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These Regulations give the minimum requirements for the treatment of significant sewage discharges. 

These requirements provide protection for water bodies against the adverse impacts from nutrient substances present in sewage (specifically compounds of nitrogen and phosphorus).  

Under the Regulations, the �ʶ����� Ministers must review environmental waters every four years to determine if they are sensitive to the effects of sewage discharges.

If they are, the environmental waters must be identified as “sensitive areas” in accordance with the Regulations, and nutrient reduction must be provided at relevant sewage plants.  

monitors discharges from waste water treatment plants against the Regulations treatment standards.

Notice, schedule and map

Following the latest review of environmental waters we have issued a Notice, schedule and map to Natural Resources Wales.

These documents identify new sensitive areas where Natural Resources Wales are required to monitor the discharges to environmental waters from waste water treatment plants.