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National Drinking Water Database


Chromium (hexavalent) in California


Chromium is a metal that pollutes drinking water due to discharge from steel and pulp mills and erosion of natural deposits. [read more]

The Most Polluted Communities in California

246 water utilities reported detecting Chromium (hexavalent) in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Chromium (hexavalent) level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1City of Eureka
Eureka, CA
28,3342 of 293 ppb
(93 ppb)
2Santa Ynez Rancho Estates Mwc
Santa Ynez, CA
2941 of 125.15 ppb
(25.15 ppb)
3California Water Service Co. - Dixon
San Jose, CA
9,6001 of 125 ppb
(25 ppb)
4Hidden Valley Lake Csd
Hidden Valley Lake, CA
6,7579 of 923.5 ppb
(20 to 28 ppb)
5Paradise Lake Mwc
Salinas, CA
1801 of 120 ppb
(20 ppb)
6Volta Community Sd
Volta, CA
1501 of 120 ppb
(20 ppb)
7City of Coachella
Coachella, CA
24,2823 of 319.83 ppb
(18.67 to 21.5 ppb)
8Sbndo County Service Area 70j
Victorville, CA
4,82122 of 2219.1 ppb
(15 to 23 ppb)
9Shady Oaks Trailer Park
Orland, CA
481 of 119 ppb
(19 ppb)
10City of Watsonville
Watsonville, CA
62,0001 of 119 ppb
(19 ppb)

Health Based Limits for Chromium (hexavalent)

StandardDescriptionLevel
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.100 ppb

Violation Summary for Chromium (hexavalent) in California

There are no violations reported for this contaminant in California