The Pretreatment Standards for Existing Sources (PSES) are designed for which group?

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Multiple Choice

The Pretreatment Standards for Existing Sources (PSES) are designed for which group?

PSES are the pretreatment limits that apply to existing indirect dischargers—industrial users that were already discharging to a POTW before regulatory dates. The goal is to curb the pollutants entering the wastewater treatment system from those established dischargers, protecting the POTW and downstream water quality. New indirect dischargers, by contrast, would be governed by pretreatment standards for new sources, which are designed for facilities starting discharges after the regulatory date. Priority pollutants are a list of regulated contaminants, not a classification of which group the standards target, and “129 entries” isn’t a descriptor of discharger groups. So the correct focus is that PSES are designed for existing indirect dischargers.

PSES are the pretreatment limits that apply to existing indirect dischargers—industrial users that were already discharging to a POTW before regulatory dates. The goal is to curb the pollutants entering the wastewater treatment system from those established dischargers, protecting the POTW and downstream water quality. New indirect dischargers, by contrast, would be governed by pretreatment standards for new sources, which are designed for facilities starting discharges after the regulatory date. Priority pollutants are a list of regulated contaminants, not a classification of which group the standards target, and “129 entries” isn’t a descriptor of discharger groups. So the correct focus is that PSES are designed for existing indirect dischargers.

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