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Thermal Discharges
National Summary
A common water quality standard that must be met when discharging wastewater into surface waters is the temperature of the discharged effluent. The NPDES permit program generally requires monitoring the temperature and flow of the discharged water, both as an effluent characteristic during the application process and as a temperature limitation under the permit conditions. Thermal pollution is defined as heated water discharges with the potential to alter the growth and existence of aquatic organisms.
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TypeTitleDateState
Proposed Regulations 40 CFR 122 and 125 - National Pollutant Discharge Elimination System--Cooling Water Intake Structures at Existing Facilities and Phase I Facilities 07/20/2011National
Final Regulations 40 CFR 122 and 125 - National Pollutant Discharge Elimination System--Suspension of Regulations Establishing Requirements for Cooling Water Intake Structures at Phase II Existing Facilities 07/09/2007National
Proposed Regulations 40 CFR 122, 123, 124, and 125 - National Pollutant Discharge Elimination System--Proposed Regulations to Establish Requirements for Cooling Water Intake Structures at Existing Facilities; Notice of Data Availability Related to Impingement Mortality C 06/11/2012National
Notices Agency Information Collection Activities; Cooling Water Intake Structure Phase II Existing Facilities (Renewal) 05/29/2007National
Notices Agency Information Collection Activities; Cooling Water Intake Structure Phase II Existing Facilities (Renewal) 08/27/2010National
Notices Agency Information Collection Activities; Cooling Water Intake Structures New Facility (Renewal) 12/23/2011National
Notices Agency Information Collection Activities; Existing Facilities Cooling Water Intake Structures 01/21/2011National
Notices Agency Information Collection Activities; Information Collection Request for Cooling Water Intake Structure Phase II Existing Facilities 03/01/2007National
Notices Agency Information Collection Activities; Information Collection Request for Cooling Water Intake Structure Phase II Existing Facilities (Renewal) 06/21/2010National
Notices Agency Information Collection Activities; Information Collection Request for Cooling Water Intake Structures?New Facility 03/02/2005National
Notices Agency Information Collection Activities; Submission to OMB for Review and Approval; Cooling Water Intake Structure Phase II Existing Facilities, Cooling Water Intake Structures at Phase III Facilities, and NPDES Animal Sectors 01/16/2014National
Notices Agency Information Collection Activities; Willingness to Pay Survey for Section 316(b) Existing Facilities Cooling Water Intake Structures (New) 07/21/2010National
Notices Agency Information Collection Activities; Willingness to Pay Survey: Phase III Cooling Water Intake Structures 03/24/2005National
Guidance Documents EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards  National
Guidance Documents Establishing TMDLs in Light of the Decision by the U.S. Court of Appeals for the D.C. Circuit in Friends of the Earth v. EPA  National
Forms Industry Short Technical Questionnaire: Phase II Cooling Water Intake Structures  National
Notices Information Collection Request for Cooling Water Intake Structures New Facility Final Rule (Renewal) 03/28/2008National
Notices Notice of Availability of Draft NPDES General Permits for Noncontact Cooling Water Discharges in Massachusetts and New Hampshire 07/06/2007National
Guidance Documents NPDES Permit for the Brayton Point Station  National
Regulatory Analysis Thermal Discharges  National