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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Hewitt

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)

48

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20142.85 ppb1711ND - 6.50 ppb
20155.08 ppb199ND - 32.9 ppb
20160.863 ppb195ND - 5.80 ppb
20171.21 ppb196ND - 6.90 ppb
20181.07 ppb199ND - 4.20 ppb
20192.11 ppb198ND - 8.70 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
2014-01-14AC386652.50 ppb
2014-03-13AC469194.30 ppb
2014-03-13AC469184.60 ppb
2014-03-13AC469404.60 ppb
2014-03-13AC469216.40 ppb
2014-04-17AC510486.50 ppb
2014-04-17AC510525.50 ppb
2014-04-17AC510475.70 ppb
2014-04-17AC510462.40 ppb
2014-09-15AC67016ND
2014-09-15AC67011ND
2014-09-15AC67015ND
2014-09-15AC67020ND
2014-11-18AC72398ND
2014-11-18AC72390ND
2014-11-18AC723942.00 ppb
2014-11-18AC723963.90 ppb
2015-03-23AC85655ND
2015-03-23AC85645ND
2015-03-23AC85649ND
2015-03-23AC854791.40 ppb
2015-03-23AC85480ND
2015-03-23AC854815.20 ppb
2015-03-23AC854835.00 ppb
2015-04-21AC89008ND
2015-04-21AC89006ND
2015-04-21AC890051.70 ppb
2015-04-21AC89014ND
2015-07-15AC9963331.4 ppb
2015-07-15AC9963432.9 ppb
2015-07-15AC99630ND
2015-07-15AC99629ND
2015-10-28AD119747.20 ppb
2015-10-28AD119787.00 ppb
2015-10-28AD119754.70 ppb
2015-10-28AD11977ND
2016-01-20AD19002ND
2016-01-20AD19012ND
2016-01-20AD18923ND
2016-01-20AD18922ND
2016-01-20AD18926ND
2016-01-20AD189245.80 ppb
2016-04-06AD321291.60 ppb
2016-04-06AD32062ND
2016-04-06AD32068ND
2016-04-06AD32064ND
2016-04-06AD320635.60 ppb
2016-07-13AD440611.80 ppb
2016-07-13AD440691.60 ppb
2016-07-13AD44066ND
2016-07-13AD44068ND
2016-10-12AD53151ND
2016-10-12AD53138ND
2016-10-12AD53144ND
2016-10-12AD53143ND
2017-02-06AD69162ND
2017-02-06AD691666.90 ppb
2017-02-06AD69165ND
2017-02-06AD69164ND
2017-04-03AD78087ND
2017-04-03AD78015ND
2017-04-03AD78018ND
2017-04-03AD78017ND
2017-04-03AD78016ND
2017-07-19AD899214.80 ppb
2017-07-19AD899225.00 ppb
2017-07-19AD899261.10 ppb
2017-07-19AD89928ND
2017-10-09AD998142.80 ppb
2017-10-09AD99746ND
2017-10-09AD997412.40 ppb
2017-10-09AD99744ND
2017-10-09AD99747ND
2017-10-31AE03236ND
2018-02-07AE12765ND
2018-02-07AE12741ND
2018-02-07AE12733ND
2018-02-07AE12740ND
2018-02-07AE12732ND
2018-04-19AE232651.30 ppb
2018-04-19AE232631.000 ppb
2018-04-19AE232051.10 ppb
2018-04-19AE232061.10 ppb
2018-04-19AE23214ND
2018-04-19AE232124.20 ppb
2018-08-15AE371743.30 ppb
2018-08-15AE371724.20 ppb
2018-08-15AE37170ND
2018-08-15AE37157ND
2018-11-06AE453521.10 ppb
2018-11-06AE453483.10 ppb
2018-11-06AE45349ND
2018-11-06AE45351ND
2019-02-12AE54094ND
2019-02-12AE54098ND
2019-02-12AE54084ND
2019-02-12AE54027ND
2019-02-12AE540252.40 ppb
2019-02-12AE54023ND
2019-02-12AE54029ND
2019-04-22AE63139ND
2019-04-22AE63138ND
2019-04-22AE63141ND
2019-04-22AE63135ND
2019-08-26AE805198.70 ppb
2019-08-26AE805218.20 ppb
2019-08-26AE805184.90 ppb
2019-08-26AE80522ND
2019-10-17AE868825.80 ppb
2019-10-17AE868836.90 ppb
2019-10-17AE868801.20 ppb
2019-10-17AE868872.00 ppb