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EPA SDWIS ~155K water systems EPA + UCMR5

Combined Radium (-226 and -228)

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: 4010

Total Violations
142,845
Systems Affected
6,396
Health-Based %
44.5%
Most Affected State
-

What this means

Combined Radium (-226 and -228) appears in EPA SDWIS with 142,845 recorded violations across 6,396 public water systems. Of those, 44.5% 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 Radium (-226 and -228) violations broken down by EPA classification.

Health-based (44.5%) Monitoring/Reporting (55.5%)

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
City of Brady Water System TX 1,839 5,371
Brookwood Comm Wtr System NC 1,254 15,380
Waukesha Water Utility WI 1,146 70,718
May Valley WA CO 1,022 1,500
Biggsville IL 586 273
Seneca Mobile Homes LLC IL 527 10
West Jackson Co Utility Dist MS 489 28,544
Millersview Doole WSC TX 469 3,987
Kendall County Wcid 1 TX 436 3,579
City of Biloxi MS 420 23,310
Tempe WSC 1 TX 420 2,725
Naplate IL 417 465
Neponset IL 414 427
Elm Oak Mutual Water System IL 391 50
Council Creek Village TX 391 333
South Silver Creek I II & III TX 390 291
Valley WC CO 387 270
City of Melvin TX 368 300
Sussex Village Hall & Water Utility WI 361 11,750
South Swink Water Authority CO 354 622
Live Oak Hills Subdivision TX 339 65
City of Mason TX 337 2,228
City of Gulfport MS 336 75,056
Bryant IL 331 267
Edelstein Water Coop IL 330 113
Circle H MHP NC 317 68
Bronaugh PWS MO 313 245
Keesler Air Force Base MS 312 8,006
City of Long Beach MS 310 18,514
Town of Aberdeen MS 308 7,783

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 Radium (-226 and -228) in drinking water? ▼
Combined Radium (-226 and -228) is a contaminant tracked by the EPA under the Safe Drinking Water Act. It has caused 142,845 violations across 6,396 public water systems nationwide. 44.5% of these violations are health-based, meaning the contaminant exceeded Maximum Contaminant Levels (MCLs) or treatment technique requirements.
How many water systems have Combined Radium (-226 and -228) violations? ▼
6,396 public water systems across the United States have at least one Combined Radium (-226 and -228) violation recorded in the EPA SDWIS database.
Are Combined Radium (-226 and -228) violations dangerous? ▼
44.5% of Combined Radium (-226 and -228) 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 Radium (-226 and -228) 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.