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Every two years, MPCA creates a list of impaired waters in the state that do not meet water quality standards.

A watershed is the area of land where all of the water that drains off of it goes into the same place — a river, stream or lake.

The MPCA is authorized to develop numeric water quality criteria that apply specifically to a water body or region where the pollutant is found, using data from that water body or region.

Standard operating procedures (SOPs) reflect how agency staff and contracted partners complete agency-funded field activities.

Southeastern Minnesota is characterized by an unusual type of geography called karst, where the distinction between groundwater and surface water is blurry.

Owners/operators of construction activity must complete several steps before completing a permit application and beginning construction. These steps also help owners/operators determine their eligibility for coverage under the general permit.

Water quality standards are frequently adopted statewide or by ecoregions. These standards can include large areas with different types of water, biological communities and natural water chemistries.

To protect human health and the environment, we need to limit the amount of per- and polyfluoroalkyl substances (PFAS) in our waters to safe levels. Safe levels means water can be used for drinking,…

State and federal permits and regulations that are designed to protect groundwater and surface water (lakes, rivers, streams, and wetlands) apply to specific facilities and processes that could pose…

Planned amendments to Minn. Rules ch. 7050 affect the Class 1 beneficial use, which protects waters (both surface and groundwater) used as a source for domestic consumption.

The MPCA plans to amend Minnesota Rules chapter 7050, which establishes beneficial uses and water quality standards to protect those uses, and designates where the uses occur in waters of the state.

What's in My Neighborhood provides a wide variety of environmental information about your community. Search for:properties that were previously contaminated and those being investigated for…

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.

State agencies, counties, municipalities, nonprofit organizations, and many others are engaged in protecting Minnesota lakes.

Chloride is a problem for wastewater facilities and stormwater permittees.

Protecting and restoring water quality is one of the MPCA's core areas of focus.

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

Clean Water Fund dollars come from the Clean Water, Land and Legacy Amendment that Minnesotans approved in 2008.

Wild rice is an important part of the biological community in many Minnesota lakes, streams, and wetlands, and a cultural resource to many, particularly members of the Dakota and Ojibwe Tribal Nations in Minnesota.

Guidance and recommendations for local officials dealing with public health issues related to blue-green algae.