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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Edinburg

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

 

204

Samples

0

Samples exceeding legal limit (MCL)

137

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.28 ppb3427ND - 3.00 ppb
20151.02 ppb3417ND - 6.90 ppb
20160.788 ppb3416ND - 4.70 ppb
20171.03 ppb3422ND - 2.00 ppb
20181.65 ppb3428ND - 3.60 ppb
20191.42 ppb3427ND - 2.70 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
2014-02-26AC447431.000 ppb
2014-02-26AC447412.50 ppb
2014-02-26AC447212.30 ppb
2014-02-26AC447162.30 ppb
2014-02-26AC447131.70 ppb
2014-02-26AC447151.80 ppb
2014-02-26AC447182.20 ppb
2014-02-26AC447201.60 ppb
2014-04-09AC501761.50 ppb
2014-04-09AC501752.20 ppb
2014-04-09AC50174ND
2014-04-09AC501731.60 ppb
2014-04-09AC501782.60 ppb
2014-04-09AC502001.80 ppb
2014-04-09AC501771.30 ppb
2014-04-09AC501983.00 ppb
2014-07-08AC590150.900 ppb
2014-07-08AC590170.700 ppb
2014-07-08AC59096ND
2014-07-08AC590971.000 ppb
2014-07-08AC590951.10 ppb
2014-07-08AC59081ND
2014-07-08AC590821.20 ppb
2014-07-08AC590831.70 ppb
2014-07-08AC59084ND
2014-07-08AC590871.40 ppb
2014-10-06AC689041.10 ppb
2014-10-06AC688971.10 ppb
2014-10-06AC68901ND
2014-10-06AC68896ND
2014-10-06AC689031.20 ppb
2014-10-06AC689251.20 ppb
2014-10-06AC68913ND
2014-10-06AC689211.50 ppb
2015-02-06AC79663ND
2015-02-06AC79661ND
2015-02-06AC79673ND
2015-02-06AC79698ND
2015-02-06AC79674ND
2015-02-06AC79675ND
2015-02-06AC79694ND
2015-02-06AC796661.000 ppb
2015-04-08AC87662ND
2015-04-08AC87671ND
2015-04-08AC87668ND
2015-04-08AC87666ND
2015-04-08AC87664ND
2015-04-08AC87665ND
2015-04-08AC87667ND
2015-04-08AC87672ND
2015-07-16AC999741.90 ppb
2015-07-16AC999681.30 ppb
2015-07-16AC999073.60 ppb
2015-07-16AC999021.50 ppb
2015-07-16AC999081.70 ppb
2015-07-16AC998971.40 ppb
2015-07-16AC999043.50 ppb
2015-07-16AC999033.70 ppb
2015-07-16AC998981.30 ppb
2015-07-16AC999016.90 ppb
2015-10-19AD109831.000 ppb
2015-10-19AD109681.000 ppb
2015-10-19AD109841.30 ppb
2015-10-19AD10979ND
2015-10-19AD109891.10 ppb
2015-10-19AD109811.30 ppb
2015-10-19AD10969ND
2015-10-19AD109821.20 ppb
2016-01-26AD20044ND
2016-01-26AD20036ND
2016-01-26AD200581.10 ppb
2016-01-26AD20043ND
2016-01-26AD20037ND
2016-01-26AD20035ND
2016-01-26AD20047ND
2016-01-26AD200341.40 ppb
2016-04-26AD341591.10 ppb
2016-04-26AD341601.10 ppb
2016-04-26AD34165ND
2016-04-26AD34163ND
2016-04-26AD34167ND
2016-04-26AD341771.40 ppb
2016-04-26AD34164ND
2016-04-26AD341581.20 ppb
2016-08-02AD466811.10 ppb
2016-08-02AD46683ND
2016-08-02AD466272.20 ppb
2016-08-02AD466241.70 ppb
2016-08-02AD46616ND
2016-08-02AD46600ND
2016-08-02AD466231.20 ppb
2016-08-02AD46619ND
2016-08-02AD46617ND
2016-08-02AD46620ND
2016-10-24AD542681.10 ppb
2016-10-24AD542701.20 ppb
2016-10-24AD54267ND
2016-10-24AD542741.10 ppb
2016-10-24AD54271ND
2016-10-24AD542694.10 ppb
2016-10-24AD542751.10 ppb
2016-10-24AD542724.70 ppb
2017-01-12AD646891.30 ppb
2017-01-12AD64686ND
2017-01-12AD646841.70 ppb
2017-01-12AD64685ND
2017-01-12AD646881.20 ppb
2017-01-12AD646831.70 ppb
2017-01-12AD64687ND
2017-01-12AD646901.50 ppb
2017-04-18AD799281.80 ppb
2017-04-18AD79934ND
2017-04-18AD799361.10 ppb
2017-04-18AD79926ND
2017-04-18AD799301.50 ppb
2017-04-18AD799351.50 ppb
2017-04-18AD79931ND
2017-04-18AD799271.50 ppb
2017-07-13AD893171.70 ppb
2017-07-13AD89315ND
2017-07-13AD892462.00 ppb
2017-07-13AD892421.20 ppb
2017-07-13AD892501.60 ppb
2017-07-13AD89231ND
2017-07-13AD892441.70 ppb
2017-07-13AD892731.90 ppb
2017-07-13AD89238ND
2017-07-13AD892481.80 ppb
2017-10-06AD997661.70 ppb
2017-10-06AD99758ND
2017-10-06AD997611.60 ppb
2017-10-06AD99765ND
2017-10-06AD997591.60 ppb
2017-10-06AD997641.70 ppb
2017-10-06AD99763ND
2017-10-06AD997621.70 ppb
2018-01-25AE105203.10 ppb
2018-01-25AE104831.30 ppb
2018-01-25AE105222.80 ppb
2018-01-25AE10491ND
2018-01-25AE104902.50 ppb
2018-01-25AE105032.80 ppb
2018-01-25AE10489ND
2018-01-25AE105263.60 ppb
2018-04-12AE222762.30 ppb
2018-04-12AE222731.60 ppb
2018-04-12AE222742.40 ppb
2018-04-12AE222721.30 ppb
2018-04-12AE222782.60 ppb
2018-04-12AE222812.60 ppb
2018-04-12AE222751.20 ppb
2018-04-12AE222792.30 ppb
2018-08-29AE388091.40 ppb
2018-08-29AE38819ND
2018-08-29AE387731.30 ppb
2018-08-29AE38772ND
2018-08-29AE387691.60 ppb
2018-08-29AE38770ND
2018-08-29AE387761.30 ppb
2018-08-29AE387681.60 ppb
2018-08-29AE38777ND
2018-08-29AE387741.80 ppb
2018-10-09AE429362.30 ppb
2018-10-09AE429411.80 ppb
2018-10-09AE429341.60 ppb
2018-10-09AE429381.90 ppb
2018-10-09AE429371.80 ppb
2018-10-09AE429352.10 ppb
2018-10-09AE429441.30 ppb
2018-10-09AE429332.00 ppb
2019-02-13AE543282.10 ppb
2019-02-13AE543351.80 ppb
2019-02-13AE543311.80 ppb
2019-02-13AE543372.00 ppb
2019-02-13AE543272.40 ppb
2019-02-13AE543252.30 ppb
2019-02-13AE543291.20 ppb
2019-02-13AE543361.80 ppb
2019-05-01AE642852.30 ppb
2019-05-01AE642841.20 ppb
2019-05-01AE642872.60 ppb
2019-05-01AE642901.10 ppb
2019-05-01AE642832.00 ppb
2019-05-01AE642861.80 ppb
2019-05-01AE64289ND
2019-05-01AE642881.80 ppb
2019-09-06AE825311.80 ppb
2019-09-06AE82527ND
2019-09-06AE824271.70 ppb
2019-09-06AE82434ND
2019-09-06AE824262.00 ppb
2019-09-06AE82449ND
2019-09-06AE824302.00 ppb
2019-09-06AE824332.70 ppb
2019-09-06AE82428ND
2019-09-06AE824312.60 ppb
2019-12-05AE913881.30 ppb
2019-12-05AE913891.000 ppb
2019-12-05AE913901.10 ppb
2019-12-05AE91387ND
2019-12-05AE913861.10 ppb
2019-12-05AE913851.50 ppb
2019-12-05AE91391ND
2019-12-05AE913841.40 ppb