Water Quality: Mequon, WI
25 water systems • 16,344 people served
Multiple Health ViolationsWater Quality Summary
Mequon is served by 25 public water systems with a combined service population of 16,344 people, and has 166 EPA Safe Drinking Water Act violations on record. Critically, 9 of those are health-based violations, meaning one or more contaminants were detected above EPA-established safe levels — a serious public health concern. Mequon's violation count is 407% above the national average for Wisconsin. Contaminants associated with violations include Chlorine, Chlorine Dioxide, Stage 2 DBP.
Contaminants Found
Eye and nose irritation at high levels; long-term exposure above the MCL may cause liver and kidney damage.
Common source: Water treatment disinfectant added to kill harmful microorganisms
EPA limit: 4.0 mg/L (MRDL — Maximum Residual Disinfectant Level)
Can cause anemia in infants and young children; may cause nervous system effects at high levels.
Common source: Water treatment disinfectant used to control taste, odor, and microorganisms
EPA limit: 0.8 mg/L
Trihalomethanes and haloacetic acids that increase cancer risk and may cause adverse reproductive outcomes.
Common source: Chlorine disinfection reacting with natural organic matter in source water
EPA limit: TTHM: 0.080 mg/L; HAA5: 0.060 mg/L
Water Systems Serving Mequon
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| MEQUON WATER UTILITY | WI2460112 | Surface Water | 11,152 | 4 |
| CONCORDIA UNIVERSITY | WI2460118 | Groundwater | 1,500 | 3 |
| MEQUON TRAIL TOWNHOMES | WI2460817 | Groundwater | 615 | 15 |
| HUNTINGTON PARK | WI2460151 | Groundwater | 600 | 7 |
| WESTCHESTER LAKES SUBDIVISION | WI2460794 | Groundwater | 300 | 13 |
| PARK PLACE SUBDIVISION | WI2460066 | Groundwater | 260 | 2 |
| BRIGHTON RIDGE SUBDIVISION | WI2460973 | Groundwater | 200 | 3 |
| HADDONSTONE SUBDIVISION | WI2460694 | Groundwater | 195 | 1 |
| COUNTRY TERRACE CONDO HOMES | WI2460128 | Groundwater | 160 | 1 |
| VINTAGE ESTATES | WI2460705 | Groundwater | 130 | 4 |
| KENILWORTH SUBD | WI2460796 | Groundwater | 120 | 0 |
| MEQUON ON THE SQUARE CONDOMINIUM OWNERS ASSOCIATION INC | WI2460955 | Groundwater | 110 | 4 |
| RAVINE FARMS HM OWNERS ASSOC | WI2460124 | Groundwater | 100 | 8 |
| RIVER LAKE SUBDIVISION | WI2460685 | Groundwater | 100 | 12 |
| WYNGATE SUBDIVISION | WI2460781 | Groundwater | 100 | 5 |
| WOODRIDGE ESTATES | WI2460824 | Groundwater | 100 | 6 |
| HIGHLAND COLONY ESTATES CONDO | WI2460120 | Groundwater | 88 | 3 |
| RIVER TRAILS ESTATES WATER USERS | WI2460680 | Groundwater | 84 | 11 |
| LAKE COUNTRY APARTMENTS | WI2682229 | Groundwater | 84 | 6 |
| WILLOW GLEN APARTMENTS | WI2683555 | Groundwater | 80 | 10 |
| MEQUON COLONY ESTATES | WI2460132 | Groundwater | 75 | 21 |
| ELM GROVE TERRACE | WI2680279 | Groundwater | 75 | 2 |
| MEQUON PARC APARTMENTS LLC | WI2460159 | Groundwater | 60 | 9 |
| VILLAGE GLEN APTS | WI2460140 | Groundwater | 30 | 6 |
| MEQUON WATER TRUST | WI2460131 | Groundwater | 26 | 10 |
Concerned About Your Water?
A home water filter can remove common contaminants. NSF-certified filters are tested against EPA standards.
Consider a reverse osmosis system for comprehensive filtration or a carbon filter for basic improvement.
Other Cities in Wisconsin
Data Sources
Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). Data includes all recorded violations for active community water systems.