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National Drinking Water Database


Chromium (total) 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

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

Ranked by highest average Chromium (total) level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Tucker Acres Mutual Water Co.
Calistoga, CA
2001 of 160 ppb
(60 ppb)
2Arnold Park (O Bannon S Mhp)
Hollister, CA
2814 of 1449.71 ppb
(34 to 75 ppb)
3Fawcett Farms
Los Banos, CA
505 of 549 ppb
(40.7 to 60.3 ppb)
4Villa Las Flores
Patterson, CA
241 of 136 ppb
(36 ppb)
5Fountain Trailer Park Water
North Edwards, CA
402 of 233.5 ppb
(11 to 56 ppb)
6Little Baldy
Llano, CA
761 of 133.5 ppb
(33.5 ppb)
7Woodstock Property Owners Assn
Santa Ynez, CA
3503 of 330.67 ppb
(16 to 40 ppb)
8California Water Service Co. - Dixon
San Jose, CA
9,60013 of 1328.35 ppb
(19 to 44.52 ppb)
9Santa Ynez Rancho Estates Mwc
Santa Ynez, CA
2943 of 327.5 ppb
(19 to 40 ppb)
1049er Trailer Ranch
Columbia, CA
1482 of 326.67 ppb
(0 to 41 ppb)

Health Based Limits for Chromium (total)

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
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.100 ppb
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.100 ppb
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.1000 ppb
Children's health-based limit for 10-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.1000 ppb

Violation Summary for Chromium (total) 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 regularly8
Over maximum contaminant level, Average1