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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Sugar Land

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

 

231

Samples

0

Samples exceeding legal limit (MCL)

113

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.03 ppb3418ND - 3.40 ppb
20151.44 ppb3929ND - 3.80 ppb
20161.35 ppb4032ND - 3.70 ppb
20170.921 ppb3819ND - 3.20 ppb
20180.251 ppb397ND - 1.60 ppb
20190.227 ppb418ND - 1.60 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
2014-02-11AC422180.500 ppb
2014-02-11AC42195ND
2014-02-11AC42200ND
2014-02-11AC42192ND
2014-02-11AC42199ND
2014-02-11AC42201ND
2014-02-11AC421933.40 ppb
2014-02-11AC42198ND
2014-04-29AC520551.000 ppb
2014-04-29AC52211ND
2014-04-29AC52192ND
2014-04-29AC52195ND
2014-04-29AC52193ND
2014-04-29AC52212ND
2014-04-29AC521962.00 ppb
2014-04-29AC52171ND
2014-04-29AC52194ND
2014-07-23AC607021.60 ppb
2014-07-23AC607701.30 ppb
2014-07-23AC607392.30 ppb
2014-07-23AC607951.50 ppb
2014-07-23AC607401.90 ppb
2014-07-23AC60769ND
2014-07-23AC60783ND
2014-07-23AC60764ND
2014-07-23AC607651.60 ppb
2014-10-14AC696572.30 ppb
2014-10-14AC696561.90 ppb
2014-10-14AC696552.40 ppb
2014-10-14AC696542.30 ppb
2014-10-14AC696692.40 ppb
2014-10-14AC696483.20 ppb
2014-10-14AC696501.000 ppb
2014-10-14AC696512.40 ppb
2015-01-22AC773671.30 ppb
2015-01-22AC774182.30 ppb
2015-01-22AC774102.30 ppb
2015-01-22AC774192.30 ppb
2015-01-22AC774262.40 ppb
2015-01-22AC774152.40 ppb
2015-01-22AC774272.90 ppb
2015-01-22AC774131.70 ppb
2015-01-22AC774092.20 ppb
2015-04-01AC86976ND
2015-04-01AC869823.80 ppb
2015-04-01AC86978ND
2015-04-01AC869801.40 ppb
2015-04-01AC869742.00 ppb
2015-04-01AC869701.20 ppb
2015-06-02AC942751.30 ppb
2015-06-02AC942681.60 ppb
2015-06-02AC942761.20 ppb
2015-06-02AC942691.40 ppb
2015-06-02AC94288ND
2015-06-02AC942781.60 ppb
2015-06-02AC94261ND
2015-06-02AC942871.20 ppb
2015-07-16AC99936ND
2015-07-16AC99920ND
2015-07-16AC999321.10 ppb
2015-07-16AC999301.30 ppb
2015-07-16AC99911ND
2015-07-16AC999192.40 ppb
2015-07-16AC99929ND
2015-07-16AC99927ND
2015-11-04AD126022.00 ppb
2015-11-04AD126152.00 ppb
2015-11-04AD126122.00 ppb
2015-11-04AD125692.20 ppb
2015-11-04AD126131.40 ppb
2015-11-04AD125683.30 ppb
2015-11-04AD12609ND
2015-11-04AD126141.90 ppb
2016-02-02AD214661.10 ppb
2016-02-02AD214621.40 ppb
2016-02-02AD214641.20 ppb
2016-02-02AD21458ND
2016-02-02AD21456ND
2016-02-02AD214601.40 ppb
2016-02-02AD214361.50 ppb
2016-02-02AD21431ND
2016-02-02AD214381.70 ppb
2016-02-02AD214391.40 ppb
2016-02-02AD214331.40 ppb
2016-02-02AD214372.20 ppb
2016-02-02AD214411.10 ppb
2016-02-02AD214421.60 ppb
2016-04-19AD335741.50 ppb
2016-04-19AD335771.30 ppb
2016-04-19AD335641.40 ppb
2016-04-19AD335721.70 ppb
2016-04-19AD335731.20 ppb
2016-04-19AD335752.50 ppb
2016-04-19AD335681.30 ppb
2016-04-19AD335781.30 ppb
2016-09-01AD476461.70 ppb
2016-09-01AD476792.00 ppb
2016-09-01AD476431.40 ppb
2016-09-01AD476502.40 ppb
2016-09-01AD476471.60 ppb
2016-09-01AD476813.70 ppb
2016-09-01AD476481.10 ppb
2016-09-01AD476442.00 ppb
2016-09-01AD476882.20 ppb
2016-10-05AD525341.60 ppb
2016-10-05AD52537ND
2016-10-05AD525391.90 ppb
2016-10-05AD525282.30 ppb
2016-10-05AD52536ND
2016-10-05AD52538ND
2016-10-05AD52530ND
2016-10-05AD525321.70 ppb
2016-10-05AD52573ND
2017-01-04AD629871.50 ppb
2017-01-04AD629582.30 ppb
2017-01-04AD629682.00 ppb
2017-01-04AD629532.30 ppb
2017-01-04AD629661.80 ppb
2017-01-04AD62961ND
2017-01-04AD62960ND
2017-01-04AD62954ND
2017-01-04AD629552.30 ppb
2017-03-22AD76345ND
2017-03-22AD76323ND
2017-03-22AD76341ND
2017-03-22AD76321ND
2017-04-03AD78053ND
2017-04-03AD780291.40 ppb
2017-04-03AD780331.20 ppb
2017-04-03AD78027ND
2017-04-03AD780321.40 ppb
2017-04-03AD78026ND
2017-04-03AD780311.30 ppb
2017-04-03AD78030ND
2017-04-03AD78028ND
2017-07-05AD883051.90 ppb
2017-07-05AD88306ND
2017-07-05AD883021.50 ppb
2017-07-05AD882991.90 ppb
2017-07-05AD88303ND
2017-07-05AD883013.20 ppb
2017-07-05AD88304ND
2017-07-05AD883001.90 ppb
2017-10-02AD987632.10 ppb
2017-10-02AD98776ND
2017-10-02AD98780ND
2017-10-02AD987701.20 ppb
2017-10-02AD98774ND
2017-10-02AD987771.80 ppb
2017-10-02AD98781ND
2017-10-02AD987792.00 ppb
2018-01-10AE08621ND
2018-01-10AE08617ND
2018-01-10AE08619ND
2018-01-10AE08587ND
2018-01-10AE08586ND
2018-01-10AE08589ND
2018-01-10AE08588ND
2018-01-10AE08590ND
2018-01-10AE08592ND
2018-01-10AE08593ND
2018-01-10AE08591ND
2018-04-10AE21877ND
2018-04-10AE21862ND
2018-04-10AE21863ND
2018-04-10AE21859ND
2018-04-10AE21879ND
2018-04-10AE21858ND
2018-04-10AE21882ND
2018-04-10AE21857ND
2018-06-08AE29244ND
2018-06-08AE29242ND
2018-06-08AE29254ND
2018-07-02AE32202ND
2018-07-02AE32199ND
2018-07-02AE32203ND
2018-07-02AE32173ND
2018-07-02AE32176ND
2018-07-02AE32198ND
2018-07-02AE32201ND
2018-07-02AE32174ND
2018-10-01AE422181.60 ppb
2018-10-01AE422201.50 ppb
2018-10-01AE422171.30 ppb
2018-10-01AE422141.20 ppb
2018-10-01AE422191.50 ppb
2018-10-01AE422111.40 ppb
2018-10-01AE42216ND
2018-10-01AE422091.30 ppb
2018-12-10AE48388ND
2019-01-17AE50522ND
2019-01-17AE50520ND
2019-01-17AE50518ND
2019-01-17AE50503ND
2019-01-17AE50504ND
2019-01-17AE50505ND
2019-01-17AE50506ND
2019-01-17AE50499ND
2019-01-17AE50500ND
2019-01-17AE50501ND
2019-01-17AE50502ND
2019-03-08AE57813ND
2019-03-08AE57815ND
2019-03-08AE57831ND
2019-03-08AE57835ND
2019-04-08AE61436ND
2019-04-08AE61344ND
2019-04-08AE61349ND
2019-04-08AE61352ND
2019-04-08AE61361ND
2019-04-08AE61359ND
2019-04-08AE61360ND
2019-04-08AE61362ND
2019-04-08AE61327ND
2019-07-08AE73446ND
2019-07-08AE73416ND
2019-07-08AE73411ND
2019-07-08AE734101.10 ppb
2019-07-08AE734091.20 ppb
2019-07-08AE73417ND
2019-07-08AE73413ND
2019-07-08AE734191.10 ppb
2019-07-08AE73408ND
2019-10-09AE861191.000 ppb
2019-10-09AE86113ND
2019-10-09AE860951.000 ppb
2019-10-09AE861031.30 ppb
2019-10-09AE86104ND
2019-10-09AE860921.60 ppb
2019-10-09AE86101ND
2019-10-09AE860981.000 ppb