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2018 Construction stormwater general permit in effect

Posted By MNLA eNews, Tuesday, November 6, 2018

The MPCA issued the 2018 NPDES/SDS General Construction Stormwater permit on August 1, 2018; see the Construction stormwater web page for complete details. Anyone submitting an application after August 1 will be covered under the revised permit. Those currently covered under the 2013 permit can continue to follow it until the project is complete, but must update their SWPPP to reflect the new requirements if the project continues past February 2020. There is no need to reapply for permit coverage.

What’s new?

The permit has a new, easier-to-read format with fewer pages. The requirements have not altered significantly; notable changes include:

  • Permittees no longer need to wait seven days for permit coverage on projects that don't require review. Coverage is effective once payment is received.   
  • Permittees will receive a copy of the permit instead of a coverage card after application.
  • The definition for “contractor” on the application has been clarified to mean the general contractor with operational control over the entire project on behalf of the owner, and not a subcontractor.
  • Permittees must first consider a volume-reduction practice, such as infiltration, for permanent stormwater treatment. The permit also clarifies that wet sediment basins and filtration systems are not volume-reduction practices.
  • Testing is required on the site of a permanent stormwater system to verify whether infiltration is prohibited for one of the reasons in the permit.
  • The permit clarifies that redundant sediment controls installed near surface waters need to be spaced five feet apart, and that sediment controls must be installed at the base of soil piles.

A full description of changes to the permit can be found here.

Tags:  irrigation  MPCA  permiting  stormwater management  water management 

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MN Stormwater News

Posted By MNLA eNews, Friday, July 21, 2017
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MPCA Seeks Early Feedback on Proposed Permit Changes for the NPDES Construction Program

Posted By MNLA eNews, Sunday, June 18, 2017

When stormwater drains off a construction site, it carries sediment and other pollutants that harm lakes, streams, and wetlands. The U.S. Environmental Protection Agency estimates that 20 to 150 tons of soil per acre are lost every year to stormwater runoff from construction sites. Controlling erosion can significantly reduce the amount of sediment and other pollutants transported by runoff from construction sites. To keep Minnesota’s valuable water resources clean, the MPCA issues National Pollutant Discharge Elimination System Permits for Construction Activity to prevent stormwater pollution during and after construction.

Although the current construction permit is not scheduled to expire until August of 2018, the MPCA intends on re-issuing the permit as soon as fall of 2017. The expiration date coincides with the expiration of the Municipal Separate Storm Sewer System (MS4) Permit and the MPCA is concerned about having multiple general permits expiring on the same schedule due to limited staff resources. Additionally, the MPCA will not be proposing major changes in the draft permit.

Although no major permit changes will be proposed, several minor changes are needed as brought forward by both external stakeholders and MPCA staff. The MPCA is seeking early input on some of these changes for the permit. This is not the official public comment period and the MPCA will not be providing formal responses to all of the input received. The MPCA will use the information provided to compose the requirements to publish in the draft permit for the public notice. The official public comment period is tentatively scheduled for the summer of 2017.

The MPCA is encouraging all interested parties to review and provide feedback on some of the proposed changes. Please follow this link to participate:

Tags:  erosion control  irrigation  MPCA  stormwatermanagement  water management 

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MPCA’s plans for the Stormwater Manual

Posted By MNLA eNews, Thursday, June 23, 2016
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Minimal Impact Design Standards (MIDS) - What a difference two years makes!

Posted By MNLA eNews, Wednesday, December 23, 2015

From Minnesota Pollution Control Agency Weekly Digest Bulletin

Since the MIDS project was completed two years ago, several entities using the work products shared their uses and successes at the Water Resources conference held on October 14, 2015 at the St. Paul RiverCentre.

  • John Hanson, Valley Branch Watershed District Administrator, presented on how the District is using the MIDS performance goals. Valley Branch is the first organization to adopt the MIDS performance goals.
  • Representing the city of Blaine, a regulated MS4, Jim Hafner said the city has adopted MIDS to meet their MS4 requirements and that the city, along with the two watershed districts they are in, use the MIDS calculator for all new projects.
  • Mike Isensee, from the Middle St. Croix Water Management Organization, announced they had received a Clean Water Land and Legacy grant to work with up to 10 communities in the watershed to adopt MIDS.
  • Michele Wigern, speaking on behalf of the Fairbault Soil and Water Conservation District, said the District uses the MIDS calculator and best management practices in the stormwater manual for guidance and grant applications.
  • Jay Michels, a consultant representing Emmons and Olivier, said the organization has taken MIDS on the road to other states and to Canada.
  • MIDS was also recently included in the Environmental Quality Board's Water Policy Report. Goal 2 of the report is to manage our built environment to protect water and includes adoption of the MIDS work products as the system change that is needed to manage runoff.

Find out how other watershed districts, watershed management organizations and cities have adopted MIDS in various ways on the Community Assistance page.

If you have adopted MIDS into your programs, please contact Anne Gelbmann ( and your organization will be listed in the stormwater manual.

Tags:  irrigation  MIDS  minimal impact design standards  MPCA  stormwater management  sustainability  water management 

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What's new in the Stormwater Manual?

Posted By MNLA eNews, Monday, June 15, 2015

The MPCA summarizes the changes made in recent months to the Minnesota Stormwater Manual:

We have added a new page called In the News. You can find it in the left toolbar in the manual wiki.

Several pages (forms, guidance and examples) have been created for the TMDL Reporting Form. This form must be submitted by MS4 permittees that have TMDL Wasteload Allocation requirements approved by the U.S. EPA prior to August 1, 2013. See Forms and guidance for TMDLs.

Technical updates

  • When designing an infiltration practice, use the lowest permeability unit within 5 feet of the bottom of the practice or, if the separation distance is less than 5 feet, the lowest permeability unit within that separation distance.
  • For large sites, the recommended number of permeameter tests can be very large. The number of tests may be reduced under certain conditions. One method to determine the number of samples is to plot standard deviation versus sample number. At a point where the curve flattens, infiltration testing may be halted. A minimum of 5 samples is recommended. For more information, see the NOTE in [2].
  • A literature review of bacteria removal in filtration practices shows the removal percentages in the original manual were too high, particularly for vegetated practices. Removal percentages in the original manual were 70 percent for both media and vegetated filters. The values have been updated to 50 percent for media filters and 0 percent for vegetated practices. We anticipate conducting a more thorough literature review in the future to clarify these values.

New pages

NOTE: A street sweeping spreadsheet calculator tool, developed by Kalinosky et al. (2013) and referenced on the street sweeping section of the manual is now available.

Tags:  irrigation  MPCA  stormwater management  water management 

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Miminal Impact Design Standards (MIDS) Calculator-New Version is Now Available

Posted By MNLA eNews, Thursday, August 21, 2014

A new version of the MIDS Calculator is now available in the Minnesota Stormwater Manual. Changes over the last 6 months include:

  • Tree trench/box credits for canopy interception and evapotranspiration
  • Bioretention with underdrain updated to apply the equation for phosphorus credit reduction based on media depth.
  • Summary table of total phosphorus and total suspended solids percent removal by BMP on the summary tab of the calculator
  • Annual runoff volumes to BMP summary tab was added
  • Bioretention media phosphurus credits to tree box/infiltration trench with underdrain
  • Bioretention medial phosphorus credits to swale with underdrain was added
  • Sizing inputs for stormwater ponds
  • Swale annual TSS, dissolved phosphorus and particulate phosphorus removals were adjusted
  • A stormwater reuse function!

A few other minor updates were also made. You can now download this new version of the calculator. Remember to delete your current version before downloading the new version. Here's the link to download the calculator:


Please let me know if you have questions or comments.


Anne Gelbmann

Green Infrastructure Coordinator

MPCA/Municipal Stormwater Section

Tags:  irrigation  MIDS  minimal impact design standards  MPCA  stormwater management  water management 

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MN’s New Stormwater Crediting System for Trees

Posted By MNLA eNews, Friday, July 25, 2014
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MIDS Community Assistance Package and other Post Construction Guidance for Regulated MS4s

Posted By MNLA eNews, Thursday, June 19, 2014

Stormwater Professionals:

The MPCA would like to make you aware of two documents that have been placed on the MPCA Stormwater Web page to assist communities with the development of their post-construction stormwater management program.


The Minimal Impact Design Standards (MIDS) Community Assistance Package (CAP) contains ordinance guidance that will help communities who wish to implement MIDS.  The CAP can be found in the Minnesota Stormwater Manual:


The second document is entitled “Technical Support Document for the Post-Construction Stormwater Management Conditions in the General Stormwater Permit (MNR040000) for Small Municipal Separate Storm Sewer Systems (MS4s)”. This guidance document is intended to help those communities that are regulated by the MS4 Permit to understand the options available for complying with the post construction stormwater management permit conditions (MCM 5). This document can be found at the following link:


These documents can also be found on the MPCA MS4 Webpage under the Post Construction Stormwater Management section on the Guidance and BMPs tab.


Question concerning these documents can be directed to Scott Fox at 651-757-2368 ( or Anne Gelbmann at 651-757-2384 (


Tags:  irrigation  MIDS  minimal impact design standards  MPCA  stormwater management  water management 

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