The Power of Information

National Drinking Water Database

Alpha particle activity in California

Alpha particles are a form of radiation released from mining waste pollutants and natural sources. [read more]

The Most Polluted Communities in California

1,900 water utilities reported detecting Alpha particle activity in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Alpha particle activity level

RankSystem Population Served Positive test results of total reported tests Average Level
1Kyburz Mutual Water System
Kyburz, CA
2501 of 145 pCi/L
(45 pCi/L)
2Rainbird Valley Mutual Water Company
Weldon, CA
2251 of 144.7 pCi/L
(44.7 pCi/L)
3Home Gardens County Wd
Corona, CA
3,0443 of 338.33 pCi/L
(33 to 44 pCi/L)
4@fcsa #40/Del Rio
Firebaugh, CA
1431 of 137.1 pCi/L
(37.1 pCi/L)
5Md#06 Lake Shore Park
Bass Lake, CA
1302 of 234.95 pCi/L
(25.3 to 44.6 pCi/L)
6R.S. Mutual Water Company
Wofford Heights, CA
153 of 334.53 pCi/L
(28.4 to 41.1 pCi/L)
7Lake Arrowhead Csd
Lake Arrowhead, CA
6,90018 of 1834.23 pCi/L
(8.07 to 44.8 pCi/L)
8Camp Antelope
Coleville, CA
401 of 133.6 pCi/L
(33.6 pCi/L)
9Md#07 Marina View Heights
Bass Lake, CA
2003 of 333.52 pCi/L
(26.05 to 42 pCi/L)
10Arrowbear Park Cwd
Arrowbear Lake, CA
800175 of 17933.49 pCi/L
(0 to 45 pCi/L)

Health Based Limits for Alpha particle activity

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
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.15 pCi/L

Violation Summary for Alpha particle activity in California

There are no violations reported for this contaminant in California