Water Quality Report
Mequon, WI
Ozaukee County · 16,344 residents · 25 water systems
4
Contaminants detected
0
PFAS compounds
288
Hardness (mg/L)
0
Above legal limits
51
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. Water hardness is 288 mg/L (very hard), which can cause scale buildup in appliances and reduce soap effectiveness.
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
Copper47 / 1300 ug/L
4% of EPA limit
Total Trihalomethanes8.7 / 80 ug/L
11% of EPA limit
Haloacetic Acids (HAA5)3.7 / 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 servedGroundwater10 contaminants3 above guidelines
MEQUON TRAIL TOWNHOMES
615 servedGroundwater9 contaminants1 above guideline
HUNTINGTON PARK
600 servedGroundwater14 contaminants3 above guidelines
WESTCHESTER LAKES SUBDIVISION
300 servedGroundwater10 contaminants2 above guidelines
PARK PLACE SUBDIVISION
260 servedGroundwater13 contaminants3 above guidelines
BRIGHTON RIDGE SUBDIVISION
200 servedGroundwater10 contaminants1 above guideline
HADDONSTONE SUBDIVISION
195 servedGroundwater8 contaminants3 above guidelines
COUNTRY TERRACE CONDO HOMES
160 servedGroundwater14 contaminants3 above guidelines
VINTAGE ESTATES
130 servedGroundwater8 contaminants3 above guidelines
KENILWORTH SUBD
120 servedGroundwater10 contaminants1 above guideline
MEQUON ON THE SQUARE CONDOMINIUM OWNERS ASSOCIATION INC
110 servedGroundwater11 contaminants2 above guidelines
RAVINE FARMS HM OWNERS ASSOC
100 servedGroundwater10 contaminants3 above guidelines
RIVER LAKE SUBDIVISION
100 servedGroundwater12 contaminants2 above guidelines
WYNGATE SUBDIVISION
100 servedGroundwater10 contaminants3 above guidelines
WOODRIDGE ESTATES
100 servedGroundwater10 contaminants1 above guideline
HIGHLAND COLONY ESTATES CONDO
88 servedGroundwater9 contaminants2 above guidelines
RIVER TRAILS ESTATES WATER USERS
84 servedGroundwater10 contaminants3 above guidelines
LAKE COUNTRY APARTMENTS
84 servedGroundwater9 contaminants1 above guideline
WILLOW GLEN APARTMENTS
80 servedGroundwater7 contaminants2 above guidelines
MEQUON COLONY ESTATES
75 servedGroundwater10 contaminants1 above guideline
ELM GROVE TERRACE
75 servedGroundwater6 contaminants1 above guideline
MEQUON PARC APARTMENTS LLC
60 servedGroundwater12 contaminants2 above guidelines
VILLAGE GLEN APTS
30 servedGroundwater7 contaminants2 above guidelines
MEQUON WATER TRUST
26 servedGroundwater11 contaminants2 above guidelines
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, 51 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). 51 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.
Is Mequon water hard?
Yes. Mequon water has a hardness of 288 mg/L (very hard). Hard water is not a health concern but can cause scale buildup in water heaters and appliances, reduce soap effectiveness, and leave mineral deposits. Water softeners or conditioning systems can address hardness.
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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