A86/100
Stillwater Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 19,462 residents · Minnesota
What's In Stillwater's Tap Water?
66
Contaminants Tested
1
Exceed EPA Limits
1
Above EPA Goals
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
PFOS | 0.008 µg/L | 0.004 µg/L | Over Limit |
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
2
Violations (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Reporting Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: July 2, 2025 – November 22, 2024Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2022 – December 12, 2022Enforcement: Resolving — corrective action underway
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Water Utility Details
Stillwater
Population Served
19,462
Water Source
Groundwater
System ID
MN1820024
Frequently Asked Questions About Stillwater Water
Is Stillwater tap water safe to drink?
Stillwater, Minnesota tap water receives a grade of A (86/100), which is considered excellent. Out of 66 contaminants tested, 1 exceed EPA maximum contaminant levels (MCLs) and 2 exceed health guidelines (MCLGs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.
What contaminants are in Stillwater's water?
Of the 66 contaminants tested in Stillwater's water supply, the most notable include PFOS, Lead (90th percentile). 1 contaminant(s) exceed EPA legal limits (MCLs). 2 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Stillwater have any water quality violations?
Yes, Stillwater has 3 EPA violation(s) on record, with the most recent in 2025. Violation types include RPT, Other, MR. None of these are classified as health-based violations.
Do I need a water filter in Stillwater?
Based on EPA data, using a water filter in Stillwater is recommended. 1 contaminant(s) exceed legal limits. An NSF-certified filter — such as a reverse osmosis or activated carbon system — can effectively reduce many common contaminants. Choose a filter certified to remove the specific contaminants found in your area.
Where does Stillwater's tap water come from?
Stillwater's drinking water is sourced from groundwater and supplied by Stillwater. The system serves approximately 19,462 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Stillwater's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Stillwater's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does Stillwater's water compare to other cities in Minnesota?
Stillwater's water quality score of 86/100 earns a grade of A, which is considered excellent. This places Stillwater among the better-performing water systems in Minnesota. Visit our Minnesota state page to see how all cities in the state compare.
What should I do if I'm concerned about Stillwater's water quality?
If you have concerns about Stillwater's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (Stillwater) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.