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EWG's Tap Water Database — 2019 UPDATE

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Tetrachloroethylene (perchloroethylene)

Harris County MUD 165

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.

 

17

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013ND20ND
2014ND20ND
2015ND70ND
2016ND30ND
2017ND30ND

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
2013-06-13AC22099ND
2013-06-13AC22097ND
2014-07-16AC59847ND
2014-07-16AC59843ND
2015-05-27AC93425ND
2015-05-27AC93397ND
2015-05-27AC93395ND
2015-09-09AD06257ND
2015-09-09AD06255ND
2015-11-10AD13188ND
2015-11-10AD13186ND
2016-03-21AD29673ND
2016-03-21AD29633ND
2016-03-21AD29639ND
2017-05-04AD82785ND
2017-05-04AD82787ND
2017-05-04AD82793ND