The Power of Information

National Drinking Water Database

Combined Uranium (pCi/L) in California

Uranium is a radioactive element commonly found in most rocks; processed ore is used for power generation and weapons manufacture. [read more]

The Most Polluted Communities in California

887 water utilities reported detecting Combined Uranium (pCi/L) in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Combined Uranium (pCi/L) level

RankSystem Population Served Positive test results of total reported tests Average Level
1Rainbird Valley Mutual Water Company
Weldon, CA
2251 of 160 pCi/L
(60 pCi/L)
2Sierra Linda Mutual Water Co
North Fork, CA
2251 of 150.8 pCi/L
(50.8 pCi/L)
3Lake Morena Views MW Co.
Campo, CA
3501 of 144.25 pCi/L
(44.25 pCi/L)
4Kyburz Mutual Water System
Kyburz, CA
2501 of 143.5 pCi/L
(43.5 pCi/L)
5Lake Arrowhead Csd
Lake Arrowhead, CA
6,90027 of 2840.47 pCi/L
(0 to 59 pCi/L)
6Pike Ranch Mutual Water Co
Oakhurst, CA
603 of 338.23 pCi/L
(17.7 to 58 pCi/L)
7Guatay Mutual Benefit Corporation
Guatay, CA
1004 of 438.14 pCi/L
(32.1 to 48.45 pCi/L)
8Arrowbear Park Cwd
Arrowbear Lake, CA
80055 of 5738.07 pCi/L
(0 to 60 pCi/L)
9Hillview Wc-Oakhurst/Sierra Lakes
Oakhurst, CA
2,96123 of 2337.1 pCi/L
(3.5 to 54.45 pCi/L)
10Bass Lake Water Company
Bass Lake, CA
3,00613 of 1335.97 pCi/L
(1.03 to 59.09 pCi/L)

Health Based Limits for Combined Uranium (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 Combined Uranium (pCi/L) in California

There are no violations reported for this contaminant in California