The Department of Environmental Quality’s (DEQ’s) OKR05 permit is required for stormwater discharges associated with industrial activities under certain standard industrial classification (SIC) codes.  The SIC codes and sectors that are covered can be found in Table 1-2 of the OKR05 permit.

The OKR05 permit does not include the discharges from industrial activity which are related to oil and gas extraction, agricultural purposes, or located in Indian Country lands.  Obtaining OKR05 coverage fulfills your permit requirements on the state level; local municipalities are separate entities and may have different permit requirements.

OKR05 permitting procedures:

  1. First familiarize yourself with all the requirements in the OKR05 permit and develop a stormwater pollution prevention plan (SWP3) for your project.
  2. Complete a notice of intent (NOI) and return it to the DEQ along with your permit fees.
    • The DEQ’s Flex Viewer can be used to find the nearest water body.
    • If your facility prevents rain, snow, snowmelt, and/or runoff from being exposed to industrial materials and activities, you may apply for a no exposure certification.
  3. You will be notified by DEQ if more information is required.  Once you receive your authorization you may begin discharging stormwater associated with industrial activities.  Your OKR05 permit does not cover any stormwater discharges that occur before your permit is issued.  While in operation, be sure you are following all the inspection, maintenance, training, and monitoring requirements as discussed in OKR05.
  4. In order to terminate coverage under OKR05, you must complete a notice of termination (NOT) and return it to the DEQ.  DEQ will conduct an inspection to ensure that closure requirements have been met. If your site is in compliance, you will receive notification stating that your authorization is terminated.  You will also receive notification if you have not met the stabilization requirements and your authorization will remain open.You may terminate coverage under your OKR05 by permit if one or more of the following conditions have been met:
    • A new owner/operator has assumed responsibility for the facility;
    • You have ceased operations at the facility and there no longer are discharges of storm water associated with industrial activity from the facility;
    • You have obtained coverage under an individual or alternative general permit for all discharges required to be covered by an OPDES permit.

The EPA provides an industrial SWP3 development guide.  DEQ has also developed SWP3 templates and guidelines which can be downloaded here.