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EWG's Tap Water Database — 2021 UPDATE

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Tetrachloroethylene (perchloroethylene)

Great Oaks Water Company Inc.

Dry cleaning chemical tetrachloroethylene, or perc, can cause cancer. It pollutes soil and groundwater due to emissions from dry cleaning facilities, and automotive, metalworking and other industries. Read More.

The EPA considers tetrachloroethylene a likely human carcinogen. It has been linked with increased incidence of lung, breast and colon cancers. Tetrachloroethylene also damages the liver, kidneys and central nervous system. The California public health goal of 0.06 parts per billion, set to protect against cancer, is 80 times lower than the amount allowed by the federal government, which is a Maximum Contaminant Level of 5 parts per billion.

Click here to read more about carcinogenic VOCs.

MORE ABOUT THIS CONTAMINANT

 

48

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND70ND
2015ND20ND
2016ND150ND
2017ND70ND
2018ND20ND
2019ND150ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.06 ppb

The EWG Health Guideline of 0.06 ppb for tetrachloroethylene 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 tetrachloroethylene, established in 1991, was based on analytical detection limits at the time that the standard was set. This limit does not fully protect against the risk of cancer due to tetrachloroethylene exposure.

ppb = parts per billion

All test results

Date Lab ID Result
2014-03-279590-013-1030ND
2014-05-159590-013-1115ND
2014-08-259590-007-0855ND
2014-08-259590-022-1505ND
2014-08-259590-021-1545ND
2014-08-259590-010-1035ND
2014-08-279590-013-1230ND
2015-09-229590-007-0850ND
2015-09-229590-013-1000ND
2016-05-259590-025-1415ND
2016-08-229590-004-1230ND
2016-08-229590-011-1325ND
2016-08-229590-009-1410ND
2016-08-249590-018-1315ND
2016-08-249590-013-1230ND
2016-08-249590-015-1450ND
2016-08-249590-023-1405ND
2016-08-259590-001-1205ND
2016-08-259590-019-1350ND
2016-08-259590-008-1255ND
2016-08-259590-002-1435ND
2016-09-069590-007-1400ND
2016-09-289590-025-1400ND
2016-11-029590-025-1115ND
2017-03-089590-025-0930ND
2017-04-139590-006-1000ND
2017-06-019590-010-1030ND
2017-08-309590-007-1030ND
2017-08-309590-021-1510ND
2017-08-319590-025-1440ND
2017-08-319590-022-1515ND
2018-08-299590-010-0930ND
2018-08-309590-007-0930ND
2019-08-289590-001-1420ND
2019-08-289590-007-1120ND
2019-08-289590-006-0920ND
2019-08-289590-002-1030ND
2019-08-299590-018-1000ND
2019-08-299590-015-0850ND
2019-08-299590-009-0745ND
2019-08-299590-008-1410ND
2019-08-299590-004-1310ND
2019-09-059590-023-1400ND
2019-09-059590-019-1145ND
2019-09-059590-025-1250ND
2019-09-129590-013-1430ND
2019-09-129590-011-1300ND
2019-09-129590-010-1145ND