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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Regional Water Authority

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

 

240

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.77 ppb4845ND - 3.50 ppb
2015N/A00N/A
20163.59 ppb4843ND - 10.4 ppb
20174.33 ppb4847ND - 8.80 ppb
20182.86 ppb48480.900 ppb - 5.90 ppb
20191.54 ppb4847ND - 3.30 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
2014-03-04DBP 2003919541.50 ppb
2014-03-04DBP 2003919591.60 ppb
2014-03-04DBP 2003919741.60 ppb
2014-03-05DBP 2003920921.50 ppb
2014-03-05DBP 2003920931.40 ppb
2014-03-05DBP 200392094ND
2014-03-06DBP 200392152ND
2014-03-06DBP 2003922011.50 ppb
2014-03-06DBP 2003922021.000 ppb
2014-03-07DBP 2003923060.800 ppb
2014-03-07DBP 2003923071.30 ppb
2014-03-07DBP 2003923081.70 ppb
2014-06-02DBP 2003969482.90 ppb
2014-06-02DBP 2003969492.90 ppb
2014-06-02DBP 2003969501.50 ppb
2014-06-03DBP 2003969592.20 ppb
2014-06-03DBP 2003969642.00 ppb
2014-06-03DBP 2003969822.60 ppb
2014-06-03DBP 2003970732.10 ppb
2014-06-05DBP 2003972291.30 ppb
2014-06-05DBP 2003973272.40 ppb
2014-06-05DBP 2003973283.50 ppb
2014-06-06DBP 2003973543.10 ppb
2014-06-06DBP 2003973552.80 ppb
2014-09-02DBP 2004032721.80 ppb
2014-09-02DBP 2004032772.20 ppb
2014-09-02DBP 2004033021.90 ppb
2014-09-03DBP 2004034702.70 ppb
2014-09-03DBP 2004034712.20 ppb
2014-09-03DBP 2004034722.00 ppb
2014-09-04DBP 2004035171.90 ppb
2014-09-04DBP 2004035562.20 ppb
2014-09-04DBP 2004035572.10 ppb
2014-09-04DBP 2004035582.50 ppb
2014-09-06DBP 2004036871.000 ppb
2014-09-06DBP 2004036882.20 ppb
2014-12-02DBP 2004086830.900 ppb
2014-12-02DBP 2004086881.10 ppb
2014-12-02DBP 2004087061.70 ppb
2014-12-02DBP 2004087481.80 ppb
2014-12-02DBP 2004087492.20 ppb
2014-12-02DBP 2004087500.700 ppb
2014-12-03DBP 200408856ND
2014-12-03DBP 2004088572.80 ppb
2014-12-04DBP 2004089460.700 ppb
2014-12-04DBP 2004089681.80 ppb
2014-12-04DBP 2004089692.20 ppb
2014-12-04DBP 2004089701.20 ppb
2016-03-01DBP 2004344200.800 ppb
2016-03-01DBP 2004344320.800 ppb
2016-03-01DBP 2004344390.900 ppb
2016-03-01DBP 2004345181.20 ppb
2016-03-02DBP 2004346521.20 ppb
2016-03-02DBP 2004346531.70 ppb
2016-03-03DBP 200434705ND
2016-03-03DBP 200434734ND
2016-03-03DBP 2004347901.10 ppb
2016-03-03DBP 2004347910.900 ppb
2016-03-04DBP 2004348192.00 ppb
2016-03-04DBP 2004348202.00 ppb
2016-06-01DBP 2004410251.50 ppb
2016-06-01DBP 2004410262.30 ppb
2016-06-01DBP 2004410372.10 ppb
2016-06-01DBP 2004410543.20 ppb
2016-06-01DBP 2004410552.90 ppb
2016-06-01DBP 2004410561.40 ppb
2016-06-01DBP 2004410570.800 ppb
2016-06-01DBP 2004410582.00 ppb
2016-06-02DBP 2004412620.900 ppb
2016-06-02DBP 2004412972.80 ppb
2016-06-02DBP 2004412982.70 ppb
2016-06-02DBP 2004412991.80 ppb
2016-09-06DBP 2004489695.30 ppb
2016-09-06DBP 2004489745.00 ppb
2016-09-06DBP 2004490016.40 ppb
2016-09-06DBP 2004490143.70 ppb
2016-09-06DBP 2004490156.40 ppb
2016-09-06DBP 2004490167.00 ppb
2016-09-07DBP 2004492144.60 ppb
2016-09-08DBP 2004494076.10 ppb
2016-09-08DBP 2004494086.60 ppb
2016-09-09DBP 2004495006.10 ppb
2016-09-12DBP 2004495452.00 ppb
2016-09-12DBP 200449547ND
2016-12-05DBP 2004560814.90 ppb
2016-12-05DBP 2004560838.20 ppb
2016-12-06DBP 2004560888.50 ppb
2016-12-06DBP 2004561107.10 ppb
2016-12-06DBP 2004561157.10 ppb
2016-12-06DBP 20045617510.1 ppb
2016-12-07DBP 200456358ND
2016-12-07DBP 20045635910.4 ppb
2016-12-08DBP 200456453ND
2016-12-08DBP 20045646010.00 ppb
2016-12-08DBP 2004564618.20 ppb
2016-12-08DBP 2004564621.50 ppb
2017-03-01DBP 2004614965.50 ppb
2017-03-01DBP 2004615425.00 ppb
2017-03-01DBP 2004615438.00 ppb
2017-03-01DBP 2004615445.50 ppb
2017-03-01DBP 2004615457.80 ppb
2017-03-01DBP 2004615464.00 ppb
2017-03-02DBP 2004616504.80 ppb
2017-03-02DBP 2004616516.10 ppb
2017-03-02DBP 2004616738.80 ppb
2017-03-02DBP 2004616748.50 ppb
2017-03-02DBP 2004616752.10 ppb
2017-03-03DBP 2004617271.20 ppb
2017-06-05DBP 2004684202.60 ppb
2017-06-05DBP 2004684214.40 ppb
2017-06-06DBP 2004684763.10 ppb
2017-06-06DBP 2004684813.80 ppb
2017-06-06DBP 2004685004.40 ppb
2017-06-07DBP 2004686695.10 ppb
2017-06-07DBP 2004686703.90 ppb
2017-06-08DBP 2004688504.00 ppb
2017-06-08DBP 2004689464.10 ppb
2017-06-08DBP 2004689475.20 ppb
2017-06-08DBP 2004689483.80 ppb
2017-06-08DBP 2004689491.80 ppb
2017-09-05DBP 2004757855.80 ppb
2017-09-05DBP 2004757904.10 ppb
2017-09-05DBP 2004758007.00 ppb
2017-09-07DBP 2004761041.000 ppb
2017-09-07DBP 2004762206.90 ppb
2017-09-07DBP 2004762215.90 ppb
2017-09-07DBP 2004762225.60 ppb
2017-09-07DBP 2004762243.40 ppb
2017-09-08DBP 2004763024.30 ppb
2017-09-08DBP 2004763043.70 ppb
2017-09-08DBP 2004763054.20 ppb
2017-09-08DBP 200476306ND
2017-12-05DBP 2004833763.20 ppb
2017-12-05DBP 2004833813.60 ppb
2017-12-05DBP 2004833915.60 ppb
2017-12-07DBP 2004837704.00 ppb
2017-12-07DBP 2004837714.50 ppb
2017-12-07DBP 2004837723.30 ppb
2017-12-07DBP 2004837731.20 ppb
2017-12-07DBP 2004837745.10 ppb
2017-12-08DBP 2004838342.00 ppb
2017-12-08DBP 2004838432.90 ppb
2017-12-08DBP 2004838444.20 ppb
2017-12-08DBP 2004838452.60 ppb
2018-03-06DBP 2004892682.00 ppb
2018-03-06DBP 2004892752.90 ppb
2018-03-06DBP 2004892872.60 ppb
2018-03-07DBP 2004895374.80 ppb
2018-03-07DBP 2004895382.80 ppb
2018-03-07DBP 2004895394.40 ppb
2018-03-07DBP 2004895403.20 ppb
2018-03-07DBP 2004895412.00 ppb
2018-03-08DBP 2004895653.40 ppb
2018-03-09DBP 2004897013.70 ppb
2018-03-09DBP 2004897024.10 ppb
2018-03-09DBP 2004897031.80 ppb
2018-06-05DBP 2004959842.60 ppb
2018-06-05DBP 2004959893.20 ppb
2018-06-05DBP 2004960023.00 ppb
2018-06-06DBP 2004962353.20 ppb
2018-06-07DBP 2004963752.60 ppb
2018-06-07DBP 2004963763.00 ppb
2018-06-07DBP 2004964175.90 ppb
2018-06-08DBP 2004965073.40 ppb
2018-06-08DBP 2004965082.80 ppb
2018-06-08DBP 2004965094.70 ppb
2018-06-08DBP 2004965104.20 ppb
2018-06-08DBP 2004965112.30 ppb
2018-09-04DBP 2005037323.10 ppb
2018-09-04DBP 2005037370.900 ppb
2018-09-04DBP 2005038422.50 ppb
2018-09-04DBP 2005039122.20 ppb
2018-09-04DBP 2005039132.70 ppb
2018-09-04DBP 2005039142.80 ppb
2018-09-05DBP 2005039813.40 ppb
2018-09-05DBP 2005040862.70 ppb
2018-09-05DBP 2005040871.30 ppb
2018-09-06DBP 2005041850.900 ppb
2018-09-06DBP 2005042111.000 ppb
2018-09-07DBP 2005044413.80 ppb
2018-12-03DBP 2005143721.30 ppb
2018-12-03DBP 2005144061.60 ppb
2018-12-04DBP 2005144472.70 ppb
2018-12-04DBP 2005144522.90 ppb
2018-12-04DBP 2005146253.10 ppb
2018-12-04DBP 2005146263.50 ppb
2018-12-04DBP 2005146272.40 ppb
2018-12-04DBP 2005146282.50 ppb
2018-12-04DBP 2005146292.60 ppb
2018-12-05DBP 2005149523.10 ppb
2018-12-06DBP 2005150692.70 ppb
2018-12-06DBP 2005150702.80 ppb
2019-03-04DBP 2005232150.700 ppb
2019-03-04DBP 2005232170.900 ppb
2019-03-05DBP 2005232620.800 ppb
2019-03-05DBP 2005232691.10 ppb
2019-03-05DBP 2005234562.00 ppb
2019-03-05DBP 2005234572.40 ppb
2019-03-05DBP 2005234581.60 ppb
2019-03-05DBP 2005234591.60 ppb
2019-03-05DBP 2005234631.70 ppb
2019-03-07DBP 2005238841.20 ppb
2019-03-08DBP 2005240000.800 ppb
2019-03-08DBP 2005240021.30 ppb
2019-06-03DBP 2005343731.50 ppb
2019-06-03DBP 2005344142.80 ppb
2019-06-04DBP 2005344911.80 ppb
2019-06-04DBP 2005344961.90 ppb
2019-06-04DBP 2005346001.60 ppb
2019-06-04DBP 2005347252.70 ppb
2019-06-04DBP 2005347272.40 ppb
2019-06-04DBP 2005347292.80 ppb
2019-06-05DBP 2005350392.10 ppb
2019-06-05DBP 2005350411.90 ppb
2019-06-06DBP 2005351971.60 ppb
2019-06-07DBP 2005353571.50 ppb
2019-09-03DBP 2005469881.60 ppb
2019-09-03DBP 200546993ND
2019-09-04DBP 2005474001.80 ppb
2019-09-04DBP 2005474021.40 ppb
2019-09-04DBP 2005474031.60 ppb
2019-09-04DBP 2005474041.10 ppb
2019-09-04DBP 2005474051.30 ppb
2019-09-05DBP 2005474603.30 ppb
2019-09-05DBP 2005476671.10 ppb
2019-09-06DBP 2005478261.40 ppb
2019-09-06DBP 2005478271.30 ppb
2019-09-06DBP 2005478281.50 ppb
2019-12-02DBP 2005584051.50 ppb
2019-12-02DBP 2005584060.900 ppb
2019-12-02DBP 2005584072.00 ppb
2019-12-03DBP 2005584541.30 ppb
2019-12-03DBP 2005584591.70 ppb
2019-12-03DBP 2005586121.20 ppb
2019-12-04DBP 2005589161.10 ppb
2019-12-04DBP 2005589171.30 ppb
2019-12-04DBP 2005589191.60 ppb
2019-12-05DBP 2005590731.30 ppb
2019-12-05DBP 2005590980.800 ppb
2019-12-06DBP 2005591951.000 ppb