Is Waukesha Water Utility Tap Water Safe? Quality Report

Water source: SWP
Ownership: Local government
Counties served: Waukesha

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.

2,447

health-based violations

2,526

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Resolved	2023-10-01 → 2023-12-31
MCL	Health-based	Resolved	2023-10-01 → 2023-12-31
MCL	Health-based	Resolved	2023-10-01 → 2023-12-31
MCL	Health-based	Resolved	2023-10-01 → 2023-12-31
MCL	Health-based	Resolved	2023-10-01 → 2023-12-31
MCL	Health-based	Resolved	2023-10-01 → 2023-12-31
MCL	Health-based	Resolved	2023-10-01 → 2023-12-31
MCL	Health-based	Resolved	2023-10-01 → 2023-12-31
MCL	Health-based	Resolved	2023-10-01 → 2023-12-31
MCL	Health-based	Resolved	2023-10-01 → 2023-12-31

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
Combined Radium (-226 And -228)	12.0395 pCi/L 241% of the EPA limit, at the 95th percentile of samples — 5 pCi/L worst single sample: 22 pCi/L	242/242	SYR4	2012–2019
Gross Beta Particle Activity	18.505 pCi/L No EPA limit set worst single sample: 28.8 pCi/L	240/240	SYR4	2012–2019
Gross Alpha, Excl. Radon And U	28.88 pCi/L 193% of the EPA limit, at the 95th percentile of samples — 15 pCi/L worst single sample: 48.2 pCi/L	239/239	SYR4	2012–2019
Combined Uranium	1.35867 µg/L 4.5% of the EPA limit 30 µg/L worst single sample: 1.64 µg/L	169/169	SYR4	2012–2019
Fluoride	912.5 µg/L 23% of the EPA limit 4000 µg/L worst single sample: 970 µg/L	116/212	SYR4	2012–2019
Copper	208 µg/L 16% of the EPA limit 1300 µg/L worst single sample: 320 µg/L	65/65	SYR4	2014–2017
Lead	3.42 µg/L 23% of the EPA limit 15 µg/L worst single sample: 8.1 µg/L	60/65	SYR4	2014–2017
Bromodichloromethane	6.4 µg/L No EPA limit set worst single sample: 7.15 µg/L	35/48	SYR4	2012–2019
Dibromochloromethane	5.36 µg/L No EPA limit set worst single sample: 6.2 µg/L	33/48	SYR4	2012–2019
Chloroform	6.26 µg/L No EPA limit set worst single sample: 6.96 µg/L	29/48	SYR4	2012–2019
TTHM	19.79 µg/L 25% of the EPA limit 80 µg/L worst single sample: 22.18 µg/L	22/22	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	3.9476 µg/L 6.6% of the EPA limit 60 µg/L worst single sample: 4.19 µg/L	22/22	SYR4	2012–2019
Barium	170.5 µg/L 8.5% of the EPA limit 2000 µg/L worst single sample: 180 µg/L	20/20	SYR4	2014–2017
Bromoform	1.8715 µg/L No EPA limit set worst single sample: 1.9 µg/L	20/48	SYR4	2012–2019
Dibromoacetic Acid	1.51 µg/L No EPA limit set worst single sample: 1.7 µg/L	20/22	SYR4	2012–2019
Lead	0.00056 mg/L 3.7% of the EPA limit 0.0150 mg/L	17/17	LCR	2024
Dichloroacetic Acid	2.355 µg/L No EPA limit set worst single sample: 2.6 µg/L	8/22	SYR4	2012–2019
Trichloroacetic Acid	0.7350 µg/L No EPA limit set worst single sample: 0.7500 µg/L	7/22	SYR4	2012–2019
Nitrate	170 µg/L 1.7% of the EPA limit 10000 µg/L	6/94	SYR4	2012–2019
Monobromoacetic Acid	0.4870 µg/L No EPA limit set worst single sample: 0.4900 µg/L	4/22	SYR4	2012–2019
Arsenic	2.79 µg/L 28% of the EPA limit 10 µg/L worst single sample: 2.8 µg/L	3/20	SYR4	2014–2017
Cyanide	39.4 µg/L 20% of the EPA limit 200 µg/L worst single sample: 40 µg/L	3/4	SYR4	2015
Nitrate-Nitrite	100 µg/L 1% of the EPA limit 10000 µg/L	2/20	SYR4	2014–2017
Antimony, Total	0.4200 µg/L 7% of the EPA limit 6 µg/L	1/20	SYR4	2014–2017

55 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-GammaBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Frequently asked questions about Waukesha Water Utility

Is Waukesha Water Utility tap water safe to drink?

EPA monitoring detected 24 contaminants in Waukesha Water Utility'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 Waukesha Water Utility's water?

EPA monitoring detected Combined Radium (-226 And -228), Gross Beta Particle Activity, Gross Alpha, Excl. Radon And U, Combined Uranium, Fluoride, and others. The full list with the level and data source for each is above.

How many people does Waukesha Water Utility serve?

Waukesha Water Utility reports serving 70,718 people, per its EPA record.

Has Waukesha Water Utility had any water quality violations?

The EPA has 2526 violations on file for Waukesha Water Utility, of which 2447 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.