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EPA SDWIS High-volume analyte Dense per-system load

Combined Radium (-226 and -228) in Drinking Water

22.3 violations per affected system (142,845 across 6,396) - dense load (> 5.8 violations per affected system).

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EPA contaminant code: 4010

Total Violations
142,845
Systems Affected
6,396
Health-Based %
44.5%
Violations / System
22.3

Combined Radium (-226 and -228) standing, high-volume SDWIS third

Combined Radium (-226 and -228) sits in the upper third of this extract by raw violation count (142,845), so the national record is thick enough that system-level lists below are a sample of a much larger compliance trail rather than a near-complete inventory. Load is concentrated: 22.3 violations per affected system (dense load (> 5.8 violations per affected system)), which usually means repeat findings on the same PWSIDs rather than one-off detections spread thin. Health-based share is 44.5% - a material slice of the record is exposure-relevant, with the rest monitoring or reporting. Among 157 indexable contaminants, this page is #13 by violation volume. Utilities listed below are ranked by cumulative violation count for this analyte; pair that with population served to gauge household exposure scale.

Nationwide similar contaminants

Nearest by violation volume

Gross Alpha, Excl. Radon and U (137,468) Surface Water Treatment Rule (165,477) Arsenic (171,997) Radium-228 (113,334)

Nearest by systems affected

Total Polychlorinated Biphenyls (PCB) (6,785 systems) 1,2-DIBROMO-3-CHLOROPROPANE (6,889 systems) Diquat (5,771 systems) Nitrate-Nitrite (5,756 systems)

Combined Radium (-226 and -228): mixed health vs monitoring split

44.5% health-based · 55.5% monitoring/reporting across 142,845 records.

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

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

Context: understanding water quality data · is my water safe?

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

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.