Polychlorinated biphenyls (PCBs)
CTWC - Shoreline Region-Guilford System
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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | ND | 5 | 0 | ND |
2015 | ND | 3 | 0 | ND |
2016 | ND | 11 | 0 | ND |
2017 | N/A | 0 | 0 | N/A |
2018 | ND | 1 | 0 | ND |
2019 | ND | 16 | 0 | ND |
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 |
---|---|---|
2014-06-12 | 140612CWCSOC2 | ND |
2014-09-16 | 141015-0009SOC2 | ND |
2014-09-16 | 3104521 | ND |
2014-11-03 | 3132509 | ND |
2014-12-11 | 3153933 | ND |
2015-06-03 | BJ25400SOC2 | ND |
2015-07-27 | BJ63961SOC2 | ND |
2015-10-19 | BK10283SOC2 | ND |
2016-01-21 | BK55954SOC2 | ND |
2016-01-21 | BK55943SOC2 | ND |
2016-01-21 | BK55941SOC2 | ND |
2016-01-25 | BK57134SOC2 | ND |
2016-03-14 | BK78127SOC2 | ND |
2016-05-04 | BN25256SOC2 | ND |
2016-06-01 | BN44892SOC2 | ND |
2016-06-01 | BN44876SOC2 | ND |
2016-07-12 | BN71477SOC2 | ND |
2016-07-19 | BN75782SOC2 | ND |
2016-07-19 | BN75784SOC2 | ND |
2018-07-09 | CA86688 | ND |
2019-01-30 | SOC 200520057 | ND |
2019-01-30 | 200520057-SOC | ND |
2019-06-06 | SOC 200535308 | ND |
2019-06-06 | SOC 200535309 | ND |
2019-06-11 | SOC 200536055 | ND |
2019-06-11 | SOC 200536054 | ND |
2019-06-19 | SOC 200542695 | ND |
2019-06-24 | SOC 200537520 | ND |
2019-07-29 | SOC 200542348 | ND |
2019-07-30 | SOC 200542453 | ND |
2019-07-31 | SOC 200542480 | ND |
2019-07-31 | SOC 200542466 | ND |
2019-07-31 | SOC 200542497 | ND |
2019-07-31 | SOC 200542499 | ND |
2019-07-31 | SOC 200542468 | ND |
2019-08-14 | SOC 200544869 | ND |