Is Eau Claire Waterworks Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Local government
Counties served: Eau Claire

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	1999-06-01 → 1999-06-30
MCL	Health-based	Resolved	1999-06-01 → 1999-06-30
MCL	Health-based	Resolved	1999-06-01 → 1999-06-30
MCL	Health-based	Resolved	1999-06-01 → 1999-06-30
MCL	Health-based	Resolved	1999-06-01 → 1999-06-30
MCL	Health-based	Resolved	1999-06-01 → 1999-06-30
MR	Monitoring	Resolved	1992-07-01 → 1992-12-31
MR	Monitoring	Resolved	1992-06-30 → 1992-12-31

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	1130 µg/L 28% of the EPA limit 4000 µg/L worst single sample: 1170 µg/L	99/195	SYR4	2012–2019
Chloroform	33.35 µg/L No EPA limit set worst single sample: 35 µg/L	34/34	SYR4	2012–2019
Bromodichloromethane	4.69 µg/L No EPA limit set worst single sample: 5.1 µg/L	27/34	SYR4	2012–2019
Copper	61 µg/L 4.7% of the EPA limit 1300 µg/L worst single sample: 70 µg/L	26/61	SYR4	2014–2019
Lead	14 µg/L 93% of the EPA limit 15 µg/L worst single sample: 23 µg/L	19/60	SYR4	2014–2017
Nitrate	2400 µg/L 24% of the EPA limit 10000 µg/L	18/18	SYR4	2012–2019
TTHM	36.544 µg/L 46% of the EPA limit 80 µg/L worst single sample: 37.4 µg/L	17/17	SYR4	2012–2019
Lead	0.0020 mg/L 13% of the EPA limit 0.0150 mg/L	15/15	LCR	2023
Total Haloacetic Acids (HAA5)	9.696 µg/L 16% of the EPA limit 60 µg/L worst single sample: 11.32 µg/L	15/15	SYR4	2012–2019
Trichloroacetic Acid	4.73 µg/L No EPA limit set worst single sample: 4.8 µg/L	15/15	SYR4	2012–2019
Dichloroacetic Acid	5.83 µg/L No EPA limit set worst single sample: 8.3 µg/L	14/15	SYR4	2012–2019
Combined Radium (-226 And -228)	0.9586 pCi/L 19% of the EPA limit 5 pCi/L worst single sample: 0.9710 pCi/L	5/5	SYR4	2016–2019
Gross Alpha, Excl. Radon And U	0.8216 pCi/L 5.5% of the EPA limit 15 pCi/L worst single sample: 0.9520 pCi/L	5/5	SYR4	2017–2019
Barium	27.9 µg/L 1.4% of the EPA limit 2000 µg/L worst single sample: 30 µg/L	4/4	SYR4	2014–2019
Nitrate-Nitrite	2055 µg/L 21% of the EPA limit 10000 µg/L worst single sample: 2100 µg/L	4/4	SYR4	2014–2019
Combined Uranium	0.2060 µg/L 0.7% of the EPA limit 30 µg/L	1/1	SYR4	2018
Dibromochloromethane	0.6400 µg/L No EPA limit set	1/34	SYR4	2012–2019
Trichloroethylene	1.2 µg/L 24% of the EPA limit 5 µg/L	1/18	SYR4	2012–2019

57 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, TotalBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDibromoacetic AcidDinosebDiquatEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Frequently asked questions about Eau Claire Waterworks

Is Eau Claire Waterworks tap water safe to drink?

EPA monitoring detected 18 contaminants in Eau Claire 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 Eau Claire Waterworks's water?

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

How many people does Eau Claire Waterworks serve?

Eau Claire Waterworks reports serving 70,587 people, per its EPA record.

Has Eau Claire Waterworks had any water quality violations?

The EPA has 8 violations on file for Eau Claire Waterworks, of which 6 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.