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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Green Valley SUD

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)

42

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20143.68 ppb164ND - 19.9 ppb
20153.79 ppb165ND - 18.1 ppb
20161.67 ppb164ND - 12.1 ppb
20172.31 ppb167ND - 9.50 ppb
20183.04 ppb168ND - 20.6 ppb
20195.40 ppb1614ND - 55.0 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
2014-02-19AC43551ND
2014-02-19AC43587ND
2014-02-19AC43559ND
2014-02-19AC4355319.9 ppb
2014-04-03AC49227ND
2014-04-03AC49204ND
2014-04-03AC49207ND
2014-04-03AC4920610.4 ppb
2014-07-14AC59615ND
2014-07-14AC59589ND
2014-07-14AC59608ND
2014-09-18AC6748711.0 ppb
2014-11-11AC71727ND
2014-11-11AC71728ND
2014-11-11AC71725ND
2014-11-11AC7172217.5 ppb
2015-01-27AC77880ND
2015-01-27AC77881ND
2015-01-27AC77917ND
2015-01-27AC7790214.6 ppb
2015-04-15AC883505.00 ppb
2015-04-15AC88351ND
2015-04-15AC88352ND
2015-04-15AC88348ND
2015-07-22AD00612ND
2015-07-22AD00567ND
2015-07-22AD0060910.2 ppb
2015-07-22AD0061312.8 ppb
2015-11-20AD14377ND
2015-11-20AD14369ND
2015-11-20AD14370ND
2015-11-20AD1441218.1 ppb
2016-01-20AD18886ND
2016-01-20AD1887612.1 ppb
2016-01-20AD18888ND
2016-01-20AD18895ND
2016-04-06AD32012ND
2016-04-06AD32043ND
2016-04-06AD32014ND
2016-04-06AD320106.80 ppb
2016-09-16AD50012ND
2016-09-16AD50015ND
2016-09-16AD50057ND
2016-09-16AD500395.10 ppb
2016-11-03AD564402.70 ppb
2016-11-03AD56439ND
2016-11-03AD56438ND
2016-11-03AD56441ND
2017-01-30AD67513ND
2017-01-30AD67479ND
2017-01-30AD67512ND
2017-01-30AD674818.90 ppb
2017-04-20AD80344ND
2017-04-20AD80338ND
2017-04-20AD80341ND
2017-04-20AD803405.00 ppb
2017-08-16AD93375ND
2017-08-16AD933849.50 ppb
2017-08-16AD93373ND
2017-08-16AD93374ND
2017-12-08AE074011.80 ppb
2017-12-08AE074021.80 ppb
2017-12-08AE074031.90 ppb
2017-12-08AE074048.00 ppb
2018-01-26AE109531.70 ppb
2018-01-26AE109501.20 ppb
2018-01-26AE109512.10 ppb
2018-01-26AE109527.10 ppb
2018-04-18AE229886.80 ppb
2018-04-18AE22991ND
2018-04-18AE22990ND
2018-04-18AE22992ND
2018-08-16AE37354ND
2018-08-16AE373511.000 ppb
2018-08-16AE37352ND
2018-08-16AE373538.20 ppb
2018-10-03AE42520ND
2018-10-03AE42545ND
2018-10-03AE42527ND
2018-10-03AE4251320.6 ppb
2019-02-05AE528552.30 ppb
2019-02-05AE5285355.0 ppb
2019-02-05AE52870ND
2019-02-05AE528761.50 ppb
2019-04-11AE620052.40 ppb
2019-04-11AE619952.20 ppb
2019-04-11AE620231.10 ppb
2019-04-11AE619986.70 ppb
2019-08-01AE767651.10 ppb
2019-08-01AE767631.30 ppb
2019-08-01AE767621.40 ppb
2019-08-01AE767611.80 ppb
2019-10-15AE866157.10 ppb
2019-10-15AE86618ND
2019-10-15AE866141.10 ppb
2019-10-15AE866161.40 ppb