Is Port Washington Waterworks Tap Water Safe? Quality Report

Water source: Surface water
Ownership: Local government
Counties served: Ozaukee

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	Archived	1991-10-01 → 1991-10-31
MCL	Health-based	Archived	1991-10-01 → 1991-10-31
MCL	Health-based	Archived	1991-10-01 → 1991-10-31
MR	Monitoring	Archived	2025-10-01 → 2025-12-31
MR	Monitoring	Archived	2025-10-01 → 2025-12-31
MR	Monitoring	Archived	2025-10-01 → 2025-12-31
MR	Monitoring	Archived	2025-10-01 → 2025-12-31
MR	Monitoring	Resolved	2017-04-01 → 2017-06-30
MR	Monitoring	Resolved	2017-04-01 → 2017-06-30
MR	Monitoring	Resolved	2017-04-01 → 2017-06-30

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
Fluoride	1040 µg/L 26% of the EPA limit 4000 µg/L worst single sample: 1140 µg/L	104/200	SYR4	2012–2019
Copper	194.5 µg/L 15% of the EPA limit 1300 µg/L worst single sample: 440 µg/L	92/92	SYR4	2012–2018
Lead	10 µg/L 67% of the EPA limit 15 µg/L worst single sample: 20 µg/L	62/92	SYR4	2012–2018
Bromodichloromethane	11 µg/L No EPA limit set worst single sample: 13 µg/L	59/59	SYR4	2012–2019
Chloroform	20 µg/L No EPA limit set worst single sample: 27 µg/L	59/59	SYR4	2012–2019
Dibromochloromethane	4.84 µg/L No EPA limit set worst single sample: 5.8 µg/L	59/59	SYR4	2012–2019
Dichloroacetic Acid	8.92 µg/L No EPA limit set worst single sample: 11 µg/L	57/57	SYR4	2012–2019
TTHM	33.48 µg/L 42% of the EPA limit 80 µg/L worst single sample: 44.5 µg/L	57/57	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	18.16 µg/L 30% of the EPA limit 60 µg/L worst single sample: 24 µg/L	57/57	SYR4	2012–2019
Trichloroacetic Acid	11.2 µg/L No EPA limit set worst single sample: 13 µg/L	57/57	SYR4	2012–2019
Bromoform	0.5000 µg/L No EPA limit set worst single sample: 0.7000 µg/L	26/59	SYR4	2012–2019
Dibromoacetic Acid	1.1 µg/L No EPA limit set worst single sample: 1.2 µg/L	25/57	SYR4	2012–2019
Nitrate	600 µg/L 6% of the EPA limit 10000 µg/L	16/16	SYR4	2012–2019
Lead	0.0059 mg/L 39% of the EPA limit 0.0150 mg/L	15/15	LCR	2023
Barium	21 µg/L 1.1% of the EPA limit 2000 µg/L	8/8	SYR4	2012–2019
Nitrate-Nitrite	535 µg/L 5.4% of the EPA limit 10000 µg/L worst single sample: 610 µg/L	7/7	SYR4	2012–2018
Chromium	0.9640 µg/L 1% of the EPA limit 100 µg/L worst single sample: 1 µg/L	4/8	SYR4	2012–2019
Antimony, Total	0.1790 µg/L 3% of the EPA limit 6 µg/L worst single sample: 0.1800 µg/L	3/8	SYR4	2012–2019
Arsenic	0.5900 µg/L 5.9% of the EPA limit 10 µg/L worst single sample: 0.6000 µg/L	2/8	SYR4	2012–2019
Monochloroacetic Acid	1 µg/L No EPA limit set	2/57	SYR4	2012–2019
Nitrite	29 µg/L 2.9% of the EPA limit 1000 µg/L worst single sample: 30 µg/L	2/8	SYR4	2012–2019
Atrazine	0.0300 µg/L 1% of the EPA limit 3 µg/L	1/2	SYR4	2014–2017
Selenium	0.5000 µg/L 1% of the EPA limit 50 µg/L	1/8	SYR4	2012–2019
P-Dichlorobenzene	0.2000 µg/L 0.3% of the EPA limit 75 µg/L	1/2	SYR4	2014–2017

49 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane2,3,7,8-TCDD2,4,5-TP2,4-DBhc-GammaBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDinosebDiquatEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidOxamylPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-Dichlorobenzenetrans-1,2-Dichloroethylene

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Frequently asked questions about Port Washington Waterworks

Is Port Washington Waterworks tap water safe to drink?

EPA monitoring detected 24 contaminants in Port Washington 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 Port Washington Waterworks's water?

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

How many people does Port Washington Waterworks serve?

Port Washington Waterworks reports serving 12,853 people in Wisconsin, per its EPA record.

Has Port Washington Waterworks had any water quality violations?

The EPA has 39 violations on file for Port Washington Waterworks, of which 3 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.