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Combined Radium (-226 and -228) in U.S. Drinking Water

Health-based violation data for Combined Radium (-226 and -228) from EPA Safe Drinking Water Information System (SDWIS). Covers all community water systems with violations on record.

Combined Radium (-226 and -228) has been found in violation of EPA standards in 479 water systems across 40 states, with 9,524 total health-based violations recorded. The most affected states are Texas, Colorado, Missouri.

Health-Based Violation Records
9,524
Water Systems Affected
479
States Affected
40

Combined Radium (-226 and -228) is regulated under the EPA Safe Drinking Water Act, which sets enforceable Maximum Contaminant Levels (MCLs) and associated treatment technique requirements for public water systems. The EPA Safe Drinking Water Information System (SDWIS) tracks every recorded violation nationwide and links it back to the specific public water system (PWSID), violation type, and begin date.

Across the United States, PlainEnviro's joined extract contains 9,524 health-based violation records carrying Combined Radium (-226 and -228) (EPA code 4010) across 479 active community water systems in 40 states. Raw record counts are highest in Texas, Colorado, Missouri, with Texas accounting for 2,465 records across 45 systems. Health-effect prose is shown only when the official ECHO substance name matches a verified topic; otherwise the portal stays silent rather than inventing guidance.

A health-based violation does not mean residents were necessarily harmed, it means the contaminant exceeded the federal MCL in a compliance sample, triggering notification and remediation requirements. States and utilities maintain primary enforcement responsibility. To check the status of a specific water system, request its most recent Consumer Confidence Report or consult the EPA's Drinking Water Watch portal for the corresponding state.

Violations by State

States ranked by number of health-based violations for Combined Radium (-226 and -228).

# State Violations Systems Affected
1 Texas 2,465 45
2 Colorado 1,686 43
3 Missouri 1,039 27
4 Wisconsin 705 30
5 Georgia 374 22
6 Illinois 338 33
7 South Dakota 239 10
8 Minnesota 227 26
9 North Carolina 148 15
10 Vermont 136 7
11 Oklahoma 93 6
12 Iowa 90 14
13 Kansas 86 7
14 New Hampshire 81 13
15 New York 79 11
16 New Jersey 75 9
17 Wyoming 74 3
18 New Mexico 59 4
19 Florida 55 8
20 Massachusetts 55 5
21 Arizona 47 4
22 Michigan 46 9
23 Pennsylvania 33 5
24 Montana 24 1
25 Arkansas 19 2
26 Rhode Island 19 3
27 Alabama 17 3
28 Utah 17 4
29 Virginia 16 6
30 Delaware 14 3
31 Maryland 14 1
32 South Carolina 13 6
33 Connecticut 12 4
34 California 6 3
35 Tennessee 6 1
36 Mississippi 5 1
37 Nevada 3 1
38 North Dakota 2 1
39 Maine 1 1
40 Nebraska 1 1

Most Affected Water Systems

Top 50 water systems by number of Combined Radium (-226 and -228) health-based violations.

Water System State Violations
CITY OF BRADY WATER SYSTEM TX 567
WAUKESHA WATER UTILITY WI 357
MAY VALLEY WA CO 248
KENDALL COUNTY WCID 1 TX 191
CITY OF MASON TX 153
SOUTH SWINK WATER AUTHORITY CO 144
BLUE RIDGE MOBILE HOME PARK TX 128
SILEX PWS MO 123
BEEHIVE WATER ASSOCIATION CO 121
TEMPE WSC 1 TX 119
SHIRT TAIL GULCH DEVELOPMENT SD 106
SUSSEX VILLAGE HALL & WATER UTILITY WI 96
TERRE DU LAC MO 92
VALLEY WC CO 90
SOUTH SILVER CREEK I II & III MO 90
CITY OF EDEN TX 90
NORTH SAN SABA WSC TX 88
MILLERSVIEW DOOLE WSC TX 84
RIO BRAZOS WATER SYSTEM TX 82
ARIMAK WATER SUPPLY TX 79
LAKELAND SERVICES TX 79
WESTLAKE MEADOWS SUBDIVISION MO 76
CHERAW TOWN OF CO 70
HOLBROOK CENTER SOFT WA CO 69
CITY OF MELVIN TX 65
SOUTH COUNCIL CREEK 2 MO 64
COUNTRY ACRES MHP (LA SALLE COUNTY) CO 63
LANAGAN PWS MO 62
LEADWOOD PWS MO 61
CIRCLE H MHP NC 61
CLUBB VILLA SENIOR LIVING MO 60
LANCE CREEK WATER DISTRICT WY 58
NETT LAKE MN 57
COUNCIL CREEK VILLAGE MO 57
GIBSON GA 55
LIVE OAK HILLS SUBDIVISION MO 55
RIVERSIDE WC CO 53
CASSANDRA WATER SYSTEM NM 53
HIGHLAND COURT TX 53
DELLS CLUB CONDO ASSOC 3 WI 53
WELCH PWA OK 51
G & W WSC TX 50
FRIO CANON WATER TX 49
EAST END WA CO 48
BUDA IL 48
LAND AND WTR ASSN IL 48
VISTA VERDE WATER SYSTEMS MO 46
TEXAS LANDING UTILITIES MO 46
EMERALD ESTATES TX 46
WHITE TAIL RIDGE LAKES ESTATES TX 46

Frequently Asked Questions

Is Combined Radium (-226 and -228) in my water?

Combined Radium (-226 and -228) has been detected in violation of EPA health standards in 479 water systems across 40 states. To check your specific utility, look up your annual Consumer Confidence Report (CCR) - water systems are required to disclose all violations.

How many water systems have Combined Radium (-226 and -228) violations?

EPA SDWIS records show 479 community water systems with health-based Combined Radium (-226 and -228) violations, totaling 9,524 violations. These represent cases where the contaminant exceeded the EPA Maximum Contaminant Level (MCL).

Which states have the most Combined Radium (-226 and -228) violations?

The states with the most Combined Radium (-226 and -228) violations are: Texas (2,465 violations), Colorado (1,686 violations), Missouri (1,039 violations), Wisconsin (705 violations), Georgia (374 violations).

Explore More

Water Quality Home → All Contaminants → Browse by State →

About This Data

Violation data is from the EPA Safe Drinking Water Information System (SDWIS). Only health-based violations are shown, these include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations. Monitoring and reporting violations are excluded. Data may not reflect the most current enforcement actions.

Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services

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

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Data sourced from the U.S. Environmental Protection Agency (EPA). See our methodology for details. Retrieved and formatted by PlainEnviro