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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

New York American Water - Sea Cliff

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

 

137

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND170ND
2015ND190ND
2016ND200ND
2017ND150ND
2018ND320ND
20190.0221 ppb341ND - 0.750 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
2014-02-041402068-001-POCSND
2014-03-06103383-003-POCSND
2014-03-061403383-001-POCSND
2014-03-061403383-003-POCSND
2014-04-0204187-001-POCSND
2014-04-021404187-001-POCSND
2014-04-021404187-003-POCSND
2014-05-071405474-001-POCSND
2014-06-101406727-001-POCSND
2014-07-081407443-001-POCSND
2014-07-081407443-003-POCSND
2014-08-05140828-001-POCSND
2014-09-081409505-001-POCSND
2014-10-071410466-001-POCSND
2014-10-071410466-003-POCSND
2014-11-121411766-001-POCSND
2014-12-021412131-001-POCSND
2015-01-051501102-003-POCSND
2015-01-051501102-001-POCSND
2015-02-041502203-001-POCSND
2015-03-031503130-001-POCSND
2015-04-081504541-001-POCSND
2015-05-071505554-001-POCSND
2015-05-071505537-001-POCSND
2015-05-201505E69-001-POCSND
2015-06-151506B92-001-POCSND
2015-07-081507488-001ND
2015-07-081507488-003ND
2015-08-051508310-001 POCSND
2015-09-151509A69-001ND
2015-09-151509A69-003ND
2015-10-061510358-001ND
2015-10-061510358-003ND
2015-11-091511661-003ND
2015-11-091511661-001ND
2015-12-021512184-001ND
2016-01-111601562-001ND
2016-01-261601G80-001ND
2016-03-011603105-001ND
2016-03-011603105-003ND
2016-04-061604546-003ND
2016-04-061604546-001ND
2016-05-031605198-001ND
2016-05-031605198-003ND
2016-06-081606789-003ND
2016-06-081606789-001ND
2016-07-061607433-001ND
2016-07-061607433-003ND
2016-08-021608166-002ND
2016-08-021608166-005ND
2016-09-071609450-001ND
2016-09-071609450-003ND
2016-10-04701176002ND
2016-10-06701359002ND
2016-11-02703523001ND
2016-12-06706116001ND
2017-01-04708295001ND
2017-02-077010806001ND
2017-03-077012749001ND
2017-04-047014847001ND
2017-04-247016671002ND
2017-05-027017429001ND
2017-06-067020461001ND
2017-06-137021163001ND
2017-07-057023139003ND
2017-07-057023139001ND
2017-08-017025787002ND
2017-09-057028919001ND
2017-10-027031587001ND
2017-11-077035028001ND
2017-12-057037238001ND
2018-01-097039910001ND
2018-02-087042474001ND
2018-02-137042771004ND
2018-02-137042771001ND
2018-02-137042771002ND
2018-02-137042771003ND
2018-03-067044573001ND
2018-04-037047080001ND
2018-05-017050134001ND
2018-05-157051716002ND
2018-05-157051716003ND
2018-05-157051716004ND
2018-05-157051716001ND
2018-06-057053754001ND
2018-07-037057077003ND
2018-07-037057077001ND
2018-08-027060231003ND
2018-08-027060231001ND
2018-08-077060647001ND
2018-08-147061503004ND
2018-08-147061503001ND
2018-08-147061503002ND
2018-08-147061503003ND
2018-09-047063575001ND
2018-10-027066538001ND
2018-10-097067280001ND
2018-11-197071544003ND
2018-11-197071544004ND
2018-11-197071544001ND
2018-11-197071544002ND
2018-11-287072200001ND
2018-12-197074419001ND
2019-01-157076606001ND
2019-01-157076606003ND
2019-02-057078364002ND
2019-02-0742960701ND
2019-02-0742960401ND
2019-02-0742960601ND
2019-02-0742960501ND
2019-03-197082788001ND
2019-04-027084234003ND
2019-04-027084234001ND
2019-05-147089459001ND
2019-05-147089459003ND
2019-05-147089459004ND
2019-05-147089462004ND
2019-05-1470894590020.750 ppb
2019-05-147089462001ND
2019-06-037091767001ND
2019-07-097096833003ND
2019-07-097096833001ND
2019-08-057099950003ND
2019-08-057099950001ND
2019-08-1670101654003ND
2019-08-1670101654001ND
2019-08-1670101654004ND
2019-08-1670101654002ND
2019-09-0370103523001ND
2019-09-0370103523003ND
2019-10-0270106994001ND
2019-10-2370109466001ND
2019-11-2170112750002ND
2019-11-2170112750003ND
2019-11-2170112750004ND
2019-11-2170112750001ND
2019-11-2570113095001ND