Is Thief River Falls Tap Water Safe? Quality Report

Water source: Surface water
Ownership: Local government
Counties served: Pennington

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
TT	Health-based	Archived	2025-01-01 → 2025-01-31
TT	Health-based	Archived	2025-01-01 → 2025-01-31
TT	Health-based	Archived	2025-01-01 → 2025-01-31
TT	Health-based	Resolved	2018-07-01 → 2018-07-31
TT	Health-based	Resolved	2018-07-01 → 2018-07-31
TT	Health-based	Resolved	2018-07-01 → 2018-07-31
TT	Health-based	Resolved	2018-07-01 → 2018-07-31
TT	Health-based	Resolved	2018-06-01 → 2018-06-30
TT	Health-based	Resolved	2018-06-01 → 2018-06-30
TT	Health-based	Resolved	2018-06-01 → 2018-06-30

PFAS detected

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

Contaminant	Max	Detection rate	Period
Pfba	0.0120 µg/L	4/4	2023

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
Chloroform	74.65 µg/L No EPA limit set worst single sample: 130 µg/L	68/68	SYR4	2012–2019
Copper	76.35 µg/L 5.9% of the EPA limit 1300 µg/L worst single sample: 197 µg/L	60/60	SYR4	2013–2019
Dichloroacetic Acid	50.55 µg/L No EPA limit set worst single sample: 65 µg/L	60/60	SYR4	2012–2019
Bromodichloromethane	5 µg/L No EPA limit set worst single sample: 5.2 µg/L	59/68	SYR4	2012–2019
Trichloroacetic Acid	6.86 µg/L No EPA limit set worst single sample: 16 µg/L	53/60	SYR4	2012–2019
Fluoride	1140 µg/L 28% of the EPA limit 4000 µg/L worst single sample: 1400 µg/L	33/33	SYR4	2012–2019
Monochloroacetic Acid	5.2 µg/L No EPA limit set worst single sample: 5.5 µg/L	33/60	SYR4	2012–2019
Lead	9.9 µg/L 66% of the EPA limit 15 µg/L worst single sample: 11.1 µg/L	31/60	SYR4	2013–2019
Lead	0.0070 mg/L 47% of the EPA limit 0.0150 mg/L	15/15	LCR	2023
Nitrate-Nitrite	650 µg/L 6.5% of the EPA limit 10000 µg/L	12/16	SYR4	2012–2019

90 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, TotalBromoformChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDibromochloromethaneDinosebEthylene DibromideEndrinEthylbenzeneGlyphosateGross Alpha, Excl. Radon And UHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidNetfosaaNfdhaNmefosaaOxamylPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Phone: 2186812943
Email: aphilipp@citytrf.net

Frequently asked questions about Thief River Falls

Is Thief River Falls tap water safe to drink?

EPA monitoring detected 11 contaminants in Thief River Falls'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 Thief River Falls's water?

EPA monitoring detected Chloroform, Copper, Dichloroacetic Acid, Bromodichloromethane, Trichloroacetic Acid, and others. The full list with the level and data source for each is above.

How many people does Thief River Falls serve?

Thief River Falls reports serving 8,701 people in Minnesota, per its EPA record.

Has Thief River Falls had any water quality violations?

The EPA has 79 violations on file for Thief River Falls, of which 68 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.