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ECO-3       Protecting Our Soil, Water & Air

Certified Erosion & Sediment Control Lead (CESCL) Training & Site Supervision

EPA Stormwater Requirements in the State of Idaho

EPA Construction General Permit (CGP) Section 9

Synopsys: If you are doing a project clearing more than one (1) acre you must apply directly to the  EPA for a Construction General Permit (CGP).  Application can be made using EPA e-noi (electronic notice of intent stormwater application  Section 9.1 outline the overlay of the oversight between EPA & Idaho Department of Environmental Quality

Basic Requirement:  EPA has permit & oversight on the project, DEC may have additional requirements for inspection and Stormwater Pollution Prevention Planning (SWPPP).  

1. IDR100000: The State of Idaho, except Indian country

 a. Any construction related storm water discharges to impaired water bodies on Idaho’s Clean Water Act (CWA) Section 303(d) list with EPA-approved Total Maximum Daily Loads (TMDL) must be consistent with any load allocations established by the applicable TMDL.

 b. No net increase of listed pollutants is allowed in any construction related storm water discharges to an impaired water body considered “high priority” as included on Idaho’s CWA Section 303(d) list that does not yet have an EPA-approved TMDL.

 c. If a TMDL has not been established for an impaired water body considered “medium priority” or “low priority” as included on Idaho’s CWA Section 303(d) list, BMPs shall be employed as necessary to prohibit further impairment of the designated or existing beneficial uses.

 d. Only BMPs authorized by the appropriate designated agency as defined in the Idaho Water Quality Standards and Wastewater Treatment Requirements (IDAPA 58.01.02 et seq.), or otherwise approved by the Idaho Department of Environmental Quality, will be allowed.

 e. Use of the “Equivalent Analysis Waiver” in Addendum D is not authorized.

 f. Operators may contact the Idaho Department of Environmental Quality regional office nearest the construction activity for more information about impaired waterways:

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