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EWG's Tap Water Database — 2021 UPDATE

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Polychlorinated biphenyls (PCBs)

City of Buckeye Sonora - Sundance

PCBs are synthetic chemicals banned in the U.S. since the 1970s because of their toxicity. PCBs contaminate water by leaching from landfills and hazardous waste clean-up sites. PCBs increase the risk of cancer. Read More.

Up until the late 1970s, PCBs were used widely as coolants and lubricants in transformers, capacitors and other electrical equipment. Currently, PCBs are widely detected in the general population. They build up and are stored in fatty tissues and fluids such as breast milk, and can be passed on to fetuses and infants during pregnancy and breast-feeding. In human epidemiological studies, PCBs have been associated with an elevated risk of breast and prostate cancers. Infants and children with higher PCB exposures during development score lower on measures of neurological function, ranging from decreased IQ scores to reduced hearing sensitivity. PCBs also affect hormones and damage the immune system.

 

28

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND120ND
2015ND30ND
2016ND40ND
2017ND50ND
2018ND20ND
2019ND20ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.09 ppb

The EWG Health Guideline of 0.09 ppb for PCBs 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) 0.5 ppb

The legal limit for PCBs, established in 1991, 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 PCB exposure.

ppb = parts per billion

All test results

Date Lab ID Result
2014-05-07484777-001AND
2014-05-07484934-001AND
2014-05-07484777-001BND
2014-05-07484934-001BND
2014-09-04492627-001CND
2014-09-04492628-001CND
2014-09-04492627-001DND
2014-09-04492628-001DND
2014-10-23495554-001BND
2014-10-23495554-001CND
2014-10-29496126-001CND
2014-10-29496126-001BND
2015-02-19502653-001ND
2015-02-26503037-001BND
2015-02-26503037-001AND
2016-02-23525398-001CND
2016-02-23525398-001BND
2016-02-24525405-001BND
2016-02-24525405-001CND
2017-04-13550767-001BND
2017-04-27551845-001BND
2017-09-27563905-001ND
2017-09-27563906-001ND
2017-09-27563906-001BND
2018-02-013865371ND
2018-02-07575672-001ND
2019-01-1019A1098-01ND
2019-01-1019A1098-02ND