Is Waunakee Waterworks Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Local 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
MR	Monitoring	Resolved	2024-01-01 → 2024-12-31
MR	Monitoring	Resolved	2024-01-01 → 2024-12-31
MR	Monitoring	Resolved	2024-01-01 → 2024-12-31
MR	Monitoring	Resolved	2024-01-01 → 2024-12-31
MR	Monitoring	Resolved	2024-01-01 → 2024-12-31
MR	Monitoring	Resolved	2024-01-01 → 2024-12-31
MR	Monitoring	Resolved	2024-01-01 → 2024-12-31
MR	Monitoring	Resolved	2024-01-01 → 2024-12-31
MON	Monitoring	Resolved	2022-02-01 → 2022-02-28
MON	Monitoring	Resolved	2022-02-01 → 2022-02-28

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	870.5 µg/L 22% of the EPA limit 4000 µg/L worst single sample: 1130 µg/L	100/202	SYR4	2012–2019
Nitrate	5425 µg/L 54% of the EPA limit 10000 µg/L worst single sample: 6400 µg/L	76/76	SYR4	2012–2019
Copper	173 µg/L 13% of the EPA limit 1300 µg/L worst single sample: 340 µg/L	60/60	SYR4	2014–2017
Lead	3.205 µg/L 21% of the EPA limit 15 µg/L worst single sample: 4.3 µg/L	60/60	SYR4	2014–2017
Lead	0.0017 mg/L 11% of the EPA limit 0.0150 mg/L	15/15	LCR	2023
Combined Radium (-226 And -228)	3.4327 pCi/L 69% of the EPA limit 5 pCi/L worst single sample: 3.902 pCi/L	14/14	SYR4	2012–2017
TTHM	3.235 µg/L 4% of the EPA limit 80 µg/L worst single sample: 3.51 µg/L	11/16	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	0.9650 µg/L 1.6% of the EPA limit 60 µg/L worst single sample: 1.04 µg/L	11/16	SYR4	2012–2019
Barium	24.1 µg/L 1.2% of the EPA limit 2000 µg/L worst single sample: 25 µg/L	10/10	SYR4	2014–2017
Nitrate-Nitrite	4400 µg/L 44% of the EPA limit 10000 µg/L	10/10	SYR4	2014–2017
Chromium	2.22 µg/L 2.2% of the EPA limit 100 µg/L worst single sample: 2.3 µg/L	9/10	SYR4	2014–2017
Dichloroacetic Acid	0.7200 µg/L No EPA limit set worst single sample: 0.8400 µg/L	6/16	SYR4	2012–2019
Dibromoacetic Acid	0.3880 µg/L No EPA limit set worst single sample: 0.4000 µg/L	5/16	SYR4	2012–2019
Bromodichloromethane	1.0595 µg/L No EPA limit set worst single sample: 1.1 µg/L	4/53	SYR4	2012–2019
Dibromochloromethane	0.9480 µg/L No EPA limit set worst single sample: 0.9600 µg/L	4/53	SYR4	2012–2019
Gross Alpha, Excl. Radon And U	3.9175 pCi/L 26% of the EPA limit 15 pCi/L worst single sample: 4.03 pCi/L	4/4	SYR4	2013–2014
Chloroform	1.088 µg/L No EPA limit set worst single sample: 1.1 µg/L	3/53	SYR4	2012–2019
Thallium, Total	0.2000 µg/L 10% of the EPA limit 2 µg/L	1/10	SYR4	2014–2017

86 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBeryllium, TotalBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDinosebDiquatEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Frequently asked questions about Waunakee Waterworks

Is Waunakee Waterworks tap water safe to drink?

EPA monitoring detected 18 contaminants in Waunakee 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 Waunakee Waterworks's water?

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

How many people does Waunakee Waterworks serve?

Waunakee Waterworks reports serving 14,879 people, per its EPA record.

Has Waunakee Waterworks had any water quality violations?

The EPA has 31 violations on file for Waunakee 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.