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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Pflugerville

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

 

112

Samples

0

Samples exceeding legal limit (MCL)

85

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20142.17 ppb1711ND - 7.00 ppb
20152.16 ppb1915ND - 5.70 ppb
20160.889 ppb199ND - 3.40 ppb
20171.88 ppb1913ND - 11.7 ppb
20182.94 ppb19191.000 ppb - 9.70 ppb
20198.53 ppb1918ND - 17.0 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
2014-03-12AC467481.60 ppb
2014-03-12AC46735ND
2014-03-12AC46736ND
2014-03-12AC46751ND
2014-06-24AC579054.70 ppb
2014-06-24AC578993.70 ppb
2014-06-24AC578981.30 ppb
2014-06-24AC57902ND
2014-08-27AC652750.600 ppb
2014-08-27AC653141.20 ppb
2014-08-27AC653101.000 ppb
2014-08-27AC65301ND
2014-08-27AC65312ND
2014-11-24AC727767.00 ppb
2014-11-24AC727405.90 ppb
2014-11-24AC727465.10 ppb
2014-11-24AC727744.80 ppb
2015-02-11AC802391.90 ppb
2015-02-11AC802411.000 ppb
2015-02-11AC801895.50 ppb
2015-02-11AC801873.80 ppb
2015-02-11AC801913.80 ppb
2015-02-11AC801883.00 ppb
2015-05-27AC935191.80 ppb
2015-05-27AC93523ND
2015-05-27AC93518ND
2015-05-27AC93522ND
2015-08-17AD043811.50 ppb
2015-08-17AD042635.70 ppb
2015-08-17AD042603.10 ppb
2015-08-17AD042641.50 ppb
2015-08-17AD04257ND
2015-11-04AD126233.00 ppb
2015-11-04AD126191.70 ppb
2015-11-04AD126161.80 ppb
2015-11-04AD125671.90 ppb
2016-02-08AD224213.40 ppb
2016-02-08AD224171.60 ppb
2016-02-08AD224031.40 ppb
2016-02-08AD224221.60 ppb
2016-04-28AD34684ND
2016-04-28AD346301.20 ppb
2016-04-28AD346311.20 ppb
2016-04-28AD34629ND
2016-04-28AD34632ND
2016-07-25AD45460ND
2016-07-25AD454222.50 ppb
2016-07-25AD45413ND
2016-07-25AD45407ND
2016-07-25AD45415ND
2016-11-01AD558182.80 ppb
2016-11-01AD55821ND
2016-11-01AD55820ND
2016-11-01AD55816ND
2016-11-29AD594011.20 ppb
2017-01-24AD66466ND
2017-01-24AD664073.80 ppb
2017-01-24AD66421ND
2017-01-24AD66416ND
2017-01-24AD66417ND
2017-05-22AD850123.40 ppb
2017-05-22AD850192.40 ppb
2017-05-22AD850111.90 ppb
2017-05-22AD850233.00 ppb
2017-08-17AD934101.20 ppb
2017-08-17AD93412ND
2017-08-17AD933921.40 ppb
2017-08-17AD933851.40 ppb
2017-08-17AD93387ND
2017-08-17AD933911.10 ppb
2017-10-25AE0207011.7 ppb
2017-10-25AE020671.50 ppb
2017-10-25AE020711.30 ppb
2017-10-25AE020731.70 ppb
2018-03-08AE175731.000 ppb
2018-03-08AE174914.90 ppb
2018-03-08AE174901.40 ppb
2018-03-08AE175101.50 ppb
2018-03-08AE175011.70 ppb
2018-05-07AE253272.60 ppb
2018-05-07AE253262.00 ppb
2018-05-07AE253172.00 ppb
2018-05-07AE253161.80 ppb
2018-08-14AE369731.20 ppb
2018-08-14AE369751.000 ppb
2018-08-14AE368652.80 ppb
2018-08-14AE368722.00 ppb
2018-08-14AE368732.50 ppb
2018-08-14AE368872.90 ppb
2018-11-13AE458944.80 ppb
2018-11-13AE459023.20 ppb
2018-11-13AE459046.80 ppb
2018-11-13AE458979.70 ppb
2019-02-14AE54604ND
2019-02-14AE546281.20 ppb
2019-02-14AE545712.00 ppb
2019-02-14AE545772.20 ppb
2019-02-14AE545722.30 ppb
2019-02-14AE545732.50 ppb
2019-05-06AE6483813.1 ppb
2019-05-06AE6483311.5 ppb
2019-05-06AE6483710.1 ppb
2019-05-06AE648346.10 ppb
2019-08-19AE7932212.0 ppb
2019-08-19AE7920817.0 ppb
2019-08-19AE7923114.4 ppb
2019-08-19AE792294.60 ppb
2019-08-19AE792256.80 ppb
2019-11-21AE9012314.4 ppb
2019-11-21AE9012015.6 ppb
2019-11-21AE9012214.5 ppb
2019-11-21AE9011711.7 ppb