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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

City of Hillsboro

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

 

80

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND160ND
20153.99 ppb1610ND - 8.20 ppb
20162.46 ppb169ND - 6.70 ppb
20170.431 ppb162ND - 3.50 ppb
20182.54 ppb86ND - 7.20 ppb
20192.86 ppb881.80 ppb - 4.00 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
2014-02-20AC44019ND
2014-02-20AC44023ND
2014-02-20AC44025ND
2014-02-20AC44024ND
2014-04-23AC51593ND
2014-04-23AC51588ND
2014-04-23AC51585ND
2014-04-23AC51586ND
2014-08-18AC64130ND
2014-08-18AC64131ND
2014-08-18AC64132ND
2014-08-18AC64134ND
2014-12-10AC74301ND
2014-12-10AC74306ND
2014-12-10AC74307ND
2014-12-10AC74308ND
2015-03-04AC82658ND
2015-03-04AC82705ND
2015-03-04AC82659ND
2015-03-04AC82660ND
2015-06-11AC957618.10 ppb
2015-06-11AC957578.20 ppb
2015-06-11AC957715.00 ppb
2015-06-11AC957627.70 ppb
2015-09-02AD05350ND
2015-09-02AD05313ND
2015-09-02AD053206.90 ppb
2015-09-02AD053217.70 ppb
2015-11-10AD133442.70 ppb
2015-11-10AD133417.40 ppb
2015-11-10AD133393.10 ppb
2015-11-10AD133407.00 ppb
2016-02-02AD214222.00 ppb
2016-02-02AD214242.40 ppb
2016-02-02AD21450ND
2016-02-02AD21419ND
2016-04-19AD334246.20 ppb
2016-04-19AD334206.70 ppb
2016-04-19AD334235.70 ppb
2016-04-19AD334215.70 ppb
2016-07-20AD449133.70 ppb
2016-07-20AD44911ND
2016-07-20AD449143.40 ppb
2016-07-20AD449103.60 ppb
2016-11-02AD56313ND
2016-11-02AD56315ND
2016-11-02AD56314ND
2016-11-02AD56312ND
2017-01-26AD67085ND
2017-01-26AD67116ND
2017-01-26AD67088ND
2017-01-26AD67086ND
2017-04-19Q1716124004ND
2017-04-19Q1716124003ND
2017-04-19Q1716124002ND
2017-04-19Q1716124001ND
2017-07-17Q1729185001ND
2017-07-17Q17291850023.40 ppb
2017-07-17Q17291850043.50 ppb
2017-07-17Q1729185003ND
2017-10-05Q1749164006ND
2017-10-05Q1749164005ND
2017-10-05Q1749164009ND
2017-10-05Q1749164004ND
2018-01-09Q1800807007ND
2018-01-09Q1800807006ND
2018-04-11Q18150140032.90 ppb
2018-04-11Q18150140072.70 ppb
2018-07-11Q18272610071.30 ppb
2018-07-11Q18272610061.30 ppb
2018-10-23Q18423080064.90 ppb
2018-10-23Q18423080057.20 ppb
2019-01-15Q19023090073.90 ppb
2019-01-15Q19023090064.00 ppb
2019-04-04Q19137650042.50 ppb
2019-04-04Q19137650073.60 ppb
2019-07-10Q19434880072.70 ppb
2019-07-10Q19434880062.30 ppb
2019-10-03Q19710190031.80 ppb
2019-10-03Q19710190042.10 ppb