Is Somerset Waterworks Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Local government
Counties served: St. Croix

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	Resolved	2024-10-17
MCL	Health-based	Resolved	2011-12-01 → 2011-12-31
MCL	Health-based	Resolved	2011-12-01 → 2011-12-31
MCL	Health-based	Resolved	2011-12-01 → 2011-12-31
MCL	Health-based	Resolved	2011-12-01 → 2011-12-31
MCL	Health-based	Resolved	2011-12-01 → 2011-12-31
MCL	Health-based	Resolved	2011-11-01 → 2011-11-30
MCL	Health-based	Resolved	2011-11-01 → 2011-11-30
MCL	Health-based	Resolved	2011-11-01 → 2011-11-30
MCL	Health-based	Resolved	2011-11-01 → 2011-11-30

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	3735 µg/L 37% of the EPA limit 10000 µg/L worst single sample: 3900 µg/L	32/34	SYR4	2012–2019
Copper	264.6 µg/L 20% of the EPA limit 1300 µg/L worst single sample: 495 µg/L	19/21	SYR4	2014–2019
Lead	0.0018 mg/L 12% of the EPA limit 0.0150 mg/L	14/14	LCR	2023
Lead	8.033 µg/L 54% of the EPA limit 15 µg/L worst single sample: 9.44 µg/L	8/21	SYR4	2014–2019
Chloroform	2.398 µg/L No EPA limit set worst single sample: 2.53 µg/L	7/7	SYR4	2016–2019
TTHM	8.404 µg/L 11% of the EPA limit 80 µg/L worst single sample: 9.61 µg/L	7/7	SYR4	2016–2019
Total Haloacetic Acids (HAA5)	18.0827 µg/L 30% of the EPA limit 60 µg/L worst single sample: 18.746 µg/L	7/7	SYR4	2016–2019
Bromodichloromethane	3.0025 µg/L No EPA limit set worst single sample: 3.33 µg/L	6/7	SYR4	2016–2019
Monochloroacetic Acid	17.4 µg/L No EPA limit set worst single sample: 17.9 µg/L	6/7	SYR4	2016–2019
Barium	32.99 µg/L 1.6% of the EPA limit 2000 µg/L worst single sample: 35 µg/L	4/4	SYR4	2014–2017
Dibromochloromethane	3.417 µg/L No EPA limit set worst single sample: 3.75 µg/L	4/7	SYR4	2016–2019
Nitrate-Nitrite	3543 µg/L 35% of the EPA limit 10000 µg/L worst single sample: 3600 µg/L	4/5	SYR4	2014–2019
Combined Radium (-226 And -228)	1.5659 pCi/L 31% of the EPA limit 5 pCi/L worst single sample: 1.61 pCi/L	3/3	SYR4	2014–2019
Fluoride	145 µg/L 3.6% of the EPA limit 4000 µg/L worst single sample: 150 µg/L	3/5	SYR4	2014–2019
Gross Alpha, Excl. Radon And U	3.154 pCi/L 21% of the EPA limit 15 pCi/L worst single sample: 3.4 pCi/L	3/3	SYR4	2014–2019
Selenium	1 µg/L 2% of the EPA limit 50 µg/L	2/4	SYR4	2014–2017
Combined Uranium	0.5730 µg/L 1.9% of the EPA limit 30 µg/L	1/1	SYR4	2019
Dibromoacetic Acid	0.8000 µg/L No EPA limit set	1/7	SYR4	2016–2019
Dichloroacetic Acid	0.7560 µg/L No EPA limit set	1/7	SYR4	2016–2019
Trichloroacetic Acid	0.4200 µg/L No EPA limit set	1/7	SYR4	2016–2019

55 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBeryllium, TotalBromoformChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDinosebDiquatEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidNitriteOxamylPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

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Frequently asked questions about Somerset Waterworks

Is Somerset Waterworks tap water safe to drink?

EPA monitoring detected 20 contaminants in Somerset Waterworks'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 Somerset Waterworks's water?

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

How many people does Somerset Waterworks serve?

Somerset Waterworks reports serving 3,334 people in Wisconsin, per its EPA record.

Has Somerset Waterworks had any water quality violations?

The EPA has 41 violations on file for Somerset Waterworks, of which 19 are health-based (a contaminant limit or required treatment was breached) and 2 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.