Minnesota Tap Water Quality Rankings 2026: 8th in Nation | WaterQ

Minnesota ranks 8th in our 2026 national tap water quality analysis, one of the strongest showings in the country. The state's land of lakes benefits from generally abundant, high-quality source water and well-funded utilities — though the East Metro PFAS case, one of the most significant in the nation, remains an important exception that has shaped both local water systems and state policy.

Key Findings for Minnesota

Reviewing EPA SDWIS data for 2026, three themes define Minnesota's water quality landscape:

• East Metro PFAS: Communities east of the Twin Cities, including parts of Washington and Ramsey counties, have documented PFAS contamination in groundwater linked to historical disposal practices by 3M. A landmark legal settlement has funded filtration systems, new wells, and connections to alternative water supplies for affected communities.
• Agricultural Nitrate: In central and southern Minnesota's farming regions, nitrate from fertilizer application can elevate levels in shallow groundwater used by some smaller community systems and private wells.
• Strong Overall Infrastructure: Outside these specific areas, Minnesota's municipal water systems are generally well-resourced and post strong compliance records, contributing to the state's high overall ranking.

Most Common Contaminants in Minnesota

Here's what Minnesota residents should know about the contaminants most relevant to their water:

1. PFAS ("Forever Chemicals")

The East Metro PFAS case is one of the most studied in the country. Affected communities have benefited from major investment in granular activated carbon treatment and alternative water sources, funded in large part through a settlement with 3M, and ongoing monitoring continues across the affected area.

2. Nitrate

In Minnesota's agricultural heartland, nitrate from fertilizer can elevate levels in shallow groundwater. Community systems in these areas are monitored under the Safe Drinking Water Act, but private well owners — common in rural Minnesota — should test independently, particularly for infants in the household.

3. Manganese

Some groundwater-dependent systems in Minnesota have naturally elevated manganese, which is primarily an aesthetic concern (taste, staining) but has drawn increased health-based attention in recent years, prompting some utilities to add treatment.

Minnesota's Best and Worst Cities for Water Quality

Explore the full breakdown on our Minnesota water systems page.

Top Performers: Twin Cities metro utilities outside the East Metro PFAS area, drawing from the Mississippi River and well-protected groundwater, generally show strong compliance records.

Areas to Watch: East Metro communities remain under active PFAS monitoring despite major remediation investment, and agricultural areas in central and southern Minnesota warrant nitrate testing for private wells.

What Minnesota Residents Should Do

Given Minnesota's 8th place ranking, here's what matters most for residents:

1. Check PFAS Data If You're in the East Metro: Residents in Washington and Ramsey counties should review their utility's PFAS monitoring results and any treatment or alternative supply provided through the 3M settlement.
2. Search Your System's Record: Use the WaterQ search tool to view your water system's violation history and recent contaminant levels.
3. Test Private Wells for Nitrate: Rural residents in agricultural areas should test private wells annually for nitrate, especially if infants are in the household.
4. Consider Filtration: Granular activated carbon helps with PFAS, while reverse osmosis provides broader protection including for nitrate.

Source: Minnesota Department of Health Drinking Water Protection Program, EPA SDWIS 2026 Compliance Data, and WaterQ National Database. For more information on our ranking process, visit our state rankings page.