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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Lake Arrowhead CSD

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

 

92

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.163 ppb161ND - 2.60 ppb
20150.463 ppb163ND - 2.50 ppb
20160.713 ppb165ND - 2.70 ppb
20170.506 ppb163ND - 3.10 ppb
2018ND120ND
20190.138 ppb161ND - 2.20 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
2014-02-193761-601-1044ND
2014-02-193761-604-1022ND
2014-02-193761-603-0957ND
2014-02-193761-602-1011ND
2014-05-213761-604-1031ND
2014-05-213761-601-1049ND
2014-05-213761-603-1011ND
2014-05-213761-602-1020ND
2014-08-203761-604-0927ND
2014-08-203761-603-0905ND
2014-08-203761-601-0950ND
2014-08-203761-602-0915ND
2014-11-193761-604-1050ND
2014-11-193761-601-1110ND
2014-11-193761-602-10402.60 ppb
2014-11-193761-603-1025ND
2015-02-183761-601-0925ND
2015-02-183761-604-1015ND
2015-02-183761-603-1042ND
2015-02-183761-602-10322.50 ppb
2015-05-203761-602-1210ND
2015-05-203761-601-1043ND
2015-05-203761-604-1201ND
2015-05-203761-603-1219ND
2015-08-213761-602-1047ND
2015-08-213761-601-1145ND
2015-08-213761-604-10562.40 ppb
2015-08-213761-603-1041ND
2015-11-183761-602-1150ND
2015-11-183761-601-1120ND
2015-11-183761-604-11402.50 ppb
2015-11-183761-603-1200ND
2016-02-173761-005-0952ND
2016-02-173761-601-1054ND
2016-02-173761-604-00002.00 ppb
2016-02-173761-602-10072.50 ppb
2016-05-183761-604-11332.70 ppb
2016-05-183761-602-1146ND
2016-05-183761-601-1119ND
2016-05-183761-603-10202.20 ppb
2016-08-173761-603-1146ND
2016-08-173761-601-1106ND
2016-08-173761-604-1126ND
2016-08-173761-602-11362.00 ppb
2016-11-163761-601-1017ND
2016-11-163761-603-0930ND
2016-11-163761-602-0945ND
2016-11-163761-604-0955ND
2017-02-153761-601-1020ND
2017-02-153761-603-1105ND
2017-02-153761-602-1051ND
2017-02-153761-604-1039ND
2017-05-173761-602-0801ND
2017-05-173761-604-08122.00 ppb
2017-05-173761-603-0926ND
2017-05-173761-601-0830ND
2017-08-163761-604-0909ND
2017-08-163761-603-11453.10 ppb
2017-08-163761-601-0924ND
2017-08-163761-602-08453.00 ppb
2017-10-183761-604-0920ND
2017-10-183761-602-0910ND
2017-10-183761-601-0945ND
2017-10-183761-603-0855ND
2018-02-213761-603-0900ND
2018-02-213761-604-0925ND
2018-02-213761-601-0955ND
2018-02-213761-602-0913ND
2018-06-133761-603-0909ND
2018-06-133761-604-0932ND
2018-06-133761-602-0917ND
2018-06-133761-601-1014ND
2018-11-213761-603-1139ND
2018-11-213761-604-1118ND
2018-11-213761-602-1130ND
2018-11-213761-601-1055ND
2019-02-203761-604-1149ND
2019-02-203761-602-1203ND
2019-02-203761-601-1122ND
2019-02-203761-603-1215ND
2019-05-153761-602-0915ND
2019-05-153761-604-0926ND
2019-05-153761-601-0945ND
2019-05-153761-603-0903ND
2019-08-213761-604-0829ND
2019-08-213761-603-0807ND
2019-08-213761-601-1021ND
2019-08-213761-602-0817ND
2019-11-193761-604-1104ND
2019-11-193761-603-10462.20 ppb
2019-11-193761-602-1055ND
2019-11-193761-601-1155ND