Is Grafton Waterworks Tap Water Safe? Quality Report

Water source: Ground 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

216

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Resolved	2000-06-01 → 2000-06-30
MCL	Health-based	Resolved	2000-06-01 → 2000-06-30
MCL	Health-based	Resolved	2000-06-01 → 2000-06-30
MCL	Health-based	Resolved	1994-03-01 → 1994-03-31
MCL	Health-based	Resolved	1994-03-01 → 1994-03-31
MCL	Health-based	Resolved	1994-03-01 → 1994-03-31
MR	Monitoring	Resolved	2008-01-01 → 2008-12-31
MR	Monitoring	Resolved	2008-01-01 → 2008-12-31
MR	Monitoring	Resolved	2008-01-01 → 2008-12-31
MR	Monitoring	Resolved	2008-01-01 → 2008-12-31

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
Trichloroethylene	31.05 µg/L 621% of the EPA limit, at the 95th percentile of samples — 5 µg/L worst single sample: 40 µg/L	120/265	SYR4	2012–2019
Fluoride	1070 µg/L 27% of the EPA limit 4000 µg/L worst single sample: 1280 µg/L	107/203	SYR4	2012–2019
cis-1,2-Dichloroethylene	4.9 µg/L 7% of the EPA limit 70 µg/L worst single sample: 5.4 µg/L	86/258	SYR4	2012–2019
Tetrachloroethylene	3.9 µg/L 78% of the EPA limit 5 µg/L worst single sample: 5.5 µg/L	76/245	SYR4	2012–2019
1,1,1-Trichloroethane	55.4 µg/L 28% of the EPA limit 200 µg/L worst single sample: 63 µg/L	65/241	SYR4	2012–2019
Bromodichloromethane	6.38 µg/L No EPA limit set worst single sample: 7.9 µg/L	65/211	SYR4	2012–2019
Chloroform	9.49 µg/L No EPA limit set worst single sample: 12 µg/L	62/211	SYR4	2012–2019
Nitrate	2295 µg/L 23% of the EPA limit 10000 µg/L worst single sample: 2700 µg/L	62/72	SYR4	2012–2019
Dibromochloromethane	5.6 µg/L No EPA limit set worst single sample: 7.1 µg/L	61/211	SYR4	2012–2019
Copper	561.5 µg/L 43% of the EPA limit 1300 µg/L worst single sample: 1400 µg/L	60/60	SYR4	2014–2017
Lead	5.05 µg/L 34% of the EPA limit 15 µg/L worst single sample: 17 µg/L	60/60	SYR4	2014–2017
1,1-Dichloroethylene	17 µg/L 243% of the EPA limit, at the 95th percentile of samples — 7 µg/L worst single sample: 18 µg/L	41/229	SYR4	2012–2019
Bromoform	1.985 µg/L No EPA limit set worst single sample: 2 µg/L	24/211	SYR4	2012–2019
TTHM	19.995 µg/L 25% of the EPA limit 80 µg/L worst single sample: 23.9 µg/L	24/24	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	7.6755 µg/L 13% of the EPA limit 60 µg/L worst single sample: 8.9 µg/L	24/24	SYR4	2012–2019
Dibromoacetic Acid	1.795 µg/L No EPA limit set worst single sample: 2.2 µg/L	22/24	SYR4	2012–2019
Trichloroacetic Acid	3.75 µg/L No EPA limit set worst single sample: 4.2 µg/L	16/24	SYR4	2012–2019
Dichloroacetic Acid	3.97 µg/L No EPA limit set worst single sample: 4.1 µg/L	14/24	SYR4	2012–2019
Lead	0.0033 mg/L 22% of the EPA limit 0.0150 mg/L	14/14	LCR	2023
Barium	150 µg/L 7.5% of the EPA limit 2000 µg/L	12/12	SYR4	2014–2017
Nitrate-Nitrite	2080 µg/L 21% of the EPA limit 10000 µg/L worst single sample: 2300 µg/L	12/12	SYR4	2014–2017
Combined Radium (-226 And -228)	1.42 pCi/L 28% of the EPA limit 5 pCi/L worst single sample: 1.45 pCi/L	7/7	SYR4	2014–2017
Arsenic	3.955 µg/L 40% of the EPA limit 10 µg/L worst single sample: 4 µg/L	4/12	SYR4	2014–2017
Monobromoacetic Acid	0.6130 µg/L No EPA limit set worst single sample: 0.6400 µg/L	4/24	SYR4	2012–2019
Carbon Tetrachloride	6.45 µg/L 129% of the EPA limit, at the 95th percentile of samples — 5 µg/L worst single sample: 6.6 µg/L	2/189	SYR4	2012–2019
Thallium, Total	0.2200 µg/L 11% of the EPA limit 2 µg/L	1/12	SYR4	2014–2017

47 contaminants tested, none detected

1,1,2-Trichloroethane1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalAtrazineBhc-GammaBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbofuranChlordaneChromiumDichloromethaneDalaponDinosebDiquatEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneVinyl ChlorideXylenes, TotalO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

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Frequently asked questions about Grafton Waterworks

Is Grafton Waterworks tap water safe to drink?

EPA monitoring detected 26 contaminants in Grafton 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 Grafton Waterworks's water?

EPA monitoring detected Trichloroethylene, Fluoride, cis-1,2-Dichloroethylene, Tetrachloroethylene, 1,1,1-Trichloroethane, and others. The full list with the level and data source for each is above.

How many people does Grafton Waterworks serve?

Grafton Waterworks reports serving 12,269 people in Wisconsin, per its EPA record.

Has Grafton Waterworks had any water quality violations?

The EPA has 216 violations on file for Grafton 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.