EPA SDWIS ~155K water systems EPA + UCMR5

Gross Alpha, Excl. Radon and U

Compiled by PlainWater Editorial, Drinking Water Quality Editorial Team · May 15, 2026

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: 4000

Total Violations

137,468

Systems Affected

14,784

Health-Based %

24.1%

Most Affected State

What this means

Gross Alpha, Excl. Radon and U appears in EPA SDWIS with 137,468 recorded violations across 14,784 public water systems. Of those, 24.1% 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

Gross Alpha, Excl. Radon and U violations broken down by EPA classification.

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

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	1,426	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

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 Gross Alpha, Excl. Radon and U in drinking water? ▼

Gross Alpha, Excl. Radon and U is a contaminant tracked by the EPA under the Safe Drinking Water Act. It has caused 137,468 violations across 14,784 public water systems nationwide. 24.1% of these violations are health-based, meaning the contaminant exceeded Maximum Contaminant Levels (MCLs) or treatment technique requirements.

How many water systems have Gross Alpha, Excl. Radon and U violations? ▼

14,784 public water systems across the United States have at least one Gross Alpha, Excl. Radon and U violation recorded in the EPA SDWIS database.

Are Gross Alpha, Excl. Radon and U violations dangerous? ▼

24.1% of Gross Alpha, Excl. Radon and U 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 Gross Alpha, Excl. Radon and U 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.

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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.