Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Chloroform

Sardis Lone Elm WSC

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

 

128

Samples

0

Samples exceeding legal limit (MCL)

59

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20143.20 ppb186ND - 45.1 ppb
20151.95 ppb247ND - 17.0 ppb
20164.85 ppb217ND - 22.3 ppb
20175.00 ppb2215ND - 32.1 ppb
20182.04 ppb229ND - 7.01 ppb
20193.09 ppb2115ND - 7.34 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
2014-03-17Q1408522008ND
2014-03-17Q1408522009ND
2014-03-17Q1408522010ND
2014-03-17Q1408522001ND
2014-04-28Q1413518010ND
2014-04-28Q1413518013ND
2014-04-28Q1413518029ND
2014-04-28Q14135180331.20 ppb
2014-04-28Q1413518034ND
2014-04-28Q1413518035ND
2014-07-29Q14316900062.40 ppb
2014-07-29Q14316900072.00 ppb
2014-07-29Q143169000845.1 ppb
2014-07-29Q1431690011ND
2014-10-24Q14540450034.10 ppb
2014-10-24Q14540450042.80 ppb
2014-10-24Q1454045001ND
2014-10-24Q1454045002ND
2015-03-17Q15098490032.30 ppb
2015-03-17Q15098490042.40 ppb
2015-03-17Q15098490051.50 ppb
2015-03-17Q1509849006ND
2015-04-20Q1514635014ND
2015-04-20Q1514635016ND
2015-04-20Q1514635017ND
2015-04-20Q1514635020ND
2015-04-20Q1514635021ND
2015-04-20Q15146350232.68 ppb
2015-04-20Q15146350244.71 ppb
2015-04-20Q1514635025ND
2015-04-20Q1514635026ND
2015-07-22Q1528430001ND
2015-07-22Q152843000417.0 ppb
2015-07-22Q152843000516.2 ppb
2015-07-22Q1528430006ND
2015-07-22Q1528430007ND
2015-09-10Q1535233002ND
2015-11-19Q1546073001ND
2015-11-19Q1546073002ND
2015-11-19Q1546073003ND
2015-11-19Q1546073004ND
2015-11-19Q1546073006ND
2016-01-25Q1603127008ND
2016-01-25Q1603127001ND
2016-01-25Q1603127004ND
2016-01-25Q1603127015ND
2016-01-25Q1603127018ND
2016-01-25Q1603127019ND
2016-01-25Q1603127020ND
2016-06-23Q162581400118.8 ppb
2016-06-23Q162581400220.1 ppb
2016-06-23Q1625814003ND
2016-06-23Q162581400422.3 ppb
2016-09-02Q163553300312.2 ppb
2016-09-02Q163553300412.3 ppb
2016-09-02Q1635533001ND
2016-09-02Q163553300215.2 ppb
2016-10-27Q1645955001ND
2016-10-27Q1645955004ND
2016-10-27Q1645955010ND
2016-10-27Q1645955011ND
2016-10-27Q1645955012ND
2016-10-27Q16459550131.05 ppb
2017-02-14Q17063630022.41 ppb
2017-02-14Q17063630031.77 ppb
2017-02-14Q1706363001ND
2017-02-14Q1706363004ND
2017-04-06Q1714243032ND
2017-04-06Q17142430261.17 ppb
2017-04-06Q1714243033ND
2017-04-06Q17142430281.56 ppb
2017-04-06Q17142430353.21 ppb
2017-04-06Q17142430223.31 ppb
2017-04-06Q17142430562.94 ppb
2017-04-06Q17142430231.74 ppb
2017-04-06Q1714243057ND
2017-07-11Q17281570034.33 ppb
2017-07-11Q17281570014.62 ppb
2017-07-11Q17281570043.41 ppb
2017-07-11Q1728157002ND
2017-10-16Q17530550012.92 ppb
2017-10-16Q175305501122.7 ppb
2017-10-16Q175305500521.8 ppb
2017-10-16Q175305501232.1 ppb
2017-10-16Q1753055006ND
2018-01-11Q1801694012ND
2018-01-11Q1801694015ND
2018-01-11Q1801694017ND
2018-01-11Q1801694018ND
2018-01-11Q1801694020ND
2018-01-11Q1801694024ND
2018-01-11Q1801694025ND
2018-01-11Q1801694026ND
2018-01-11Q1801694027ND
2018-05-25Q18211650015.03 ppb
2018-05-25Q18211650025.62 ppb
2018-05-25Q18211650037.01 ppb
2018-05-25Q1821165004ND
2018-08-27Q18341760024.58 ppb
2018-08-27Q18341760074.13 ppb
2018-08-27Q18341760044.50 ppb
2018-08-27Q18341760086.18 ppb
2018-08-27Q1834176005ND
2018-11-07Q18445960014.44 ppb
2018-11-07Q1844596002ND
2018-11-07Q18445960033.41 ppb
2018-11-07Q1844596004ND
2019-02-12Q19062790014.89 ppb
2019-02-12Q19062790024.19 ppb
2019-02-12Q19062790032.21 ppb
2019-02-12Q1906279004ND
2019-04-18Q19158750032.54 ppb
2019-04-18Q1915875017ND
2019-04-18Q1915875005ND
2019-04-18Q19158750205.40 ppb
2019-04-18Q19158750082.98 ppb
2019-04-18Q19158750321.17 ppb
2019-04-18Q1915875016ND
2019-04-18Q19158750337.21 ppb
2019-04-18Q1915875006ND
2019-07-25Q19477210015.36 ppb
2019-07-25Q19477210025.70 ppb
2019-07-25Q19477210037.34 ppb
2019-07-25Q19477210041.71 ppb
2019-12-10Q19797680016.28 ppb
2019-12-10Q19797680025.67 ppb
2019-12-10Q19797680032.30 ppb
2019-12-10Q1979768004ND