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EWG's Tap Water Database — 2019 UPDATE

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Monochloroacetic acid

Northwestern W and Sd-wtln 200

NOTE: Northwestern W and Sd-wtln 200 purchases water from Oregon City which is required to test for monochloroacetic acid. Sample information shown below was taken by Oregon City.

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.

 

96

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND40ND
20130.250 ppb81ND - 2.00 ppb
2014ND80ND
2015ND80ND
20160.700 ppb82ND - 3.00 ppb
2017ND80ND

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

NOTE: Northwestern W and Sd-wtln 200 purchases water from Oregon City which is required to test for monochloroacetic acid. Sample information shown below was taken by Oregon City.

Date Lab ID Result
2012-02-17AG15290ND
2012-02-17AG15291ND
2012-02-17AG15292ND
2012-02-17AG15293ND
2012-05-08AG20635ND
2012-05-08AG20634ND
2012-05-08AG20633ND
2012-05-08AG20632ND
2012-07-03AG245512.40 ppb
2012-07-03AG245482.50 ppb
2012-07-03AG245492.40 ppb
2012-07-03AG245502.20 ppb
2012-10-26AG32761ND
2012-10-26AG32760ND
2012-10-26AG32759ND
2012-10-26AG32758ND
2013-01-08AG37733ND
2013-01-08AG37734ND
2013-01-08AG37735ND
2013-01-08AG37736ND
2013-04-09AG43156ND
2013-04-09AG43155ND
2013-04-09AG43154ND
2013-04-09AG43153ND
2013-07-09AG49741ND
2013-07-09AG49744ND
2013-07-09AG49743ND
2013-07-09AG49742ND
2013-10-08AG56556ND
2013-10-08AG56557ND
2013-10-08AG56558ND
2013-10-08AG56555ND
2014-01-13AG62672ND
2014-01-13AG62671ND
2014-01-13AG62670ND
2014-01-13AG62669ND
2014-04-14AG68446ND
2014-04-14AG68444ND
2014-04-14AG68443ND
2014-04-14AG68445ND
2014-07-10AG75203ND
2014-07-10AG75200ND
2014-07-10AG75201ND
2014-07-10AG75202ND
2014-10-10AG82815ND
2014-10-10AG82814ND
2014-10-10AG82813ND
2014-10-10AG82812ND
2015-01-12AG88875ND
2015-01-12AG88874ND
2015-01-12AG88873ND
2015-01-12AG88872ND
2015-04-08AG93994ND
2015-04-08AG93995ND
2015-04-08AG93996ND
2015-04-08AG93997ND
2015-07-14AH011152.40 ppb
2015-07-14AH011144.10 ppb
2015-07-14AH011133.40 ppb
2015-07-14AH011123.40 ppb
2015-10-07AH07534ND
2015-10-08AH07533ND
2015-10-08AH07532ND
2015-10-08AH07531ND
2016-01-14AH13649ND
2016-01-14AH13650ND
2016-01-14AH13651ND
2016-01-14AH13652ND
2016-04-13AH19290ND
2016-04-13AH19289ND
2016-04-13AH19288ND
2016-04-13AH19287ND
2016-07-08AH255842.20 ppb
2016-07-08AH255832.20 ppb
2016-07-08AH255823.10 ppb
2016-07-08AH255852.30 ppb
2016-10-13AH334642.60 ppb
2016-10-13AH334652.40 ppb
2016-10-13AH334662.50 ppb
2016-10-13AH334673.30 ppb
2017-01-12AH40528ND
2017-01-12AH40527ND
2017-01-12AH40526ND
2017-01-12AH40525ND
2017-04-12AH47122ND
2017-04-12AH47121ND
2017-04-12AH47120ND
2017-04-12AH47119ND
2017-07-11AH54224ND
2017-07-11AH54223ND
2017-07-11AH54222ND
2017-07-11AH54221ND
2017-10-11AH61963ND
2017-10-11AH61964ND
2017-10-11AH61965ND
2017-10-11AH61966ND