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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Quail Valley Utility District

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

 

116

Samples

0

Samples exceeding legal limit (MCL)

11

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.31 ppb173ND - 13.6 ppb
20151.38 ppb235ND - 14.9 ppb
20160.584 ppb192ND - 6.60 ppb
20170.311 ppb191ND - 5.90 ppb
2018ND190ND
2019ND190ND

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
2014-02-20AC43834ND
2014-02-20AC43837ND
2014-02-20AC43838ND
2014-02-20AC43844ND
2014-05-21AC549443.20 ppb
2014-05-21AC54938ND
2014-05-21AC54942ND
2014-05-21AC54971ND
2014-05-21Q1417154001ND
2014-08-05AC621885.40 ppb
2014-08-05AC62206ND
2014-08-05AC62207ND
2014-08-05AC62183ND
2014-10-28AC7076613.6 ppb
2014-10-28AC70773ND
2014-10-28AC70770ND
2014-10-28AC70777ND
2015-02-10AC798884.50 ppb
2015-02-10AC79911ND
2015-02-10AC79889ND
2015-02-10AC79887ND
2015-05-13AC917974.50 ppb
2015-05-13AC91791ND
2015-05-13AC91795ND
2015-05-13AC91793ND
2015-05-14AC920611.50 ppb
2015-05-14AC92057ND
2015-05-14AC92055ND
2015-09-24AD0842714.9 ppb
2015-09-24AD08432ND
2015-09-24AD08431ND
2015-09-24AD08428ND
2015-09-24AD08496ND
2015-09-24AD08514ND
2015-12-10AD164846.40 ppb
2015-12-10AD16490ND
2015-12-10AD16489ND
2015-12-10AD16487ND
2015-12-10AD16594ND
2015-12-10AD16510ND
2016-02-18AD242754.50 ppb
2016-02-18AD24280ND
2016-02-18AD24279ND
2016-02-18AD24278ND
2016-04-26AD34198ND
2016-04-26AD34210ND
2016-04-26AD34204ND
2016-04-26AD341736.60 ppb
2016-04-26AD34184ND
2016-04-26AD34174ND
2016-04-26AD34176ND
2016-09-22AD50655ND
2016-09-22AD50654ND
2016-09-22AD50649ND
2016-09-22AD50658ND
2016-10-19AD53752ND
2016-10-19AD53753ND
2016-10-19AD53751ND
2016-10-19AD53754ND
2017-01-18AD65343ND
2017-01-18AD65342ND
2017-01-18AD65340ND
2017-01-18AD65341ND
2017-03-29AD77454ND
2017-03-29AD77456ND
2017-03-29AD77452ND
2017-04-12AD79419ND
2017-04-12AD79416ND
2017-04-12AD79418ND
2017-04-12AD79420ND
2017-08-02AD918045.90 ppb
2017-08-02AD91806ND
2017-08-02AD91807ND
2017-08-02AD91805ND
2017-10-11AE00329ND
2017-10-11AE00354ND
2017-10-11AE00331ND
2017-10-11AE00353ND
2018-02-28AE16061ND
2018-02-28AE16012ND
2018-02-28AE15983ND
2018-02-28AE15984ND
2018-02-28AE16006ND
2018-05-29AE27906ND
2018-05-29AE27914ND
2018-05-29AE27853ND
2018-05-29AE27869ND
2018-05-29AE27868ND
2018-05-29AE27858ND
2018-07-24AE34296ND
2018-07-24AE34306ND
2018-07-24AE34297ND
2018-07-24AE34300ND
2018-10-04AE42686ND
2018-10-04AE42690ND
2018-10-04AE42689ND
2018-10-04AE42687ND
2019-01-30AE52156ND
2019-01-30AE52151ND
2019-01-30AE52152ND
2019-01-30AE52153ND
2019-03-13AE58247ND
2019-03-13AE58241ND
2019-03-13AE58243ND
2019-04-18AE62930ND
2019-04-18AE62929ND
2019-04-18AE62926ND
2019-04-18AE62928ND
2019-08-12AE77980ND
2019-08-12AE77976ND
2019-08-12AE77978ND
2019-08-12AE77977ND
2019-10-16AE86755ND
2019-10-16AE86749ND
2019-10-16AE86753ND
2019-10-16AE86754ND