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Water quality

Minnesota water quality

Minnesota drinking water is overseen by the Minnesota Department of Health (MDH) and generally meets federal standards, but two documented regional issues stand out. According to MDH and the state's 3M PFAS settlement, decades of PFAS disposal contaminated East Metro groundwater serving over 140,000 people. According to MDH and the Minnesota Department of Agriculture, nitrate from farm runoff affects private wells in the karst region of southeastern Minnesota.

Documented considerations

PFAS

According to the state's 3M settlement and MDH, 3M's mid-20th-century disposal of PFAS at East Metro sites contaminated an area of groundwater spanning over 150 square miles and affected drinking water for more than 140,000 Minnesotans. A 2018 settlement provided 850 million dollars, largely for East Metro drinking water and natural resource projects.

Nitrate

According to MDH and the Minnesota Department of Agriculture, the karst geology of southeastern Minnesota lets fertilizer runoff reach groundwater quickly, and testing has found over 10 percent of private wells in some townships exceeding the 10 mg/L nitrate limit.

Hardness

Much of Minnesota's groundwater is hard to very hard due to mineral-rich glacial and limestone aquifers. Hardness is an aesthetic and scale issue rather than a health hazard.

Lead

As in many older US communities, lead service lines and plumbing in some Minnesota cities can contribute lead to tap water, and MDH supports inventories and replacement efforts.

EPA compliance snapshot

From the EPA ECHO Safe Drinking Water Act database, Minnesota community water systems carrying one or more violations on record:

284
systems with a violation on record
3
with a health-based violation
1
flagged serious violators

Most common violation categories

  • Revised Total Coliform Rule (47)
  • Chlorine (16)
  • Lead and Copper Rule (15)
  • Nitrate (13)
  • Public Notice (9)
  • Lead and Copper Rule Revisions (8)

Counts are public EPA ECHO figures. 'Health-based' means a system carries at least one health-based violation flag in ECHO. A violation on record is not a statement that current tap water is unsafe; most systems return to compliance. Always check your utility's Consumer Confidence Report for current status. Source: EPA ECHO, retrieved 2026-06-01.

Certified filters for Minnesota's main concerns

FAQ

What is the 3M PFAS issue in Minnesota?
According to MDH and the state's settlement, 3M disposed of PFAS at several East Metro sites decades ago, contaminating groundwater across more than 150 square miles and affecting drinking water for over 140,000 residents. A 2018 850 million dollar settlement is funding drinking water cleanup and infrastructure projects in the affected communities.
Is nitrate a concern for Minnesota well owners?
In parts of southeastern Minnesota, yes. According to MDH and the Department of Agriculture, the region's karst geology allows farm-fertilizer nitrate to reach groundwater quickly, and testing has found many private wells above the 10 mg/L limit. Private well owners in affected areas are encouraged to test their water.
Is Minnesota tap water safe?
Most Minnesota public water systems meet EPA and MDH standards. Documented regional concerns include PFAS in the East Metro and nitrate in southeastern private wells. Reviewing your utility's report, or testing a private well, is the best way to understand your specific water.

Sources

  1. Minnesota 3M PFAS Settlement
  2. MN Pollution Control Agency - East Metro 3M PFAS
  3. MN Dept. of Health - Nitrate in Drinking Water

Not sure how to read your local report? See our guide on reading a water quality report.