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EWG's Tap Water Database — 2021 UPDATE

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Trichloroacetic acid

City of Pasadena

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.

MORE ABOUT THIS CONTAMINANT

 

192

Samples

0

Samples exceeding legal limit (MCL)

171

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20144.80 ppb3227ND - 10.4 ppb
20156.43 ppb3226ND - 17.3 ppb
20165.25 ppb3230ND - 9.90 ppb
20174.53 ppb3225ND - 8.50 ppb
20187.08 ppb32322.40 ppb - 13.7 ppb
20195.84 ppb3231ND - 14.0 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for trichloroacetic 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
2014-03-06AC459695.90 ppb
2014-03-06AC459487.90 ppb
2014-03-06AC459459.70 ppb
2014-03-06AC459447.40 ppb
2014-03-06AC4594710.1 ppb
2014-03-06AC4594610.1 ppb
2014-03-06AC4594910.4 ppb
2014-03-06AC459507.20 ppb
2014-04-24AC516934.10 ppb
2014-04-24AC516884.70 ppb
2014-04-24AC516864.00 ppb
2014-04-24AC516905.00 ppb
2014-04-24AC51714ND
2014-04-24AC516925.10 ppb
2014-04-24AC516914.90 ppb
2014-04-24AC516874.80 ppb
2014-08-21AC64987ND
2014-08-21AC650185.20 ppb
2014-08-21AC649903.90 ppb
2014-08-21AC649955.40 ppb
2014-08-21AC649995.80 ppb
2014-08-21AC649944.60 ppb
2014-08-21AC64988ND
2014-08-21AC649974.90 ppb
2014-11-25AC73047ND
2014-11-25AC730369.90 ppb
2014-11-25AC730592.00 ppb
2014-11-25AC730763.20 ppb
2014-11-25AC730603.00 ppb
2014-11-25AC730572.50 ppb
2014-11-25AC73062ND
2014-11-25AC730531.80 ppb
2015-01-14AC76180ND
2015-01-14AC761785.20 ppb
2015-01-14AC76199ND
2015-01-14AC761774.70 ppb
2015-01-14AC761985.20 ppb
2015-01-14AC761765.10 ppb
2015-01-14AC76188ND
2015-01-14AC761874.90 ppb
2015-05-27AC93738ND
2015-05-27AC9376616.6 ppb
2015-05-27AC9376511.8 ppb
2015-05-27AC9376413.6 ppb
2015-05-27AC9373313.2 ppb
2015-05-27AC9376817.3 ppb
2015-05-27AC93740ND
2015-05-27AC937366.10 ppb
2015-07-22AD005939.40 ppb
2015-07-22AD0058910.00 ppb
2015-07-22AD005841.40 ppb
2015-07-22AD005959.50 ppb
2015-07-22AD0058610.2 ppb
2015-07-22AD005909.60 ppb
2015-07-22AD00591ND
2015-07-22AD005949.50 ppb
2015-10-06AD095825.70 ppb
2015-10-06AD095875.00 ppb
2015-10-06AD095756.00 ppb
2015-10-06AD095885.10 ppb
2015-10-06AD095743.40 ppb
2015-10-06AD095845.70 ppb
2015-10-06AD095836.00 ppb
2015-10-06AD095765.70 ppb
2016-01-11AD172874.40 ppb
2016-01-11AD172898.00 ppb
2016-01-11AD172813.80 ppb
2016-01-11AD172846.50 ppb
2016-01-11AD173064.90 ppb
2016-01-11AD17302ND
2016-01-11AD172884.90 ppb
2016-01-11AD172806.00 ppb
2016-04-06AD320476.20 ppb
2016-04-06AD320466.30 ppb
2016-04-06AD320445.50 ppb
2016-04-06AD320177.20 ppb
2016-04-06AD320375.30 ppb
2016-04-06AD320342.10 ppb
2016-04-06AD320455.80 ppb
2016-04-06AD320365.70 ppb
2016-07-06AD430959.90 ppb
2016-07-06AD431339.70 ppb
2016-07-06AD431349.60 ppb
2016-07-06AD430998.60 ppb
2016-07-06AD43100ND
2016-07-06AD431252.80 ppb
2016-07-06AD430988.80 ppb
2016-07-06AD430967.90 ppb
2016-10-06AD526693.00 ppb
2016-10-06AD526643.30 ppb
2016-10-06AD526662.50 ppb
2016-10-06AD526703.70 ppb
2016-10-06AD526725.40 ppb
2016-10-06AD526633.70 ppb
2016-10-06AD526653.70 ppb
2016-10-06AD526682.80 ppb
2017-01-10AD639504.00 ppb
2017-01-10AD639463.80 ppb
2017-01-10AD639453.90 ppb
2017-01-10AD639494.20 ppb
2017-01-10AD639705.20 ppb
2017-01-10AD639483.80 ppb
2017-01-10AD639683.70 ppb
2017-01-10AD639534.00 ppb
2017-04-04AD782536.00 ppb
2017-04-04AD782596.80 ppb
2017-04-04AD782606.80 ppb
2017-04-04AD782617.00 ppb
2017-04-04AD782546.70 ppb
2017-04-04AD782576.90 ppb
2017-04-04AD782567.30 ppb
2017-04-04AD782588.00 ppb
2017-07-11AD888806.60 ppb
2017-07-11AD888796.70 ppb
2017-07-11AD888785.00 ppb
2017-07-11AD888766.40 ppb
2017-07-11AD888473.40 ppb
2017-07-11AD88862ND
2017-07-11AD888445.80 ppb
2017-07-11AD888816.10 ppb
2017-10-31AE02882ND
2017-10-31AE02884ND
2017-10-31AE028778.50 ppb
2017-10-31AE02878ND
2017-10-31AE028768.20 ppb
2017-10-31AE02880ND
2017-10-31AE02881ND
2017-10-31AE02883ND
2018-02-06AE124576.40 ppb
2018-02-06AE124597.30 ppb
2018-02-06AE124606.80 ppb
2018-02-06AE124538.30 ppb
2018-02-06AE124586.80 ppb
2018-02-06AE124528.00 ppb
2018-02-06AE124506.40 ppb
2018-02-06AE124512.40 ppb
2018-05-02AE248088.60 ppb
2018-05-02AE247977.90 ppb
2018-05-02AE248028.40 ppb
2018-05-02AE247957.60 ppb
2018-05-02AE2480713.7 ppb
2018-05-02AE248047.90 ppb
2018-05-02AE248038.30 ppb
2018-05-02AE247968.00 ppb
2018-07-30AE348644.60 ppb
2018-07-30AE348745.20 ppb
2018-07-30AE348754.30 ppb
2018-07-30AE348705.10 ppb
2018-07-30AE348767.80 ppb
2018-07-30AE348655.30 ppb
2018-07-30AE348675.10 ppb
2018-07-30AE348714.70 ppb
2018-11-14AE460578.40 ppb
2018-11-14AE460416.30 ppb
2018-11-14AE460737.80 ppb
2018-11-14AE460568.90 ppb
2018-11-14AE460728.00 ppb
2018-11-14AE460717.90 ppb
2018-11-14AE460747.30 ppb
2018-11-14AE460707.00 ppb
2019-01-30AE521804.40 ppb
2019-01-30AE521786.50 ppb
2019-01-30AE521858.80 ppb
2019-01-30AE521845.70 ppb
2019-01-30AE521924.90 ppb
2019-01-30AE521825.70 ppb
2019-01-30AE521835.70 ppb
2019-01-30AE521816.10 ppb
2019-04-23AE633376.90 ppb
2019-04-23AE633676.30 ppb
2019-04-23AE633645.30 ppb
2019-04-23AE633407.10 ppb
2019-04-23AE633396.40 ppb
2019-04-23AE633385.10 ppb
2019-04-23AE633368.10 ppb
2019-04-23AE633658.30 ppb
2019-08-06AE77180ND
2019-08-06AE771775.20 ppb
2019-08-06AE771795.20 ppb
2019-08-06AE771763.80 ppb
2019-08-06AE771846.50 ppb
2019-08-06AE771781.90 ppb
2019-08-06AE771837.60 ppb
2019-08-06AE771817.40 ppb
2019-10-21AE870456.00 ppb
2019-10-21AE870446.80 ppb
2019-10-21AE8704114.0 ppb
2019-10-21AE870475.90 ppb
2019-10-21AE870465.90 ppb
2019-10-21AE870485.70 ppb
2019-10-21AE870431.60 ppb
2019-10-21AE870422.20 ppb