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EWG's Tap Water Database — 2019 UPDATE

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Tetrachloroethylene (perchloroethylene)

San Gabriel County WD

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.

 

85

Samples

0

Samples exceeding legal limit (MCL)

54

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.289 ppb194ND - 1.50 ppb
20130.694 ppb116ND - 1.80 ppb
20140.837 ppb128ND - 2.10 ppb
20151.08 ppb1614ND - 2.40 ppb
20161.40 ppb1110ND - 2.70 ppb
20171.26 ppb1612ND - 2.40 ppb

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
2012-01-043761-001-1125ND
2012-01-179588-010-0930ND
2012-01-179588-007-09151.40 ppb
2012-02-073761-001-1005ND
2012-03-063761-001-1030ND
2012-04-043761-001-0925ND
2012-04-189588-007-11001.20 ppb
2012-04-189588-010-1115ND
2012-05-013761-001-1135ND
2012-06-063761-001-0855ND
2012-07-033761-001-1040ND
2012-07-179588-011-1015ND
2012-07-179588-010-0930ND
2012-07-179588-007-09451.40 ppb
2012-08-073761-001-0000ND
2012-10-023761-001-1105ND
2012-10-099588-010-0920ND
2012-10-099588-007-09351.50 ppb
2012-11-073761-001-1120ND
2013-01-099588-007-09201.80 ppb
2013-01-099588-010-0930ND
2013-04-109588-007-09151.50 ppb
2013-04-109588-010-0925ND
2013-05-243761-020-1125ND
2013-07-159588-007-09101.30 ppb
2013-07-159588-010-10050.700 ppb
2013-08-139588-011-0945ND
2013-08-139588-001-1015ND
2013-10-159588-007-09251.60 ppb
2013-10-159588-010-09100.730 ppb
2014-01-099588-010-09100.570 ppb
2014-01-099588-007-09301.60 ppb
2014-04-089588-007-09401.50 ppb
2014-04-089588-010-09250.530 ppb
2014-06-173761-020-1020ND
2014-07-149588-007-09302.10 ppb
2014-07-149588-010-09151.10 ppb
2014-07-149588-011-0945ND
2014-07-159588-001-1000ND
2014-10-089588-007-09301.80 ppb
2014-10-089588-010-09200.840 ppb
2014-12-059588-020-0910ND
2015-01-149588-010-09300.610 ppb
2015-01-149588-007-09501.70 ppb
2015-03-179588-020-10500.820 ppb
2015-04-099588-020-11201.000 ppb
2015-04-099588-020-11050.900 ppb
2015-06-119588-020-09400.850 ppb
2015-06-119588-010-08500.930 ppb
2015-06-119588-007-09052.10 ppb
2015-07-169588-001-0940ND
2015-07-169588-010-10000.740 ppb
2015-07-169588-007-09201.90 ppb
2015-07-169588-011-1020ND
2015-07-169588-020-10400.790 ppb
2015-10-099588-007-09352.40 ppb
2015-10-099588-010-09001.000 ppb
2015-10-099588-020-09501.60 ppb
2016-01-139588-007-09502.70 ppb
2016-01-139588-010-09100.730 ppb
2016-04-139588-010-09050.630 ppb
2016-04-139588-007-09402.30 ppb
2016-07-189588-007-10152.30 ppb
2016-07-189588-011-0950ND
2016-07-189588-010-09350.900 ppb
2016-09-159588-020-09101.20 ppb
2016-10-199588-010-09350.860 ppb
2016-10-199588-020-09151.40 ppb
2016-10-199588-007-09252.40 ppb
2017-01-119588-020-09301.50 ppb
2017-01-11ND
2017-01-119588-010-09050.500 ppb
2017-01-119588-007-09202.40 ppb
2017-04-139588-007-09252.20 ppb
2017-04-13ND
2017-04-139588-020-09401.90 ppb
2017-04-139588-010-09150.740 ppb
2017-07-179588-011-0945ND
2017-07-179588-007-10102.40 ppb
2017-07-179588-020-10251.80 ppb
2017-07-179588-010-09251.10 ppb
2017-10-189588-010-09100.960 ppb
2017-10-189588-020-09502.20 ppb
2017-10-18ND
2017-10-189588-007-09352.40 ppb