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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Hoosick Falls

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

 

81

Samples

0

Samples exceeding legal limit (MCL)

43

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20148.96 ppb992.30 ppb - 24.5 ppb
20154.59 ppb12122.40 ppb - 10.3 ppb
20160.578 ppb186ND - 2.90 ppb
20171.11 ppb159ND - 3.50 ppb
20180.414 ppb143ND - 2.70 ppb
20190.446 ppb134ND - 1.70 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
2014-06-09JH14036918.30 ppb
2014-06-09JH14036937.10 ppb
2014-06-09JH14036893.00 ppb
2014-09-18JH140678916.7 ppb
2014-09-18JH14067852.30 ppb
2014-09-18JH140678724.5 ppb
2014-12-16JH14088716.60 ppb
2014-12-16JH14088735.60 ppb
2014-12-16JH14088696.50 ppb
2015-03-17JH15016352.40 ppb
2015-03-17JH15016392.80 ppb
2015-03-17JH15016373.00 ppb
2015-03-17JH15016413.70 ppb
2015-09-21JH15065488.30 ppb
2015-09-21JH15065503.70 ppb
2015-09-21JH15065545.20 ppb
2015-09-21JH150655210.3 ppb
2015-12-11JH15084086.20 ppb
2015-12-11JH15084044.20 ppb
2015-12-11JH15084062.80 ppb
2015-12-11JH15084022.50 ppb
2016-03-21JH1601919ND
2016-03-21JH1601921ND
2016-03-21JH1601920ND
2016-03-21JH1601918ND
2016-03-21JH1601924ND
2016-03-21JH1601922ND
2016-06-14JH16048711.60 ppb
2016-06-14JH1604875ND
2016-06-14JH1604873ND
2016-06-14JH16048691.20 ppb
2016-09-22JH16082522.10 ppb
2016-09-22JH16082581.20 ppb
2016-09-22JH16082542.90 ppb
2016-09-22JH16082561.40 ppb
2016-12-20JH1611114ND
2016-12-20JH1611110ND
2016-12-20JH1611112ND
2016-12-20JH1611108ND
2017-03-27JH1702120ND
2017-03-27JH1702116ND
2017-03-27JH1702118ND
2017-06-20JH1704145ND
2017-06-20JH14041511.70 ppb
2017-06-20JH17041471.10 ppb
2017-06-20JH14041491.70 ppb
2017-09-20JH17077291.60 ppb
2017-09-20JH17077312.60 ppb
2017-09-20JH17077333.50 ppb
2017-09-20JH17077271.70 ppb
2017-12-11JH1709837ND
2017-12-11JH17098411.40 ppb
2017-12-11JH1709839ND
2017-12-11JH17098431.40 ppb
2018-02-20JH1801169ND
2018-02-20JH1801171-72ND
2018-02-20JH1801171ND
2018-02-20JH1801165ND
2018-02-20JH1801167ND
2018-06-18JH1804228ND
2018-06-18JH18042332.00 ppb
2018-06-18JH18042312.70 ppb
2018-06-18JH1804229ND
2018-06-18JH1804227ND
2018-12-11JH809749ND
2018-12-11JH1809751ND
2018-12-11JH18097501.10 ppb
2018-12-11JH1809748ND
2019-03-11JH1901458ND
2019-03-11JH1901460ND
2019-03-11JH1901456ND
2019-03-11JH1901454ND
2019-06-12JH1903676-DBP1.70 ppb
2019-06-12JH1903674-THM1.30 ppb
2019-06-12JH1903675-THMND
2019-06-12JH19036761.70 ppb
2019-06-12JH1903673-THM1.10 ppb
2019-12-09JH1908728ND
2019-12-09JH1908731ND
2019-12-09JH1908730ND
2019-12-09JH1908729ND