Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Monochloroacetic acid

City of Hays

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

 

94

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.181 ppb161ND - 2.90 ppb
20150.963 ppb166ND - 3.50 ppb
20160.563 ppb164ND - 2.70 ppb
20172.38 ppb1411ND - 4.50 ppb
20182.36 ppb167ND - 15.0 ppb
20191.10 ppb163ND - 7.50 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
2014-01-0631363ND
2014-01-0631360ND
2014-01-0631356ND
2014-01-0631353ND
2014-04-21100899ND
2014-04-21100880ND
2014-04-21100845ND
2014-04-21100844ND
2014-07-07146865ND
2014-07-07146864ND
2014-07-07146902ND
2014-07-07146903ND
2014-10-132131802.90 ppb
2014-10-13213175ND
2014-10-13213167ND
2014-10-13213165ND
2015-01-052582052.90 ppb
2015-01-052582043.50 ppb
2015-01-052582032.00 ppb
2015-01-052582022.00 ppb
2015-06-01340820ND
2015-06-01340819ND
2015-06-01340821ND
2015-06-01340822ND
2015-07-13366685ND
2015-07-13366684ND
2015-07-13366683ND
2015-07-133666822.00 ppb
2015-10-12421731ND
2015-10-12421730ND
2015-10-124217293.00 ppb
2015-10-12421728ND
2016-01-11475231ND
2016-01-11475228ND
2016-01-11475229ND
2016-01-11475230ND
2016-04-04520317ND
2016-04-04520316ND
2016-04-04520315ND
2016-04-04520314ND
2016-07-12582018ND
2016-07-12582017ND
2016-07-12582016ND
2016-07-12582015ND
2016-10-036352142.20 ppb
2016-10-036352152.00 ppb
2016-10-036352132.10 ppb
2016-10-036352122.70 ppb
2017-01-09680013ND
2017-01-09680012ND
2017-01-096800112.80 ppb
2017-01-096800102.50 ppb
2017-04-117410262.00 ppb
2017-04-11741025ND
2017-04-117410242.20 ppb
2017-04-117410232.00 ppb
2017-07-177996434.30 ppb
2017-07-177996404.50 ppb
2017-07-177996414.30 ppb
2017-07-177996424.10 ppb
2017-10-028519642.30 ppb
2017-10-028519612.30 ppb
2018-01-169080372.30 ppb
2018-01-169080362.90 ppb
2018-01-169080352.30 ppb
2018-01-16908034ND
2018-04-16938270ND
2018-04-16938271ND
2018-04-169382732.10 ppb
2018-04-16938272ND
2018-08-2010294864.30 ppb
2018-08-201029485ND
2018-08-20102948415.0 ppb
2018-08-2010294838.90 ppb
2018-10-151061603ND
2018-10-151061602ND
2018-10-151061601ND
2018-10-151061600ND
2019-02-251126397ND
2019-02-251126396ND
2019-02-2511263986.20 ppb
2019-02-251126399ND
2019-04-1511392147.50 ppb
2019-04-151139213ND
2019-04-151139212ND
2019-04-151139211ND
2019-08-051216304ND
2019-08-051216303ND
2019-08-051216302ND
2019-08-0512163013.90 ppb
2019-10-141259821ND
2019-10-141259824ND
2019-10-141259823ND
2019-10-141259822ND