City water profile
Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Mequon, Wisconsin.
Median indexed hardness
242PPM
2 indexed ZIPs
Range 242–242 PPM
City summary
Mequon has 2 published ZIP profiles across Ozaukee County. The indexed median is 242 PPM, compared with 288 PPM across Wisconsin.
Among the 479 Wisconsincities with an indexed median, Mequon ranks #388from highest to lowest. Across all 556 state ZIP profiles, available estimates run from 41.3to 467 PPM.
The 242–242 PPM range shows how much the available ZIP estimates vary within the city label.
Hardness distribution
2 of 2 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.
Evidence quality
Confidence labels
Observation window: Apr 12, 2016 to Jun 10, 2026.
ZIP directory
Open a ZIP for site-level provenance and measurements.
Public water systems
PWSID WI2460112
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID WI2460118
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID WI2460817
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID WI2460151
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID WI2460794
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID WI2460791
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID WI2460066
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID WI2460982
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID WI2460973
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID WI2460694
The system names this served city; Census place overlap links the city to this ZCTA.
Compliance history
No active health-based violation appears among the associated systems in the represented EPA reporting quarter. This does not mean every contaminant was tested at every tap.
| Record | System | Period | Status |
|---|---|---|---|
| LEAD AND COPPER RULE REVISIONS | WI2460118 | Jul 2, 2025 | Resolved |
| LEAD AND COPPER RULE REVISIONS | WI2460824 | Jul 2, 2025 | Resolved |
| LEAD AND COPPER RULE REVISIONS | WI2460132 | Jul 2, 2025 | Unaddressed |
| Lead and Copper Rule | WI2460791 | Jan 1, 2025 | Resolved |
| Lead and Copper Rule | WI2460824 | Jan 1, 2025 | Resolved |
| Public Notice | WI2460817 | Oct 17, 2024 | Unaddressed |
| Public Notice | WI2460817 | Oct 17, 2024 | Unaddressed |
| LEAD AND COPPER RULE REVISIONS | WI2460817 | Oct 17, 2024 | Resolved |
| LEAD AND COPPER RULE REVISIONS | WI2460817 | Oct 17, 2024 | Resolved · health-based |
| LEAD AND COPPER RULE REVISIONS | WI2460982 | Oct 17, 2024 | Resolved |
Practical next steps
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Questions people ask
The indexed city median is 242 PPM. Open the ZIP report to verify the distance and confidence behind that estimate.
Compliance history is utility-wide and cannot guarantee conditions at every tap. Check current notices and test when address-specific evidence is needed.
Choose treatment only after confirming the problem at the property. A softener targets hardness; contaminant treatment requires a matching, verified performance claim.