City water profile
Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Edwardsville, Illinois.
Median indexed hardness
267PPM
2 indexed ZIPs
Range 264.5–269 PPM
City summary
Edwardsville has 2 published ZIP profiles across Madison County. The indexed median is 267 PPM, compared with 285 PPM across Illinois.
Among the 913 Illinoiscities with an indexed median, Edwardsville ranks #597from highest to lowest. Across all 1,065 state ZIP profiles, available estimates run from 115to 408 PPM.
The 264.5–269 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: Jun 2, 2016 to Aug 23, 2023.
ZIP directory
Open a ZIP for site-level provenance and measurements.
Public water systems
PWSID IL1190250
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID IL1190260
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID IL1190270
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 |
|---|---|---|---|
| Total Haloacetic Acids (HAA5) | IL1190270 | Jan 1, 2026 | Archived |
| TTHM | IL1190270 | Jan 1, 2026 | Archived |
| Lead and Copper Rule | IL1190260 | Oct 1, 2025 | Resolved |
| TTHM | IL1190270 | Oct 1, 2025 | Archived |
| Total Haloacetic Acids (HAA5) | IL1190270 | Oct 1, 2025 | Archived |
| Consumer Confidence Rule | IL1190250 | Jul 1, 2025 | Resolved |
| TTHM | IL1190270 | Jul 1, 2025 | Archived |
| Total Haloacetic Acids (HAA5) | IL1190270 | Jul 1, 2025 | Archived |
| Lead and Copper Rule | IL1190270 | Jul 1, 2025 | Unaddressed |
| Lead and Copper Rule | IL1190270 | Apr 1, 2025 | Unaddressed |
Practical next steps
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Questions people ask
The indexed city median is 267 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.