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National Drinking Water Database


Strontium-90 in California


Strontium-90 is a radioactive pollutant from nuclear fallout and possibly weapons and power production.

The Most Polluted Communities in California

32 water utilities reported detecting Strontium-90 in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Strontium-90 level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1San Gabriel Valley WC - Fontana
Fontana, CA
102,5991 of 11.22 pCi/L
(1.22 pCi/L)
2City of Daly City
Daly City, CA
92,3111 of 10.83 pCi/L
(0.83 pCi/L)
3Calleguas Municipal Water Dist
Thousand Oaks, CA
021 of 230.55 pCi/L
(0 to 1.2 pCi/L)
4West Valley County Water District
Lancaster, CA
3001 of 10.47 pCi/L
(0.47 pCi/L)
5Lake Elizabeth Mutual Water Co.
Lake Elizabeth, CA
2,0312 of 20.47 pCi/L
(0.32 to 0.62 pCi/L)
6City of Benicia
Benicia, CA
28,0004 of 40.45 pCi/L
(0.45 pCi/L)
7Elsinore Valley Mwd
Lake Elsinore, CA
81,10110 of 120.39 pCi/L
(0 to 1.35 pCi/L)
8Elsinore Valley Mwd - Temescal
Lake Elsinore, CA
3,0103 of 30.38 pCi/L
(0.11 to 0.73 pCi/L)
9Usmc Yermo Annex
Barstow, CA
1,2005 of 70.37 pCi/L
(0 to 1.07 pCi/L)
10Riverview Wd
Lakeside, CA
16,0001 of 10.37 pCi/L
(0.37 pCi/L)

Health Based Limits for Strontium-90

There are no health based standards that EWG is using for this chemical

Violation Summary for Strontium-90 in California

There are no violations reported for this contaminant in California