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EWG's Tap Water Database — 2021 UPDATE

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Dichloroacetic acid

Dale City

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

 

176

Samples

0

Samples exceeding legal limit (MCL)

172

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20147.06 ppb32321.50 ppb - 23.4 ppb
20156.14 ppb1615ND - 9.20 ppb
20165.92 ppb3231ND - 19.4 ppb
20179.00 ppb3231ND - 35.4 ppb
201815.0 ppb32321.10 ppb - 48.8 ppb
20197.51 ppb3231ND - 28.1 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
2014-02-1124695601HAA4.10 ppb
2014-02-1124695801HAA4.10 ppb
2014-02-1124695501HAA4.00 ppb
2014-02-1124695301HAA3.80 ppb
2014-02-1124695201HAA3.60 ppb
2014-02-1124695401HAA3.30 ppb
2014-02-1124695101HAA3.30 ppb
2014-02-1124695701HAA3.10 ppb
2014-05-1325610901HAA23.4 ppb
2014-05-1325610801HAA14.4 ppb
2014-05-1325611501HAA13.9 ppb
2014-05-1325611301HAA13.3 ppb
2014-05-1325611001HAA12.9 ppb
2014-05-1325611101HAA11.3 ppb
2014-05-1325611201HAA8.30 ppb
2014-05-2225611401HAA12.0 ppb
2014-08-1226554101HAA9.90 ppb
2014-08-1226554001HAA8.30 ppb
2014-08-1226554701HAA7.60 ppb
2014-08-1226554201HAA7.00 ppb
2014-08-1226554801HAA6.50 ppb
2014-08-1226554501HAA6.10 ppb
2014-08-1226554401HAA5.20 ppb
2014-08-1226554301HAA4.90 ppb
2014-11-1127473301HAA5.20 ppb
2014-11-1127472501HAA4.90 ppb
2014-11-1127473001HAA4.50 ppb
2014-11-1127473201HAA4.50 ppb
2014-11-1127472701HAA4.00 ppb
2014-11-1127472801HAA3.80 ppb
2014-11-1127472901HAA3.30 ppb
2014-11-1127472601HAA1.50 ppb
2015-08-1200009-AMERICAN W9.20 ppb
2015-08-1200009-AMERICAN W8.80 ppb
2015-08-1200009-AMERICAN W8.70 ppb
2015-08-1200009-AMERICAN W8.50 ppb
2015-08-1200009-AMERICAN W7.80 ppb
2015-08-1200009-AMERICAN W6.20 ppb
2015-08-1200009-AMERICAN W6.00 ppb
2015-08-1200009-AMERICAN W5.20 ppb
2015-11-1100009-AMERICAN W7.10 ppb
2015-11-1100009-AMERICAN W7.00 ppb
2015-11-1100009-AMERICAN W6.60 ppb
2015-11-1100009-AMERICAN W6.00 ppb
2015-11-1100009-AMERICAN W4.70 ppb
2015-11-1100009-AMERICAN W4.60 ppb
2015-11-1100009-AMERICAN W1.80 ppb
2015-11-1100009-AMERICAN WND
2016-02-1031205301HAA4.60 ppb
2016-02-1031204701HAA4.20 ppb
2016-02-1031204901HAA3.90 ppb
2016-02-1031205401HAA3.90 ppb
2016-02-1031205201HAA3.50 ppb
2016-02-1031204801HAA3.20 ppb
2016-02-1031205001HAA3.10 ppb
2016-02-10311205101HAA3.10 ppb
2016-05-0832000601HAA19.4 ppb
2016-05-0832000501HAA13.8 ppb
2016-05-0832001101HAA13.7 ppb
2016-05-0832000701HAA9.70 ppb
2016-05-0832001201HAA9.10 ppb
2016-05-0832001001HAA8.20 ppb
2016-05-0832000801HAA6.60 ppb
2016-05-0832000901HAA6.30 ppb
2016-08-13330381017.70 ppb
2016-08-13330382016.90 ppb
2016-08-13330386016.80 ppb
2016-08-13330380016.70 ppb
2016-08-13330387016.60 ppb
2016-08-13330385016.50 ppb
2016-08-13330384015.60 ppb
2016-08-13330383015.30 ppb
2016-11-15337106013.90 ppb
2016-11-15337103013.90 ppb
2016-11-15337108013.90 ppb
2016-11-15337105013.70 ppb
2016-11-15337104013.30 ppb
2016-11-15337101011.20 ppb
2016-11-15337107011.20 ppb
2016-11-1533710201ND
2017-02-14346253015.20 ppb
2017-02-14346254015.10 ppb
2017-02-14346259014.70 ppb
2017-02-14346258014.60 ppb
2017-02-14346255014.60 ppb
2017-02-14346257014.40 ppb
2017-02-14346260014.30 ppb
2017-02-14346256014.00 ppb
2017-05-103540750135.4 ppb
2017-05-103540850123.1 ppb
2017-05-103540730122.2 ppb
2017-05-103540770119.3 ppb
2017-05-103540870116.2 ppb
2017-05-103540830116.1 ppb
2017-05-103540790111.8 ppb
2017-05-103540810111.7 ppb
2017-08-153659570110.5 ppb
2017-08-15365959019.90 ppb
2017-08-15365958019.80 ppb
2017-08-15365961019.70 ppb
2017-08-15365956018.30 ppb
2017-08-15365960017.00 ppb
2017-08-15365955016.20 ppb
2017-08-15365954012.70 ppb
2017-11-14376175015.80 ppb
2017-11-14376174014.90 ppb
2017-11-14376179014.80 ppb
2017-11-14376177014.60 ppb
2017-11-14376176014.50 ppb
2017-11-14376178013.30 ppb
2017-11-14376172013.20 ppb
2017-11-1437617301ND
2018-02-13385892014.90 ppb
2018-02-13385893014.60 ppb
2018-02-13385894014.80 ppb
2018-02-13385895015.20 ppb
2018-02-13385896014.70 ppb
2018-02-13385897015.20 ppb
2018-02-13385898015.70 ppb
2018-02-13385899014.40 ppb
2018-05-153929820126.3 ppb
2018-05-153929830147.4 ppb
2018-05-153929840141.5 ppb
2018-05-153929850128.4 ppb
2018-05-153929860136.8 ppb
2018-05-153929870148.3 ppb
2018-05-153929880145.5 ppb
2018-05-153929890148.8 ppb
2018-08-14405845013.10 ppb
2018-08-14405846013.50 ppb
2018-08-144058470112.3 ppb
2018-08-144058480114.3 ppb
2018-08-144058490112.3 ppb
2018-08-144058500113.7 ppb
2018-08-14405851017.50 ppb
2018-08-144058520113.2 ppb
2018-11-13419395011.90 ppb
2018-11-13419396011.10 ppb
2018-11-13419397011.10 ppb
2018-11-13419398018.20 ppb
2018-11-13419399017.60 ppb
2018-11-13419400018.00 ppb
2018-11-13419401012.30 ppb
2018-11-13419402017.90 ppb
2019-02-12429402012.40 ppb
2019-02-12429403012.20 ppb
2019-02-12429404012.50 ppb
2019-02-12429405012.10 ppb
2019-02-12429406012.60 ppb
2019-02-12429407012.30 ppb
2019-02-12429408012.20 ppb
2019-02-12429409012.10 ppb
2019-05-144390620128.1 ppb
2019-05-144390630118.7 ppb
2019-05-144390640119.5 ppb
2019-05-144390650116.5 ppb
2019-05-144390660117.1 ppb
2019-05-144390670122.0 ppb
2019-05-144390680119.7 ppb
2019-05-144390690113.0 ppb
2019-08-12455600012.30 ppb
2019-08-12455601017.30 ppb
2019-08-12455602018.50 ppb
2019-08-12455603017.00 ppb
2019-08-12455604017.30 ppb
2019-08-12455605011.90 ppb
2019-08-12455606012.40 ppb
2019-08-12455607016.10 ppb
2019-11-1147051801ND
2019-11-11470519014.20 ppb
2019-11-11470520014.70 ppb
2019-11-11470521013.30 ppb
2019-11-11470522014.10 ppb
2019-11-11470523011.20 ppb
2019-11-11470524013.60 ppb
2019-11-11470525013.50 ppb