Water Quality Report
Mequon, WI
Ozaukee County · 16,344 residents · 25 water systems
4
Contaminants detected
0
PFAS compounds
—
Hardness (mg/L)
0
Above legal limits
17
Above health guidelines
Mequon drinking water comes from a mix of groundwater and surface water sources. Based on the most recent monitoring data, 4 contaminants have been detected in the water supply, including Lead, Copper, Total Trihalomethanes, Haloacetic Acids (HAA5). PFAS testing has been conducted with no detections.
Contaminants detected in Mequon water
Detection does not necessarily mean unsafe levels. See individual reports for concentrations and EPA limits.
Lead0.00052 / 0.015 mg/L
3% of EPA limit
Copper10 / 1300 ug/L
1% of EPA limit
Total Trihalomethanes10.3 / 80 ug/L
13% of EPA limit
Haloacetic Acids (HAA5)3.5 / 60 ug/L
6% of EPA limit
PFAS (tested — none detected)
Microplastics (not routinely tested)
Water systems serving Mequon
MEQUON WATER UTILITY
11,152 servedSurface water4 contaminants1 above guideline
CONCORDIA UNIVERSITY
1,500 servedGroundwater0 contaminants1 above guideline
MEQUON TRAIL TOWNHOMES
615 servedGroundwater0 contaminants
HUNTINGTON PARK
600 servedGroundwater0 contaminants1 above guideline
WESTCHESTER LAKES SUBDIVISION
300 servedGroundwater0 contaminants1 above guideline
PARK PLACE SUBDIVISION
260 servedGroundwater0 contaminants1 above guideline
BRIGHTON RIDGE SUBDIVISION
200 servedGroundwater0 contaminants
HADDONSTONE SUBDIVISION
195 servedGroundwater0 contaminants1 above guideline
COUNTRY TERRACE CONDO HOMES
160 servedGroundwater0 contaminants1 above guideline
VINTAGE ESTATES
130 servedGroundwater0 contaminants
KENILWORTH SUBD
120 servedGroundwater0 contaminants
MEQUON ON THE SQUARE CONDOMINIUM OWNERS ASSOCIATION INC
110 servedGroundwater0 contaminants1 above guideline
RAVINE FARMS HM OWNERS ASSOC
100 servedGroundwater0 contaminants1 above guideline
RIVER LAKE SUBDIVISION
100 servedGroundwater0 contaminants
WYNGATE SUBDIVISION
100 servedGroundwater0 contaminants1 above guideline
WOODRIDGE ESTATES
100 servedGroundwater0 contaminants
HIGHLAND COLONY ESTATES CONDO
88 servedGroundwater0 contaminants1 above guideline
RIVER TRAILS ESTATES WATER USERS
84 servedGroundwater0 contaminants1 above guideline
LAKE COUNTRY APARTMENTS
84 servedGroundwater0 contaminants
WILLOW GLEN APARTMENTS
80 servedGroundwater0 contaminants1 above guideline
MEQUON COLONY ESTATES
75 servedGroundwater0 contaminants1 above guideline
ELM GROVE TERRACE
75 servedGroundwater0 contaminants1 above guideline
MEQUON PARC APARTMENTS LLC
60 servedGroundwater0 contaminants1 above guideline
VILLAGE GLEN APTS
30 servedGroundwater0 contaminants1 above guideline
MEQUON WATER TRUST
26 servedGroundwater0 contaminants
Other cities in Ozaukee County
Water quality reports for nearby Wisconsin communities.
Frequently asked questions
Is Mequon, WI tap water safe to drink?
Mequon tap water meets EPA legal standards (Maximum Contaminant Levels). However, 17 contaminants are present above independent health guidelines, which are often stricter than legal limits. 4 contaminants have been detected in the water supply, including Lead, Copper, Total Trihalomethanes, Haloacetic Acids (HAA5). View the detailed report for each water system to see specific levels and how they compare to both legal limits and health guidelines.
What contaminants are in Mequon water?
Monitoring has detected 4 contaminants in Mequon's water supply: Lead, Copper, Total Trihalomethanes, Haloacetic Acids (HAA5). 17 exceed health guidelines. See individual system reports for concentrations relative to EPA limits.
Does Mequon water have PFAS?
Mequon's water has been tested for PFAS compounds with no detections. Testing was conducted as part of the EPA's Unregulated Contaminant Monitoring Rule (UCMR5) program.
Where does Mequon get its drinking water?
Mequon's drinking water comes from a combination of groundwater and surface water sources. The water is treated and tested according to Wisconsin DNR and EPA requirements before distribution. Mequon is served by 25 water systems, the largest being MEQUON WATER UTILITY (serving 11,152 people).
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