Idaho Stormwater-Municipalities regulations & environmental compliance analysis

Idaho Stormwater-Municipalities: What you need to know

Governing Law and Regulations

National Pollutant Discharge Elimination System (NPDES) permit program: Idaho Rules of Administrative Procedures 58.01.02.400

Regulatory Agencies
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U.S. Environmental Protection Agency (EPA) Region 10

Idaho Department of Environmental Quality (DEQ) Water Quality Division

Comparison: State vs. Federal

· Rules. Idaho received authorization from the U.S. Environmental Protection Agency (EPA) to administer the federal National Pollutant Discharge Elimination System (NPDES) permit program, which includes stormwater discharges, on June 5, 2018. The transfer of the administration of specific program components from the EPA to the Idaho Department of Environmental Quality (DEQ) will take place over a 4-year period, with the DEQ assuming responsibility for general and individual stormwater permits on July 1, 2021. The EPA will retain the authority to issue NPDES permits for facilities located on tribal lands and/or discharging to tribal waters.

See the national section STORMWATER—MUNICIPALITIES for a review of the federal municipal separate storm sewer system (MS4) stormwater permitting program.

· Administration and enforcement. Until July 1, 2021, EPA Region 10 is responsible for the administration and enforcement of the stormwater discharge NPDES permit rules in Idaho. Currently, the DEQ assists the EPA with some regulatory issues in certain cases and provides technical assistance and support for controlling stormwater in Idaho, including plan and specification review for facilities that control, treat, or dispose of stormwater.

Although Idaho does not have state-specific requirements for stormwater control and pollutant removal at this time, there are regional and municipal regulations in place. To ...


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