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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Vallecitos Water District

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

 

184

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.88 ppb3215ND - 6.30 ppb
20150.163 ppb322ND - 2.60 ppb
20160.134 ppb322ND - 2.20 ppb
2017ND320ND
2018ND320ND
2019ND240ND

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
2014-01-152706-900-0915ND
2014-01-152706-901-1100ND
2014-01-152706-902-0940ND
2014-01-152706-903-1025ND
2014-01-152706-904-1015ND
2014-01-152706-905-0845ND
2014-01-152706-906-0905ND
2014-01-152706-907-0810ND
2014-04-162706-900-0910ND
2014-04-162706-901-0730ND
2014-04-162706-902-1110ND
2014-04-162706-903-1040ND
2014-04-162706-904-0950ND
2014-04-162706-905-0840ND
2014-04-162706-906-1140ND
2014-04-162706-907-1200ND
2014-07-162706-900-10353.40 ppb
2014-07-162706-901-11253.20 ppb
2014-07-162706-902-08253.60 ppb
2014-07-162706-903-07503.50 ppb
2014-07-162706-904-10003.70 ppb
2014-07-162706-905-10553.00 ppb
2014-07-162706-906-0855ND
2014-07-162706-907-09303.30 ppb
2014-10-152706-900-11456.30 ppb
2014-10-152706-901-10104.40 ppb
2014-10-152706-902-12154.00 ppb
2014-10-152706-903-11454.20 ppb
2014-10-152706-904-11003.70 ppb
2014-10-152706-905-11155.10 ppb
2014-10-152706-906-10154.90 ppb
2014-10-152706-907-10504.00 ppb
2015-01-212706-900-1050ND
2015-01-212706-901-0900ND
2015-01-212706-902-1100ND
2015-01-212706-903-1130ND
2015-01-212706-904-1115ND
2015-01-212706-905-0955ND
2015-01-212706-906-1030ND
2015-01-212706-907-1000ND
2015-04-152706-900-0910ND
2015-04-152706-901-0830ND
2015-04-152706-902-0850ND
2015-04-152706-903-0805ND
2015-04-152706-904-1000ND
2015-04-152706-905-0930ND
2015-04-152706-906-0940ND
2015-04-152706-907-1015ND
2015-07-150007-900-1015ND
2015-07-150007-901-0920ND
2015-07-150007-902-0910ND
2015-07-150007-903-0840ND
2015-07-150007-904-1125ND
2015-07-150007-905-1045ND
2015-07-150007-906-0940ND
2015-07-150007-907-1245ND
2015-10-212706-900-08352.60 ppb
2015-10-212706-901-0940ND
2015-10-212706-902-09002.60 ppb
2015-10-212706-903-0930ND
2015-10-212706-904-0755ND
2015-10-212706-905-0915ND
2015-10-212706-906-1005ND
2015-10-212706-907-1040ND
2016-01-202706-900-1015ND
2016-01-202706-901-0910ND
2016-01-202706-902-1015ND
2016-01-202706-903-1105ND
2016-01-202706-904-1120ND
2016-01-202706-905-09402.10 ppb
2016-01-202706-906-0940ND
2016-01-202706-907-0910ND
2016-04-202706-900-0950ND
2016-04-202706-901-0905ND
2016-04-202706-902-1000ND
2016-04-202706-903-0850ND
2016-04-202706-904-1100ND
2016-04-202706-905-1035ND
2016-04-202706-906-09252.20 ppb
2016-04-202706-907-0950ND
2016-07-202706-900-0925ND
2016-07-202706-901-1025ND
2016-07-202706-902-1000ND
2016-07-202706-903-0940ND
2016-07-202706-904-0845ND
2016-07-202706-905-0945ND
2016-07-202706-906-1040ND
2016-07-202706-907-1115ND
2016-10-192706-900-0950ND
2016-10-192706-901-0900ND
2016-10-192706-902-1000ND
2016-10-192706-903-1030ND
2016-10-192706-904-1100ND
2016-10-192706-905-1025ND
2016-10-192706-906-0930ND
2016-10-192706-907-0900ND
2017-01-180007-900-1000ND
2017-01-180007-901-1030ND
2017-01-180007-902-0950ND
2017-01-180007-903-0925ND
2017-01-180007-904-1240ND
2017-01-180007-905-0930ND
2017-01-180007-906-1050ND
2017-01-180007-907-1120ND
2017-04-190007-900-1000ND
2017-04-190007-901-0830ND
2017-04-190007-902-0840ND
2017-04-190007-903-0800ND
2017-04-190007-904-1045ND
2017-04-190007-905-0920ND
2017-04-190007-906-0920ND
2017-04-190007-907-0940ND
2017-07-190007-900-0920ND
2017-07-190007-901-0745ND
2017-07-190007-902-0745ND
2017-07-190007-903-0930ND
2017-07-190007-904-0945ND
2017-07-190007-905-0900ND
2017-07-190007-906-0815ND
2017-07-190007-907-0845ND
2017-10-180007-900-1000ND
2017-10-180007-901-0920ND
2017-10-180007-902-0900ND
2017-10-180007-903-0820ND
2017-10-180007-904-1100ND
2017-10-180007-905-0840ND
2017-10-180007-906-0925ND
2017-10-180007-907-0750ND
2018-01-170007-900-1050ND
2018-01-170007-901-0910ND
2018-01-170007-902-0855ND
2018-01-170007-903-0830ND
2018-01-170007-904-1125ND
2018-01-170007-905-0945ND
2018-01-170007-906-0930ND
2018-01-170007-907-1000ND
2018-04-180007-900-0945ND
2018-04-180007-901-0830ND
2018-04-180007-902-1015ND
2018-04-180007-903-0945ND
2018-04-180007-904-1030ND
2018-04-180007-905-0930ND
2018-04-180007-906-1055ND
2018-04-180007-907-1125ND
2018-07-180007-900-0850ND
2018-07-180007-901-0850ND
2018-07-180007-902-0855ND
2018-07-180007-903-0830ND
2018-07-180007-904-0755ND
2018-07-180007-905-0830ND
2018-07-180007-906-0940ND
2018-07-180007-907-0730ND
2018-10-170007-900-1010ND
2018-10-170007-901-0840ND
2018-10-170007-902-0830ND
2018-10-170007-903-0800ND
2018-10-170007-904-1040ND
2018-10-170007-905-0930ND
2018-10-170007-906-0900ND
2018-10-170007-907-0935ND
2019-01-160007-900-1105ND
2019-01-160007-901-0940ND
2019-01-160007-902-0950ND
2019-01-160007-903-0900ND
2019-01-160007-904-1150ND
2019-01-160007-905-1035ND
2019-01-160007-906-1040ND
2019-01-160007-907-1105ND
2019-04-170007-900-1050ND
2019-04-170007-901-0840ND
2019-04-170007-902-0915ND
2019-04-170007-903-0925ND
2019-04-170007-904-0845ND
2019-04-170007-905-1030ND
2019-04-170007-906-0830ND
2019-04-170007-907-1310ND
2019-07-170007-900-1010ND
2019-07-170007-901-0930ND
2019-07-170007-902-1005ND
2019-07-170007-903-1055ND
2019-07-170007-904-1110ND
2019-07-170007-905-0815ND
2019-07-170007-906-0925ND
2019-07-170007-907-0830ND