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EWG's Tap Water Database — 2021 UPDATE

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Dichloroacetic acid

City of Alamo

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.

MORE ABOUT THIS CONTAMINANT

 

96

Samples

0

Samples exceeding legal limit (MCL)

47

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.775 ppb167ND - 2.80 ppb
20150.394 ppb166ND - 1.10 ppb
20160.313 ppb164ND - 1.50 ppb
20172.71 ppb167ND - 26.8 ppb
20181.24 ppb1611ND - 2.60 ppb
20191.86 ppb1612ND - 3.30 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
2014-02-28AC453222.10 ppb
2014-02-28AC452962.00 ppb
2014-02-28AC452642.80 ppb
2014-02-28AC452602.50 ppb
2014-04-22AC51359ND
2014-04-22AC51356ND
2014-04-22AC51360ND
2014-04-22AC51361ND
2014-07-23AC60754ND
2014-07-23AC607581.000 ppb
2014-07-23AC607571.000 ppb
2014-07-23AC607551.000 ppb
2014-10-21AC70157ND
2014-10-21AC70170ND
2014-10-21AC70156ND
2014-10-21AC70171ND
2015-01-21AC77199ND
2015-01-21AC771981.10 ppb
2015-01-21AC772001.10 ppb
2015-01-21AC771961.000 ppb
2015-04-07AC87462ND
2015-04-07AC87457ND
2015-04-07AC87482ND
2015-04-07AC87451ND
2015-07-14AC99327ND
2015-07-14AC99334ND
2015-07-14AC99333ND
2015-07-14AC99330ND
2015-10-20AD111661.000 ppb
2015-10-20AD111561.000 ppb
2015-10-20AD111581.10 ppb
2015-10-20AD11161ND
2016-03-02AD26625ND
2016-03-02AD26623ND
2016-03-02AD26618ND
2016-03-02AD26619ND
2016-06-08AD39708ND
2016-06-08AD39714ND
2016-06-08AD397491.000 ppb
2016-06-08AD39748ND
2016-07-14AD44222ND
2016-07-14AD44217ND
2016-07-14AD44218ND
2016-07-14AD44231ND
2016-11-15AD57982ND
2016-11-15AD580031.30 ppb
2016-11-15AD580081.50 ppb
2016-11-15AD580061.20 ppb
2017-01-10AD639383.30 ppb
2017-01-10AD639243.30 ppb
2017-01-10AD639253.50 ppb
2017-01-10AD639263.50 ppb
2017-05-01AD817791.60 ppb
2017-05-01AD81756ND
2017-05-01AD817761.40 ppb
2017-05-01AD81755ND
2017-07-12AD89052ND
2017-07-12AD89050ND
2017-07-12AD89056ND
2017-07-12AD89053ND
2017-10-31AE02918ND
2017-10-31AE02915ND
2017-10-31AE02919ND
2017-10-31AE0289926.8 ppb
2018-01-24AE101512.30 ppb
2018-01-24AE101432.60 ppb
2018-01-24AE101482.20 ppb
2018-01-24AE101492.60 ppb
2018-04-11AE220461.60 ppb
2018-04-11AE220451.40 ppb
2018-04-11AE220391.80 ppb
2018-04-11AE220371.40 ppb
2018-08-16AE37334ND
2018-08-16AE373251.20 ppb
2018-08-16AE373281.40 ppb
2018-08-16AE373261.30 ppb
2018-10-10AE43054ND
2018-10-10AE43077ND
2018-10-10AE43078ND
2018-10-10AE43061ND
2019-02-26AE559412.30 ppb
2019-02-26AE559452.00 ppb
2019-02-26AE559431.80 ppb
2019-02-26AE559492.00 ppb
2019-05-21AE67347ND
2019-05-21AE67339ND
2019-05-21AE67336ND
2019-05-21AE67340ND
2019-09-04AE820132.60 ppb
2019-09-04AE820203.30 ppb
2019-09-04AE820113.00 ppb
2019-09-04AE820182.60 ppb
2019-11-07AE888682.40 ppb
2019-11-07AE888733.10 ppb
2019-11-07AE888751.50 ppb
2019-11-07AE888703.20 ppb