Is Oakhill Correctional Inst Tap Water Safe? Quality Report

Water source: Ground water
Ownership: State government
Counties served: Dane

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
TT	Health-based	Resolved	2024-10-17
TT	Health-based	Resolved	2024-10-17
RPT	Monitoring	Resolved	2024-10-17
Other	Monitoring	Unaddressed	2024-10-17
Other	Monitoring	Unaddressed	2024-10-17
Other	Monitoring	Resolved	2024-07-01
Other	Monitoring	Resolved	2024-07-01
Other	Monitoring	Resolved	2024-07-01
Other	Monitoring	Resolved	2024-07-01
MR	Monitoring	Resolved	2019-04-01 → 2019-06-30

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	1046.2 µg/L 80% of the EPA limit 1300 µg/L worst single sample: 2430 µg/L	18/20	SYR4	2014–2017
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	17/17	LCR	2023
Nitrate	5280 µg/L 53% of the EPA limit 10000 µg/L	14/18	SYR4	2013–2018
Nitrate-Nitrite	5032 µg/L 50% of the EPA limit 10000 µg/L worst single sample: 5280 µg/L	9/15	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	3.0304 µg/L 5.1% of the EPA limit 60 µg/L worst single sample: 3.154 µg/L	7/7	SYR4	2013–2019
Barium	196.05 µg/L 9.8% of the EPA limit 2000 µg/L worst single sample: 198 µg/L	4/4	SYR4	2014–2017
Chloroform	1.8115 µg/L No EPA limit set worst single sample: 1.9 µg/L	4/9	SYR4	2013–2019
Dibromochloromethane	0.8882 µg/L No EPA limit set worst single sample: 0.9010 µg/L	4/9	SYR4	2013–2019
Monochloroacetic Acid	2.4475 µg/L No EPA limit set worst single sample: 2.5 µg/L	4/7	SYR4	2013–2019
TTHM	3.88275 µg/L 4.9% of the EPA limit 80 µg/L worst single sample: 3.996 µg/L	4/7	SYR4	2013–2019
Bromodichloromethane	1.343 µg/L No EPA limit set worst single sample: 1.35 µg/L	3/9	SYR4	2013–2019
Combined Radium (-226 And -228)	1.501 pCi/L 30% of the EPA limit 5 pCi/L worst single sample: 1.51 pCi/L	2/2	SYR4	2014
Fluoride	70 µg/L 1.8% of the EPA limit 4000 µg/L	2/4	SYR4	2014–2017
Gross Alpha, Excl. Radon And U	7.7985 pCi/L 52% of the EPA limit 15 pCi/L worst single sample: 7.92 pCi/L	2/2	SYR4	2014
Gross Beta Particle Activity	3.777 pCi/L No EPA limit set worst single sample: 3.86 pCi/L	2/2	SYR4	2014
Dichloroacetic Acid	1.2 µg/L No EPA limit set	1/7	SYR4	2013–2019
Lead	118 µg/L 787% of the EPA limit, at the 95th percentile of samples — 15 µg/L	1/20	SYR4	2014–2017
Selenium	2 µg/L 4% of the EPA limit 50 µg/L	1/4	SYR4	2014–2017
Trichloroacetic Acid	0.6080 µg/L No EPA limit set	1/7	SYR4	2013–2019

55 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, TotalArsenicAtrazineBhc-GammaBenzeneBeryllium, TotalBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDibromoacetic AcidDinosebDiquatEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidNitriteOxamylPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Frequently asked questions about Oakhill Correctional Inst

Is Oakhill Correctional Inst tap water safe to drink?

EPA monitoring detected 19 contaminants in Oakhill Correctional Inst'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 Oakhill Correctional Inst's water?

EPA monitoring detected Copper, Lead, Nitrate, Nitrate-Nitrite, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.

How many people does Oakhill Correctional Inst serve?

Oakhill Correctional Inst reports serving 1,096 people in Wisconsin, per its EPA record.

Has Oakhill Correctional Inst had any water quality violations?

The EPA has 18 violations on file for Oakhill Correctional Inst, of which 2 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.