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EWG's Tap Water Database — 2019 UPDATE

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Tetrachloroethylene (perchloroethylene)

City of Gilroy

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.

 

217

Samples

0

Samples exceeding legal limit (MCL)

62

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.394 ppb4116ND - 2.00 ppb
20130.410 ppb3412ND - 2.30 ppb
20140.502 ppb3311ND - 3.50 ppb
20150.194 ppb488ND - 2.70 ppb
20160.306 ppb316ND - 2.30 ppb
20170.345 ppb309ND - 2.20 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
2012-01-185810-001-0940ND
2012-01-185810-002-08400.990 ppb
2012-01-185806-007-1015ND
2012-02-225810-001-08100.710 ppb
2012-02-225810-002-07450.700 ppb
2012-03-135810-001-08240.790 ppb
2012-03-135810-002-08150.840 ppb
2012-04-115810-001-08450.730 ppb
2012-04-115810-002-08320.790 ppb
2012-04-115810-004-0817ND
2012-04-115810-006-1125ND
2012-04-115810-007-0940ND
2012-04-115810-008-1005ND
2012-04-115810-009-1010ND
2012-04-115810-010-0857ND
2012-04-115810-011-0800ND
2012-05-215810-001-0850ND
2012-05-215810-002-11350.850 ppb
2012-05-215810-004-1045ND
2012-05-215810-006-1315ND
2012-05-225810-007-0745ND
2012-05-225810-008-0955ND
2012-05-225810-009-1035ND
2012-05-225810-010-1115ND
2012-05-225810-011-08350.520 ppb
2012-06-135810-001-0757ND
2012-06-135810-002-08101.10 ppb
2012-07-235810-001-0747ND
2012-07-235810-002-08061.40 ppb
2012-07-235810-007-1013ND
2012-08-235810-001-1115ND
2012-08-235810-002-11001.90 ppb
2012-09-195810-001-1015ND
2012-09-195810-002-10002.00 ppb
2012-10-105810-001-1025ND
2012-10-105810-002-10451.30 ppb
2012-10-105810-007-0918ND
2012-11-205810-001-0815ND
2012-11-205810-002-08350.920 ppb
2012-12-125810-001-0750ND
2012-12-125810-002-08020.620 ppb
2013-01-165810-001-09550.570 ppb
2013-01-165810-002-0940ND
2013-01-165810-007-1028ND
2013-02-145810-001-08350.730 ppb
2013-02-145810-002-08010.670 ppb
2013-03-135810-001-0810ND
2013-03-135810-002-07550.640 ppb
2013-04-175810-001-1045ND
2013-04-175810-002-11001.20 ppb
2013-04-175810-004-1130ND
2013-04-175810-006-0935ND
2013-04-175810-007-1000ND
2013-04-175810-008-0740ND
2013-04-175810-009-0740ND
2013-04-175810-010-1030ND
2013-04-175810-011-0830ND
2013-05-155810-001-0800ND
2013-05-155810-002-08301.80 ppb
2013-06-135810-001-0748ND
2013-06-135810-002-08151.30 ppb
2013-07-225810-001-0820ND
2013-07-225810-002-08301.70 ppb
2013-07-225810-007-0930ND
2013-08-215810-001-0815ND
2013-08-215810-002-08072.30 ppb
2013-09-165810-001-0750ND
2013-09-165810-002-08051.30 ppb
2013-10-095810-001-0943ND
2013-10-095810-002-09281.000 ppb
2013-10-095810-007-1010ND
2013-11-145810-001-0815ND
2013-11-145810-002-08200.740 ppb
2013-12-125810-001-0758ND
2013-12-125810-002-0749ND
2014-01-155810-001-0925ND
2014-01-155810-002-09470.530 ppb
2014-01-155810-007-0835ND
2014-02-125810-001-0822ND
2014-02-125810-002-08530.830 ppb
2014-03-205810-001-0813ND
2014-03-205810-002-08000.700 ppb
2014-04-235810-001-0900ND
2014-04-235810-002-07490.650 ppb
2014-04-235810-004-0945ND
2014-04-235810-006-1058ND
2014-04-235810-007-1039ND
2014-04-235810-008-0819ND
2014-04-235810-010-0913ND
2014-04-235810-011-0847ND
2014-05-215810-001-0750ND
2014-05-215810-002-08002.90 ppb
2014-06-125810-001-0747ND
2014-06-125810-002-07561.20 ppb
2014-07-175810-001-0946ND
2014-07-175810-002-08021.70 ppb
2014-07-175810-007-1011ND
2014-08-285810-001-1121ND
2014-08-285810-002-11300.950 ppb
2014-09-175810-001-0801ND
2014-09-175810-002-08223.00 ppb
2014-10-155810-001-0759ND
2014-10-155810-002-10503.50 ppb
2014-10-155810-007-0836ND
2014-11-195810-002-07480.600 ppb
2014-11-245810-001-1040ND
2014-12-225810-001-0930ND
2014-12-225810-002-1000ND
2015-01-215810-001-0822ND
2015-01-215810-002-0845ND
2015-01-215810-007-0925ND
2015-02-115810-001-0815ND
2015-02-115810-002-07550.530 ppb
2015-03-105810-001-0740ND
2015-03-105810-002-07510.680 ppb
2015-04-225810-001-0915ND
2015-04-225810-002-09442.10 ppb
2015-04-225810-004-1305ND
2015-04-225810-006-0845ND
2015-04-225810-007-1142ND
2015-04-225810-008-1215ND
2015-04-225810-009-1239ND
2015-04-225810-010-1110ND
2015-04-225810-011-1040ND
2015-05-205810-006-0945ND
2015-05-205810-007-1300ND
2015-05-205810-008-1025ND
2015-05-205810-009-1100ND
2015-05-205810-010-0810ND
2015-05-215810-001-0800ND
2015-05-215810-002-10102.70 ppb
2015-05-215810-004-1250ND
2015-05-215810-011-0955ND
2015-06-225810-001-0800ND
2015-06-225810-002-08201.10 ppb
2015-07-205810-001-0812ND
2015-07-205810-002-08300.790 ppb
2015-07-205810-007-1022ND
2015-08-195810-001-0802ND
2015-08-195810-001-1225ND
2015-08-195810-002-08170.700 ppb
2015-08-195810-002-12500.710 ppb
2015-08-195810-004-1320ND
2015-08-195810-006-0948ND
2015-08-195810-007-1120ND
2015-08-195810-008-1019ND
2015-08-195810-009-1044ND
2015-08-195810-010-1203ND
2015-08-205810-011-0845ND
2015-09-295810-001-0852ND
2015-09-295810-002-0840ND
2015-10-145810-001-1040ND
2015-11-185810-001-0840ND
2015-11-185810-002-0925ND
2015-12-145810-001-0840ND
2015-12-145810-002-0821ND
2016-01-205810-001-0940ND
2016-01-205810-002-0832ND
2016-02-105810-001-0830ND
2016-02-105810-002-0820ND
2016-03-165810-001-1030ND
2016-03-165810-002-1050ND
2016-04-255810-001-0832ND
2016-04-255810-002-1055ND
2016-04-255810-004-0855ND
2016-04-255810-006-0905ND
2016-04-255810-008-0950ND
2016-04-255810-009-0940ND
2016-04-255810-010-1041ND
2016-04-255810-011-1005ND
2016-05-185810-001-0905ND
2016-05-185810-002-08580.900 ppb
2016-06-165810-001-0820ND
2016-06-165810-002-08401.70 ppb
2016-07-205810-001-0915ND
2016-07-205810-002-09451.60 ppb
2016-07-205810-006-1019ND
2016-08-045810-001-1125ND
2016-08-045810-002-11401.50 ppb
2016-09-225810-001-0756ND
2016-09-225810-002-08162.30 ppb
2016-10-135810-001-0750ND
2016-10-135810-002-08201.50 ppb
2016-11-095810-001-0830ND
2016-11-095810-002-0850ND
2016-12-155810-001-0835ND
2016-12-155810-002-0850ND
2017-01-185810-001-0855ND
2017-01-185810-002-0835ND
2017-02-155810-001-0755ND
2017-02-155810-002-08150.850 ppb
2017-03-155810-001-0810ND
2017-03-155810-002-08300.900 ppb
2017-04-135810-001-0935ND
2017-04-135810-002-08300.850 ppb
2017-04-135810-006-0915ND
2017-04-135810-008-1025ND
2017-04-135810-009-1035ND
2017-04-135810-010-1015ND
2017-04-135810-011-0800ND
2017-05-155810-001-1140ND
2017-05-155810-002-11201.20 ppb
2017-06-135810-001-07400.700 ppb
2017-06-135810-002-08000.850 ppb
2017-06-135810-004-0817ND
2017-06-135810-007-0945ND
2017-07-175810-001-1130ND
2017-07-175810-002-12501.40 ppb
2017-07-175810-007-1050ND
2017-08-245810-001-0740ND
2017-08-245810-002-07581.40 ppb
2017-09-185810-001-0822ND
2017-09-185810-002-08102.20 ppb
2017-10-055810-001-0805ND
2017-10-055810-007-0845ND
2017-11-205810-001-1300ND
2017-12-145810-001-0845ND