Know Your Environment. Protect Your Health.

Benzene

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Benzene is a known human carcinogen. It also damages blood cells and the nervous system. Emissions from petroleum processing, hazardous waste landfills and underground storage tanks contaminate drinking water with benzene. Read More.

To protect against cancer risks, California set a public health goal for benzene in drinking water at 0.15 parts per billion, 30 times lower than the federal legal limit of 5 parts per billion.

Click here to read more about carcinogenic VOCs.

 

23

Samples

0

Samples exceeding legal limit (MCL)

3

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
2019ND40ND
20200.263 ppb31ND - 0.790 ppb
2021ND40ND
20220.320 ppb42ND - 0.900 ppb
2023ND40ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.15 ppb

The EWG Health Guideline of 0.15 ppb for benzene was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

EPA Maximum Contaminant
Level (MCL): 5 ppb

The legal limit for benzene, established in 1987, was based on analytical detection limits at the time that the standard was set. This limit may not fully protect against the risk of cancer due to benzene exposure.

ppb = parts per billion

All test results

Date Lab ID Result
2018-03-14371423001ND
2018-05-29385147001ND
2018-08-22403173001ND
2018-10-23199879ND
2019-03-20436653001ND
2019-06-24453752001ND
2019-08-19464655001ND
2019-12-18487030001ND
2020-05-121188026ND
2020-09-241219644ND
2020-10-2112259560.790 ppb
2021-01-281238946ND
2021-04-191250918ND
2021-09-011276129ND
2021-11-081289483ND
2022-03-145040671A0.380 ppb
2022-04-055040801A0.900 ppb
2022-07-2652025291ND
2022-10-1152036553ND
2023-03-2353012772ND
2023-05-1053019602ND
2023-07-1953028169ND
2023-10-0453038727ND