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EWG's Tap Water Database — 2019 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.

 

180

Samples

0

Samples exceeding legal limit (MCL)

23

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.119 ppb324ND - 1.10 ppb
20130.122 ppb324ND - 1.000 ppb
20140.104 ppb303ND - 1.20 ppb
20150.0963 ppb162ND - 0.940 ppb
20160.0700 ppb303ND - 0.770 ppb
20170.109 ppb407ND - 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
2012-01-041201060-001A-POCND
2012-02-071202239-001A-POCND
2012-02-291202982-001-POCS1.000 ppb
2012-02-291202982-005-POCSND
2012-02-291202982-002-POCSND
2012-02-291202982-004-POCSND
2012-02-291202982-003-POCSND
2012-03-061203167-001A-POCND
2012-04-10104385-001A-POCSND
2012-05-011205064-001A-POCND
2012-05-291205B26-001-POCS1.10 ppb
2012-05-291205B26-002-POCSND
2012-05-291205B26-005-POCSND
2012-05-291205B26-004-POCSND
2012-05-291205B26-003-POCSND
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-POCSND
2012-09-171209795-005-POCS0.700 ppb
2012-09-171209795-002-POCSND
2012-09-171209795-001-POCSND
2012-10-091210463-001A-POCND
2012-11-141211578-001A-POCND
2012-11-271211B12-004-POCSND
2012-11-271211B12-002-POCSND
2012-11-271211B12-005-POCSND
2012-11-271211B12-001-POCS1.000 ppb
2012-11-271211B12-003-POCSND
2012-12-171212866-001A-POCND
2013-01-151301650-001A-POCND
2013-02-121302408-001A-POCND
2013-03-051303134-004-POCSND
2013-03-051303134-005-POCSND
2013-03-051303134-001-POCS1.000 ppb
2013-03-051303134-002-POCSND
2013-03-051303134-003-POCSND
2013-03-271303D04-001A-POCND
2013-04-161304942-001A-POCND
2013-05-081305379-001A-POCND
2013-06-071306365-001-POCSND
2013-06-191306A33-002-POCSND
2013-06-191306A33-003-POCSND
2013-06-191306A33-004-POCSND
2013-06-191306A33-001-POCS1.000 ppb
2013-06-191306A33-005-POCSND
2013-07-101307477-001-POCSND
2013-08-271308E22-001-POCSND
2013-09-111309562-004-POCSND
2013-09-111309562-003-POCSND
2013-09-111309562-005-POCSND
2013-09-111309562-001-POCS0.900 ppb
2013-09-111309562-002-POCSND
2013-09-171309958-001-POCSND
2013-10-141310777-001-POCSND
2013-11-131311601-001-POCSND
2013-12-041312158-001-POCSND
2013-12-181312990-004-POCSND
2013-12-181312990-002-POCSND
2013-12-181312990-003-POCSND
2013-12-181312990-001-POCS1.000 ppb
2013-12-301312E04-001-POCSND
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