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EWG's Tap Water Database — 2019 UPDATE

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Trichloroacetic acid

City of Houston

Trichloroacetic 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.

 

390

Samples

0

Samples exceeding legal limit (MCL)

371

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20124.78 ppb7165ND - 15.6 ppb
20133.49 ppb6460ND - 8.40 ppb
20145.73 ppb6463ND - 13.0 ppb
20157.41 ppb6361ND - 21.5 ppb
20166.04 ppb6461ND - 16.9 ppb
20174.70 ppb6461ND - 8.30 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.5 ppb

The EWG Health Guideline of 0.5 ppb for trichloroacetic acid was defined by the Environmental Protection Agency 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
2012-01-31AB79762ND
2012-01-31AB7976414.8 ppb
2012-01-31AB7976113.3 ppb
2012-01-31AB7975815.6 ppb
2012-01-31AB7976313.9 ppb
2012-01-31AB7976613.4 ppb
2012-01-31AB7975611.0 ppb
2012-01-31AB7975914.3 ppb
2012-01-31AB797601.30 ppb
2012-01-31AB7975711.8 ppb
2012-01-31AB7975512.1 ppb
2012-01-31AB797652.00 ppb
2012-02-01AB79776ND
2012-02-01AB797702.60 ppb
2012-02-01AB797722.10 ppb
2012-02-01AB797672.60 ppb
2012-02-01AB797693.50 ppb
2012-02-01AB7977111.3 ppb
2012-02-01AB79784ND
2012-02-01AB797752.60 ppb
2012-02-01AB797834.30 ppb
2012-02-01AB797788.80 ppb
2012-02-01AB7977711.8 ppb
2012-06-11AB921734.00 ppb
2012-06-11AB921945.60 ppb
2012-06-11AB921866.80 ppb
2012-06-11AB921717.70 ppb
2012-06-11AB921975.00 ppb
2012-06-11AB921934.40 ppb
2012-06-11AB921985.50 ppb
2012-06-11AB921727.40 ppb
2012-06-11AB921704.80 ppb
2012-06-12AB923524.50 ppb
2012-06-12AB923474.60 ppb
2012-06-12AB923534.80 ppb
2012-06-12AB923435.40 ppb
2012-06-12AB92348ND
2012-06-12AB923517.10 ppb
2012-06-12AB923445.00 ppb
2012-09-19AC012792.50 ppb
2012-09-19AC01289ND
2012-09-19AC012845.30 ppb
2012-09-19AC012832.60 ppb
2012-09-19AC012824.30 ppb
2012-09-19AC012804.50 ppb
2012-09-19AC012762.90 ppb
2012-09-19AC012863.10 ppb
2012-09-19AC012772.60 ppb
2012-09-19AC012815.30 ppb
2012-09-19AC012852.50 ppb
2012-09-19AC012902.80 ppb
2012-09-20AC015452.80 ppb
2012-09-20AC015412.30 ppb
2012-09-20AC015421.10 ppb
2012-09-20AC015442.80 ppb
2012-11-07AC048932.40 ppb
2012-11-07AC048971.70 ppb
2012-11-07AC048943.40 ppb
2012-11-07AC048832.60 ppb
2012-11-07AC048912.00 ppb
2012-11-07AC048962.50 ppb
2012-11-07AC048871.60 ppb
2012-11-07AC048952.60 ppb
2012-11-07AC048982.40 ppb
2012-11-07AC048892.10 ppb
2012-11-08AC04890ND
2012-11-08AC048822.60 ppb
2012-11-08AC048842.70 ppb
2012-11-08AC048862.60 ppb
2012-11-08AC048852.50 ppb
2012-11-08AC048922.40 ppb
2013-02-25AC11563ND
2013-02-25AC115582.80 ppb
2013-02-25AC115492.60 ppb
2013-02-25AC115592.60 ppb
2013-02-25AC115532.60 ppb
2013-02-25AC115503.60 ppb
2013-02-25AC115542.30 ppb
2013-02-26AC117322.70 ppb
2013-02-26AC117332.60 ppb
2013-02-26AC117342.20 ppb
2013-02-26AC117352.20 ppb
2013-02-26AC117392.40 ppb
2013-02-26AC11730ND
2013-02-26AC117412.50 ppb
2013-02-26AC117382.60 ppb
2013-02-26AC117312.40 ppb
2013-06-12AC220582.80 ppb
2013-06-12AC220553.10 ppb
2013-06-12AC220572.70 ppb
2013-06-12AC220563.50 ppb
2013-06-12AC220673.50 ppb
2013-06-12AC220683.70 ppb
2013-06-12AC220543.30 ppb
2013-06-12AC220773.80 ppb
2013-06-13AC220766.60 ppb
2013-06-13AC220653.90 ppb
2013-06-13AC220692.50 ppb
2013-06-13AC220533.50 ppb
2013-06-13AC220641.50 ppb
2013-06-13AC220605.30 ppb
2013-06-13AC220954.20 ppb
2013-06-13AC220713.10 ppb
2013-09-24AC311602.30 ppb
2013-09-24AC311651.70 ppb
2013-09-24AC311612.70 ppb
2013-09-24AC311631.90 ppb
2013-09-24AC311673.20 ppb
2013-09-24AC311622.80 ppb
2013-09-24AC311642.30 ppb
2013-09-24AC31168ND
2013-09-24AC311703.30 ppb
2013-09-24AC311693.50 ppb
2013-09-24AC311663.00 ppb
2013-09-24AC311592.40 ppb
2013-09-24AC311723.10 ppb
2013-09-25AC313323.40 ppb
2013-09-25AC313222.60 ppb
2013-09-25AC313342.70 ppb
2013-12-16AC376352.50 ppb
2013-12-16AC376405.10 ppb
2013-12-16AC376395.70 ppb
2013-12-16AC376415.00 ppb
2013-12-16AC376385.30 ppb
2013-12-16AC376424.80 ppb
2013-12-17AC377988.40 ppb
2013-12-17AC378045.90 ppb
2013-12-17AC378056.80 ppb
2013-12-17AC378017.00 ppb
2013-12-17AC378036.90 ppb
2013-12-17AC37802ND
2013-12-17AC377977.90 ppb
2013-12-17AC377968.10 ppb
2013-12-17AC378085.90 ppb
2013-12-17AC378064.00 ppb
2014-03-05AC456679.80 ppb
2014-03-05AC456669.00 ppb
2014-03-05AC456496.50 ppb
2014-03-05AC456639.90 ppb
2014-03-05AC456507.70 ppb
2014-03-05AC456525.70 ppb
2014-03-05AC456878.50 ppb
2014-03-05AC456881.000 ppb
2014-03-05AC456628.00 ppb
2014-03-05AC4566513.0 ppb
2014-03-05AC456516.50 ppb
2014-03-05AC456699.30 ppb
2014-03-05AC456487.30 ppb
2014-03-06AC459657.70 ppb
2014-03-06AC459438.30 ppb
2014-03-06AC459688.80 ppb
2014-05-19AC545585.50 ppb
2014-05-19AC545596.40 ppb
2014-05-19AC545745.20 ppb
2014-05-19AC545605.10 ppb
2014-05-19AC545666.20 ppb
2014-05-19AC545525.50 ppb
2014-05-19AC545564.80 ppb
2014-05-19AC545636.30 ppb
2014-05-19AC545536.30 ppb
2014-05-19AC545686.50 ppb
2014-05-20AC547165.40 ppb
2014-05-20AC547484.70 ppb
2014-05-20AC547083.90 ppb
2014-05-20AC547194.50 ppb
2014-05-20AC547155.20 ppb
2014-05-20AC547131.90 ppb
2014-07-15AC597536.60 ppb
2014-07-15AC597575.60 ppb
2014-07-15AC597548.90 ppb
2014-07-15AC597557.20 ppb
2014-07-15AC597528.00 ppb
2014-07-15AC597498.00 ppb
2014-07-15AC597706.30 ppb
2014-07-15AC597696.70 ppb
2014-07-15AC597508.70 ppb
2014-07-15AC597518.20 ppb
2014-07-15AC597568.20 ppb
2014-07-16AC598794.80 ppb
2014-07-16AC598785.40 ppb
2014-07-16AC598924.80 ppb
2014-07-16AC59893ND
2014-07-16AC598975.80 ppb
2014-12-18AC754402.90 ppb
2014-12-18AC754533.20 ppb
2014-12-18AC754483.20 ppb
2014-12-18AC754462.90 ppb
2014-12-18AC754512.70 ppb
2014-12-18AC754472.70 ppb
2014-12-19AC756313.90 ppb
2014-12-19AC756282.70 ppb
2014-12-19AC756493.90 ppb
2014-12-19AC756372.70 ppb
2014-12-19AC756453.60 ppb
2014-12-19AC756293.00 ppb
2014-12-19AC756253.70 ppb
2014-12-19AC756264.00 ppb
2014-12-19AC756384.10 ppb
2014-12-19AC756333.60 ppb
2015-03-04AC826763.80 ppb
2015-03-04AC826793.90 ppb
2015-03-04AC827334.30 ppb
2015-03-04AC826693.70 ppb
2015-03-04AC826754.00 ppb
2015-03-04AC826714.00 ppb
2015-03-04AC827283.90 ppb
2015-03-04AC826673.80 ppb
2015-03-04AC826724.10 ppb
2015-03-04AC826684.20 ppb
2015-03-04AC826644.20 ppb
2015-03-04AC826733.80 ppb
2015-03-05AC827122.60 ppb
2015-03-05AC827082.80 ppb
2015-03-05AC827072.20 ppb
2015-03-05AC826885.00 ppb
2015-06-16AC9615113.2 ppb
2015-06-16AC9615412.3 ppb
2015-06-16AC9614514.5 ppb
2015-06-16AC9613910.9 ppb
2015-06-16AC9614212.0 ppb
2015-06-16AC9613712.9 ppb
2015-06-16AC9615512.5 ppb
2015-06-16AC9615014.0 ppb
2015-06-16AC9613813.0 ppb
2015-06-17AC9624317.6 ppb
2015-06-17AC9626019.9 ppb
2015-06-17AC9626221.5 ppb
2015-06-17AC9627419.5 ppb
2015-06-17AC9627319.8 ppb
2015-06-17AC9626517.4 ppb
2015-09-16AD072943.80 ppb
2015-09-16AD072976.20 ppb
2015-09-16AD072936.80 ppb
2015-09-16AD073125.30 ppb
2015-09-16AD073135.10 ppb
2015-09-16AD073046.50 ppb
2015-09-16AD073025.10 ppb
2015-09-16AD073113.80 ppb
2015-09-16AD072925.90 ppb
2015-09-16AD073296.40 ppb
2015-09-16AD073274.50 ppb
2015-09-17AD075374.00 ppb
2015-09-17AD075384.20 ppb
2015-09-17AD075634.10 ppb
2015-09-17AD07536ND
2015-09-17AD075465.10 ppb
2015-11-16AD135628.90 ppb
2015-11-16AD136189.30 ppb
2015-11-16AD135614.90 ppb
2015-11-16AD135597.30 ppb
2015-11-16AD136198.50 ppb
2015-11-16AD135588.60 ppb
2015-11-16AD135654.70 ppb
2015-11-16AD1355610.4 ppb
2015-11-16AD135578.10 ppb
2015-11-16AD135605.80 ppb
2015-11-17AD137684.40 ppb
2015-11-17AD137735.20 ppb
2015-11-17AD137674.60 ppb
2015-11-17AD137725.20 ppb
2015-11-17AD13771ND
2015-11-17AD137663.00 ppb
2016-03-16AD290186.40 ppb
2016-03-16AD290336.20 ppb
2016-03-16AD290308.50 ppb
2016-03-16AD290379.20 ppb
2016-03-16AD290196.60 ppb
2016-03-16AD290275.70 ppb
2016-03-16AD290298.50 ppb
2016-03-16AD290367.20 ppb
2016-03-16AD290325.00 ppb
2016-03-16AD290267.50 ppb
2016-03-17AD2931910.5 ppb
2016-03-17AD2932310.00 ppb
2016-03-17AD293228.40 ppb
2016-03-17AD2931810.7 ppb
2016-03-17AD29320ND
2016-03-17AD293219.40 ppb
2016-06-15AD4071812.9 ppb
2016-06-15AD407148.80 ppb
2016-06-15AD4072210.5 ppb
2016-06-15AD407259.20 ppb
2016-06-15AD4072612.4 ppb
2016-06-15AD407169.50 ppb
2016-06-15AD4071913.8 ppb
2016-06-15AD407108.40 ppb
2016-06-15AD4073013.9 ppb
2016-06-15AD407279.40 ppb
2016-06-15AD4072013.1 ppb
2016-06-15AD407179.50 ppb
2016-06-16AD409729.10 ppb
2016-06-16AD409717.90 ppb
2016-06-16AD40964ND
2016-06-16AD4096816.9 ppb
2016-09-20AD503244.60 ppb
2016-09-20AD503274.00 ppb
2016-09-20AD503303.70 ppb
2016-09-20AD503293.60 ppb
2016-09-20AD503253.50 ppb
2016-09-20AD503283.90 ppb
2016-09-20AD503263.30 ppb
2016-09-21AD507073.70 ppb
2016-09-21AD506866.30 ppb
2016-09-21AD506973.40 ppb
2016-09-21AD507083.70 ppb
2016-09-21AD507124.00 ppb
2016-09-21AD50710ND
2016-09-21AD506963.80 ppb
2016-09-21AD507063.60 ppb
2016-09-21AD506953.80 ppb
2016-11-17AD585432.60 ppb
2016-11-17AD585383.20 ppb
2016-11-17AD585394.30 ppb
2016-11-17AD585362.90 ppb
2016-11-17AD585442.30 ppb
2016-11-17AD585452.50 ppb
2016-11-18AD588252.60 ppb
2016-11-18AD588172.70 ppb
2016-11-18AD588202.50 ppb
2016-11-18AD588161.80 ppb
2016-11-18AD588182.50 ppb
2016-11-18AD588151.70 ppb
2016-11-18AD588192.30 ppb
2016-11-18AD588142.00 ppb
2016-11-21AD587743.30 ppb
2016-11-21AD587753.30 ppb
2017-02-28AD724225.10 ppb
2017-02-28AD724195.00 ppb
2017-02-28AD724243.60 ppb
2017-02-28AD723994.10 ppb
2017-02-28AD724214.60 ppb
2017-02-28AD724204.30 ppb
2017-02-28AD723984.00 ppb
2017-02-28AD724184.60 ppb
2017-02-28AD724235.70 ppb
2017-02-28AD723974.10 ppb
2017-03-01AD727393.60 ppb
2017-03-01AD727423.50 ppb
2017-03-01AD727453.60 ppb
2017-03-01AD727373.70 ppb
2017-03-01AD72740ND
2017-03-01AD727383.90 ppb
2017-04-26AD811424.50 ppb
2017-04-26AD811443.40 ppb
2017-04-26AD811394.00 ppb
2017-04-26AD811403.80 ppb
2017-04-26AD811364.80 ppb
2017-04-26AD811354.30 ppb
2017-04-26AD811434.50 ppb
2017-04-26AD811413.30 ppb
2017-04-26AD811453.40 ppb
2017-04-26AD811463.60 ppb
2017-04-26AD811374.40 ppb
2017-04-26AD811384.40 ppb
2017-04-27AD814794.30 ppb
2017-04-27AD814753.90 ppb
2017-04-27AD81478ND
2017-04-27AD814773.80 ppb
2017-07-25AD905305.30 ppb
2017-07-25AD905228.30 ppb
2017-07-25AD905257.50 ppb
2017-07-25AD905435.40 ppb
2017-07-25AD905455.50 ppb
2017-07-25AD905446.40 ppb
2017-07-25AD905236.20 ppb
2017-07-25AD905326.20 ppb
2017-07-25AD905246.80 ppb
2017-07-25AD905317.60 ppb
2017-07-25AD905214.60 ppb
2017-07-26AD907995.50 ppb
2017-07-26AD908044.40 ppb
2017-07-26AD907965.70 ppb
2017-07-26AD907972.30 ppb
2017-07-26AD908024.90 ppb
2017-11-15AE049365.70 ppb
2017-11-15AE049336.30 ppb
2017-11-15AE049256.60 ppb
2017-11-15AE049306.10 ppb
2017-11-15AE049313.70 ppb
2017-11-15AE049246.30 ppb
2017-11-15AE049265.60 ppb
2017-11-15AE04927ND
2017-11-15AE049295.30 ppb
2017-11-15AE049356.80 ppb
2017-11-15AE049285.80 ppb
2017-11-15AE049347.80 ppb
2017-11-15AE049325.30 ppb
2017-11-16AE051804.40 ppb
2017-11-16AE051814.30 ppb
2017-11-16AE051824.40 ppb