Is Cass Lake Tap Water Safe? Quality Report

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

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
MR	Monitoring	Archived	1993-01-01 → 1993-12-31
MR	Monitoring	Archived	1993-01-01 → 1993-12-31
MR	Monitoring	Archived	1993-01-01 → 1993-12-31
MR	Monitoring	Archived	1993-01-01 → 1993-12-31

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
Fluoride	1211 µg/L 30% of the EPA limit 4000 µg/L worst single sample: 1400 µg/L	28/32	SYR4	2012–2019
Copper	561.2 µg/L 43% of the EPA limit 1300 µg/L worst single sample: 603 µg/L	20/20	SYR4	2014–2017
Bromodichloromethane	3.56 µg/L No EPA limit set worst single sample: 3.8 µg/L	9/10	SYR4	2013–2019
Chloroform	5.94 µg/L No EPA limit set worst single sample: 6.3 µg/L	9/10	SYR4	2013–2019
Dibromochloromethane	1.96 µg/L No EPA limit set worst single sample: 2.1 µg/L	8/10	SYR4	2013–2019
Lead	0.9545 µg/L 6.4% of the EPA limit 15 µg/L worst single sample: 1 µg/L	8/20	SYR4	2014–2017
Trichloroacetic Acid	2.08 µg/L No EPA limit set worst single sample: 2.1 µg/L	5/8	SYR4	2013–2019
Dichloroacetic Acid	1.985 µg/L No EPA limit set worst single sample: 2 µg/L	4/8	SYR4	2013–2019
Nitrate-Nitrite	60 µg/L 0.6% of the EPA limit 10000 µg/L	4/16	SYR4	2012–2019
Gross Alpha, Excl. Radon And U	6.1 pCi/L 41% of the EPA limit 15 pCi/L	1/1	SYR4	2012
Lead	0.0020 mg/L 13% of the EPA limit 0.0150 mg/L	1/1	LCR	2023

50 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAtrazineBhc-GammaBenzeneBenzo(A)PyreneBromoformChlorobenzeneCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDinosebEthylene DibromideEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMethoxychlorMonobromoacetic AcidMonochloroacetic AcidOxamylPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneTolueneToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Phone: 2183352238
Email: [email protected]

Frequently asked questions about Cass Lake

Is Cass Lake tap water safe to drink?

EPA monitoring detected 11 contaminants in Cass Lake'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 Cass Lake's water?

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

How many people does Cass Lake serve?

Cass Lake reports serving 691 people in Minnesota, per its EPA record.

Has Cass Lake had any water quality violations?

The EPA has 4 violations on file for Cass Lake, 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.