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RI Pollutant Discharge Elimination System (RIPDES)

This is the backbone of the state's water pollution control strategy, which includes developing & enforcing permit limitations for municipal and industrial wastewaters, storm water, & combined sewer overflows discharged directly to the waters of the state, as well as industrial wastewaters discharged to municipally-owned treatment facilities. The program currently oversees permit compliance for 23 major discharges, approximately 70 minor discharges, & approximately 250 storm water discharges. The Pretreatment Program provides ongoing oversight of fifteen approved local pretreatment programs.

In accordance with the EPA Federal and RI Pretreatment Regulations, the 15 RIDEM-approved Industrial Pretreatment Programs regulate almost 200 Significant Industrial Users (SIUs) and thousands of Non-Significant Industrial Users. Over half of the state’s SIUs are subject to EPA Federal Categorical Pretreatment Standards.

For more information on RIDEM’s Industrial Pretreatment Program, please contact Robert DiSaia at 401-222-4700, x-7228.






Subscribe to the RIPDES Program permit actions Public Notice E-mail List:
The Office of Water Resources (OWR) has created an e-mail list in which one can be added to receive notice of RIPDES permit actions via email. After subscribing you will receive an email with links to all future public notices of draft permit actions and the draft permit(s). You can subscribe by visiting the user-friendly webpage at If you have difficulty subscribing or have other questions, email

For more information regarding the E-Mail list only, contact Traci Pena. For additional information regarding specific permit actions, please direct all inquiries to the contact listed on the public notice.