Is Markesan Waterworks Tap Water Safe? Quality Report

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

Compliance record

No violations on file. The EPA has no formal drinking-water violations recorded for this supplier.

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
Nitrate	9100 µg/L 91% of the EPA limit 10000 µg/L worst single sample: 9900 µg/L	76/76	SYR4	2012–2019
Copper	151 µg/L 12% of the EPA limit 1300 µg/L worst single sample: 170 µg/L	20/20	SYR4	2014–2017
Lead	5.96 µg/L 40% of the EPA limit 15 µg/L worst single sample: 7.1 µg/L	20/20	SYR4	2014–2017
Lead	0.0071 mg/L 47% of the EPA limit 0.0150 mg/L	14/14	LCR	2023
Total Haloacetic Acids (HAA5)	0.5595 µg/L 0.9% of the EPA limit 60 µg/L worst single sample: 0.5700 µg/L	8/8	SYR4	2013–2019
TTHM	3.52 µg/L 4.4% of the EPA limit 80 µg/L worst single sample: 3.55 µg/L	7/8	SYR4	2013–2019
Dibromoacetic Acid	0.5240 µg/L No EPA limit set worst single sample: 0.5400 µg/L	5/8	SYR4	2013–2019
Barium	84.25 µg/L 4.2% of the EPA limit 2000 µg/L worst single sample: 85 µg/L	4/4	SYR4	2014–2017
Bromoform	1.0475 µg/L No EPA limit set worst single sample: 1.1 µg/L	4/8	SYR4	2013–2019
Dibromochloromethane	1.285 µg/L No EPA limit set worst single sample: 1.3 µg/L	4/8	SYR4	2013–2019
Nitrate-Nitrite	8420 µg/L 84% of the EPA limit 10000 µg/L worst single sample: 8600 µg/L	4/4	SYR4	2014–2017
Bromodichloromethane	0.9770 µg/L No EPA limit set worst single sample: 0.9800 µg/L	3/8	SYR4	2013–2019
Fluoride	128 µg/L 3.2% of the EPA limit 4000 µg/L worst single sample: 130 µg/L	3/4	SYR4	2014–2017
Combined Radium (-226 And -228)	1.3875 pCi/L 28% of the EPA limit 5 pCi/L worst single sample: 1.4 pCi/L	2/2	SYR4	2014
Dichloroacetic Acid	0.1800 µg/L No EPA limit set	1/8	SYR4	2013–2019

58 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, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformChromiumDichloromethaneDalaponDinosebDiquatEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

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Frequently asked questions about Markesan Waterworks

Is Markesan Waterworks tap water safe to drink?

EPA monitoring detected 15 contaminants in Markesan 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 Markesan Waterworks's water?

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

How many people does Markesan Waterworks serve?

Markesan Waterworks reports serving 1,365 people in Wisconsin, per its EPA record.

Has Markesan Waterworks had any water quality violations?

The EPA has no formal drinking-water violations on file for Markesan Waterworks.

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.