Is Pewaukee City Water and Sewer Utility Tap Water Safe? Quality Report

Water source: Ground water
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.

232

health-based violations

472

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Archived	2026-01-01 → 2026-03-31
MCL	Health-based	Archived	2025-10-01 → 2025-12-31
MCL	Health-based	Archived	2025-10-01 → 2025-12-31
MCL	Health-based	Archived	2025-10-01 → 2025-12-31
MCL	Health-based	Archived	2025-10-01 → 2025-12-31
MCL	Health-based	Archived	2025-10-01 → 2025-12-31
MCL	Health-based	Archived	2025-10-01 → 2025-12-31
MCL	Health-based	Archived	2025-10-01 → 2025-12-31
MCL	Health-based	Archived	2025-10-01 → 2025-12-31
MCL	Health-based	Archived	2025-07-01 → 2025-09-30

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
Combined Radium (-226 And -228)	6.53 pCi/L 131% of the EPA limit, at the 95th percentile of samples — 5 pCi/L worst single sample: 7.85 pCi/L	91/91	SYR4	2012–2019
Gross Alpha, Excl. Radon And U	14.945 pCi/L 100% of the EPA limit 15 pCi/L worst single sample: 27.6267 pCi/L	88/88	SYR4	2012–2019
Combined Uranium	5.22667 µg/L 17% of the EPA limit 30 µg/L worst single sample: 5.77333 µg/L	76/76	SYR4	2012–2019
Copper	221 µg/L 17% of the EPA limit 1300 µg/L worst single sample: 530 µg/L	40/40	SYR4	2014–2017
Lead	18.2 µg/L 121% of the EPA limit, at the 95th percentile of samples — 15 µg/L worst single sample: 50 µg/L	39/40	SYR4	2014–2017
Bromodichloromethane	8.02 µg/L No EPA limit set worst single sample: 11 µg/L	29/30	SYR4	2013–2019
Chloroform	6.895 µg/L No EPA limit set worst single sample: 7.2 µg/L	28/30	SYR4	2013–2019
Dibromochloromethane	9.22 µg/L No EPA limit set worst single sample: 12 µg/L	27/30	SYR4	2013–2019
Bromoform	3.66 µg/L No EPA limit set worst single sample: 5.1 µg/L	19/26	SYR4	2013–2019
Barium	185 µg/L 9.3% of the EPA limit 2000 µg/L worst single sample: 200 µg/L	16/16	SYR4	2012–2017
Fluoride	445 µg/L 11% of the EPA limit 4000 µg/L worst single sample: 460 µg/L	16/16	SYR4	2012–2017
Nitrate	250 µg/L 2.5% of the EPA limit 10000 µg/L	16/94	SYR4	2012–2019
Lead	0.0026 mg/L 17% of the EPA limit 0.0150 mg/L	15/15	LCR	2023
TTHM	29.86 µg/L 37% of the EPA limit 80 µg/L worst single sample: 34.8 µg/L	14/14	SYR4	2013–2019
Total Haloacetic Acids (HAA5)	4.678 µg/L 7.8% of the EPA limit 60 µg/L worst single sample: 5.11 µg/L	13/13	SYR4	2013–2019
Dibromoacetic Acid	1.59 µg/L No EPA limit set worst single sample: 1.7 µg/L	12/13	SYR4	2013–2019
Trichloroacetic Acid	1.4825 µg/L No EPA limit set worst single sample: 2 µg/L	10/13	SYR4	2013–2019
Dichloroacetic Acid	2.3 µg/L No EPA limit set worst single sample: 2.4 µg/L	5/13	SYR4	2013–2019
Nitrate-Nitrite	160 µg/L 1.6% of the EPA limit 10000 µg/L	3/15	SYR4	2014–2017
Arsenic	6.13 µg/L 61% of the EPA limit 10 µg/L worst single sample: 6.4 µg/L	2/16	SYR4	2012–2017
Ethylbenzene	0.7080 µg/L 0.1% of the EPA limit 700 µg/L worst single sample: 0.7100 µg/L	2/35	SYR4	2012–2019
Xylenes, Total	5.695 µg/L 0.1% of the EPA limit 10000 µg/L worst single sample: 5.7 µg/L	2/35	SYR4	2012–2019
Mercury	0.3100 µg/L 16% of the EPA limit 2 µg/L	1/16	SYR4	2012–2017
Monobromoacetic Acid	0.4000 µg/L No EPA limit set	1/13	SYR4	2013–2019
Thallium, Total	0.2300 µg/L 12% of the EPA limit 2 µg/L	1/16	SYR4	2012–2017

51 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, TotalAtrazineBhc-GammaBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) PhthalateDinosebDiquatEndothallEndrinGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMethoxychlorMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Frequently asked questions about Pewaukee City Water and Sewer Utility

Is Pewaukee City Water and Sewer Utility tap water safe to drink?

EPA monitoring detected 25 contaminants in Pewaukee City Water and Sewer 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 Pewaukee City Water and Sewer Utility's water?

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

How many people does Pewaukee City Water and Sewer Utility serve?

Pewaukee City Water and Sewer Utility reports serving 8,671 people in Wisconsin, per its EPA record.

Has Pewaukee City Water and Sewer Utility had any water quality violations?

The EPA has 472 violations on file for Pewaukee City Water and Sewer Utility, of which 232 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.