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EPA SDWIS ~155K water systems EPA + UCMR5

Combined Uranium

EPA SDWIS quarterly extract data for this analyte. Detection counts and health-based violation counts reflect the most recent federal release.

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EPA contaminant code: 4006

Total Violations
184,297
Systems Affected
4,427
Health-Based %
10.2%
Most Affected State
-

What this means

Combined Uranium appears in EPA SDWIS with 184,297 recorded violations across 4,427 public water systems. Of those, 10.2% are classified as health-based, meaning the reading exceeded a federally enforceable Maximum Contaminant Level or a treatment-technique requirement rather than a monitoring or reporting lapse. Health-based violations are the subset that trigger formal corrective action and public notification, so the share is a useful signal of real-world exposure risk rather than paperwork drift. State-level concentration data is not consistently reported for this contaminant, so regional interpretation should lean on the system table below rather than state aggregates. Utilities listed below are ranked by cumulative violation count, so a higher rank reflects persistence in the record rather than a single spike; readers comparing systems should consider population served alongside violation count to gauge how many households were actually exposed.

Violation Type Split

Combined Uranium violations broken down by EPA classification.

Health-based (10.2%) Monitoring/Reporting (89.8%)

Health-based violations indicate the contaminant exceeded an EPA Maximum Contaminant Level (MCL) or treatment-technique requirement; monitoring/reporting violations are procedural.

Most Affected Water Systems

System State Violations Population
West Jackson Co Utility Dist MS 1,132 28,544
Town of Aberdeen MS 864 7,783
Keesler Air Force Base MS 785 8,006
Rosemount Water Co NV 582 54
City of New Albany MS 534 8,900
City of Ripley MS 532 11,351
City of Gulfport MS 502 75,056
Buckatunna Water Association MS 496 4,686
Sebastopol Water Association MS 494 6,207
City of Pontotoc MS 488 9,398
City of Corinth MS 456 15,000
Barrontown W/A MS 438 7,999
City of Biloxi MS 432 23,310
Tallahala W/A-Antioch MS 430 3,427
Wren W/A MS 430 3,068
North Lee W/a #1-Barnes Crosng MS 428 2,672
Smiths Crossing Water Assn MS 420 4,480
City of Ocean Springs MS 416 26,168
City of Greenville MS 416 29,602
Tunica County Utility District MS 405 6,690
City of Forest MS 402 5,430
Harrisville W/A MS 384 1,967
City of Senatobia MS 380 8,354
Gulf Park MS 379 4,813
Mooreville-Richmond W/a #1 MS 377 3,807
J P Utility District MS 360 3,839
Riviera Wcid TX 358 729
Shady Grove Utility District MS 356 2,390
Copiah-New Zion Water Assn,inc MS 352 3,791
Hub Water Association MS 352 3,260

Drinking Water Guides

Understanding Water Quality Data

What EPA SDWIS tracks, how violations are classified, and what MCLs mean.
PFAS in Drinking Water

What forever chemicals are, EPA testing results, and 2024 standards.
Is My Water Safe?

How to assess your local water quality and when to take precautions.

Frequently Asked Questions

What is Combined Uranium in drinking water? ▼
Combined Uranium is a contaminant tracked by the EPA under the Safe Drinking Water Act. It has caused 184,297 violations across 4,427 public water systems nationwide. 10.2% of these violations are health-based, meaning the contaminant exceeded Maximum Contaminant Levels (MCLs) or treatment technique requirements.
How many water systems have Combined Uranium violations? ▼
4,427 public water systems across the United States have at least one Combined Uranium violation recorded in the EPA SDWIS database.
Are Combined Uranium violations dangerous? ▼
10.2% of Combined Uranium violations are health-based, meaning the contaminant level exceeded safe limits set by the EPA. Health-based violations require corrective action by the water system. Not all violations indicate immediate health risk, but they signal that water quality standards were not met.
Which state has the most Combined Uranium violations? ▼
State-level breakdown data is not available for this contaminant.
Where does this contaminant data come from? ▼
All violation data comes from the EPA Safe Drinking Water Information System (SDWIS), which tracks compliance for all public water systems regulated under the Safe Drinking Water Act. SDWIS records violations including Maximum Contaminant Level (MCL) exceedances, treatment technique failures, and monitoring/reporting issues.

Data Sources

Contaminant violation data from the EPA Safe Drinking Water Information System (SDWIS). Violations are categorized as health-based (Maximum Contaminant Level exceedances, treatment technique failures) or monitoring/reporting violations.

Related

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Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the EPA Safe Drinking Water Information System (SDWIS). Consult a qualified professional before making decisions based on this data.

Read our methodology - how this data is sourced, computed, and verified.

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.