PlainWater
Contaminants →
EPA SDWIS High-volume analyte Dense per-system load

Gross Alpha, Excl. Radon and U in Drinking Water

9.3 violations per affected system (137,468 across 14,784) - dense load (> 5.8 violations per affected system).

Browse all SDWIS contaminants →

EPA contaminant code: 4000

Total Violations
137,468
Systems Affected
14,784
Health-Based %
24.1%
Violations / System
9.3

Gross Alpha, Excl. Radon and U standing, high-volume SDWIS third

Gross Alpha, Excl. Radon and U sits in the upper third of this extract by raw violation count (137,468), 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: 9.3 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 24.1% - a material slice of the record is exposure-relevant, with the rest monitoring or reporting. Among 157 indexable contaminants, this page is #14 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

Combined Radium (-226 and -228) (142,845) Radium-228 (113,334) Surface Water Treatment Rule (165,477) Radium-226 (108,989)

Nearest by systems affected

Carbon tetrachloride (14,788 systems) 1,1-Dichloroethylene (14,743 systems) 1,1,1-Trichloroethane (14,739 systems) Trichloroethylene (14,829 systems)

Gross Alpha, Excl. Radon and U: mixed health vs monitoring split

24.1% health-based · 75.9% monitoring/reporting across 137,468 records.

Health-based (24.1%) Monitoring/Reporting (75.9%)

Most Affected Water Systems

System State Violations Population
City of Brady Water System TX 1,426 5,371
Waukesha Water Utility WI 1,301 70,718
May Valley WA CO 687 1,500
West Jackson Co Utility Dist MS 489 28,544
Millersview Doole WSC TX 455 3,987
Tempe WSC 1 TX 445 2,725
City of Biloxi MS 420 23,310
Abraxas Utilities TX 413 792
Council Creek Village TX 387 333
South Silver Creek I II & III TX 374 291
City of Melvin TX 362 300
San Pedro Canyon Subdivision - Upper TX 342 150
Circle H MHP NC 339 68
City of Gulfport MS 336 75,056
Live Oak Hills Subdivision TX 334 65
Keesler Air Force Base MS 312 8,006
City of Long Beach MS 310 18,514
Town of Aberdeen MS 308 7,783
Tunica County Utility District MS 308 6,690
Abraxas Utilities TX 308 792
Biggsville IL 307 273
City of Corinth MS 280 15,000
City of Greenville MS 280 29,602
Eastside MHP OK 268 32
Valley WC CO 257 270
City of Mason TX 256 2,228
Clarksdale Public Utilities MS 252 14,903
City of Clinton MS 252 25,000
Valley Estates TX 252 68
City of Gautier MS 245 22,253

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.