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EWG's Tap Water Database — 2019 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.

 

186

Samples

0

Samples exceeding legal limit (MCL)

99

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND100ND
20130.0680 ppb251ND - 1.70 ppb
20141.03 ppb3418ND - 3.40 ppb
20151.44 ppb3929ND - 3.80 ppb
20161.35 ppb4032ND - 3.70 ppb
20170.921 ppb3819ND - 3.20 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
2012-05-11AB89673ND
2012-05-11AB89674ND
2012-05-11AB89668ND
2012-05-11AB89670ND
2012-05-11AB89669ND
2012-08-23AB99562ND
2012-10-02AC02426ND
2012-10-02AC02428ND
2012-10-02AC02424ND
2012-10-02AC02425ND
2013-01-24AC08664ND
2013-01-24AC08651ND
2013-01-24AC08654ND
2013-01-24AC08655ND
2013-04-24AC17664ND
2013-04-24AC17665ND
2013-04-24AC17663ND
2013-04-24AC17666ND
2013-07-15AC24585ND
2013-07-15AC24589ND
2013-07-15AC24591ND
2013-07-15AC24590ND
2013-07-15AC24594ND
2013-07-15AC24593ND
2013-07-15AC24592ND
2013-07-15AC24595ND
2013-11-08AC34713ND
2013-11-08AC34709ND
2013-11-08AC34711ND
2013-11-08AC34710ND
2013-11-08AC34715ND
2013-11-08AC347121.70 ppb
2013-11-08AC34708ND
2013-11-08AC34714ND
2013-12-03AC36506ND
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