City water profile
Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Casper, Wyoming.
Median indexed hardness
248PPM
2 indexed ZIPs
Range 224–272 PPM
City summary
Casper has 2 published ZIP profiles across Natrona County. The indexed median is 248 PPM, compared with 235 PPM across Wyoming.
Among the 86 Wyomingcities with an indexed median, Casper ranks #40from highest to lowest. Across all 97 state ZIP profiles, available estimates run from 3.2to 1905 PPM.
The 224–272 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: Jan 7, 2016 to May 29, 2026.
ZIP directory
Open a ZIP for site-level provenance and measurements.
Public water systems
PWSID WY5601415
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID WY5600069
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID WY5600079
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID WY5601231
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID WY5601641
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID WY5601339
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID WY5601622
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID WY5600969
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID WY5601581
The system names this served city; Census place overlap links the city to this ZCTA.
PWSID WY5600074
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 |
|---|---|---|---|
| Surface Water Treatment Rule | WY5601231 | Aug 1, 2025 | Resolved |
| Consumer Confidence Rule | WY5601581 | Jul 1, 2025 | Unaddressed |
| Revised Total Coliform Rule | WY5600079 | Oct 1, 2024 | Resolved |
| Surface Water Treatment Rule | WY5600079 | Oct 1, 2024 | Resolved |
| Consumer Confidence Rule | WY5601641 | Jul 1, 2024 | Resolved |
| Surface Water Treatment Rule | WY5600069 | Apr 1, 2024 | Resolved |
| Lead and Copper Rule | WY5600074 | Feb 29, 2024 | Resolved · health-based |
| Total Haloacetic Acids (HAA5) | WY5600074 | Jan 1, 2024 | Resolved |
| Lead and Copper Rule | WY5600074 | Jan 1, 2024 | Resolved · health-based |
| TTHM | WY5600074 | Jan 1, 2024 | Resolved |
Practical next steps
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Questions people ask
The indexed city median is 248 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.