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In addition to addressing direct discharges of pollutants to water, the Clean Water Act established the National Pretreatment Program to address indirect discharges, meaning discharges from industrial and commercial sources to publicly owned treatment works (POTWs). The National Pretreatment Program requires industrial and commercial dischargers to obtain permits or other control mechanisms to discharge wastewater to a POTW. For more information, see the national pretreatment page.
Public Comment Opportunities
For current approval and compliance actions open for public comments see Public Comment Opportunities in Region 10.
Rules and Guidance
General Preteatment Regulations
The General Pretreatment Regulations for Existing and New Sources of Pollution appear at 40 CFR Part 403 (PDF).
For more information, see the national pretreatment page.
- In 2005, the EPA finalized significant changes to the pretreatment regulations, called the "Streamlining Rule."
Categorical pretreatment standards specify the quantity, concentration, or pollutant properties of pollutants that may be discharged to POTWs for specific industry categories. They include standards for existing sources (PSES) and new sources (PSNS).
EPA Region 10 Pretreatment Guidance