Skip to Main navigation Skip to Left navigation Skip to Main content Skip to Footer

University of Minnesota Extension

Extension > Agriculture > Dairy Extension > Manure > Milk house wastewater and clean air regulations

Print Icon Email Icon Share Icon

Milk house wastewater and clean air regulations

Kevin Janni, Professor & Extension Engineer

Where does your milk house wastewater go?




  • Down the drain into a tile line?
  • Manure storage unit
  • To a wetland or ditch?
  • Wastewater treatment system
  • Land application

MPCA 7020 Rules



Treatment options

Carver & Wright Co.


Water use - 3 to 9 gal/day-cow
Organic load (BOD5) - 490 to 3,100 mg/L

Systems cannot treat waste milk

Scum after 5 weeks:

Bark bed / strips


Aerobic Systems

Reduce organic loading but not to discharge limit (25 mg/L BOD5)

Winona & Goodhue Co.

Producers can


Cooperating dairy producers:

Clean Air Regulations

Air Quality Issues

EPA Clean Air Act
MN Air Emissions
EPA Emissions reporting
EPA – Animal Agriculture consent agreement

EPA Clean Air Act

NAAQS: primary standards

San Joaquin Valley

Issues & Controversy


MN Air Permits

EPA Emissions Reporting


Will MN dairy producers need to comply with CERCLA and EPCRA reporting rules?

Probably yes.

What herd size is expected to require CERCLA and EPCRA reporting?

Emissions Data Lacking

Failure to comply

EPA – Animal Agriculture

Consent Agreement

Should the dairy industry get involved in the Consent Agreement to develop emissions data?

Emissions research

Clean air regulations will impact dairy industry

More Information

U.S. Environmental Protection Agency
Minnesota Pollution Control Agency
Pro dairy facilities-Cornell University
Western United Dairymen


  • © Regents of the University of Minnesota. All rights reserved.
  • The University of Minnesota is an equal opportunity educator and employer. Privacy