The Iowa Department of Natural Resources (DNR) has proposed two general discharge permits to cover two types of common and generally low risk discharges.

DNR plans to issue two new National Pollutant Discharge Elimination System (NPDES) general permits known as General Permit #8 (GP8) and General Permit #9 (GP9). GP8 allows for discharges of hydrostatic test water (water used to test the integrity of a pipe or tank), underground storage tank ballast water (water used to weight a tank to facilitate underground installation), and water associated with installation, repair, and replacement of potable water lines. GP9 allows for discharges from dewatering associated with construction and small residential geothermal heating and cooling systems.

IDNR is proposing to include eligibility criteria and Best Management Practices. These will ensure that discharges will comply with water quality standards. Most permittees will be automatically authorized to discharge. Only a few higher-risk dischargers will need to submit a Notice of Intent. There is no fee for either permit.

DNR is seeking public comment on proposed rules that will create two new general permits. DNR will hold three public hearings across the state in March:

  • Wednesday, Mar. 7, 4 p.m. at the Coralville, IA Public Library
  • Thursday, Mar. 8, 4 p.m. at the Harlan, IA Public Library
  • Wednesday, Mar. 14, 4 p.m. at the Urbandale, IA Public Library


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