Water Hardness in Utah
Is Utah Water Hard or Soft?
Utah water is very hard on average at 290 PPM (16.9 GPG). Local readings can vary by utility, aquifer, treatment plant, and private well use.
87% of covered ZIPs use treated-water records or USGS monitoring, so the state report has relatively strong source support.
How to read the Utah results
State pages are screening and comparison hubs. They summarize ZIP, city, and water-system patterns so you can find the local page that best matches your home or utility.
Use the source coverage below to judge how much local confirmation a specific city or ZIP needs. The methodology page explains the source hierarchy, weighting, and limitations.
Data Source Coverage
ZIP-level source mix for Utah; higher direct and USGS coverage means less reliance on regional estimates.
In Utah, 52% of ZIPs use verified treated-water records, 35% use high-confidence USGS monitoring, and 13% use estimates that should be confirmed locally for treatment decisions.
What the Data Shows in Utah
Hard or very hard water is widespread in Utah, covering 89% of classified ZIPs.
Utah has unusually strong treated-water coverage: 52% of ZIPs use utility, CCR, or state treated-water records.
Use the city table below to compare local results. For estimated locations or unusually high readings, confirm with your utility or a home hardness test before sizing treatment equipment.
ZIP Hardness Distribution
Treatment Takeaway
For many homes in Utah, hardness is high enough that scale buildup, fixture spotting, and appliance wear are realistic concerns. A local test is the best starting point before sizing a softener.
How to Use This Data
The source coverage is relatively strong in Utah, so these pages are useful for comparing local patterns before confirming your home's exact hardness.
Source-Backed Water Systems in Utah
Large systems with treated-water reports or USGS monitoring behind the state rollup.
| Water system | Hardness | Source label | Population |
|---|---|---|---|
| St George City Water System UTAH27015 - Washington County | 342 PPM Very Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 105,240 |
| Washington City UTAH27021 - Washington County | 342 PPM Very Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 45,865 |
| Hurricane City UTAH27007 - Washington County | 342 PPM Very Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 25,555 |
| Ivins UTAH27008 - Washington County | 342 PPM Very Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 10,465 |
| Hildale - Colorado City UTAH27006 - Washington County | 342 PPM Very Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 6,100 |
| Sl County Service Area No 3 - Snowbird UTAH18031 - Salt Lake County | 200 PPM Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 5,110 |
| Mountain Green Mutual Water Company UTAH15046 - Morgan County | 200 PPM Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 3,500 |
| Diamond Valley Acres UTAH27065 - Washington County | 342 PPM Very Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 1,340 |
Useful Utah City Pages
Shortcuts to city pages backed by more ZIP-code or water-system data.
Cities With More Local Data
Prioritize cities with multiple ZIPs and systems, then use source badges on each city page to separate verified treated-water records from estimates.
Top 10 Hardest Water Cities
| # | City | Hardness |
|---|---|---|
| 1 | Castle Dale | Very Hard (1125 PPM) |
| 2 | Big Water | Very Hard (963 PPM) |
| 3 | Hurricane | Very Hard (347 PPM) |
| 4 | La Verkin | Very Hard (344 PPM) |
| 5 | Corinne | Very Hard (343 PPM) |
| 6 | Toquerville | Very Hard (343 PPM) |
| 7 | Virgin | Very Hard (343 PPM) |
| 8 | Washington | Very Hard (342 PPM) |
| 9 | Central | Very Hard (342 PPM) |
| 10 | Pine Valley | Very Hard (342 PPM) |
Top 10 Softest Water Cities
| # | City | Hardness |
|---|---|---|
| 1 | Clearfield | Hard (194 PPM) |
| 2 | Kaysville | Hard (195 PPM) |
| 3 | Moab | Hard (198 PPM) |
| 4 | Woods Cross | Hard (198 PPM) |
| 5 | Eden | Hard (200 PPM) |
| 6 | Alpine | Hard (200 PPM) |
| 7 | American Fork | Hard (200 PPM) |
| 8 | Bingham Canyon | Hard (200 PPM) |
| 9 | Bountiful | Hard (200 PPM) |
| 10 | Cedar Valley | Hard (200 PPM) |
All Cities in Utah
City pages marked Estimated use fallback values and should be confirmed with local testing or utility data.