Is Watertown Waterworks Tap Water Safe? Quality Report

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

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
MCL	Health-based	Resolved	2004-07-01 → 2004-07-31
MCL	Health-based	Resolved	2004-07-01 → 2004-07-31
MCL	Health-based	Resolved	2004-07-01 → 2004-07-31
MCL	Health-based	Resolved	2004-07-01 → 2004-07-31
MCL	Health-based	Resolved	2004-07-01 → 2004-07-31
MCL	Health-based	Resolved	2001-12-01 → 2001-12-31
MCL	Health-based	Resolved	2001-12-01 → 2001-12-31
MCL	Health-based	Resolved	2001-12-01 → 2001-12-31
MCL	Health-based	Resolved	2001-12-01 → 2001-12-31
MCL	Health-based	Resolved	2001-12-01 → 2001-12-31

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
Copper	150 µg/L 12% of the EPA limit 1300 µg/L worst single sample: 260 µg/L	103/103	SYR4	2014–2017
Lead	16.9 µg/L 113% of the EPA limit, at the 95th percentile of samples — 15 µg/L worst single sample: 98 µg/L	103/103	SYR4	2014–2017
Fluoride	1239.5 µg/L 31% of the EPA limit 4000 µg/L worst single sample: 1500 µg/L	102/198	SYR4	2012–2019
Bromodichloromethane	5.3 µg/L No EPA limit set worst single sample: 5.6 µg/L	38/39	SYR4	2012–2019
Chloroform	8.065 µg/L No EPA limit set worst single sample: 10 µg/L	38/39	SYR4	2012–2019
Nitrate	1890 µg/L 19% of the EPA limit 10000 µg/L worst single sample: 2000 µg/L	32/36	SYR4	2012–2019
Dibromochloromethane	2.56 µg/L No EPA limit set worst single sample: 3 µg/L	25/39	SYR4	2012–2019
Lead	0.0110 mg/L 73% of the EPA limit 0.0150 mg/L	21/21	LCR	2024
TTHM	16.905 µg/L 21% of the EPA limit 80 µg/L worst single sample: 18.52 µg/L	18/18	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	6.0095 µg/L 10% of the EPA limit 60 µg/L worst single sample: 6.46 µg/L	18/18	SYR4	2012–2019
Trichloroacetic Acid	2.26 µg/L No EPA limit set worst single sample: 2.4 µg/L	15/18	SYR4	2012–2019
Dichloroacetic Acid	3.7 µg/L No EPA limit set	13/18	SYR4	2012–2019
Dibromoacetic Acid	0.7260 µg/L No EPA limit set worst single sample: 0.8800 µg/L	12/18	SYR4	2012–2019
Arsenic	2.1 µg/L 21% of the EPA limit 10 µg/L	6/6	SYR4	2014–2018
Barium	147.5 µg/L 7.4% of the EPA limit 2000 µg/L worst single sample: 150 µg/L	6/6	SYR4	2014–2018
Combined Radium (-226 And -228)	3.9672 pCi/L 79% of the EPA limit 5 pCi/L worst single sample: 4.054 pCi/L	5/5	SYR4	2014–2018
Gross Alpha, Excl. Radon And U	6.64 pCi/L 44% of the EPA limit 15 pCi/L worst single sample: 6.68 pCi/L	5/5	SYR4	2014–2018
Nitrate-Nitrite	1340 µg/L 13% of the EPA limit 10000 µg/L worst single sample: 1400 µg/L	5/6	SYR4	2014–2018
Monobromoacetic Acid	0.5980 µg/L No EPA limit set worst single sample: 0.6100 µg/L	3/18	SYR4	2012–2019
Combined Uranium	0.4580 µg/L 1.5% of the EPA limit 30 µg/L	1/1	SYR4	2018

88 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, TotalAtrazineBhc-GammaBenzeneBeryllium, TotalBromoformChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

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Frequently asked questions about Watertown Waterworks

Is Watertown Waterworks tap water safe to drink?

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

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

How many people does Watertown Waterworks serve?

Watertown Waterworks reports serving 23,945 people in Wisconsin, per its EPA record.

Has Watertown Waterworks had any water quality violations?

The EPA has 32 violations on file for Watertown Waterworks, of which 24 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.