Step 10: Submitting sample results

The online Stormwater monitoring report submittal system is under development.

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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 iswprogram.pca@state.mn.us.

Find out what you have to sample for

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:

Waivers/adjustment of hardness-dependent metals

There are various types of monitoring waivers that a Permittee may use. Waivers and adjustment for hardness dependent metals may be done through the permitting process in e-Services. 

General benchmark monitoring waiver

Permittees are not required to conduct benchmark monitoring if they document 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 the permit (see Minnesota Stormwater Manual).

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 use the Industrial Stormwater Waiver Request form:

Hardness Dependent Metals Adjustment form

The MPCA allows adjustment of benchmark values for seven hardness-dependent metals (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.