The Power of Information

National Drinking Water Database


Radium-226 in California


Radium-226 is a radioactive element usually found around uranium deposits. [read more]

The Most Polluted Communities in California

441 water utilities reported detecting Radium-226 in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Radium-226 level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Pike Ranch Mutual Water Co
Oakhurst, CA
601 of 34.5 pCi/L
(0 to 13.5 pCi/L)
2@fcsa #40/Del Rio
Firebaugh, CA
1431 of 14.44 pCi/L
(4.44 pCi/L)
3Volcano Community Service Dist
Volcano, CA
1601 of 13.2 pCi/L
(3.2 pCi/L)
4Mineral Mountain Mutual Water
Murphys, CA
482 of 22.91 pCi/L
(2.45 to 3.37 pCi/L)
5Bar 20 Partner
Kerman, CA
603 of 32.7 pCi/L
(1.98 to 3.61 pCi/L)
6Cws - Lakeland
Lake Isabella, CA
51518 of 352.5 pCi/L
(0 to 8.41 pCi/L)
7Melody Oaks Trailer Park
Jackson, CA
1201 of 12.29 pCi/L
(2.29 pCi/L)
8Md#06 Lake Shore Park
Bass Lake, CA
1305 of 52.23 pCi/L
(1.79 to 2.64 pCi/L)
9Fiddletown Community Service
Fiddletown, CA
2603 of 32.22 pCi/L
(0.11 to 4.1 pCi/L)
10South Montebello Irrigation Dist.
Montebello, CA
7,8801 of 11.43 pCi/L
(1.43 pCi/L)

Health Based Limits for Radium-226

StandardDescriptionLevel
Maximum Contaminant Limit Goal (MCLG)A non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.0 pCi/L
California Public Health GoalsDefined by the State of California Office of Environmental Health Hazard Assessment (OEHHA) as the level of contaminant that is allowed in drinking water. For acutely toxic substances, levels are set at which scientific evidence indicates that no known or anticipated adverse effects on health will occur, plus an adequate margin-of safety. PHGs for carcinogens or other substances which can cause chronic disease shall be based solely on health effects without regard to cost impacts and shall be set at levels which OEHHA has determined do not pose any significant risk to health.0.05 pCi/L
Maximum Contaminant Limit (MCL)The enforceable standard which defines the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to health-based limits (Maximum Contaminant Level Goals, or MCLGs) as feasible using the best available analytical and treatment technologies and taking cost into consideration. Source: U.S. Environmental Protection Agency.5 pCi/L
Maximum Contaminant Limit (MCL)The enforceable standard which defines the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to health-based limits (Maximum Contaminant Level Goals, or MCLGs) as feasible using the best available analytical and treatment technologies and taking cost into consideration. Source: U.S. Environmental Protection Agency.5 pCi/L

Violation Summary for Radium-226 in California

Data from the U.S. Environmental Protection Agency includes the following violations of federal standards in California since 2004

Violation TypeNumber of Violations
Failure to monitor regularly12