waterbycounty
Compiled federal source snapshot

Utah Water Quality

Drinking water data for all 29 counties.

Avg SDWIS Compliance Index

47.0

Most Common Five-Year SDWIS Compliance Band

F

Counties with Data

29

of 29 total

County water atlas

Utah water signals by county

A state-level 2.5D view across drinking-water compliance, watershed impairment, monitoring density, and streamflow snapshot context. Pin any county, switch layers, then use the lens controls to compare index ranges, recorded violation rates, or impaired watersheds without leaving the page.

Counties

29

Avg SDWIS index

47.0

Watersheds

0

ATTAINS counties

Monitoring

29

27 fresh USGS snapshots

State atlas layers combine EPA SDWIS health-based violations, EPA ATTAINS 303(d) impairment assessments, EPA Water Quality Portal monitoring sites, and representative USGS NWIS streamflow gauges. Streamflow values appear only for fresh pipeline snapshots, not as a continuously updated stream. County pages include the observation time and year.

Prepared by ByCounty Editorial TeamPublished by WaterByCounty

Multi-source coverage in Utah

Beyond Drinking Water

EPA SDWIS

29/ 29

counties with drinking-water compliance data

184 health violations statewide (5yr)

EPA ATTAINS

—

No §303(d) assessments yet for Utah

EPA WQP

2,317

monitoring sites across 29 counties

897,312 total readings (5yr window)

USGS NWIS

27

counties with a fresh pipeline snapshot

2 above24 below

State atlas notes

What stands out in Utah

County water quality is not one number. The strongest read comes from comparing drinking-water compliance against watershed impairment, monitoring density, and streamflow context. Use these signals as a starting point, then open any county profile for source-level detail.

Compliance spread

Beaver County has the highest value in the published state SDWIS Compliance Index table at 86.2/100, while Rich County has the lowest at 5.8/100. That is a 80.4 point gap inside one state.

Zero health violations

5

3+ health violations

17

Monitoring hubs

Salt Lake County232 sitesUtah County179 sitesSummit County177 sites

Lowest flow reads

Garfield County0%Tooele County0%Kane County2%

Highest fresh streamflow pipeline snapshots: Summit County (155%, observation 2026), Salt Lake County (120%, observation 2026), Juab County (92%, observation 2026). These are source-data observations, not household tap-water conclusions.

All Utah Counties

CountySDWIS Compliance Index
Beaver County86.2
Daggett County86.2
Juab County86.2
Tooele County86.2
Uintah County86.2
Salt Lake County71.9
Davis County69.8
Utah County63.8
Box Elder County62.3
Sevier County58.3
Weber County55.9
Cache County55.4
Washington County50.8
Duchesne County49.1
Carbon County48.9
Sanpete County44.5
Morgan County39.9
Summit County38.7
Wayne County32.7
Iron County29.5
Grand County27.8
Kane County25.8
Emery County24.0
San Juan County22.6
Wasatch County18.9
Garfield County12.5
Millard County12.1
Piute County9.8
Rich County5.8

Frequently Asked Questions

Which Utah county has the highest SDWIS Compliance Index?
Beaver County has the highest SDWIS Compliance Index in the published Utah cohort at 86.2/100. This WaterByCounty relative comparison is not an EPA score and does not establish current conditions for a utility or address.
What does the Five-Year SDWIS Compliance Band mean?
The band is derived only from each county aggregation's recorded health-violation rate per 100,000 people served for the stated five-year source window. It is separate from the relative SDWIS Compliance Index and is not a current determination for a specific utility or address.
Which USGS streamflow records are shown across Utah?
WaterByCounty has 27 fresh USGS pipeline snapshots in the published Utah cohort. Each county page shows its observation timestamp and year. A pipeline snapshot is not a continuously updated reading or a tap-water safety measure.
Where can Utah residents find current official information?
Review the applicable utility's Consumer Confidence Report, active notices, and the state drinking-water agency. WaterByCounty's county-level historical aggregations do not establish the current status of a specific utility, address, private well, or household plumbing system.
What does Water Quality Portal monitoring volume show in Utah?
The published county records contain 897,312 results from 2,317 monitoring locations in the site's five-year aggregation. Monitoring volume does not by itself indicate better or worse water quality.

Data Sources

Drinking-water compliance data from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. The WaterByCounty SDWIS Compliance Index reflects the recorded rate and is not an EPA score.

Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.

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