If you use assistive technology (such as a screen reader) and need a
version of this document in a more accessible format, please email firstname.lastname@example.org.
Please tell us what format you need. It will help us if you say what assistive technology you use.
Pollution Prevention Guidance 4 (PPG4) provides advice to domestic properties on choosing, installing and maintaining septic tanks, package treatment plants and drainage fields, where no foul sewer is available for use.