Guidance

Waste water treatment works: treatment, monitoring and compliance limits

Find out the compliance limits for waste water treatment works (WWTW), and how to treat and monitor discharges to meet permit conditions.

• From: Environment Agency
• Published: 8 May 2018
• Last updated: 17 January 2019 — See all updates

Documents

Waste water treatment works: treatment monitoring and compliance limits

Ref: LIT 10945

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Details

This guide is for operators of WWTW with environmental permits for water discharge activities or point source groundwater activities.

WWTW collect and treat sewage. This guide explains the:

• level of treatment WWTW must provide
• numeric compliance limits that define the treatment’s effectiveness
• monitoring and reporting required to assess compliance with the limits

This guide sets out what you need to do to meet the requirements of the Urban Waste Water Treatment Regulations.

Published 8 May 2018
Last updated 17 January 2019 + show all updates

1. 17 January 2019

   Updated the population equivalent compliance section. The population equivalent (PE) of an area served by a waste water treatment works (WWTW) represents the highest biochemical oxygen demand (BOD) load that enters the WWTW.

2. 8 May 2018

   First published.