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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Lafayette

Haloacetic acids are formed when disinfectants such as chlorine are added to tap water. The group of five haloacetic acids regulated by federal standards includes monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, monobromoacetic acid and dibromoacetic acid. Read More.

Haloacetic acids are harmful during pregnancy and may increase the risk of cancer. Haloacetic acids are� genotoxic, which means that they induce mutations and DNA damage. Multiple studies by the National Toxicology Program have demonstrated the cancer-causing properties of individual haloacetic acids in laboratory animals. The Department of Health and Human Services is currently considering listing di- or tri-haloacetic acids for possible inclusion in its comprehensive Report on Carcinogens.

Click here to read more about disinfection byproducts.

MORE ABOUT THIS CONTAMINANT

 

96

Samples

0

Samples exceeding legal limit (MCL)

36

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.794 ppb165ND - 2.90 ppb
20150.250 ppb163ND - 1.50 ppb
20160.613 ppb168ND - 2.10 ppb
20170.0875 ppb161ND - 1.40 ppb
20181.22 ppb1610ND - 3.50 ppb
20191.03 ppb169ND - 2.80 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for the group of five haloacetic acids, or HAA5, was defined in a peer-reviewed scientific study by EWG and represents a one-in-a-million lifetime cancer risk level. This health guideline protects against cancer.

EPA Maximum Contaminant
Level (MCL) 60 ppb

The legal limit for the group of five haloacetic acids (HAA5), established in 1998, was based on the need for residual disinfectant levels in water served to customers and the cost of treatment. This limit does not fully protect against the risk of cancer and harm to the developing fetus due to exposure to haloacetic acids.

ppb = parts per billion

All test results

Date Lab ID Result
2014-03-20AI36488ND
2014-03-20AI36487ND
2014-03-20AI36486ND
2014-03-20AI36485ND
2014-06-16AI43323ND
2014-06-16AI43322ND
2014-06-16AI43321ND
2014-06-16AI43320ND
2014-09-16AI540382.40 ppb
2014-09-16AI54037ND
2014-09-16AI54039ND
2014-09-16AI54040ND
2014-12-17AI617352.60 ppb
2014-12-17AI617342.30 ppb
2014-12-17AI617332.50 ppb
2014-12-17AI617322.90 ppb
2015-03-18AI69329ND
2015-03-18AI69328ND
2015-03-18AI69327ND
2015-03-18AI69326ND
2015-06-16AI79919ND
2015-06-16AI79920ND
2015-06-16AI79922ND
2015-06-16AI799211.50 ppb
2015-09-15AI89814ND
2015-09-15AI89813ND
2015-09-15AI89812ND
2015-09-15AI89811ND
2015-12-15AJ029481.10 ppb
2015-12-15AJ029471.40 ppb
2015-12-15AJ02946ND
2015-12-15AJ02945ND
2016-03-15AJ082011.20 ppb
2016-03-15AJ08200ND
2016-03-15AJ082021.000 ppb
2016-03-15AJ082031.10 ppb
2016-06-14AJ141491.10 ppb
2016-06-14AJ141481.20 ppb
2016-06-14AJ141471.10 ppb
2016-06-14AJ141461.000 ppb
2016-09-21AJ28484ND
2016-09-21AJ284832.10 ppb
2016-09-21AJ28482ND
2016-09-21AJ28481ND
2016-12-20AJ37244ND
2016-12-20AJ37247ND
2016-12-20AJ37246ND
2016-12-20AJ37245ND
2017-03-20AJ48350ND
2017-03-20AJ48349ND
2017-03-20AJ48348ND
2017-03-20AJ48347ND
2017-06-21AJ58216ND
2017-06-21AJ58215ND
2017-06-21AJ582141.40 ppb
2017-06-21AJ58213ND
2017-09-18AJ68295ND
2017-09-18AJ68294ND
2017-09-18AJ68296ND
2017-09-18AJ68297ND
2017-12-18AJ75640ND
2017-12-18AJ75639ND
2017-12-18AJ75638ND
2017-12-18AJ75637ND
2018-03-20AJ862282.60 ppb
2018-03-20AJ86227ND
2018-03-20AJ862262.80 ppb
2018-03-20AJ862253.20 ppb
2018-06-18AJ91845ND
2018-06-18AJ91846ND
2018-06-18AJ918481.10 ppb
2018-06-18AJ918471.40 ppb
2018-09-18AK013953.50 ppb
2018-09-18AK013941.30 ppb
2018-09-18AK01393ND
2018-09-18AK01392ND
2018-12-12AK080521.50 ppb
2018-12-12AK08051ND
2018-12-12AK080501.10 ppb
2018-12-12AK080491.000 ppb
2019-03-20AK136262.60 ppb
2019-03-20AK136251.30 ppb
2019-03-20AK136271.10 ppb
2019-03-20AK136282.80 ppb
2019-06-18AK200342.50 ppb
2019-06-18AK20033ND
2019-06-18AK20032ND
2019-06-18AK200311.10 ppb
2019-09-17AK310582.20 ppb
2019-09-17AK31057ND
2019-09-17AK31056ND
2019-09-17AK31055ND
2019-12-09AK377851.70 ppb
2019-12-09AK377881.10 ppb
2019-12-09AK37787ND
2019-12-09AK37786ND