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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Del Rio Utilities Commission

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

 

102

Samples

0

Samples exceeding legal limit (MCL)

68

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.600 ppb178ND - 1.60 ppb
20156.65 ppb1712ND - 19.4 ppb
20165.59 ppb1716ND - 17.3 ppb
20170.629 ppb177ND - 1.80 ppb
20182.58 ppb1711ND - 13.2 ppb
20191.39 ppb1714ND - 3.10 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
2014-03-27AC485221.20 ppb
2014-03-27AC485201.20 ppb
2014-03-27AC485211.40 ppb
2014-03-27AC48523ND
2014-06-03AC55846ND
2014-06-03AC55847ND
2014-06-03AC558451.60 ppb
2014-06-03AC55881ND
2014-07-10AC59299ND
2014-07-10AC593851.10 ppb
2014-07-10AC59352ND
2014-07-10AC59358ND
2014-07-10AC59356ND
2014-12-17AC752921.40 ppb
2014-12-17AC752891.20 ppb
2014-12-17AC752941.10 ppb
2014-12-17AC75291ND
2015-03-10AC83586ND
2015-03-10AC83583ND
2015-03-10AC83587ND
2015-03-10AC83585ND
2015-06-02AC9438112.9 ppb
2015-06-02AC9438210.1 ppb
2015-06-02AC9439912.4 ppb
2015-06-02AC9440710.00 ppb
2015-08-18AD04570ND
2015-08-18AD045232.70 ppb
2015-08-18AD045261.90 ppb
2015-08-18AD045251.30 ppb
2015-08-18AD045241.30 ppb
2015-11-09AD1297819.4 ppb
2015-11-09AD1297613.5 ppb
2015-11-09AD1296714.1 ppb
2015-11-09AD1296813.4 ppb
2016-02-23AD251864.30 ppb
2016-02-23AD251891.70 ppb
2016-02-23AD251842.80 ppb
2016-02-23AD251882.00 ppb
2016-05-19AD374921.90 ppb
2016-05-19AD374901.60 ppb
2016-05-19AD374941.20 ppb
2016-05-19AD37495ND
2016-09-07AD4824515.0 ppb
2016-09-07AD4823817.3 ppb
2016-09-07AD4823711.4 ppb
2016-09-07AD4824012.2 ppb
2016-09-07AD482438.00 ppb
2016-11-07AD567873.40 ppb
2016-11-07AD567784.00 ppb
2016-11-07AD567984.90 ppb
2016-11-07AD567813.40 ppb
2017-03-21AD765751.30 ppb
2017-03-21AD765741.80 ppb
2017-03-21AD765761.40 ppb
2017-03-21AD76577ND
2017-05-02AD821391.70 ppb
2017-05-02AD821401.80 ppb
2017-05-02AD821381.70 ppb
2017-05-02AD82125ND
2017-08-15AD93094ND
2017-08-15AD93053ND
2017-08-15AD93052ND
2017-08-15AD93054ND
2017-08-15AD93055ND
2017-11-29AE06129ND
2017-11-29AE061271.000 ppb
2017-11-29AE06126ND
2017-11-29AE06128ND
2018-02-21AE147071.000 ppb
2018-02-21AE147011.80 ppb
2018-02-21AE147001.70 ppb
2018-02-21AE146991.10 ppb
2018-04-17AE22759ND
2018-04-17AE22753ND
2018-04-17AE22762ND
2018-04-17AE22763ND
2018-07-17AE33589ND
2018-07-18AE337151.10 ppb
2018-07-18AE33731ND
2018-09-20AE4096613.0 ppb
2018-09-20AE4096513.2 ppb
2018-11-07AE457302.30 ppb
2018-11-07AE457312.50 ppb
2018-11-07AE457323.80 ppb
2018-11-07AE457332.40 ppb
2019-01-29AE52056ND
2019-01-29AE520571.30 ppb
2019-01-29AE520551.40 ppb
2019-01-29AE52058ND
2019-05-14AE661841.80 ppb
2019-05-14AE661811.80 ppb
2019-05-14AE661821.70 ppb
2019-05-14AE661801.40 ppb
2019-07-23AE75783ND
2019-07-23AE757361.80 ppb
2019-07-23AE757541.60 ppb
2019-07-23AE757511.40 ppb
2019-09-17AE835573.10 ppb
2019-10-22AE873631.60 ppb
2019-10-22AE874081.40 ppb
2019-10-22AE873921.60 ppb
2019-10-22AE873861.70 ppb