Is Green Bay Waterworks Tap Water Safe? Quality Report

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

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
MR	Monitoring	Resolved	2016-07-01 → 2016-12-31
MR	Monitoring	Resolved	2016-07-01 → 2016-12-31
MR	Monitoring	Resolved	2016-07-01 → 2016-12-31
MR	Monitoring	Resolved	2016-07-01 → 2016-12-31
MR	Monitoring	Resolved	2016-07-01 → 2016-12-31
MR	Monitoring	Resolved	2016-07-01 → 2016-12-31
MR	Monitoring	Resolved	2016-07-01 → 2016-12-31
MR	Monitoring	Resolved	2016-07-01 → 2016-12-31
MR	Monitoring	Resolved	2016-01-01 → 2016-06-30
MR	Monitoring	Resolved	2016-01-01 → 2016-06-30

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
Copper	790 µg/L 61% of the EPA limit 1300 µg/L worst single sample: 1200 µg/L	974/977	SYR4	2012–2019
Lead	22 µg/L 147% of the EPA limit, at the 95th percentile of samples — 15 µg/L worst single sample: 490 µg/L	956/978	SYR4	2012–2019
Bromodichloromethane	12.55 µg/L No EPA limit set worst single sample: 15 µg/L	130/132	SYR4	2012–2019
Chloroform	19.55 µg/L No EPA limit set worst single sample: 25 µg/L	130/132	SYR4	2012–2019
Dibromochloromethane	6.7 µg/L No EPA limit set worst single sample: 8.5 µg/L	130/132	SYR4	2012–2019
TTHM	39.663 µg/L 50% of the EPA limit 80 µg/L worst single sample: 45.7 µg/L	128/128	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	9.965 µg/L 17% of the EPA limit 60 µg/L worst single sample: 14.2 µg/L	128/128	SYR4	2012–2019
Dichloroacetic Acid	5.24 µg/L No EPA limit set worst single sample: 7.3 µg/L	127/128	SYR4	2012–2019
Trichloroacetic Acid	3.6 µg/L No EPA limit set worst single sample: 5.6 µg/L	109/128	SYR4	2012–2019
Bromoform	1.2 µg/L No EPA limit set worst single sample: 1.5 µg/L	108/132	SYR4	2012–2019
Fluoride	1765 µg/L 44% of the EPA limit 4000 µg/L worst single sample: 2900 µg/L	108/204	SYR4	2012–2019
Bromate	5.615 µg/L 56% of the EPA limit 10 µg/L worst single sample: 12 µg/L	88/96	SYR4	2012–2019
Dibromoacetic Acid	1.4 µg/L No EPA limit set worst single sample: 2 µg/L	74/128	SYR4	2012–2019
Nitrate	1162.5 µg/L 12% of the EPA limit 10000 µg/L worst single sample: 2300 µg/L	34/48	SYR4	2012–2019
Lead	0.0025 mg/L 17% of the EPA limit 0.0150 mg/L	25/25	LCR	2023
Monobromoacetic Acid	0.8300 µg/L No EPA limit set worst single sample: 0.9300 µg/L	22/128	SYR4	2012–2019
Barium	46.35 µg/L 2.3% of the EPA limit 2000 µg/L worst single sample: 48 µg/L	12/12	SYR4	2012–2017
Combined Radium (-226 And -228)	9.0025 pCi/L 180% of the EPA limit, at the 95th percentile of samples — 5 pCi/L worst single sample: 10.87 pCi/L	10/10	SYR4	2014
Gross Alpha, Excl. Radon And U	27.745 pCi/L 185% of the EPA limit, at the 95th percentile of samples — 15 pCi/L worst single sample: 35.2 pCi/L	8/8	SYR4	2014
Arsenic	18 µg/L 180% of the EPA limit, at the 95th percentile of samples — 10 µg/L worst single sample: 20 µg/L	6/11	SYR4	2012–2017
Nitrate-Nitrite	309 µg/L 3.1% of the EPA limit 10000 µg/L worst single sample: 310 µg/L	2/3	SYR4	2014
Combined Uranium	4.8 µg/L 16% of the EPA limit 30 µg/L	1/1	SYR4	2014

58 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-DAntimony, TotalAtrazineBhc-GammaBenzeneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

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Frequently asked questions about Green Bay Waterworks

Is Green Bay Waterworks tap water safe to drink?

EPA monitoring detected 22 contaminants in Green Bay 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 Green Bay Waterworks's water?

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

How many people does Green Bay Waterworks serve?

Green Bay Waterworks reports serving 107,369 people in Wisconsin, per its EPA record.

Has Green Bay Waterworks had any water quality violations?

The EPA has 21 violations on file for Green Bay Waterworks, of which 0 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.