Is Monroe Waterworks Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Local government
Counties served: Green

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
MCL	Health-based	Resolved	2014-07-01 → 2014-07-31
MCL	Health-based	Resolved	2014-07-01 → 2014-07-31
MCL	Health-based	Resolved	2014-07-01 → 2014-07-31
MCL	Health-based	Resolved	2014-07-01 → 2014-07-31
MCL	Health-based	Resolved	2010-09-01 → 2010-09-30
MCL	Health-based	Resolved	2010-09-01 → 2010-09-30
MCL	Health-based	Resolved	2010-09-01 → 2010-09-30
MCL	Health-based	Resolved	2010-09-01 → 2010-09-30
MCL	Health-based	Resolved	2010-09-01 → 2010-09-30
MCL	Health-based	Resolved	1998-07-01 → 1998-07-31

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
Fluoride	1090 µg/L 27% of the EPA limit 4000 µg/L worst single sample: 1390 µg/L	106/202	SYR4	2012–2019
Copper	181 µg/L 14% of the EPA limit 1300 µg/L worst single sample: 560 µg/L	60/60	SYR4	2014–2017
Lead	14 µg/L 93% of the EPA limit 15 µg/L worst single sample: 33 µg/L	57/60	SYR4	2014–2017
Combined Radium (-226 And -228)	8.605 pCi/L 172% of the EPA limit, at the 95th percentile of samples — 5 pCi/L worst single sample: 9.45 pCi/L	34/34	SYR4	2012–2017
Nitrate	545.5 µg/L 5.5% of the EPA limit 10000 µg/L worst single sample: 640 µg/L	30/60	SYR4	2012–2019
Lead	0.0047 mg/L 31% of the EPA limit 0.0150 mg/L	16/16	LCR	2023
Gross Alpha, Excl. Radon And U	10.7 pCi/L 71% of the EPA limit 15 pCi/L worst single sample: 14.6 pCi/L	13/13	SYR4	2013–2017
TTHM	5.79 µg/L 7.2% of the EPA limit 80 µg/L worst single sample: 6.03 µg/L	13/15	SYR4	2012–2019
Chloroform	4.445 µg/L No EPA limit set worst single sample: 4.5 µg/L	12/41	SYR4	2012–2019
Barium	102.55 µg/L 5.1% of the EPA limit 2000 µg/L worst single sample: 130 µg/L	10/10	SYR4	2014–2017
Total Haloacetic Acids (HAA5)	0.7066 µg/L 1.2% of the EPA limit 60 µg/L worst single sample: 0.8070 µg/L	9/15	SYR4	2012–2019
Dibromochloromethane	1.34 µg/L No EPA limit set worst single sample: 1.4 µg/L	7/41	SYR4	2012–2019
Nitrate-Nitrite	229 µg/L 2.3% of the EPA limit 10000 µg/L worst single sample: 250 µg/L	7/10	SYR4	2014–2017
Bromodichloromethane	1.475 µg/L No EPA limit set worst single sample: 1.5 µg/L	6/41	SYR4	2012–2019
Combined Uranium	1.19 µg/L 4% of the EPA limit 30 µg/L worst single sample: 1.2 µg/L	6/6	SYR4	2013–2017
Dichloroacetic Acid	0.4870 µg/L No EPA limit set worst single sample: 0.5000 µg/L	3/15	SYR4	2012–2019
Bromoform	0.7635 µg/L No EPA limit set worst single sample: 0.7700 µg/L	2/41	SYR4	2012–2019
Arsenic	2.3 µg/L 23% of the EPA limit 10 µg/L	1/10	SYR4	2014–2017
Toluene	3.9 µg/L 0.4% of the EPA limit 1000 µg/L	1/27	SYR4	2012–2017
Trichloroacetic Acid	0.4400 µg/L No EPA limit set	1/15	SYR4	2012–2019

87 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAtrazineBhc-GammaBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDibromoacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

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Frequently asked questions about Monroe Waterworks

Is Monroe Waterworks tap water safe to drink?

EPA monitoring detected 20 contaminants in Monroe 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 Monroe Waterworks's water?

EPA monitoring detected Fluoride, Copper, Lead, Combined Radium (-226 And -228), Nitrate, and others. The full list with the level and data source for each is above.

How many people does Monroe Waterworks serve?

Monroe Waterworks reports serving 10,780 people in Wisconsin, per its EPA record.

Has Monroe Waterworks had any water quality violations?

The EPA has 29 violations on file for Monroe Waterworks, of which 19 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.