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EWG's Tap Water Database — 2019 UPDATE

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Dichloroacetic acid

City of South Houston

Dichloroacetic acid, one of the group of five haloacetic acids regulated by federal standards, is formed when chlorine or other disinfectants are used to treat drinking water. Haloacetic acids and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.

 

93

Samples

0

Samples exceeding legal limit (MCL)

85

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20129.45 ppb1310ND - 37.1 ppb
201312.6 ppb16169.70 ppb - 16.2 ppb
201411.0 ppb1611ND - 24.8 ppb
201519.3 ppb161610.6 ppb - 42.9 ppb
201620.2 ppb16163.40 ppb - 33.2 ppb
201711.9 ppb16163.40 ppb - 24.0 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.2 ppb

The EWG Health Guideline of 0.2 ppb for dichloroacetic acid was proposed in 2020 by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk.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
2012-02-06AB8023837.1 ppb
2012-05-18AB90295ND
2012-05-18AB902995.60 ppb
2012-05-18AB9030921.0 ppb
2012-05-18AB9029611.5 ppb
2012-07-06AB94704ND
2012-07-06AB94705ND
2012-07-06AB946872.00 ppb
2012-07-06AB946882.10 ppb
2012-10-12AC0323713.1 ppb
2012-10-12AC0322514.4 ppb
2012-10-12AC0322614.2 ppb
2012-10-12AC032381.80 ppb
2013-01-14AC0759411.0 ppb
2013-01-14AC0759511.0 ppb
2013-01-14AC0760111.4 ppb
2013-01-14AC0760012.2 ppb
2013-04-02AC1550711.9 ppb
2013-04-02AC1549712.8 ppb
2013-04-02AC1550015.0 ppb
2013-04-02AC1550314.8 ppb
2013-07-19AC2537510.3 ppb
2013-07-19AC2537012.1 ppb
2013-07-19AC2537614.4 ppb
2013-07-19AC2533916.2 ppb
2013-10-24AC3326014.4 ppb
2013-10-24AC3325310.3 ppb
2013-10-24AC3323914.0 ppb
2013-10-24AC332389.70 ppb
2014-02-14AC430237.40 ppb
2014-02-14AC4307019.3 ppb
2014-02-14AC4306817.0 ppb
2014-02-14AC4309119.8 ppb
2014-04-07AC4961222.3 ppb
2014-04-07AC4961524.8 ppb
2014-04-07AC4958217.2 ppb
2014-06-06AC5629815.1 ppb
2014-08-11AC62901ND
2014-08-11AC6292922.3 ppb
2014-08-11AC62900ND
2014-08-11AC62902ND
2014-11-24AC727871.20 ppb
2014-11-24AC72782ND
2014-11-24AC727208.90 ppb
2014-11-24AC72786ND
2015-01-21AC7720319.4 ppb
2015-01-21AC7720919.3 ppb
2015-01-21AC7720419.0 ppb
2015-01-21AC7720218.8 ppb
2015-06-12AC9590714.6 ppb
2015-06-12AC9592725.0 ppb
2015-06-12AC9590013.5 ppb
2015-06-12AC9589942.9 ppb
2015-07-20AD0012132.8 ppb
2015-07-20AD0007716.5 ppb
2015-07-20AD0010516.8 ppb
2015-07-20AD0010016.8 ppb
2015-10-06AD0959016.2 ppb
2015-10-06AD0958512.7 ppb
2015-10-06AD0959213.7 ppb
2015-10-06AD0958110.6 ppb
2016-01-14AD1816222.0 ppb
2016-01-14AD1816422.0 ppb
2016-01-14AD1816327.8 ppb
2016-01-14AD1816522.1 ppb
2016-04-08AD3254129.5 ppb
2016-04-08AD3254633.2 ppb
2016-04-08AD3252819.2 ppb
2016-04-08AD3253522.4 ppb
2016-07-11AD4355526.5 ppb
2016-07-11AD4351610.8 ppb
2016-07-11AD4352221.4 ppb
2016-07-11AD4351525.9 ppb
2016-10-07AD5279411.2 ppb
2016-10-07AD527963.40 ppb
2016-10-07AD5279511.1 ppb
2016-10-07AD5279814.2 ppb
2017-01-06AD635613.40 ppb
2017-01-06AD635628.60 ppb
2017-01-06AD635635.40 ppb
2017-01-06AD635608.60 ppb
2017-04-07AD7891124.0 ppb
2017-04-07AD7891316.9 ppb
2017-04-07AD7891219.3 ppb
2017-04-07AD789109.50 ppb
2017-07-14AD894147.20 ppb
2017-07-14AD894194.90 ppb
2017-07-14AD8941517.1 ppb
2017-07-14AD8941717.0 ppb
2017-10-17AE0107116.9 ppb
2017-10-17AE010606.50 ppb
2017-10-17AE010569.20 ppb
2017-10-17AE0105916.3 ppb