Is Oshkosh Waterworks Tap Water Safe? Quality Report

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

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	2023-07-01 → 2023-09-30
MR	Monitoring	Resolved	2023-07-01 → 2023-09-30
MR	Monitoring	Resolved	2023-07-01 → 2023-09-30
MR	Monitoring	Resolved	2023-07-01 → 2023-09-30
MR	Monitoring	Resolved	2018-07-01 → 2018-09-30
MR	Monitoring	Resolved	2018-07-01 → 2018-09-30
MR	Monitoring	Resolved	2018-07-01 → 2018-09-30
MR	Monitoring	Resolved	2018-07-01 → 2018-09-30
MR	Monitoring	Resolved	2014-07-01 → 2014-09-30
MR	Monitoring	Resolved	2014-07-01 → 2014-09-30

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
Chloroform	16 µg/L No EPA limit set worst single sample: 21 µg/L	249/249	SYR4	2012–2019
TTHM	18.04 µg/L 23% of the EPA limit 80 µg/L worst single sample: 23.4 µg/L	245/245	SYR4	2012–2019
Dichloroacetic Acid	7.67 µg/L No EPA limit set worst single sample: 8.7 µg/L	244/245	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	8.485 µg/L 14% of the EPA limit 60 µg/L worst single sample: 11.1 µg/L	244/245	SYR4	2012–2019
Bromodichloromethane	2 µg/L No EPA limit set worst single sample: 2.1 µg/L	187/249	SYR4	2012–2019
Trichloroacetic Acid	1.62 µg/L No EPA limit set worst single sample: 3.1 µg/L	117/245	SYR4	2012–2019
Fluoride	784.6 µg/L 20% of the EPA limit 4000 µg/L worst single sample: 890 µg/L	99/196	SYR4	2012–2019
Copper	590.5 µg/L 45% of the EPA limit 1300 µg/L worst single sample: 800 µg/L	60/60	SYR4	2014–2017
Lead	14 µg/L 93% of the EPA limit 15 µg/L worst single sample: 22 µg/L	51/60	SYR4	2014–2017
Dibromochloromethane	0.3000 µg/L No EPA limit set worst single sample: 0.4000 µg/L	39/249	SYR4	2012–2019
Lead	0.0061 mg/L 41% of the EPA limit 0.0150 mg/L	17/17	LCR	2025
Monochloroacetic Acid	3.05 µg/L No EPA limit set worst single sample: 3.2 µg/L	16/245	SYR4	2012–2019
Nitrate	1600 µg/L 16% of the EPA limit 10000 µg/L	16/16	SYR4	2012–2019
Dibromoacetic Acid	0.3000 µg/L No EPA limit set	14/245	SYR4	2012–2019
Bromoform	0.1450 µg/L No EPA limit set worst single sample: 0.2000 µg/L	12/249	SYR4	2012–2019
Monobromoacetic Acid	0.5820 µg/L No EPA limit set worst single sample: 0.6000 µg/L	7/245	SYR4	2012–2019
Bromate	5.25 µg/L 53% of the EPA limit 10 µg/L worst single sample: 6 µg/L	6/96	SYR4	2012–2019
Atrazine	0.0200 µg/L 0.7% of the EPA limit 3 µg/L	2/4	SYR4	2014–2017
Barium	22.9 µg/L 1.1% of the EPA limit 2000 µg/L worst single sample: 23 µg/L	2/2	SYR4	2014–2017
Nitrate-Nitrite	596.5 µg/L 6% of the EPA limit 10000 µg/L worst single sample: 600 µg/L	2/2	SYR4	2014–2017
Arsenic	0.4000 µg/L 4% of the EPA limit 10 µg/L	1/2	SYR4	2014–2017
Cyanide	1 µg/L 0.5% of the EPA limit 200 µg/L	1/2	SYR4	2014–2017
Combined Radium (-226 And -228)	0.8600 pCi/L 17% of the EPA limit 5 pCi/L	1/1	SYR4	2014
Combined Uranium	0.0900 µg/L 0.3% of the EPA limit 30 µg/L	1/1	SYR4	2014
Gross Alpha, Excl. Radon And U	0.2400 pCi/L 1.6% of the EPA limit 15 pCi/L	1/1	SYR4	2014

57 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,3,7,8-TCDD2,4,5-TP2,4-DAntimony, TotalBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

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Frequently asked questions about Oshkosh Waterworks

Is Oshkosh Waterworks tap water safe to drink?

EPA monitoring detected 25 contaminants in Oshkosh 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 Oshkosh Waterworks's water?

EPA monitoring detected Chloroform, TTHM, Dichloroacetic Acid, Total Haloacetic Acids (HAA5), Bromodichloromethane, and others. The full list with the level and data source for each is above.

How many people does Oshkosh Waterworks serve?

Oshkosh Waterworks reports serving 63,000 people in Wisconsin, per its EPA record.

Has Oshkosh Waterworks had any water quality violations?

The EPA has 17 violations on file for Oshkosh 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.