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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

San Luis Obispo Water Department

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

 

100

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND160ND
20150.188 ppb161ND - 3.00 ppb
20160.750 ppb166ND - 2.00 ppb
2017ND200ND
20180.125 ppb161ND - 2.00 ppb
20190.125 ppb161ND - 2.00 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
2014-02-115867-020-1110ND
2014-02-115867-018-1130ND
2014-02-115867-019-1100ND
2014-02-115867-021-1045ND
2014-05-125867-021-1130ND
2014-05-125867-020-1145ND
2014-05-125867-019-1155ND
2014-05-125867-018-1215ND
2014-08-115867-021-1340ND
2014-08-115867-020-1400ND
2014-08-115867-019-1415ND
2014-08-115867-018-1320ND
2014-11-135867-020-1430ND
2014-11-135867-019-1445ND
2014-11-135867-021-1345ND
2014-11-135867-018-1400ND
2015-02-125867-021-1535ND
2015-02-125867-020-1505ND
2015-02-125867-019-1450ND
2015-02-125867-018-1520ND
2015-05-145867-021-1035ND
2015-05-145867-020-1015ND
2015-05-145867-018-1050ND
2015-05-145867-019-1000ND
2015-08-125867-019-0900ND
2015-08-125867-018-08403.00 ppb
2015-08-125867-021-0825ND
2015-08-125867-020-0915ND
2015-11-105867-019-1315ND
2015-11-105867-018-1245ND
2015-11-105867-021-1300ND
2015-11-105867-020-1325ND
2016-02-085867-019-1435ND
2016-02-085867-018-1500ND
2016-02-085867-021-15202.00 ppb
2016-02-085867-020-14502.00 ppb
2016-05-115867-019-1600ND
2016-05-115867-018-1515ND
2016-05-115867-021-1530ND
2016-05-115867-020-1545ND
2016-08-085867-019-14402.00 ppb
2016-08-085867-018-1410ND
2016-08-085867-021-14252.00 ppb
2016-08-085867-020-14552.00 ppb
2016-11-145867-018-1500ND
2016-11-145867-020-1525ND
2016-11-145867-021-1550ND
2016-11-145867-019-15352.00 ppb
2017-02-155867-019-1625ND
2017-02-155867-018-1550ND
2017-02-155867-020-1615ND
2017-02-155867-021-1645ND
2017-05-105867-021-1525ND
2017-05-105867-018-1510ND
2017-05-105867-019-1440ND
2017-05-105867-020-1450ND
2017-07-105867-021-1105ND
2017-07-105867-019-1015ND
2017-07-105867-018-1045ND
2017-07-105867-020-1025ND
2017-08-145867-021-1100ND
2017-08-145867-018-1050ND
2017-08-145867-020-1030ND
2017-08-145867-019-1020ND
2017-11-075867-020-1515ND
2017-11-075867-021-1555ND
2017-11-075867-018-1540ND
2017-11-075867-019-1525ND
2018-02-145867-020-1450ND
2018-02-145867-021-1520ND
2018-02-145867-018-1505ND
2018-02-145867-019-1435ND
2018-05-085867-021-1450ND
2018-05-085867-018-1435ND
2018-05-085867-019-1405ND
2018-05-085867-020-1415ND
2018-08-105867-020-1330ND
2018-08-105867-021-1225ND
2018-08-105867-019-1315ND
2018-08-105867-018-1245ND
2018-11-145867-021-1400ND
2018-11-145867-020-1345ND
2018-11-145867-019-1330ND
2018-11-145867-018-14152.00 ppb
2019-02-125867-021-1140ND
2019-02-125867-018-1155ND
2019-02-125867-019-1110ND
2019-02-125867-020-11152.00 ppb
2019-05-165867-018-1400ND
2019-05-165867-020-1230ND
2019-05-165867-021-1250ND
2019-05-165867-019-1215ND
2019-08-135867-020-1440ND
2019-08-135867-018-1518ND
2019-08-135867-021-1500ND
2019-08-135867-019-1430ND
2019-11-125867-020-1410ND
2019-11-125867-019-1355ND
2019-11-125867-018-1445ND
2019-11-125867-021-1430ND