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On July 1, 2018, the Iowa DNR issued a new general permit to authorize discharges from the following activities:
General Permit 9 (GP9) was reissued on July 1, 2023.
GP9 covers dewatering discharges to surface waters of the state and to the ground surface. Discharges from geothermal systems that do not reach navigable waters are already exempted by rule from obtaining operation permits. Therefore, only discharges to navigable waters from residential geothermal systems are authorized by GP9.
Please use the links below to view General Permit 9 and documents intended to assist you in navigating the general permit requirements.
General Permit 9 – effective July 1, 2023
Several documents have been developed to help people determine what permit requirements are applicable in a given situation.
Most permittees will be automatically covered under GP9. However, some permittees will need to submit an electronic Notice of Intent for Coverage (eNOI). To determine if you need to submit an eNOI, please refer to the documents linked above. If you need to submit an eNOI, please proceed to the NPDES Databases page.
A few permittees will need to complete an Antidegradation Document as part of the the electronic Notice of Intent. For more information on the antidegradation requirements, please see the Water Quality Standards Antidegradation page.
What GP9 does:
For more information on this permit, contact Wendy Hieb at firstname.lastname@example.org or 515-808-3039.
Surface Water Standards: Iowa DNR Water Quality Standards:567 IAC Chapter 61
Groundwater Standards: Statewide Standards for Contaminants in Soil and Groundwater:DNR Cumulative Risk Calculator
Definition of Waters of the United States.
Map of Outstanding Iowa Waters.
Link to Iowa DNR's Facility Explorer.