EPA plans to update regulations on wastewater blending during wet weather

Agency will reach out to stakeholders for feedback

Posted April 19, 2018

EPA intends to begin the rulemaking process for the use of “blending” by wastewater treatment plants during wet weather events. Blending refers to the practice of routing excess water from the wastewater collection system around the biological (sewage) treatment unit and then blending it back in with secondary treatment effluent for disinfection prior to discharge. The practice allows a wastewater treatment plant to avoid a possible shutdown or damage.

The Agency says the new rule is needed to give municipalities clarity and certainty on the use of blending so that their wastewater treatment plants can optimize wastewater treatment during wet weather.

EPA plans to hold stakeholder outreach activities during the coming months for information and feedback before issuing the proposed rulemaking.


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