City water profile
Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Potosi, Missouri.
Median indexed hardness
242PPM
2 indexed ZIPs
Range 225–259 PPM
City summary
Potosi has 2 published ZIP profiles across Washington County. The indexed median is 242 PPM, compared with 236 PPM across Missouri.
Among the 504 Missouricities with an indexed median, Potosi ranks #216from highest to lowest. Across all 556 state ZIP profiles, available estimates run from 38.3to 483 PPM.
The 225–259 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: Mar 1, 2016 to Jul 16, 2024.
ZIP directory
Open a ZIP for site-level provenance and measurements.
Public water systems
PWSID MO6010659
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 | MO6010659 | Jul 2, 2025 | Unaddressed |
| Public Notice | MO6010659 | Apr 27, 2024 | Resolved |
| Revised Total Coliform Rule | MO6010659 | Mar 1, 2023 | 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.