-        expect(ApiSearch).to receive(:new).and_return(api_search)
-      end
-
-      context "when it's web" do
-        it 'should log the impression with the :web vertical' do
-          params = {'affiliate' => affiliate.name, 'query' => 'foo', 'index' => 'web'}
-          expect(SearchImpression).to receive(:log).with(api_search, :web, hash_including(params), instance_of(ActionController::TestRequest))
-          get :search, params: params
-        end
-      end
-
-      context "when it's image" do
-        it 'should log the impression with the :image vertical' do
-          params = {'affiliate' => affiliate.name, 'query' => 'foo', 'index' => 'images'}
-          expect(SearchImpression).to receive(:log).with(api_search, :image, hash_including(params), instance_of(ActionController::TestRequest))
-          get :search, params: params
-        end
-      end
-
-      context "when it's news" do
-        it 'should log the impression with the :news vertical' do
-          params = {'affiliate' => affiliate.name, 'query' => 'foo', 'index' => 'news'}
-          expect(SearchImpression).to receive(:log).with(api_search, :news, hash_including(params), instance_of(ActionController::TestRequest))
-          get :search, params: params
-        end
-      end
-
-      context "when it's videonews" do
-        it 'should log the impression with the :news vertical' do
-          params = {'affiliate' => affiliate.name, 'query' => 'foo', 'index' => 'videonews'}
-          expect(SearchImpression).to receive(:log).with(api_search, :news, hash_including(params), instance_of(ActionController::TestRequest))
-          get :search, params: params
-        end
-      end
-
-      context "when it's document collections (docs)" do
-        it 'should log the impression with the :docs vertical' do
-          params = {'affiliate' => affiliate.name, 'query' => 'foo', 'index' => 'docs'}
-          expect(SearchImpression).to receive(:log).with(api_search, :docs, hash_including(params), instance_of(ActionController::TestRequest))
-          get :search, params: params
-        end
-      end
-
-      context "when it's undefined" do
-        it 'should log the impression with the :web vertical' do
-          params = {'affiliate' => affiliate.name, 'query' => 'foo'}
-          expect(SearchImpression).to receive(:log).with(api_search, :web, hash_including(params), instance_of(ActionController::TestRequest))
-          get :search, params: params
-        end
-      end
-    end
-
-  end
-
-end
diff --git a/spec/requests/api/v1/search_spec.rb b/spec/requests/api/v1/search_spec.rb
new file mode 100644
index 0000000000..995762da1e
--- /dev/null
+++ b/spec/requests/api/v1/search_spec.rb
@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+describe '/api/search' do
+  let(:endpoint) { '/api/search' }
+
+  before { get endpoint }
+
+  it 'returns a 404' do
+    expect(response.status).to eq 404
+  end
+
+  it 'provides a useful message' do
+    expect(response.body).to match(/This API endpoint has been deprecated/)
+  end
+end