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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

City of Great Falls

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

 

205

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.27 ppb3229ND - 2.10 ppb
20150.772 ppb3218ND - 2.20 ppb
20160.541 ppb3217ND - 1.40 ppb
20170.865 ppb3220ND - 1.90 ppb
20180.388 ppb348ND - 1.80 ppb
20190.244 ppb437ND - 1.60 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
2014-02-18B14021350-003B1.20 ppb
2014-02-18B14021350-004BND
2014-02-19B14021350-001B1.90 ppb
2014-02-19B14021350-005B1.10 ppb
2014-02-19B14021350-008B1.70 ppb
2014-02-20B14021350-002B1.30 ppb
2014-02-20B14021350-006B1.20 ppb
2014-02-20B14021350-007B1.20 ppb
2014-05-08B14050856-001B1.50 ppb
2014-05-08B14050856-002B1.000 ppb
2014-05-08B14050856-003B2.10 ppb
2014-05-08B14050856-004B2.00 ppb
2014-05-27B14052535-001B1.50 ppb
2014-05-27B14052535-002BND
2014-05-28B14052535-004B1.30 ppb
2014-05-29B14052535-003B1.60 ppb
2014-08-12B14081497-007B1.40 ppb
2014-08-13B14081497-003B1.40 ppb
2014-08-13B14081497-004B1.30 ppb
2014-08-13B14081497-005B1.80 ppb
2014-08-14B14081497-001B1.90 ppb
2014-08-14B14081497-002B1.000 ppb
2014-08-14B14081497-006B1.80 ppb
2014-08-14B14081497-008B1.50 ppb
2014-11-24B14111959-001B1.20 ppb
2014-11-24B14111959-004B0.910 ppb
2014-11-24B14111959-005B1.10 ppb
2014-11-24B14111959-007BND
2014-11-24B14111959-008B0.800 ppb
2014-11-25B14111959-002B1.40 ppb
2014-11-25B14111959-003B1.20 ppb
2014-11-25B14111959-006B1.30 ppb
2015-02-12B15021136-001BND
2015-02-12B15021136-002BND
2015-02-12B15021136-003BND
2015-02-18B15021552-001B0.790 ppb
2015-02-18B15021552-002B1.20 ppb
2015-02-18B15021552-003B1.10 ppb
2015-02-18B15021552-005B1.000 ppb
2015-02-19B15021552-004B1.50 ppb
2015-05-20B15051785-001B1.70 ppb
2015-05-20B15051785-002B2.20 ppb
2015-05-20B15051785-003B1.80 ppb
2015-05-20B15051785-004B1.90 ppb
2015-05-20B15051785-005B1.60 ppb
2015-05-20B15051785-006B1.60 ppb
2015-05-20B15051785-007B1.90 ppb
2015-05-20B15051785-008B1.50 ppb
2015-08-18B15081763-001B1.20 ppb
2015-08-18B15081763-002B1.10 ppb
2015-08-18B15081763-003BND
2015-08-18B15081763-004BND
2015-08-18B15081763-005BND
2015-08-18B15081763-006B0.940 ppb
2015-08-18B15081763-007B0.830 ppb
2015-08-18B15081763-008B0.840 ppb
2015-11-19B15111686-001BND
2015-11-19B15111686-002BND
2015-11-19B15111686-003BND
2015-11-19B15111686-004BND
2015-11-19B15111686-005BND
2015-11-19B15111686-006BND
2015-11-19B15111686-007BND
2015-11-19B15111686-008BND
2016-02-11B16021106-001BND
2016-02-11B16021106-002B0.800 ppb
2016-02-11B16021106-003BND
2016-02-11B16021106-004BND
2016-02-11B16021106-005B0.780 ppb
2016-02-11B16021106-006BND
2016-02-11B16021106-007BND
2016-02-11B16021106-008BND
2016-05-11B16051040-001B0.960 ppb
2016-05-11B16051040-002B0.920 ppb
2016-05-11B16051040-003B0.960 ppb
2016-05-11B16051040-004B0.880 ppb
2016-05-11B16051040-005B0.950 ppb
2016-05-11B16051040-006B0.830 ppb
2016-05-11B16051040-007B0.930 ppb
2016-05-18B16051544-001BND
2016-08-18B16081963-001B1.40 ppb
2016-08-18B16081963-002B1.10 ppb
2016-08-18B16081963-003B1.40 ppb
2016-08-18B16081963-004BND
2016-08-18B16081963-005B1.10 ppb
2016-08-18B16081963-006B1.000 ppb
2016-08-18B16081963-007B1.10 ppb
2016-08-23B16082339-001B1.10 ppb
2016-11-17B16111589-001B1.10 ppb
2016-11-17B16111589-002BND
2016-11-17B16111589-003BND
2016-11-17B16111589-004BND
2016-11-17B16111589-005BND
2016-11-17B16111589-006BND
2016-11-17B16111589-007BND
2016-11-21B16111800-001BND
2017-02-14B17020956-001B0.860 ppb
2017-02-14B17020956-002B0.800 ppb
2017-02-14B17020956-003B0.870 ppb
2017-02-14B17020956-004BND
2017-02-14B17020956-005B0.950 ppb
2017-02-14B17020956-006B0.840 ppb
2017-02-14B17020956-007B0.800 ppb
2017-02-14B17020956-008BND
2017-05-17B17051728-001B1.80 ppb
2017-05-17B17051728-002B1.70 ppb
2017-05-17B17051728-003B1.70 ppb
2017-05-17B17051728-004B1.90 ppb
2017-05-17B17051728-005B1.90 ppb
2017-05-17B17051728-006B1.80 ppb
2017-05-17B17051728-007B1.80 ppb
2017-05-18B17051830-001B1.60 ppb
2017-08-16B17082053-001BND
2017-08-16B17082053-002BND
2017-08-16B17082053-003BND
2017-08-16B17082053-004BND
2017-08-16B17082053-005BND
2017-08-16B17082053-006BND
2017-08-17B17082053-007BND
2017-08-17B17082053-008BND
2017-11-16B17111476-001B1.40 ppb
2017-11-16B17111476-002BND
2017-11-16B17111476-003B1.80 ppb
2017-11-16B17111476-004B1.30 ppb
2017-11-16B17111476-005B1.80 ppb
2017-11-20B17111867-001B0.870 ppb
2017-11-20B17111867-002BND
2017-11-20B17111867-003B1.20 ppb
2018-02-13B18021264-001B1.60 ppb
2018-02-13B18021264-002B1.60 ppb
2018-02-13B18021264-003B1.60 ppb
2018-02-13B18021264-004B1.80 ppb
2018-02-13B18021264-005B1.70 ppb
2018-02-13B18021264-006B1.70 ppb
2018-02-15B18021264-007B1.70 ppb
2018-02-15B18021264-008B1.50 ppb
2018-05-18B18052149-002BND
2018-05-18B18052149-007BND
2018-05-18B18052149-008BND
2018-05-21B18052149-001BND
2018-05-21B18052149-003BND
2018-05-21B18052149-004BND
2018-05-21B18052149-005BND
2018-05-21B18052149-006BND
2018-08-15B18081851-001BND
2018-08-15B18081851-002BND
2018-08-15B18081851-003BND
2018-08-15B18081851-004BND
2018-08-15B18081851-006BND
2018-08-15B18081851-007BND
2018-08-15B18081851-008BND
2018-08-16B18081851-005BND
2018-11-01B18110214-001BND
2018-11-01B18110214-002BND
2018-11-19B18111832-001BND
2018-11-19B18111832-003BND
2018-11-19B18111832-004BND
2018-11-19B18111832-006BND
2018-11-19B18111832-008BND
2018-11-20B18111832-002BND
2018-11-20B18111832-005BND
2018-11-20B18111832-007BND
2019-01-30B19012302-001BND
2019-02-12B19021080-001BND
2019-02-12B19021080-002BND
2019-02-12B19021080-006BND
2019-02-12B19021080-007BND
2019-02-13B19021080-003BND
2019-02-13B19021080-004BND
2019-02-13B19021080-005BND
2019-02-13B19021080-008BND
2019-02-13B19021081-001BND
2019-03-25B19032203-001BND
2019-03-27B19032376-001BND
2019-03-28B19032376-002BND
2019-03-28B19032376-003BND
2019-03-28B19032376-004BND
2019-03-28B19032376-005BND
2019-03-28B19032376-006BND
2019-03-28B19032376-007BND
2019-03-28B19032376-008BND
2019-05-21B19052229-001BND
2019-05-21B19052229-004BND
2019-05-21B19052229-006BND
2019-05-21B19052229-008BND
2019-05-22B19052229-002BND
2019-05-22B19052229-003BND
2019-05-22B19052229-005BND
2019-05-22B19052229-007BND
2019-08-21B19082305-001BND
2019-08-21B19082305-004BND
2019-08-21B19082305-005BND
2019-08-21B19082305-006BND
2019-08-22B19082305-002BND
2019-08-22B19082305-003BND
2019-08-22B19082305-007BND
2019-08-22B19082305-008BND
2019-11-19B19112018-001B1.60 ppb
2019-11-19B19112018-002B1.40 ppb
2019-11-19B19112018-004BND
2019-11-19B19112018-006B1.50 ppb
2019-11-19B19112018-007B1.50 ppb
2019-11-19B19112018-008B1.50 ppb
2019-11-20B19112018-003B1.40 ppb
2019-11-20B19112018-005B1.60 ppb