Foul drainage assessment form (FDA1)

This form may be used as part of a planning application that incorporates a proposed non-mains foul drainage system.


FDA1 Foul drainage assessment form

This file may not be suitable for users of assistive technology. Request an accessible format.

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email Please tell us what format you need. It will help us if you say what assistive technology you use.


This document helps local planning authorities when they are considering a planning application that involves non-mains drainage.

Completion of this form and its submission with your planning application will help to identify:

  • any concerns that might lead to pollution or nuisance arising from a non-mains drainage system
  • a need for significant changes to a developer’s intended foul drainage arrangements
  • an application for an environmental permit being refused, or particularly stringent conditions imposed
Published 25 August 2011
Last updated 30 August 2017 + show all updates
  1. Updated Foul drainage assessment form.
  2. First published.