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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Scarsdale Water Department

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

 

96

Samples

0

Samples exceeding legal limit (MCL)

96

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201429.8 ppb16164.10 ppb - 42.0 ppb
201526.5 ppb161615.0 ppb - 44.0 ppb
201634.6 ppb161624.0 ppb - 46.0 ppb
201731.8 ppb161623.0 ppb - 40.0 ppb
201835.5 ppb161625.0 ppb - 49.0 ppb
201931.1 ppb161619.0 ppb - 40.0 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
2014-01-17201401200021DBP32.0 ppb
2014-01-17201401200020DBP23.0 ppb
2014-01-17201401200019DBP24.0 ppb
2014-01-17201401200022DBP29.0 ppb
2014-04-17201404180351DBP37.0 ppb
2014-04-17201404180349DBP4.10 ppb
2014-04-17201404180348DBP36.0 ppb
2014-04-17201404180350DBP31.0 ppb
2014-07-17201407180424DBP34.0 ppb
2014-07-17201407180423DBP25.0 ppb
2014-07-17201407180425DBP42.0 ppb
2014-07-17201407180422DBP26.0 ppb
2014-10-17201410180109 DBP38.0 ppb
2014-10-17201410180106 DBP32.0 ppb
2014-10-17201410180108 DBP30.0 ppb
2014-10-17201410180107 DBP33.0 ppb
2015-01-16201501170042DBP22.0 ppb
2015-01-16201501170044DBP21.0 ppb
2015-01-16201501170043DBP25.0 ppb
2015-01-16201501170045DBP27.0 ppb
2015-04-17201504180152DBP31.0 ppb
2015-04-17201504180149DBP24.0 ppb
2015-04-17201504180150DBP26.0 ppb
2015-04-17201504180151DBP27.0 ppb
2015-07-28201507290516 DBP44.0 ppb
2015-07-28201507290517 DBP17.0 ppb
2015-07-28201507290515 DBP27.0 ppb
2015-07-28201507290514 DBP15.0 ppb
2015-10-15201510160388 DBP38.0 ppb
2015-10-15201510160387 DBP28.0 ppb
2015-10-15201510160385 DBP26.0 ppb
2015-10-15201510160386 DBP26.0 ppb
2016-01-20201601210649 Q134.0 ppb
2016-01-21201601210651 DBP41.0 ppb
2016-01-21201601210648 DBP32.0 ppb
2016-01-21201601210650 Q139.0 ppb
2016-04-18201604190506 DBP39.0 ppb
2016-04-18201604190507 DBP34.0 ppb
2016-04-18201604190509 DBP40.0 ppb
2016-04-18201604190508 DBP42.0 ppb
2016-07-18201607190663 DBP33.0 ppb
2016-07-18201607190661 DBP46.0 ppb
2016-07-18201607190662 DBP24.0 ppb
2016-07-18201607190664 DBP33.0 ppb
2016-10-17201610180613 DBP24.0 ppb
2016-10-17201610180614 DBP28.0 ppb
2016-10-17201610180615 DBP36.0 ppb
2016-10-17201610180616 DBP29.0 ppb
2017-01-17201701180836 DBP29.0 ppb
2017-01-17201701180838 DBP32.0 ppb
2017-01-17201701180837 DBP36.0 ppb
2017-01-17201701180835 DBP27.0 ppb
2017-04-17201704180814-DBP32.0 ppb
2017-04-17201704180816-DBP35.0 ppb
2017-04-17201704180815-DBP38.0 ppb
2017-04-17201704180813-DBP38.0 ppb
2017-07-17201707180302-DBP40.0 ppb
2017-07-17201707180304-DBP33.0 ppb
2017-07-17201707180301-DBP29.0 ppb
2017-07-17201707180303-DBP23.0 ppb
2017-10-17201710180633-DBP23.0 ppb
2017-10-17201710180632-DBP28.0 ppb
2017-10-17201710180635-DBP32.0 ppb
2017-10-17201710180634-DBP33.0 ppb
2018-01-17201801180351-DBP26.0 ppb
2018-01-17201801180352-DBP27.0 ppb
2018-01-17201801180349-DBP32.0 ppb
2018-01-17201801180350-DBP25.0 ppb
2018-04-17201804180721-DBP36.0 ppb
2018-04-17201804180722-DBP44.0 ppb
2018-04-17201804180719-DBP42.0 ppb
2018-04-17201804180720-DBP31.0 ppb
2018-07-17201807200433-DBP31.0 ppb
2018-07-17201807200435-DBP37.0 ppb
2018-07-17201807200437-DBP39.0 ppb
2018-07-17201807200439-DBP38.0 ppb
2018-10-17201810180782-DBP33.0 ppb
2018-10-17201810180781-DBP38.0 ppb
2018-10-17201810180784-DBP40.0 ppb
2018-10-17201810180783-DBP49.0 ppb
2019-01-17201901180376-DBP40.0 ppb
2019-01-17201901180373-DBP38.0 ppb
2019-01-17201901180375-DBP38.0 ppb
2019-01-17201901180374-DBP37.0 ppb
2019-04-17201904180643-DBP33.0 ppb
2019-04-17201904180641-DBP39.0 ppb
2019-04-17201904180644-DBP40.0 ppb
2019-04-17201904180642-DBP19.0 ppb
2019-07-17201907180458-DBP25.0 ppb
2019-07-17201907180457-DBP26.0 ppb
2019-07-17201907180459-DBP20.0 ppb
2019-07-17201907180460-DBP30.0 ppb
2019-10-17201910180233-DBP33.0 ppb
2019-10-17201910180232-DBP26.0 ppb
2019-10-17201910180230-DBP30.0 ppb
2019-10-17201910180231-DBP23.0 ppb