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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

CTWC - Naugatuck Region-Central System

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

 

116

Samples

0

Samples exceeding legal limit (MCL)

103

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
201416.7 ppb2016ND - 30.0 ppb
201521.9 ppb2017ND - 37.0 ppb
201621.7 ppb2019ND - 37.0 ppb
201726.0 ppb1917ND - 49.0 ppb
201824.5 ppb2017ND - 42.0 ppb
201923.4 ppb17175.60 ppb - 33.0 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
2014-02-252226THM14.7 ppb
2014-02-252227THM27.7 ppb
2014-02-252228THM26.3 ppb
2014-03-04BG14936VOC16.40 ppb
2014-03-06BG16206VOC1ND
2014-03-06BG16207VOC1ND
2014-04-29BG38084VOC1ND
2014-05-287179THM6.00 ppb
2014-05-287180THM25.7 ppb
2014-05-287181THM25.6 ppb
2014-05-287182THM25.0 ppb
2014-07-28BG82699VOC1ND
2014-08-26BG99593TTHM13.0 ppb
2014-08-26BG99594TTHM22.0 ppb
2014-08-26BG99595TTHM25.0 ppb
2014-08-26BG99596TTHM23.0 ppb
2014-11-24BH45201TTHM12.0 ppb
2014-11-24BH45202TTHM26.0 ppb
2014-11-24BH45203TTHM30.0 ppb
2014-11-24BH45204TTHM26.0 ppb
2015-02-17BH74013VOC15.00 ppb
2015-02-27BH78479TTHM20.0 ppb
2015-02-27BH78480TTHM34.0 ppb
2015-02-27BH78478TTHM16.0 ppb
2015-02-27BH78481TTHM23.0 ppb
2015-03-16BH83835VOC1ND
2015-03-16BH83838VOC1ND
2015-05-26BJ21443TTHM37.0 ppb
2015-05-26BJ21445TTHM35.0 ppb
2015-05-26BJ21444TTHM37.0 ppb
2015-05-26BJ21442TTHM14.0 ppb
2015-08-18BJ76634TTHM31.0 ppb
2015-08-18BJ76635TTHM28.0 ppb
2015-08-18BJ76636TTHM30.0 ppb
2015-08-18BJ76633TTHM22.0 ppb
2015-11-09BK20857TTHM30.0 ppb
2015-11-09BK20856TTHM18.0 ppb
2015-11-09BK20859TTHM29.0 ppb
2015-11-09BK20858TTHM29.0 ppb
2015-11-11BK21527VOC1ND
2016-01-19BK54678VOC16.40 ppb
2016-02-09BK63010TTHM13.0 ppb
2016-02-09BK63011TTHM32.0 ppb
2016-02-09BK63012TTHM18.0 ppb
2016-02-09BK63013TTHM29.0 ppb
2016-03-09BK76130VOC10.600 ppb
2016-04-12BN12472VOC1ND
2016-05-17BN33271TTHM14.0 ppb
2016-05-17BN33272TTHM37.0 ppb
2016-05-17BN33273TTHM33.0 ppb
2016-05-17BN33274TTHM32.0 ppb
2016-08-16BN92714TTHM21.0 ppb
2016-08-16BN92715TTHM30.0 ppb
2016-08-16BN92716TTHM26.0 ppb
2016-08-16BN92717TTHM29.0 ppb
2016-11-14BV85888VOC14.30 ppb
2016-11-15BV83243TTHM14.0 ppb
2016-11-15BV83244TTHM33.0 ppb
2016-11-15BV83245TTHM34.0 ppb
2016-11-15BV83246TTHM28.0 ppb
2017-01-11BX19357VOC14.80 ppb
2017-01-17BX30447VOC1ND
2017-02-14BX61009TTHM12.0 ppb
2017-02-14BX61010TTHM30.0 ppb
2017-02-14BX61011TTHM26.0 ppb
2017-02-14BX61012TTHM25.0 ppb
2017-05-16BY21158TTHM16.0 ppb
2017-05-16BY21159TTHM49.0 ppb
2017-05-16BY21160TTHM34.0 ppb
2017-05-16BY21161TTHM36.0 ppb
2017-05-23BY28091VOC1ND
2017-08-22BY88369TTHM26.0 ppb
2017-08-22BY88370TTHM38.0 ppb
2017-08-22BY88371TTHM37.0 ppb
2017-08-22BY88372TTHM32.0 ppb
2017-11-20BZ44480TTHM19.0 ppb
2017-11-20BZ44481TTHM37.0 ppb
2017-11-20BZ44482TTHM38.0 ppb
2017-11-20BZ44483TTHM35.0 ppb
2018-01-15BZ72858VOC110.00 ppb
2018-02-13BZ88506VOC1ND
2018-02-14BZ89697TTHM24.0 ppb
2018-02-14BZ89698TTHM37.0 ppb
2018-02-14BZ89699TTHM36.0 ppb
2018-02-14BZ89700TTHM42.0 ppb
2018-05-21CA50437TTHM27.0 ppb
2018-05-21CA50438TTHM15.0 ppb
2018-05-21CA50439TTHM30.0 ppb
2018-05-21CA50440TTHM29.0 ppb
2018-05-21CA50441VOC1ND
2018-06-11CA67845VOC1ND
2018-08-20CB1493920.0 ppb
2018-08-20CB1494032.0 ppb
2018-08-20CB1494132.0 ppb
2018-08-20CB1494232.0 ppb
2018-11-20DBP 20051350233.1 ppb
2018-11-20DBP 20051350434.5 ppb
2018-11-20DBP 20051350619.7 ppb
2018-11-20DBP 20051353436.3 ppb
2019-02-12VOC1 2005213785.60 ppb
2019-02-20DBP 20052244729.4 ppb
2019-02-20DBP 20052244825.5 ppb
2019-02-20DBP 20052244929.7 ppb
2019-02-20DBP 20052245016.7 ppb
2019-05-21DBP 20053325725.0 ppb
2019-05-21DBP 20053325819.2 ppb
2019-05-21DBP 20053325925.7 ppb
2019-05-21DBP 2005332606.40 ppb
2019-08-20DBP 20054589032.9 ppb
2019-08-20DBP 20054589130.4 ppb
2019-08-20DBP 20054589228.5 ppb
2019-08-20DBP 20054589313.8 ppb
2019-11-19DBP 20055740433.0 ppb
2019-11-19DBP 20055740532.2 ppb
2019-11-19DBP 20055740632.1 ppb
2019-11-19DBP 20055740712.5 ppb