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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

City of Hewitt

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)

67

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20146.98 ppb1614ND - 16.9 ppb
20157.94 ppb1614ND - 28.7 ppb
20162.66 ppb168ND - 16.4 ppb
20172.74 ppb1612ND - 11.6 ppb
20183.30 ppb1610ND - 11.0 ppb
20194.21 ppb169ND - 15.9 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
2014-03-13AC4692116.3 ppb
2014-03-13AC4694010.3 ppb
2014-03-13AC4691816.9 ppb
2014-03-13AC469198.10 ppb
2014-04-17AC510465.40 ppb
2014-04-17AC510479.70 ppb
2014-04-17AC5105210.8 ppb
2014-04-17AC5104810.8 ppb
2014-09-15AC67011ND
2014-09-15AC670161.70 ppb
2014-09-15AC670151.60 ppb
2014-09-15AC670201.70 ppb
2014-11-18AC7239612.2 ppb
2014-11-18AC723944.90 ppb
2014-11-18AC72390ND
2014-11-18AC723981.20 ppb
2015-03-23AC854838.50 ppb
2015-03-23AC854819.70 ppb
2015-03-23AC85480ND
2015-03-23AC854793.90 ppb
2015-04-21AC890081.60 ppb
2015-04-21AC89006ND
2015-04-21AC890143.40 ppb
2015-04-21AC890054.20 ppb
2015-07-15AC996292.80 ppb
2015-07-15AC996301.70 ppb
2015-07-15AC9963428.7 ppb
2015-07-15AC9963317.6 ppb
2015-10-28AD119771.30 ppb
2015-10-28AD1197513.6 ppb
2015-10-28AD1197815.6 ppb
2015-10-28AD1197414.5 ppb
2016-01-20AD189221.90 ppb
2016-01-20AD18923ND
2016-01-20AD18926ND
2016-01-20AD1892410.1 ppb
2016-04-06AD3206316.4 ppb
2016-04-06AD32064ND
2016-04-06AD32068ND
2016-04-06AD32062ND
2016-07-13AD440681.90 ppb
2016-07-13AD440663.00 ppb
2016-07-13AD440694.30 ppb
2016-07-13AD440614.00 ppb
2016-10-12AD53151ND
2016-10-12AD531431.000 ppb
2016-10-12AD53144ND
2016-10-12AD53138ND
2017-02-06AD691642.00 ppb
2017-02-06AD69165ND
2017-02-06AD6916611.6 ppb
2017-02-06AD69162ND
2017-04-03AD780161.20 ppb
2017-04-03AD780171.20 ppb
2017-04-03AD780181.70 ppb
2017-04-03AD78015ND
2017-07-19AD899226.60 ppb
2017-07-19AD899216.40 ppb
2017-07-19AD899264.30 ppb
2017-07-19AD89928ND
2017-10-09AD997471.30 ppb
2017-10-09AD997441.30 ppb
2017-10-09AD997415.00 ppb
2017-10-09AD997461.20 ppb
2018-02-07AE127323.40 ppb
2018-02-07AE12740ND
2018-02-07AE12733ND
2018-02-07AE12741ND
2018-04-19AE232054.50 ppb
2018-04-19AE232066.30 ppb
2018-04-19AE2321211.0 ppb
2018-04-19AE232145.70 ppb
2018-08-15AE37157ND
2018-08-15AE371701.50 ppb
2018-08-15AE371728.70 ppb
2018-08-15AE371746.20 ppb
2018-11-06AE45351ND
2018-11-06AE45349ND
2018-11-06AE453484.40 ppb
2018-11-06AE453521.10 ppb
2019-02-12AE540255.30 ppb
2019-02-12AE54027ND
2019-02-12AE54023ND
2019-02-12AE54029ND
2019-04-22AE63135ND
2019-04-22AE63141ND
2019-04-22AE63138ND
2019-04-22AE63139ND
2019-08-26AE805221.20 ppb
2019-08-26AE8051811.2 ppb
2019-08-26AE805212.80 ppb
2019-08-26AE8051912.3 ppb
2019-10-17AE8688215.9 ppb
2019-10-17AE868875.10 ppb
2019-10-17AE868806.90 ppb
2019-10-17AE868836.60 ppb