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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

City of Pasadena

Monochloroacetic 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)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND320ND
20151.29 ppb3210ND - 5.50 ppb
20160.503 ppb324ND - 5.50 ppb
2017ND320ND
20180.406 ppb325ND - 3.20 ppb
20193.05 ppb3218ND - 11.6 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 53 ppb

The EWG Health Guideline of 53 ppb for monochloroacetic 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.. This health guideline protects against system toxicity.

ppb = parts per billion

All test results

Date Lab ID Result
2014-03-06AC45969ND
2014-03-06AC45948ND
2014-03-06AC45945ND
2014-03-06AC45944ND
2014-03-06AC45947ND
2014-03-06AC45946ND
2014-03-06AC45949ND
2014-03-06AC45950ND
2014-04-24AC51693ND
2014-04-24AC51688ND
2014-04-24AC51686ND
2014-04-24AC51690ND
2014-04-24AC51714ND
2014-04-24AC51692ND
2014-04-24AC51691ND
2014-04-24AC51687ND
2014-08-21AC64987ND
2014-08-21AC65018ND
2014-08-21AC64990ND
2014-08-21AC64995ND
2014-08-21AC64999ND
2014-08-21AC64994ND
2014-08-21AC64988ND
2014-08-21AC64997ND
2014-11-25AC73047ND
2014-11-25AC73036ND
2014-11-25AC73059ND
2014-11-25AC73076ND
2014-11-25AC73060ND
2014-11-25AC73057ND
2014-11-25AC73062ND
2014-11-25AC73053ND
2015-01-14AC76180ND
2015-01-14AC76178ND
2015-01-14AC76199ND
2015-01-14AC76177ND
2015-01-14AC76198ND
2015-01-14AC761762.10 ppb
2015-01-14AC76188ND
2015-01-14AC76187ND
2015-05-27AC93738ND
2015-05-27AC937663.40 ppb
2015-05-27AC93765ND
2015-05-27AC937645.50 ppb
2015-05-27AC937334.10 ppb
2015-05-27AC93768ND
2015-05-27AC93740ND
2015-05-27AC93736ND
2015-07-22AD005935.10 ppb
2015-07-22AD005895.10 ppb
2015-07-22AD00584ND
2015-07-22AD005954.50 ppb
2015-07-22AD005862.50 ppb
2015-07-22AD005905.00 ppb
2015-07-22AD00591ND
2015-07-22AD005943.90 ppb
2015-10-06AD09582ND
2015-10-06AD09587ND
2015-10-06AD09575ND
2015-10-06AD09588ND
2015-10-06AD09574ND
2015-10-06AD09584ND
2015-10-06AD09583ND
2015-10-06AD09576ND
2016-01-11AD17287ND
2016-01-11AD17289ND
2016-01-11AD17281ND
2016-01-11AD17284ND
2016-01-11AD17306ND
2016-01-11AD17302ND
2016-01-11AD17288ND
2016-01-11AD17280ND
2016-04-06AD320473.90 ppb
2016-04-06AD320463.60 ppb
2016-04-06AD32044ND
2016-04-06AD32017ND
2016-04-06AD32037ND
2016-04-06AD32034ND
2016-04-06AD320455.50 ppb
2016-04-06AD320363.10 ppb
2016-07-06AD43095ND
2016-07-06AD43133ND
2016-07-06AD43134ND
2016-07-06AD43099ND
2016-07-06AD43100ND
2016-07-06AD43125ND
2016-07-06AD43098ND
2016-07-06AD43096ND
2016-10-06AD52669ND
2016-10-06AD52664ND
2016-10-06AD52666ND
2016-10-06AD52670ND
2016-10-06AD52672ND
2016-10-06AD52663ND
2016-10-06AD52665ND
2016-10-06AD52668ND
2017-01-10AD63950ND
2017-01-10AD63946ND
2017-01-10AD63945ND
2017-01-10AD63949ND
2017-01-10AD63970ND
2017-01-10AD63948ND
2017-01-10AD63968ND
2017-01-10AD63953ND
2017-04-04AD78253ND
2017-04-04AD78259ND
2017-04-04AD78260ND
2017-04-04AD78261ND
2017-04-04AD78254ND
2017-04-04AD78257ND
2017-04-04AD78256ND
2017-04-04AD78258ND
2017-07-11AD88880ND
2017-07-11AD88879ND
2017-07-11AD88878ND
2017-07-11AD88876ND
2017-07-11AD88847ND
2017-07-11AD88862ND
2017-07-11AD88844ND
2017-07-11AD88881ND
2017-10-31AE02882ND
2017-10-31AE02884ND
2017-10-31AE02877ND
2017-10-31AE02878ND
2017-10-31AE02876ND
2017-10-31AE02880ND
2017-10-31AE02881ND
2017-10-31AE02883ND
2018-02-06AE12457ND
2018-02-06AE12459ND
2018-02-06AE12460ND
2018-02-06AE12453ND
2018-02-06AE12458ND
2018-02-06AE12452ND
2018-02-06AE12450ND
2018-02-06AE12451ND
2018-05-02AE24808ND
2018-05-02AE24797ND
2018-05-02AE24802ND
2018-05-02AE24795ND
2018-05-02AE24807ND
2018-05-02AE24804ND
2018-05-02AE24803ND
2018-05-02AE24796ND
2018-07-30AE34864ND
2018-07-30AE34874ND
2018-07-30AE34875ND
2018-07-30AE34870ND
2018-07-30AE34876ND
2018-07-30AE34865ND
2018-07-30AE34867ND
2018-07-30AE34871ND
2018-11-14AE460572.50 ppb
2018-11-14AE46041ND
2018-11-14AE460733.20 ppb
2018-11-14AE46056ND
2018-11-14AE460722.70 ppb
2018-11-14AE460712.50 ppb
2018-11-14AE46074ND
2018-11-14AE460702.10 ppb
2019-01-30AE52180ND
2019-01-30AE521782.60 ppb
2019-01-30AE521855.40 ppb
2019-01-30AE521842.70 ppb
2019-01-30AE52192ND
2019-01-30AE521822.80 ppb
2019-01-30AE521833.00 ppb
2019-01-30AE521813.00 ppb
2019-04-23AE63337ND
2019-04-23AE633675.50 ppb
2019-04-23AE633644.40 ppb
2019-04-23AE63340ND
2019-04-23AE63339ND
2019-04-23AE63338ND
2019-04-23AE63336ND
2019-04-23AE6336511.3 ppb
2019-08-06AE77180ND
2019-08-06AE77177ND
2019-08-06AE77179ND
2019-08-06AE771762.70 ppb
2019-08-06AE771844.90 ppb
2019-08-06AE77178ND
2019-08-06AE771833.70 ppb
2019-08-06AE771815.60 ppb
2019-10-21AE8704511.6 ppb
2019-10-21AE870449.70 ppb
2019-10-21AE87041ND
2019-10-21AE870475.50 ppb
2019-10-21AE870466.30 ppb
2019-10-21AE870486.90 ppb
2019-10-21AE87043ND
2019-10-21AE87042ND