Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Monochloroacetic acid

St John Water District 1

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

 

216

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20142.25 ppb5646ND - 10.9 ppb
20153.62 ppb32321.20 ppb - 25.6 ppb
2016ND320ND
2017ND320ND
20180.638 ppb324ND - 6.40 ppb
20192.19 ppb3218ND - 8.30 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
2014-03-05201168804ND
2014-03-05201168805ND
2014-03-052011688061.20 ppb
2014-03-052011688081.10 ppb
2014-03-052011688091.40 ppb
2014-03-052011688101.40 ppb
2014-03-052011688111.20 ppb
2014-03-052011988071.40 ppb
2014-03-05201168804ND
2014-03-05201168805ND
2014-03-052011688061.20 ppb
2014-03-052011688081.10 ppb
2014-03-052011688091.40 ppb
2014-03-052011688101.40 ppb
2014-03-052011688111.20 ppb
2014-03-052011988071.40 ppb
2014-06-042047430011.80 ppb
2014-06-042047430021.60 ppb
2014-06-042047430033.50 ppb
2014-06-042047430041.90 ppb
2014-06-04204746001ND
2014-06-04204746002ND
2014-06-042047460031.80 ppb
2014-06-042047460043.10 ppb
2014-06-042047430011.80 ppb
2014-06-042047430021.60 ppb
2014-06-042047430033.50 ppb
2014-06-042047430041.90 ppb
2014-06-04204746001ND
2014-06-04204746002ND
2014-06-042047460031.80 ppb
2014-06-042047460043.10 ppb
2014-08-272086010013.10 ppb
2014-08-272086010022.00 ppb
2014-08-27208601003ND
2014-08-272086010041.90 ppb
2014-08-272086010013.10 ppb
2014-08-272086010022.00 ppb
2014-08-27208601003ND
2014-08-272086010041.90 ppb
2014-09-182095730012.70 ppb
2014-09-182095730023.20 ppb
2014-09-182095730033.30 ppb
2014-09-1820957300410.9 ppb
2014-09-182095730012.70 ppb
2014-09-182095730023.20 ppb
2014-09-182095730033.30 ppb
2014-09-1820957300410.9 ppb
2014-12-1020135260011.000 ppb
2014-12-1020135260026.70 ppb
2014-12-1020135260034.30 ppb
2014-12-1020135260042.60 ppb
2014-12-1020135260011.000 ppb
2014-12-1020135260026.70 ppb
2014-12-1020135260034.30 ppb
2014-12-1020135260042.60 ppb
2015-03-0520167360011.30 ppb
2015-03-0520167360021.20 ppb
2015-03-0520167360031.30 ppb
2015-03-0520617360041.20 ppb
2015-03-0520167360011.30 ppb
2015-03-0520167360021.20 ppb
2015-03-0520167360031.30 ppb
2015-03-0520617360041.20 ppb
2015-06-0420208930013.60 ppb
2015-06-0420208930023.60 ppb
2015-06-0420208930032.20 ppb
2015-06-0420208930041.60 ppb
2015-06-0420208930013.60 ppb
2015-06-0420208930023.60 ppb
2015-06-0420208930032.20 ppb
2015-06-0420208930041.60 ppb
2015-09-02202509600125.6 ppb
2015-09-0220250960021.40 ppb
2015-09-0220250960032.70 ppb
2015-09-0220250960042.60 ppb
2015-09-02202509600125.6 ppb
2015-09-0220250960021.40 ppb
2015-09-0220250960032.70 ppb
2015-09-0220250960042.60 ppb
2015-12-0920298280012.00 ppb
2015-12-0920298280023.80 ppb
2015-12-0920298280032.00 ppb
2015-12-0920298280041.80 ppb
2015-12-0920298280012.00 ppb
2015-12-0920298280023.80 ppb
2015-12-0920298280032.00 ppb
2015-12-0920298280041.80 ppb
2016-03-072033512001ND
2016-03-072033512002ND
2016-03-072033512003ND
2016-03-072033512004ND
2016-03-072033512001ND
2016-03-072033512002ND
2016-03-072033512003ND
2016-03-072033512004ND
2016-06-082037926001ND
2016-06-082037926002ND
2016-06-082037926003ND
2016-06-082037926004ND
2016-06-082037926001ND
2016-06-082037926002ND
2016-06-082037926003ND
2016-06-082037926004ND
2016-09-142042676001ND
2016-09-142042676002ND
2016-09-142042676003ND
2016-09-142042676004ND
2016-09-142042676001ND
2016-09-142042676002ND
2016-09-142042676003ND
2016-09-142042676004ND
2016-12-072047037001ND
2016-12-072047051001ND
2016-12-072047056001ND
2016-12-072047058001ND
2016-12-072047037001ND
2016-12-072047051001ND
2016-12-072047056001ND
2016-12-072047058001ND
2017-03-1035300153001ND
2017-03-1035300153002ND
2017-03-1035300153003ND
2017-03-1035300153004ND
2017-03-1035300153001ND
2017-03-1035300153002ND
2017-03-1035300153003ND
2017-03-1035300153004ND
2017-06-2235320231009ND
2017-06-2235320231010ND
2017-06-2235320231011ND
2017-06-2235320231012ND
2017-06-2235320231009ND
2017-06-2235320231010ND
2017-06-2235320231011ND
2017-06-2235320231012ND
2017-09-2135337395001ND
2017-09-2135337395002ND
2017-09-2135337395003ND
2017-09-2135337395004ND
2017-09-2135337395001ND
2017-09-2135337395002ND
2017-09-2135337395003ND
2017-09-2135337395004ND
2017-12-1435363550001ND
2017-12-1435363550002ND
2017-12-1435363550003ND
2017-12-1435363550004ND
2017-12-1435363550001ND
2017-12-1435363550002ND
2017-12-1435363550003ND
2017-12-1435363550004ND
2018-03-1535380540001ND
2018-03-1535380540002ND
2018-03-1535380540003ND
2018-03-1535380540004ND
2018-03-1535380540001ND
2018-03-1535380540002ND
2018-03-1535380540003ND
2018-03-1535380540004ND
2018-06-1435398652001ND
2018-06-14353986520026.40 ppb
2018-06-1435398652003ND
2018-06-14353986520043.80 ppb
2018-06-1435398652001ND
2018-06-14353986520026.40 ppb
2018-06-1435398652003ND
2018-06-14353986520043.80 ppb
2018-09-0635416143001ND
2018-09-0635416143002ND
2018-09-0635416143003ND
2018-09-0635416143004ND
2018-09-0635416143001ND
2018-09-0635416143002ND
2018-09-0635416143003ND
2018-09-0635416143004ND
2018-12-1035436357001ND
2018-12-1035436357002ND
2018-12-1035436357003ND
2018-12-1035436357004ND
2018-12-1035436357001ND
2018-12-1035436357002ND
2018-12-1035436357003ND
2018-12-1035436357004ND
2019-03-13354545570011.50 ppb
2019-03-1335454557002ND
2019-03-13354545570031.40 ppb
2019-03-1335454557004ND
2019-03-13354545570011.50 ppb
2019-03-1335454557002ND
2019-03-13354545570031.40 ppb
2019-03-1335454557004ND
2019-06-1135475288001ND
2019-06-1135475288002ND
2019-06-1135475288003ND
2019-06-1135475288004ND
2019-06-1135475288001ND
2019-06-1135475288002ND
2019-06-1135475288003ND
2019-06-1135475288004ND
2019-09-12354975890018.30 ppb
2019-09-12354975890026.40 ppb
2019-09-12354975890035.50 ppb
2019-09-12354975890048.00 ppb
2019-09-12354975890018.30 ppb
2019-09-12354975890026.40 ppb
2019-09-12354975890035.50 ppb
2019-09-12354975890048.00 ppb
2019-12-09355175910011.30 ppb
2019-12-09355175910021.40 ppb
2019-12-09355175910031.20 ppb
2019-12-0935517591004ND
2019-12-09355175910011.30 ppb
2019-12-09355175910021.40 ppb
2019-12-09355175910031.20 ppb
2019-12-0935517591004ND