Step 10: Submitting sample results

How do I sample/monitor stormwater at my facility?

You’re complying with your sector requirements, have conducted your quarterly monitoring and now it’s time to send in quarterly sampling results using the Industrial Stormwater Permit Information Access tool. Learn about how to fill out the report as well as what to do if you exceed your sector-specific monitoring results.

Step 10a: Unable to collect a sample during your monitoring interval?

Submit a Stormwater Monitoring Report (SWMR) form for the monitoring period you were unable to collect a sample. Provide an explanation in the "If NO flow occurred during monitoring period, explain why" section and send the form to the MPCA. You may scan and email the form to

Step 10b: Download Your Stormwater Monitoring Report Forms here!

Industrial Stormwater Permit Information Access

Important note: No monitoring forms will be mailed to permittees except by request. 

Consultants, watershed districts, municipalities, and interested parties will be able to view and download: 

  • A list of all permittees and No Exposure Certifiers
  • Information by industrial sector, city/county, facility name and/or facility owner name, etc.


  • Application information
  • Facility-specific Monitoring report forms
  • Monitoring data (by facility, region, etc)

Step 10c: Read these tips for downloading and filling out the monitoring report forms

  • Less is more: enter less information to find the facility you're looking for. Better yet, search by Facility ID number if you know it.
  • Not sure of the facility name? Enter just a few letters of the facility name to populate a list.
  • No discharges leaving the facility boundary? Submitting the monitoring report form is still required. Write an explanation within the "If NO flow occurred during monitoring period, explain why" section of the monitoring report form. The Permittee is then required to collect a substitute sample during the next sampling interval. Samples may be taken at any time during an interval, except that sampling events shall be at least 72 hours apart.
  • Note: Most lab results are reported in mg/L, which is what is required on the SWMR, but sometimes the results might be in different units. Double-check what units are recorded on the lab report and convert to mg/L if necessary. See the Permit on how to submit an amended SWMR.

Step 10d: Find out what you have to sample for

Not sure of when you have to monitor or what you have to monitor for? Follow these steps:

  1. Type in the facility ID number or facility name. Click on the "search" Button.
  2. Once the results have loaded, click on that ID number in the lower left to view the "Facility Information Menu."

Is Effluent Monitoring is applicable to you? This is a once-per-year every year of the permit cycle requirement for subsectors within:

  • Sector A: Discharges from wet decking storage areas
  • Sector C: Runoff from phosphate fertilizer manufacturing facilities that comes into contact with any raw materials, finished product, by-products or waste products (SIC 2874)
  • Sector D: Runoff from asphalt emulsion facilities
  • Sector E: Runoff from material storage piles at cement manufacturing facilities (NOT Ready-Mix facilities!)
  • Sector K: Runoff from hazardous waste landfills See Sector K
  • Sector L: Runoff from non-hazardous waste landfills See Sector L
  • Sector O: Runoff from coal storage piles at steam electric generating facilities
  • Sector S: Existing and new primary airports with 1,000 or more annual jet departures that discharge wastewater associated with airfield pavement deicing that contains urea commingled with stormwater.

There are different monitoring report forms for these Permittees; they must fill out the Discharge Monitoring Report (DMR) for effluent monitoring results. These forms are available here:

Step 10e: Waivers/Adjustment of Hardness-Dependent Metals

There are various types of monitoring waivers that a Permittee may use, either to explain exceedances or to get out of monitoring requirements altogether.

General Benchmark Monitoring Waiver

Permittees are not required to conduct benchmark monitoring if the Permittee documents that one or more of the following options is being met at the facility or a portion of the facility:

  • Infiltration or Pond systems have been designed, constructed, and operated in accordance with Appendix C of the permit

Run-On Demonstration Waiver

If the average concentration of any benchmark parameter sampled over the course of a sampling year shows that a benchmark value has been exceeded and the Permittee believes that drainage onto the site from run-on has contributed to or caused the benchmark value exceedance, the Permittee can discontinue monitoring for that pollutant parameter if terms and conditions of the run-on demonstration waver are met. To qualify for the waiver, the Permittee must conduct the following activities to complete the demonstration:

  1. Sample the run-on prior to co-mingling with other stormwater discharges, and analyze the run-on against the pollutant parameter   for which the benchmark value was exceeded.
  2. Include with the SWPPP a run-on demonstration narrative that explains the nature of the run-on, a description of the neighboring property and activities, dates and lab results of the samples taken for comparison purposes, a statement that the Permittee has assessed and assured the run-on is directly affecting the specific benchmark monitoring location for which a benchmark value has been exceeded, efforts taken by the Permittee to divert/minimize run-on to the facility and other relevant information that supports the Permittee’s use of this waiver.
  3. Complete the appropriate sections of a Stormwater Monitoring Report and submit it to the Agency
  4. Address the use of this waiver in Annual Report submittals.

Natural Background Pollutant Waiver

If the average concentration of a benchmark parameter exceeds a benchmark value, and the Permittee demonstrates that the exceedance of the benchmark value is attributed to the presence of that pollutant in the natural background, the Permittee is not required to perform corrective actions or additional benchmark monitoring of that benchmark parameter provided that:

  1. The Permittee demonstrates that the average of all samples taken of a specific benchmark parameter of the natural background is contributing to and causing the benchmark value exceedance at the benchmark monitoring location.
  2. The Permittee documents and maintains with the SWPPP the supporting rationale for concluding the benchmark value exceedance are attributable to natural background pollutant levels. The Permittee shall include with the supporting rationale any previously collected data that describes the levels of natural background pollutants in the industrial facility stormwater discharge.
  3. The Permittee submits notification to the Agency by completing the appropriate sections of a Stormwater Monitoring Report that the benchmark value exceedance are attributable to natural background pollutant levels. In addition, the Permittee shall address the use of this waiver in Annual Report submittals.

If you qualify for the Benchmark Monitoring Waiver, please fill out and send in the Industrial Stormwater Waiver Request form:

Hardness Dependent Metals Adjustment form

The MPCA allows adjustment of benchmark values for seven hardness-dependent metals (i.e. cadmium, chromium +3, copper, lead, nickel, silver, and zinc) to provide flexibility in compliance with benchmark values in this permit. For any sector required to conduct benchmark monitoring for a hardness-dependent metal, the agency includes “hardness ranges” from which benchmark values can be determined.

Fill out the Microsoft Office document icon Adjusted Benchmarks for Hardness Dependent Metals Form