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EWG's Tap Water Database — 2019 UPDATE

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Tetrachloroethylene (perchloroethylene)

Oyster Bay Water 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.

 

182

Samples

13

Samples exceeding legal limit (MCL)

79

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20121.24 ppb3212ND - 4.90 ppb
20131.40 ppb3216ND - 5.70 ppb
20141.39 ppb3115ND - 5.60 ppb
20151.13 ppb166ND - 5.00 ppb
20161.47 ppb3112ND - 6.52 ppb
20171.46 ppb4018ND - 5.50 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
2012-01-041201060-001A-POCND
2012-02-071202239-001A-POCND
2012-02-291202982-001-POCSND
2012-02-291202982-005-POCS1.20 ppb
2012-02-291202982-002-POCS4.80 ppb
2012-02-291202982-004-POCSND
2012-02-291202982-003-POCS4.90 ppb
2012-03-061203167-001A-POCND
2012-04-10104385-001A-POCSND
2012-05-011205064-001A-POCND
2012-05-291205B26-001-POCSND
2012-05-291205B26-002-POCS4.10 ppb
2012-05-291205B26-005-POCS1.50 ppb
2012-05-291205B26-004-POCSND
2012-05-291205B26-003-POCS4.60 ppb
2012-06-201206845-001A-POCND
2012-07-241207B14-001A-POCND
2012-08-141208853-001A-POCND
2012-09-111209462-001A-POCND
2012-09-171209795-003-POCSND
2012-09-171209795-004-POCS0.600 ppb
2012-09-171209795-005-POCSND
2012-09-171209795-002-POCS4.30 ppb
2012-09-171209795-001-POCS3.20 ppb
2012-10-091210463-001A-POCND
2012-11-141211578-001A-POCND
2012-11-271211B12-004-POCSND
2012-11-271211B12-002-POCS4.60 ppb
2012-11-271211B12-005-POCS1.20 ppb
2012-11-271211B12-001-POCSND
2012-11-271211B12-003-POCS4.70 ppb
2012-12-171212866-001A-POCND
2013-01-151301650-001A-POCND
2013-02-121302408-001A-POCND
2013-03-051303134-004-POCSND
2013-03-051303134-005-POCS1.10 ppb
2013-03-051303134-001-POCSND
2013-03-051303134-002-POCS4.00 ppb
2013-03-051303134-003-POCS4.50 ppb
2013-03-271303D04-001A-POCND
2013-04-161304942-001A-POCND
2013-05-081305379-001A-POCND
2013-06-071306365-001-POCSND
2013-06-191306A33-002-POCS4.00 ppb
2013-06-191306A33-003-POCS4.70 ppb
2013-06-191306A33-004-POCSND
2013-06-191306A33-001-POCSND
2013-06-191306A33-005-POCS1.000 ppb
2013-07-101307477-001-POCSND
2013-08-271308E22-001-POCS0.600 ppb
2013-09-111309562-004-POCSND
2013-09-111309562-003-POCS5.70 ppb
2013-09-111309562-005-POCS0.800 ppb
2013-09-111309562-001-POCSND
2013-09-111309562-002-POCS4.70 ppb
2013-09-171309958-001-POCS0.700 ppb
2013-10-141310777-001-POCSND
2013-11-131311601-001-POCS0.800 ppb
2013-12-041312158-001-POCS0.800 ppb
2013-12-181312990-004-POCSND
2013-12-181312990-002-POCS4.60 ppb
2013-12-181312990-003-POCS5.10 ppb
2013-12-181312990-001-POCSND
2013-12-301312E04-001-POCS1.60 ppb
2014-01-211401843-001-POCS0.500 ppb
2014-02-111402492-001-POCS0.600 ppb
2014-03-051403199-001-POCS0.860 ppb
2014-03-181403C52-001-POCS5.60 ppb
2014-03-181403C52-004-POCS1.60 ppb
2014-03-1803C52-005-POCSND
2014-03-181403C52-003-POCSND
2014-03-181403C52-002-POCS5.40 ppb
2014-04-081404646-001-POCS0.670 ppb
2014-04-221404F72-004-POCSND
2014-04-221404F65-0011.50 ppb
2014-04-221404F72-001-POCSND
2014-04-221404F72-002-POCS5.40 ppb
2014-04-221404F72-003-POCS5.20 ppb
2014-05-271405J26-001-POCSND
2014-06-171406B90-001-POCSND
2014-07-231407G76-001-POCSND
2014-08-181408B68-007-POCSND
2014-09-101409716-001-POCSND
2014-09-231409H36-004-POCSND
2014-09-231409H36-003-POCS5.10 ppb
2014-09-231409H36-005-POCS0.650 ppb
2014-09-231409H36-001-POCSND
2014-09-231409H36-002-POCS4.50 ppb
2014-10-301410J92-001-POCSND
2014-12-031412213-001-POCSND
2014-12-031412213-005-POCS0.860 ppb
2014-12-031412213-003-POCS4.80 ppb
2014-12-031412213-002-POCSND
2014-12-031412213-004-POCSND
2014-12-161412B34-001-POCSND
2015-01-201501A62-001-POCSND
2015-02-111502655-001-POCSND
2015-03-041503213-001-POCSND
2015-03-041503213-003-POCS4.20 ppb
2015-03-041503213-002-POCS5.00 ppb
2015-03-041503213-004-POCSND
2015-03-041503213-005-POCS1.10 ppb
2015-03-091503478-001-POCSND
2015-04-011504003-001-POCSND
2015-05-181505C34-001-POCSND
2015-05-201505E59-002-POCS3.73 ppb
2015-05-201505E59-001-POCS0.700 ppb
2015-05-201505E59-003-POCSND
2015-05-201505E59-004-POCS3.39 ppb
2015-05-201505E59-005-POCSND
2015-06-031506225-001-POCSND
2016-01-271601H95-001ND
2016-02-241502E28-001ND
2016-03-151603B65-001ND
2016-03-301603O03-003ND
2016-03-301603O03-0041.54 ppb
2016-03-301603O03-005ND
2016-03-301603O03-0025.00 ppb
2016-03-301603O03-0014.71 ppb
2016-04-191604G74-001ND
2016-06-151606E92-004ND
2016-06-151606E92-0051.33 ppb
2016-06-151606E92-001ND
2016-06-151606E92-0035.53 ppb
2016-06-151606E92-0024.43 ppb
2016-06-241605L69-001ND
2016-07-191607E62-001ND
2016-08-241608N05-001ND
2016-09-131609895-001-POCND
2016-09-261609L71-003-POC6.52 ppb
2016-09-261609L71-004-POCND
2016-09-261609L71-005-POC0.640 ppb
2016-09-291609L71-001-POCND
2016-09-291609L71-002-POC5.02 ppb
2016-10-24702735006ND
2016-11-07703821001-POCND
2016-11-217050540035.50 ppb
2016-11-217050540050.740 ppb
2016-11-21705054001ND
2016-11-21705054004ND
2016-11-217050540024.70 ppb
2016-12-19707151001ND
2017-01-18709324001-POCND
2017-02-13701114001-POCND
2017-03-207013675001-POCND
2017-03-297014366003-POC4.40 ppb
2017-03-2970143660044.90 ppb
2017-03-297014366002-POC1.10 ppb
2017-03-297014366001-POCND
2017-03-297014366005-POCND
2017-04-177015995001ND
2017-06-207021777001-POCSND
2017-06-217021951004-POC5.50 ppb
2017-06-217021951006-POC3.70 ppb
2017-06-217021951010-POC0.780 ppb
2017-06-217021951008-POCND
2017-06-217021951002-POCND
2017-06-277022475005-POCSND
2017-06-277022475002-POCSND
2017-06-277022475001-POCS0.710 ppb
2017-06-277022475004-POCS3.70 ppb
2017-06-277022475003-POCS5.10 ppb
2017-07-252902844-POCSND
2017-08-227027829001-POCND
2017-09-197030333001-POCND
2017-09-277031121004-POCND
2017-09-277031121001-POCSND
2017-09-277031121005-POC0.600 ppb
2017-09-277031121003-POC4.90 ppb
2017-09-277031121002-POC4.80 ppb
2017-10-117032516001-POCND
2017-11-287036579001-POCND
2017-12-207038629001-POCND
2017-12-277039108003-POCND
2017-12-277039108002-POC4.40 ppb
2017-12-277039108004-POC0.890 ppb
2017-12-277039161003-POC0.710 ppb
2017-12-277039161005-POC3.70 ppb
2017-12-277039161001-POCND
2017-12-277039161004-POC3.70 ppb
2017-12-277039108001-POC4.70 ppb
2017-12-277039108005-POCND