With record rainfalls increasing pressure on water resource recovery facilities, the debate on peak flow blending in separate sanitary sewer systems lingers.

What is blending and what is it not?

Blending is not bypass. Bypass is the unpermitted, intentional diversion of waste streams from any portion of treatment facility and direct discharge of those streams to the environment. Bypass is prohibited unless unavoidable to prevent loss of life, personal injury, severe property damage...