Is Stillwater Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Local government
Counties served: Washington

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

health-based violations

violations on file

still open

Violation	Type	Status	Period
RPT	Monitoring	Resolved	2025-07-02
RPT	Monitoring	Resolved	2025-07-02
Other	Monitoring	Resolved	2022-07-01
Other	Monitoring	Resolved	2022-07-01
MR	Monitoring	Archived	1991-04-01 → 1991-04-30
MR	Monitoring	Archived	1991-04-01 → 1991-04-30
MR	Monitoring	Archived	1991-04-01 → 1991-04-30

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).

Contaminant	Max	Detection rate	Period
Pfba	0.1180 µg/L	15/15	2025
Pfpea	0.0045 µg/L	6/15	2025
PFHXS	0.0072 µg/L	3/15	2025
PFOA	0.0052 µg/L	3/15	2025
PFOS	0.0081 µg/L	3/15	2025

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Nitrate-Nitrite	3700 µg/L 37% of the EPA limit 10000 µg/L worst single sample: 3800 µg/L	126/126	SYR4	2012–2019
Copper	712 µg/L 55% of the EPA limit 1300 µg/L worst single sample: 1110 µg/L	91/91	SYR4	2013–2019
Lead	5.7 µg/L 38% of the EPA limit 15 µg/L worst single sample: 89.3 µg/L	81/91	SYR4	2013–2019
Fluoride	1100 µg/L 28% of the EPA limit 4000 µg/L worst single sample: 1200 µg/L	33/33	SYR4	2012–2019
Dibromochloromethane	2.1 µg/L No EPA limit set worst single sample: 2.2 µg/L	29/62	SYR4	2012–2019
Bromodichloromethane	1.875 µg/L No EPA limit set worst single sample: 4.1 µg/L	26/62	SYR4	2012–2019
Bromoform	1.2 µg/L No EPA limit set worst single sample: 1.4 µg/L	22/62	SYR4	2012–2019
Chloroform	7.4 µg/L No EPA limit set worst single sample: 23 µg/L	21/62	SYR4	2012–2019
Lead	0.0020 mg/L 13% of the EPA limit 0.0150 mg/L	14/14	LCR	2025
Chromium	2.8 µg/L 2.8% of the EPA limit 100 µg/L	10/21	SYR4	2012–2018
Dibromoacetic Acid	1.18 µg/L No EPA limit set worst single sample: 1.2 µg/L	5/29	SYR4	2012–2019
Lithium	10.9 µg/L No EPA limit set	3/15	UCMR-5	2025
Ethylbenzene	0.5200 µg/L 0.1% of the EPA limit 700 µg/L	1/27	SYR4	2012–2018

84 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDichloroacetic AcidDinosebEthylene DibromideEndrinGlyphosateGross Alpha, Excl. Radon And UHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPfmbaPfmpaPFNAPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroacetic AcidTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Phone: 6514308800
Email: [email protected]

Frequently asked questions about Stillwater

Is Stillwater tap water safe to drink?

EPA monitoring detected 18 contaminants in Stillwater's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Stillwater's water?

EPA monitoring detected Nitrate-Nitrite, Copper, Lead, Fluoride, Dibromochloromethane, and others. The full list with the level and data source for each is above.

How many people does Stillwater serve?

Stillwater reports serving 19,462 people in Minnesota, per its EPA record.

Has Stillwater had any water quality violations?

The EPA has 7 violations on file for Stillwater, of which 0 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.