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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Oyster Bay Water District

Chloroform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Chloroform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Read More.

In addition to tap water disinfection, chloroform pollution in the environment also comes from industrial discharges from pulp and paper mills, and from urban wastewater effluent. Human studies show that chloroform damages the kidneys, liver and central nervous system. In animals, chloroform causes infertility, birth defects and cancer.

Click here to read more about disinfection byproducts.

MORE ABOUT THIS CONTAMINANT

 

178

Samples

0

Samples exceeding legal limit (MCL)

24

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.104 ppb303ND - 1.20 ppb
20150.0963 ppb162ND - 0.940 ppb
20160.0700 ppb303ND - 0.770 ppb
20170.109 ppb407ND - 0.860 ppb
20180.0897 ppb365ND - 0.710 ppb
20190.107 ppb264ND - 0.860 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.4 ppb

The EWG Health Guideline of 0.4 ppb for chloroform was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

ppb = parts per billion

All test results

Date Lab ID Result
2014-01-211401843-001-POCSND
2014-02-111402492-001-POCSND
2014-03-051403199-001-POCSND
2014-03-181403C52-001-POCSND
2014-03-181403C52-004-POCSND
2014-03-1803C52-005-POCS1.10 ppb
2014-03-181403C52-003-POCSND
2014-03-181403C52-002-POCSND
2014-04-081404646-001-POCSND
2014-04-221404F72-004-POCSND
2014-04-221404F65-001ND
2014-04-221404F65-001-POCSND
2014-04-221404F72-001-POCS1.20 ppb
2014-04-221404F72-002-POCSND
2014-04-221404F72-003-POCSND
2014-05-271405J26-001-POCSND
2014-06-171406B90-001-POCSND
2014-08-181408B68-007-POCSND
2014-09-101409716-001-POCSND
2014-09-231409H36-004-POCSND
2014-09-231409H36-003-POCSND
2014-09-231409H36-005-POCSND
2014-09-231409H36-001-POCS0.830 ppb
2014-09-231409H36-002-POCSND
2014-10-301410J92-001-POCSND
2014-12-031412213-001-POCSND
2014-12-031412213-005-POCSND
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-POCS0.940 ppb
2015-03-041503213-003-POCSND
2015-03-041503213-002-POCSND
2015-03-041503213-004-POCSND
2015-03-041503213-005-POCSND
2015-03-091503478-001-POCSND
2015-04-011504003-001-POCSND
2015-05-181505C34-001-POCSND
2015-05-201505E59-002-POCSND
2015-05-201505E59-001-POCSND
2015-05-201505E59-003-POCSND
2015-05-201505E59-004-POCSND
2015-05-201505E59-005-POCS0.600 ppb
2015-06-031506225-001-POCSND
2016-01-271601H95-001ND
2016-02-241502E28-001ND
2016-03-151603B65-001ND
2016-03-301603O03-0050.660 ppb
2016-03-301603O03-001ND
2016-03-301603O03-003ND
2016-03-301603O03-004ND
2016-03-301603O03-002ND
2016-04-191604G74-001ND
2016-06-151606E92-004ND
2016-06-151606E92-001ND
2016-06-151606E92-005ND
2016-06-151606E92-003ND
2016-06-151606E92-002ND
2016-06-241605L69-001ND
2016-07-191607E62-001ND
2016-08-241608N05-001ND
2016-09-131609895-001-POCND
2016-09-261609L71-003-POCND
2016-09-261609L71-005-POCND
2016-09-291609L71-002-POCND
2016-09-291609L71-001-POC0.670 ppb
2016-10-24702735006ND
2016-11-07703821001-POCND
2016-11-21705054002ND
2016-11-217050540010.770 ppb
2016-11-21705054003ND
2016-11-21705054004ND
2016-11-21705054005ND
2016-12-19707151001ND
2017-01-18709324001-POCND
2017-02-13701114001-POCND
2017-03-207013675001-POCND
2017-03-297014366004ND
2017-03-297014366005-POC0.500 ppb
2017-03-297014366001-POCND
2017-03-297014366003-POCND
2017-03-297014366002-POCND
2017-04-177015995001ND
2017-06-207021777001-POCSND
2017-06-217021951006-POCND
2017-06-217021951008-POCND
2017-06-217021951010-POC0.520 ppb
2017-06-217021951004-POCND
2017-06-217021951002-POC0.520 ppb
2017-06-277022475004-POCSND
2017-06-277022475005-POCSND
2017-06-277022475002-POCS0.860 ppb
2017-06-277022475001-POCSND
2017-06-277022475003-POCSND
2017-07-252902844-POCSND
2017-08-227027829001-POCND
2017-09-197030333001-POCND
2017-09-277031121002-POCND
2017-09-277031121004-POCND
2017-09-277031121001-POCS0.620 ppb
2017-09-277031121005-POCND
2017-09-277031121003-POCND
2017-10-117032516001-POCND
2017-11-287036579001-POCND
2017-12-207038629001-POCND
2017-12-277039161004-POCND
2017-12-277039108001-POCND
2017-12-277039108005-POC0.720 ppb
2017-12-277039161001-POC0.630 ppb
2017-12-277039108002-POCND
2017-12-277039161003-POCND
2017-12-277039108003-POCND
2017-12-277039161005-POCND
2017-12-277039108004-POCND
2018-01-237041065001-POCND
2018-02-207043329001ND
2018-03-057044397005ND
2018-03-057044397004ND
2018-03-057044397002-POCND
2018-03-057044397003-POCND
2018-03-057044397005-POCND
2018-03-057044397003ND
2018-03-057044397004-POCND
2018-03-0570443970010.620 ppb
2018-03-057044397001-POC0.620 ppb
2018-03-057044397002ND
2018-03-127045041001ND
2018-04-167048487001ND
2018-05-227019203001-POCND
2018-06-187055214001ND
2018-06-197055367001-POC0.710 ppb
2018-06-197055367004-POCND
2018-06-197055367003-POCND
2018-06-197055367002-POCND
2018-06-197055367005-POCND
2018-07-107057586001-POCND
2018-09-047063482001ND
2018-09-1070641690010.640 ppb
2018-09-107064169005ND
2018-09-107064169003ND
2018-09-107064169004ND
2018-09-107064169002ND
2018-10-027066425001ND
2018-11-057069977001ND
2018-12-117073536001ND
2018-12-187074229003ND
2018-12-187074229005ND
2018-12-187074229004ND
2018-12-187074229002ND
2018-12-1870742290010.640 ppb
2019-01-157076659001ND
2019-02-257080524001ND
2019-03-057081264001ND
2019-03-067081538004ND
2019-03-067081538002ND
2019-03-067081538005ND
2019-03-0670815380010.590 ppb
2019-03-067081538003ND
2019-04-087084888001ND
2019-05-217090317001ND
2019-06-177093915004ND
2019-06-177093915002ND
2019-06-1770939150010.790 ppb
2019-06-177093915003ND
2019-06-1770939150050.530 ppb
2019-06-187094101001ND
2019-07-167097674001ND
2019-08-2070101965001ND
2019-09-1770105249001ND
2019-09-1870105360003ND
2019-09-1870105360005ND
2019-09-1870105360002ND
2019-09-1870105360004ND
2019-09-18701053600010.860 ppb
2019-10-1570108433001ND
2019-11-1470111424001ND