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The Regional Haze Rule requires states to improve visibility in our nation's national parks and wildernesses (Class I areas) and restore them to natural visibility conditions by 2064.

The MPCA had approximately $135,000 in grant funding to help Minnesota businesses and organizations purchase bicycles and electric-assisted bicycles (e-bikes) for commercial use.

The MPCA studies, monitors, and regulates many land pollutants that affect the quality of life in Minnesota and the health of residents.

For more than 50 years, volunteers have gathered critically important water clarity data on Minnesota lakes and streams.

Particulate matter (PM) refers to various air particles, including dust, soot, smoke, and liquid droplets that range in size from less than 0.1 microns in diameter (smaller than a single bacterium)…

From the days when raw sewage flowed into rivers and lakes, Minnesota’s water bodies have come a long way. However, there is still work to be done in the restoration and protection of our waters.

Controlling phosphorus is an important part of protecting Minnesota waters.

Nitrogen management plans help operators of wastewater treatment facilities understand the inputs of nitrogen to their facilities and evaluate options that can reduce the amount of nitrogen discharged.

Proposed changes to permits that regulate the state’s largest animal feedlots target nitrate pollution statewide.

The Floristic Quality Assessment (FQA) is a vegetation-based ecological assessment approach that can be used for wetland quality monitoring and assessment.

Septic tanks must be registered in Minnesota to ensure they are watertight and have adequate structural integrity.

The MPCA has released the draft 2025 Minnesota Nutrient Reduction Strategy for public review and comment.

Minnesota’s policy is to eliminate or reduce the use, generation, and release of toxic pollutants and hazardous wastes at their source.

MagIron LLC proposes to restart a mining and processing facility near Grand Rapids, which will require new air and industrial wastewater permits from the MPCA.

Chemicals in the air toxics emission inventory.

Although the impacts from Minnesota’s changing climate are touching all of us, some groups of people are more at risk.

Phosphorus management plans help wastewater treatment facility operators and managers evaluate pollution prevention and and management options that can reduce the amount of phosphorus discharged to Minnesota waters.

Elevated levels of tetrachloroethylene and trichloroethylene have been found in soil vapor around this site in St. Paul.

Agropur Inc., doing business as Le Sueur Cheese Company, land applied too much industrial byproduct, resulting in rates of nitrogen and phosphorus that exceeded the allowed limits by more than 10 percent. The violations occurred in 2022, near its cheese production facility in Le Sueur, Minnesota.

DENCO II LLC failed a stack test in April, 2024, that showed that the facility exceeded its permit limit for particulate matter by more than 170%.