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- ATTENTION -
All storm water general permit applications (NOIs) must be accompanied by the following fees:
1 year - $175.00 3 years - $350.00 4 years - $525.00 5 years - $700.00
Storm water general permit applications (NOIs) may be submitted online at:
Online Storm Water General Permit Database
There are three general classes of activities that must be covered by storm water permits. These are:
Please note, any discharge from a facility or construction site that may temporarily degrade an Outstanding National Resource Water or Outstanding State Resource Water is required to be permitted by an individual NPDES permit, as stipulated in 567 Chapter 64 of the Iowa Administrative Code and in the Iowa Antidegradation Implementation Procedure. General permit coverage is not available for these discharges. The list of these waters is located in Appendix B of the Antidegradation Implementation Procedure.
Construction activity that disturbs one or more acres must be covered by a storm water permit before any soil is disturbed at the site. Construction activities are covered under General Permit No. 2 (GP #2). The following guidelines apply to coverage under GP #2:
To apply for coverage under GP #2, use the Online Storm Water General Permit Database.
Paper application forms (Notices of Intent) and information may also be found on the Permits, Guidance, and Forms webpage.
Industrial and commercial activities that are classified as having "storm water discharge associated with industrial activity" are required to obtain permit coverage. EPA's definition of "storm water discharge associated with industrial activity" from 40 CFR 122.26 and in Iowa Administrative Code 567 IAC Chapter 60 can be found at this link: Definition - Storm Water Discharge.
Most industrial activities are covered under General Permit No. 1 (GP #1) or by individual permits.
Facilities such as asphalt plants, concrete batch plants, quarries, sand and gravel pits, and rock crushers are covered under General Permit No. 3 (GP #3).
A summary of the types of industrial facilities and activities subject to the regulations are provided in Table 1, "Facilities or Activities Defined as Industrial Activities Subject to Storm Water Discharge Application Requirements".
To apply for coverage under GP #1 or GP #3, use the Online Storm Water General Permit Database.
If all industrial materials and activities at your facility are protected by a storm resistant shelter that prevents exposure to rain, snow, snowmelt, and/or runoff, you may not need a storm water permit. Industrial materials or activities include, but are not limited to,
To qualify for a no exposure exemption, complete and submit the No Exposure Certification Form. A No-Exposure Certification must be provided for each qualifying facility.
The no exposure exemption is ONLY available on a facility-wide basis; it is not for individual outfalls. If any industrial activities or materials at your facility are exposed to precipitation, the facility is not eligible for the exemption.
Many cities and universities in Iowa are required to have individual NPDES permits for their Municipal Separate Storm Sewer Systems (MS4s). The determination of which cities and universities are required to obtain individual MS4 permits involves a combination of population, proximity to large, urbanized areas, and the water quality of receiving streams. MS4 permits require permittees to implement measures to:
Please refer to the MS4 Permittees webpage (linked above) for a list of MS4 permit holders in Iowa.
For coverage under a general storm water discharge permit, a complete Notice of Intent (NOI) must be submitted to DNR and an authorization approved and issued by the Department prior to the start of operations or soil disturbing activities, as specified in 567-64.3(4)"b" of the Iowa Administrative Code.
For an individual NPDES permit, an application must be submitted 180 days prior to the start of operation.
Please see the Application Options & Fees page for more information.