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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

City of Williamsburg

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

 

96

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.71 ppb1615ND - 3.70 ppb
20151.13 ppb166ND - 4.00 ppb
20162.55 ppb1615ND - 4.50 ppb
20171.35 ppb1612ND - 2.30 ppb
20182.16 ppb1615ND - 4.10 ppb
20190.944 ppb168ND - 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
2014-03-05E131207948ND
2014-03-05E1312079541.90 ppb
2014-03-05E1312079521.70 ppb
2014-03-05E1312079511.60 ppb
2014-06-03E1403043043.70 ppb
2014-06-03E1403043021.90 ppb
2014-06-03E1403043061.80 ppb
2014-06-11E1406024181.90 ppb
2014-09-02E1407015182.60 ppb
2014-09-02E1407015221.60 ppb
2014-09-02E1407015172.30 ppb
2014-09-02E1407015201.90 ppb
2014-12-02E1409026951.20 ppb
2014-12-02E1409035041.20 ppb
2014-12-02E1409026961.000 ppb
2014-12-02E1409027001.000 ppb
2015-03-02VA010-DCLS1.000 ppb
2015-03-02VA010-DCLSND
2015-03-02VA010-DCLSND
2015-03-02VA010-DCLSND
2015-06-02VA010-DCLSND
2015-06-02VA010-DCLS3.80 ppb
2015-06-02VA010-DCLSND
2015-06-02VA010-DCLSND
2015-09-08VA010-DCLS2.60 ppb
2015-09-08VA010-DCLS3.30 ppb
2015-09-08VA010-DCLS3.40 ppb
2015-09-08VA010-DCLS4.00 ppb
2015-12-07VA010-DCLSND
2015-12-07VA010-DCLSND
2015-12-07VA010-DCLSND
2015-12-22VA010-DCLSND
2016-03-02E1511034802.00 ppb
2016-03-02E1511034752.20 ppb
2016-03-02E1511034782.20 ppb
2016-03-02E1511034812.40 ppb
2016-06-23E1606077013.30 ppb
2016-06-23E1606077033.70 ppb
2016-06-23E1606077042.40 ppb
2016-06-23E1606077024.10 ppb
2016-09-06E1605039003.60 ppb
2016-09-06E160503903ND
2016-09-06E1605038994.10 ppb
2016-09-06E1605039014.50 ppb
2016-12-08E1609070131.50 ppb
2016-12-08E1609070141.40 ppb
2016-12-08E1609070121.40 ppb
2016-12-08E1609070162.00 ppb
2017-03-01E1612069631.90 ppb
2017-03-01E1612069591.60 ppb
2017-03-01E1612069581.30 ppb
2017-03-01E1612069622.30 ppb
2017-06-01E1703017381.40 ppb
2017-06-01E1703017392.10 ppb
2017-06-01E1703017361.60 ppb
2017-06-01E1703017352.30 ppb
2017-09-0117-15937-HAAND
2017-09-0117-15936-HAAND
2017-09-0117-15938-HAAND
2017-09-0117-15935-HAAND
2017-12-06E1709022052.00 ppb
2017-12-06E1709022041.40 ppb
2017-12-06E1709022032.30 ppb
2017-12-06E1709022071.40 ppb
2018-03-05E1712004001.60 ppb
2018-03-05E1712003981.90 ppb
2018-03-05E1712003971.80 ppb
2018-03-05E1712003942.00 ppb
2018-06-11E1803020372.60 ppb
2018-06-11E1803020312.20 ppb
2018-06-11E1803020342.80 ppb
2018-06-11E1803020362.10 ppb
2018-09-11E1807004423.40 ppb
2018-09-11E1807004403.80 ppb
2018-09-11E1807004362.00 ppb
2018-09-11E1807004354.10 ppb
2018-12-11E1810039221.30 ppb
2018-12-11E1810039251.50 ppb
2018-12-11E1810039281.50 ppb
2018-12-11E181003929ND
2019-03-01E190100228ND
2019-03-01E190100230ND
2019-03-01E190100234ND
2019-03-04E190100232ND
2019-06-03E1904036361.50 ppb
2019-06-03E1904036422.10 ppb
2019-06-03E1904036412.10 ppb
2019-06-03E1904036402.20 ppb
2019-09-03E1907052162.20 ppb
2019-09-03E1907052191.90 ppb
2019-09-03E1907052181.80 ppb
2019-09-03E190705214ND
2019-12-16E191200013ND
2019-12-16E191200011ND
2019-12-16E191200010ND
2019-12-16E1912000081.30 ppb