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Nitrogen, like phosphorus, is a nutrient that pollutes in state waters, and its concentration in many rivers has been increasing from historic natural levels over time due to human influences.…

A training and certification program for evaluating aquatic life in Minnesota’s rivers and streams.

Residential wood burning has been increasing in Minnesota, both for home heating and recreation.

To reduce the pollution that causes climate change, Minnesota has set goals to cut our collective greenhouse gas (GHG) emissions and track progress.

Where possible, permit holders must use MPCA's e-Services to apply for reissuance and administrative amendments.

One indicator of impairment that puts a stream on the Impaired Waters List is its macroinvertebrate population. Here's how that works.

MPCA's recommended review criteria for wastewater treatment facilities that need to perform system maintenance that requires approval to bypass untreated or partially treated domestic wastewater.

Pretreatment by commercial facilities and other non-domestic wastewater sources removes harmful pollutants before the wastewater is discharged to a municipal sewer system. The U.S. EPA has delegated MPCA the authority to approve pretreatment programs at the local level and oversee statewide pretreatment activities.

The MPCA and its many partners collect a wide variety of data on environmental conditions and pollution sources.

Green and safer product chemistry is formulating or designing a new product (or reformulating an existing one) to reduce harmful environmental, workplace, human health, and energy use effects over the product's entire life cycle.

Wastewater treatment and disposal are important for protecting and preserving Minnesota's water resources. MPCA regulates wastewater treatment activities in Minnesota.

MPCA completed 100 enforcement cases for water quality, air quality, waste, stormwater, and wastewater violations in the first half of 2024

Data shows that ice cover on Minnesota's lakes doesn't last as long as it used to. That means a shorter ice fishing season, yes, but it also has implications for the environment and Minnesota's fish and wildlife.

Air quality dispersion modeling uses a computer model to estimate air pollution concentrations from regulated facilities and other sources of pollution.

Starting Jan. 1, 2025, the first prohibitions of products containing intentionally added PFAS took effect in Minnesota.

A cumulative impacts analysis provides a comprehensive look at all burdens that affect a community or neighborhood.

Addressing excess nutrient levels in Lake Pepin based on the site-specific water quality eutrophication criteria for the lake developed by the MPCA.

Answers to frequently asked questions about compliance and MPCA's enforcement of environmental rules in Minnesota.

Water scientists from the MPCA published four watershed reports in 2025, updating the data we need to keep Minnesota’s waters clean and protected.

State government agencies, in collaboration with local partners, are leading trailblazing work to protect Minnesotans from per- and polyfluoroalkyl substances (PFAS) pollution.