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Tap water quality report

Mequon Colony Estates

EPA monitoring tested this supplier for 68 contaminants and detected 8. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

68
contaminants tested
8
detected
75
people served
0
health-based violations
Wisconsin rankingsLead in WisconsinPFAS in Wisconsin
Water source
Ground water
Ownership
Private
Counties served
Ozaukee

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.

0
health-based violations
50
violations on file
1
still open
ViolationTypeStatusPeriod
RPT Monitoring Unaddressed 2025-07-02
Other Monitoring Resolved 2018-07-01
Other Monitoring Resolved 2018-07-01
Other Monitoring Resolved 2018-07-01
Other Monitoring Resolved 2018-07-01
Other Monitoring Resolved 2017-07-01
Other Monitoring Resolved 2017-07-01
Other Monitoring Resolved 2017-07-01
Other Monitoring Resolved 2017-07-01
Other Monitoring Resolved 2017-07-01

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Lead
0.00067 mg/L 4.5%
of the EPA limit 0.0150 mg/L
 14/14 LCR 2024
Copper
44.8 µg/L 3.4%
of the EPA limit 1300 µg/L
worst single sample: 48 µg/L
9/15 SYR4 2012–2018
Lead
1.0536 µg/L 7%
of the EPA limit 15 µg/L
worst single sample: 1.09 µg/L
3/15 SYR4 2012–2018
Combined Radium (-226 And -228)
3.1255 pCi/L 63%
of the EPA limit 5 pCi/L
worst single sample: 3.2 pCi/L
2/2 SYR4 2012–2015
Gross Alpha, Excl. Radon And U
1.6795 pCi/L 11%
of the EPA limit 15 pCi/L
worst single sample: 1.71 pCi/L
2/2 SYR4 2012–2015
Barium
23.7 µg/L 1.2%
of the EPA limit 2000 µg/L
 1/1 SYR4 2018
Chromium
2.02 µg/L 2%
of the EPA limit 100 µg/L
 1/1 SYR4 2018
Fluoride
460 µg/L 12%
of the EPA limit 4000 µg/L
 1/1 SYR4 2018
60 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformDichloromethaneDalaponDibromochloromethaneDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNitrateNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Frequently asked questions about Mequon Colony Estates

Is Mequon Colony Estates tap water safe to drink?

EPA monitoring detected 8 contaminants in Mequon Colony Estates'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 Mequon Colony Estates's water?

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

How many people does Mequon Colony Estates serve?

Mequon Colony Estates reports serving 75 people in Wisconsin, per its EPA record.

Has Mequon Colony Estates had any water quality violations?

The EPA has 50 violations on file for Mequon Colony Estates, of which 0 are health-based (a contaminant limit or required treatment was breached) and 1 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.