The Power of Information

National Drinking Water Database


Radium-228 in California


Radium-228 is a radioactive element usually found around uranium deposits. [read more]

The Most Polluted Communities in California

1,367 water utilities reported detecting Radium-228 in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Radium-228 level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Melody Oaks Trailer Park
Jackson, CA
1201 of 18.67 pCi/L
(8.67 pCi/L)
2Copco Lake Mwc
Montague, CA
2004 of 43.8 pCi/L
(3.8 pCi/L)
3Birchim Community Services Dist
Mammoth Lakes, CA
1301 of 12.81 pCi/L
(2.81 pCi/L)
4Tud - Phoenix Lake Park
Sonora, CA
1523 of 41.93 pCi/L
(0 to 3.1 pCi/L)
5@fcsa #40/Del Rio
Firebaugh, CA
1431 of 11.85 pCi/L
(1.85 pCi/L)
6Crystal Caves Mhp
Somerset, CA
1004 of 41.8 pCi/L
(1.8 pCi/L)
7Hidden Acres Trailer Villa
Vacaville, CA
801 of 11.61 pCi/L
(1.61 pCi/L)
8City of Vallejo
Vallejo, CA
130,3084 of 41.58 pCi/L
(1.58 pCi/L)
9Shasta Forest Village M.W.C.
Shingletown, CA
1,0184 of 51.56 pCi/L
(0 to 1.95 pCi/L)
10San Martin Foothills Water Company
San Martin, CA
1292 of 41.54 pCi/L
(0 to 5.67 pCi/L)

Health Based Limits for Radium-228

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.0.02 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-228 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 regularly2