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EWG's Tap Water Database — 2021 UPDATE

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Tetrachloroethylene (perchloroethylene)

Paw Penn District

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.

 

56

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.0636 ppb111ND - 0.700 ppb
2015ND80ND
2016ND90ND
2017ND100ND
2018ND80ND
2019ND100ND

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
2014-01-0824408301ND
2014-01-0824408001ND
2014-01-0824410701ND
2014-01-0824410601ND
2014-01-0824409501ND
2014-01-0824410501ND
2014-01-08244102010.700 ppb
2014-01-0824410401ND
2014-04-0125339001ND
2014-07-0726114501ND
2014-10-0127103201ND
2015-01-0212315837ND
2015-01-0212315879ND
2015-01-0212315858ND
2015-01-0212315816ND
2015-01-0212315795ND
2015-04-0312660723ND
2015-07-0913043461ND
2015-10-0113419764ND
2016-01-0613783274ND
2016-01-0613783253ND
2016-01-0613783232ND
2016-01-0613783190ND
2016-01-0613783211ND
2016-04-0414139324ND
2016-04-1814139346ND
2016-07-1314610381ND
2016-10-0315112451ND
2017-01-0415551714ND
2017-01-0415551735ND
2017-01-0415551693ND
2017-01-0415551756ND
2017-01-0415551661ND
2017-01-0415551777ND
2017-01-0415551640ND
2017-04-0515975959ND
2017-07-0616450374ND
2017-10-1116915028ND
2018-01-1138161501ND
2018-01-1138161401ND
2018-01-1138161301ND
2018-01-1138161201ND
2018-01-1138161101ND
2018-04-1139072601ND
2018-07-1640207301ND
2018-10-1741961701ND
2019-01-0942499301ND
2019-01-0942499401ND
2019-01-0942499501ND
2019-01-0942499201ND
2019-01-0942499601ND
2019-04-0143658101ND
2019-07-0845016101ND
2019-07-1545716201ND
2019-10-0746831501ND
2019-10-3143999801ND