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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Suez Water Delaware

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

 

162

Samples

6

Samples exceeding legal limit (MCL)

162

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201427.8 ppb31315.90 ppb - 69.8 ppb
201538.9 ppb313115.8 ppb - 71.1 ppb
201626.1 ppb24245.70 ppb - 52.3 ppb
201724.3 ppb28288.90 ppb - 56.8 ppb
201825.9 ppb323210.2 ppb - 49.8 ppb
201918.0 ppb16168.19 ppb - 30.0 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
2014-03-061074953001A21.8 ppb
2014-03-061074953002A11.8 ppb
2014-03-061074953003A15.6 ppb
2014-03-061074953004A21.6 ppb
2014-03-061074953005A23.0 ppb
2014-03-061074953006A14.2 ppb
2014-03-061074953007A8.40 ppb
2014-03-061074953008A13.2 ppb
2014-06-112013111001 HAA519.7 ppb
2014-06-112013111002 HAA515.0 ppb
2014-06-112013111003 HAA539.2 ppb
2014-06-112013111004 HAA515.6 ppb
2014-06-112013111005 HAA517.6 ppb
2014-06-112013111006 HAA531.4 ppb
2014-06-112013111007 HAA535.3 ppb
2014-06-112013111008 HAA540.6 ppb
2014-09-09202898300-1HAA526.1 ppb
2014-09-092028983002-HAA559.5 ppb
2014-09-092028983003-HAA553.6 ppb
2014-09-092028983005-HAA564.2 ppb
2014-09-092028983006-HAA563.8 ppb
2014-09-092028983007-HAA542.4 ppb
2014-09-092028983008-HAA569.8 ppb
2014-12-182045252001-HAA530.4 ppb
2014-12-182046252002-HAA514.4 ppb
2014-12-182046252003-HAA519.0 ppb
2014-12-182046252004-HAA524.8 ppb
2014-12-182046252005-HAA517.0 ppb
2014-12-182046252006-HAA56.70 ppb
2014-12-182046252007-HAA55.90 ppb
2014-12-182046252008-HAA520.1 ppb
2015-03-112059081001 HAA541.7 ppb
2015-03-112059081002 HAA532.0 ppb
2015-03-112059081003 HAA538.4 ppb
2015-03-112059081004 HAA529.3 ppb
2015-03-112059081005 HAA560.1 ppb
2015-03-112059081006 HAA541.7 ppb
2015-03-112059081007 HAA570.4 ppb
2015-03-112059081008 HAA553.7 ppb
2015-06-082075686001 HAA571.1 ppb
2015-06-082075686002 HAA555.0 ppb
2015-06-082075686003 HAA544.8 ppb
2015-06-082075686004 HAA544.7 ppb
2015-06-082075686005 HAA552.5 ppb
2015-06-082075686006 HAA549.8 ppb
2015-06-082075686007 HAAT40.7 ppb
2015-06-082075686008 HAA550.0 ppb
2015-09-03203960002 HAA522.4 ppb
2015-09-032093960003 HAA515.8 ppb
2015-09-032093960004 HAA520.5 ppb
2015-09-032093960005 HAA523.4 ppb
2015-09-032093960006 HAA527.6 ppb
2015-09-032093960007 HAA517.4 ppb
2015-09-032093960008 HAA517.7 ppb
2015-12-07L5949833-1 HAA542.0 ppb
2015-12-07L5949833-2 HAA530.8 ppb
2015-12-07L5949833-3 HAA528.2 ppb
2015-12-07L5949833-4 HAA541.4 ppb
2015-12-07L5949833-5 HAA553.2 ppb
2015-12-07L5949833-6 HAA532.9 ppb
2015-12-07L5949833-7 HAA532.9 ppb
2015-12-07L5949833-8 HAA523.2 ppb
2016-06-102151332001 HAA552.3 ppb
2016-06-102151332002 HAA536.3 ppb
2016-06-102151332003 HAA530.6 ppb
2016-06-102151332004 HAA520.7 ppb
2016-06-102151332005 HAA537.2 ppb
2016-06-102151332006 HAA537.0 ppb
2016-06-102151332007 HAA526.9 ppb
2016-06-102151332008 HAA535.1 ppb
2016-09-082173721001-HAA523.0 ppb
2016-09-082173721002-HAA519.7 ppb
2016-09-082173721003-HAA517.2 ppb
2016-09-082173721004-HAA510.4 ppb
2016-09-082173721005-HAA526.5 ppb
2016-09-082173721006-HAA521.5 ppb
2016-09-082173721007-HAA516.6 ppb
2016-09-082173721008-HAA517.9 ppb
2016-12-082194964001 HAA533.4 ppb
2016-12-082194964002 HAA523.1 ppb
2016-12-082194964003 HAA521.2 ppb
2016-12-082194964004 HAA55.70 ppb
2016-12-082194964005 HAA529.3 ppb
2016-12-082194964006 HAA539.6 ppb
2016-12-082194964007 HAA521.4 ppb
2016-12-082194964008 HAA522.7 ppb
2017-03-082214632001 HAA521.7 ppb
2017-03-082214632002 HAA510.2 ppb
2017-03-082214632003 HAA510.4 ppb
2017-03-082214632004 HAA514.8 ppb
2017-03-082214632005 HAA516.4 ppb
2017-03-082214632006 HAA521.2 ppb
2017-03-082214632007 HAA58.90 ppb
2017-03-082214632008 HAA510.3 ppb
2017-06-092239424001 HAA529.4 ppb
2017-06-092239424002 HAA525.5 ppb
2017-06-092239424003 HAA522.2 ppb
2017-06-092239424004 HAA513.4 ppb
2017-06-092239424005 HAA530.7 ppb
2017-06-092239424006 HAA527.4 ppb
2017-06-092239424007 HAA522.3 ppb
2017-06-092239424008 HAA522.8 ppb
2017-09-072260181001 HAA555.5 ppb
2017-09-072260181002 HAA556.8 ppb
2017-09-072260181003 HAA540.7 ppb
2017-09-072260181004 HAA514.8 ppb
2017-09-072260181005 HAA545.4 ppb
2017-09-072260181006 HAA533.2 ppb
2017-09-072260181008 HAA539.2 ppb
2017-12-072282095001 HAA512.5 ppb
2017-12-072282095002 HAA518.1 ppb
2017-12-072282095003 HAA526.4 ppb
2017-12-072282095004 HAA515.1 ppb
2017-12-072282095005 HAA516.2 ppb
2018-03-082300879001 HAA510.3 ppb
2018-03-082300879002 HAA518.6 ppb
2018-03-082300879003 HAA518.2 ppb
2018-03-082300879004 HAA529.8 ppb
2018-03-082300879005 HAA512.8 ppb
2018-03-082300879006 HAA510.2 ppb
2018-03-082300879007 HAA523.3 ppb
2018-03-082300879008 HAA529.5 ppb
2018-06-072319771001 HAA532.7 ppb
2018-06-072319771002 HAA544.3 ppb
2018-06-072319771003 HAA525.1 ppb
2018-06-072319771004 HAA549.8 ppb
2018-06-072319771005 HAA544.6 ppb
2018-06-072319771006 HAA535.5 ppb
2018-06-072319771007 HAA518.9 ppb
2018-06-072319771008 HAA526.9 ppb
2018-09-078092132-01 HAA548.2 ppb
2018-09-078092132-02 HAA535.2 ppb
2018-09-078092132-03 HAA512.2 ppb
2018-09-078092132-04 HAA532.6 ppb
2018-09-078092132-05 HAA514.5 ppb
2018-09-078092132-06 HAA546.5 ppb
2018-09-078092132-07 HAA535.1 ppb
2018-09-078092132-08 HAA533.8 ppb
2018-12-078122169-01 HAA519.0 ppb
2018-12-078122169-02 HAA513.8 ppb
2018-12-078122169-03 HAA512.4 ppb
2018-12-078122169-04 HAA514.3 ppb
2018-12-078122169-05 HAA532.2 ppb
2018-12-078122169-06 HAA516.4 ppb
2018-12-078122169-07 HAA518.4 ppb
2018-12-078122169-08 HAA513.3 ppb
2019-06-079062657-01 HAA530.0 ppb
2019-06-079062657-02 HAA520.7 ppb
2019-06-079062657-03 HAA516.7 ppb
2019-06-079062657-04 HAA528.0 ppb
2019-06-079062657-05 HAA518.1 ppb
2019-06-079062657-06 HAA521.1 ppb
2019-06-079062657-07 HAA515.9 ppb
2019-06-079062657-08 HAA517.2 ppb
2019-12-099122414-01 HAA525.5 ppb
2019-12-099122414-02 HAA512.1 ppb
2019-12-099122414-03 HAA59.22 ppb
2019-12-099122414-04 HAA510.4 ppb
2019-12-099122414-05 HAA523.5 ppb
2019-12-099122414-06 HAA58.19 ppb
2019-12-099122414-07 HAA514.5 ppb
2019-12-099122414-08 HAA517.1 ppb