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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of White Settlement

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

 

119

Samples

0

Samples exceeding legal limit (MCL)

93

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20142.39 ppb16161.10 ppb - 4.90 ppb
20152.98 ppb2216ND - 7.47 ppb
20162.35 ppb2115ND - 9.07 ppb
20171.32 ppb2113ND - 4.29 ppb
20182.42 ppb2016ND - 5.27 ppb
20193.07 ppb1917ND - 5.36 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
2014-03-18Q14086140012.00 ppb
2014-03-18Q14086140021.40 ppb
2014-03-18Q14086140031.20 ppb
2014-03-18Q14086140042.00 ppb
2014-04-22Q14129660012.00 ppb
2014-04-22Q14129660022.30 ppb
2014-04-22Q14129660031.10 ppb
2014-04-22Q14129660042.30 ppb
2014-09-29Q14489930072.50 ppb
2014-09-29Q14489930084.70 ppb
2014-09-29Q14489930093.30 ppb
2014-09-29Q14489930102.20 ppb
2014-12-04Q14585580024.90 ppb
2014-12-04Q14585580032.40 ppb
2014-12-04Q14585580042.10 ppb
2014-12-04Q14585580011.90 ppb
2015-01-26Q1502775001ND
2015-01-26Q1502775003ND
2015-01-26Q1502775006ND
2015-01-26Q1502775007ND
2015-01-26Q1502775010ND
2015-01-26Q1502775011ND
2015-01-26Q15027750251.70 ppb
2015-01-26Q15027750261.40 ppb
2015-01-26Q15027750272.00 ppb
2015-01-26Q15027750281.80 ppb
2015-04-27Q15154720013.66 ppb
2015-04-27Q15154720025.08 ppb
2015-04-27Q15154720034.76 ppb
2015-04-27Q15154720044.69 ppb
2015-08-11Q15318390046.65 ppb
2015-08-11Q15318390016.88 ppb
2015-08-11Q15318390027.42 ppb
2015-08-11Q15318390037.47 ppb
2015-10-19Q15412140012.71 ppb
2015-10-19Q15412140023.27 ppb
2015-10-19Q15412140033.08 ppb
2015-10-19Q15412140043.00 ppb
2016-01-25Q1603160001ND
2016-01-25Q16031600041.79 ppb
2016-01-25Q1603160005ND
2016-01-25Q16031600142.84 ppb
2016-01-25Q16031600152.22 ppb
2016-01-25Q16031600162.16 ppb
2016-01-25Q16031600172.17 ppb
2016-04-28Q16168200022.44 ppb
2016-04-28Q16168200032.40 ppb
2016-04-28Q16168200042.34 ppb
2016-04-28Q16168200052.26 ppb
2016-08-04Q16324020019.07 ppb
2016-08-04Q16324020024.61 ppb
2016-08-04Q16324020035.21 ppb
2016-08-04Q16324020045.16 ppb
2016-11-17Q1650436011ND
2016-11-17Q1650436014ND
2016-11-17Q16504360032.75 ppb
2016-11-17Q16504360041.88 ppb
2016-11-17Q1650436005ND
2016-11-17Q1650436006ND
2017-01-19Q1702494002ND
2017-01-19Q1702494004ND
2017-01-19Q17024940221.53 ppb
2017-01-19Q1702494023ND
2017-01-19Q1702494025ND
2017-01-19Q1702494024ND
2017-05-03Q17183170011.79 ppb
2017-05-03Q17183170031.57 ppb
2017-05-03Q17183170204.00 ppb
2017-05-03Q17183170211.71 ppb
2017-05-03Q17183170221.65 ppb
2017-05-03Q17183170232.35 ppb
2017-08-02Q1732337002ND
2017-08-02Q17323370094.29 ppb
2017-08-02Q17323370101.99 ppb
2017-08-02Q17323370112.18 ppb
2017-08-02Q17323370122.02 ppb
2017-11-09Q17575200011.51 ppb
2017-11-09Q17575200031.20 ppb
2017-11-09Q1757520002ND
2017-11-09Q1757520004ND
2018-01-22Q18022910022.09 ppb
2018-01-22Q18022910034.64 ppb
2018-01-22Q18022910041.70 ppb
2018-01-22Q18022910051.61 ppb
2018-05-22Q18207300013.44 ppb
2018-05-22Q18207300022.02 ppb
2018-05-22Q18207300032.18 ppb
2018-05-22Q18207300041.50 ppb
2018-06-18Q18240130041.65 ppb
2018-06-18Q1824013006ND
2018-07-16Q1827873008ND
2018-07-16Q1827873002ND
2018-07-16Q18278730102.27 ppb
2018-07-16Q18278730052.81 ppb
2018-07-16Q1827873011ND
2018-07-16Q18278730062.10 ppb
2018-10-25Q18427240015.04 ppb
2018-10-25Q18427240025.15 ppb
2018-10-25Q18427240035.01 ppb
2018-10-25Q18427240045.27 ppb
2019-01-31Q1904741011ND
2019-01-31Q19047410042.30 ppb
2019-01-31Q19047410082.30 ppb
2019-01-31Q19047410162.89 ppb
2019-01-31Q19047410092.79 ppb
2019-01-31Q19047410023.03 ppb
2019-05-20Q1926718001ND
2019-05-20Q19267180065.36 ppb
2019-05-20Q19267180074.61 ppb
2019-05-20Q19267180084.28 ppb
2019-05-20Q19267180094.65 ppb
2019-09-13Q19652790014.53 ppb
2019-09-13Q19652790022.93 ppb
2019-09-13Q19652790032.17 ppb
2019-09-13Q19652790042.71 ppb
2019-11-05Q19750960012.99 ppb
2019-11-05Q19750960024.00 ppb
2019-11-05Q19750960033.09 ppb
2019-11-05Q19750960043.64 ppb