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EWG's Tap Water Database — 2019 UPDATE

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Haloacetic acids (HAA5)

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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.

 

190

Samples

0

Samples exceeding legal limit (MCL)

159

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201218.6 ppb3225ND - 38.0 ppb
201315.8 ppb3226ND - 37.0 ppb
201419.8 ppb3019ND - 48.6 ppb
201522.0 ppb3226ND - 60.0 ppb
201619.8 ppb3231ND - 35.9 ppb
201723.9 ppb32322.10 ppb - 45.9 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 on-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
2012-02-13D120432322.9 ppb
2012-02-13D120432412.4 ppb
2012-02-13D1204325ND
2012-02-13D1204321ND
2012-02-13D1204317ND
2012-02-13D1204315ND
2012-02-14D1204461ND
2012-02-14D1204462ND
2012-06-11D12169674.50 ppb
2012-06-11D121696618.8 ppb
2012-06-12D121720229.2 ppb
2012-06-12D121720121.1 ppb
2012-06-12D121720036.4 ppb
2012-06-12D121719929.5 ppb
2012-06-12D121719820.1 ppb
2012-06-13D121735223.9 ppb
2012-09-10D122816920.0 ppb
2012-09-10D1228168ND
2012-09-10D122816722.0 ppb
2012-09-10D122816615.0 ppb
2012-09-11D122832736.0 ppb
2012-09-11D122833028.0 ppb
2012-09-11D122832930.0 ppb
2012-09-11D122832834.0 ppb
2012-12-10D123830023.0 ppb
2012-12-10D123829921.0 ppb
2012-12-10D123829825.0 ppb
2012-12-10D123829721.0 ppb
2012-12-11D123851022.0 ppb
2012-12-11D123850715.0 ppb
2012-12-11D123850927.0 ppb
2012-12-11D123850838.0 ppb
2013-03-11D131032528.0 ppb
2013-03-11D1310326ND
2013-03-11D131032437.0 ppb
2013-03-14D131101114.0 ppb
2013-03-14D1311012ND
2013-03-14D131101311.0 ppb
2013-03-14D131101415.0 ppb
2013-03-14D1311015ND
2013-06-13D132551522.0 ppb
2013-06-13D1325514ND
2013-06-13D132551327.0 ppb
2013-06-13D132551226.0 ppb
2013-06-14D132558823.0 ppb
2013-06-14D1325589ND
2013-06-14D132559011.0 ppb
2013-06-14D132558724.0 ppb
2013-09-09D133878522.0 ppb
2013-09-10D133914618.0 ppb
2013-09-10D133914522.0 ppb
2013-09-10D133914417.0 ppb
2013-09-10D133914313.0 ppb
2013-09-10D133914913.0 ppb
2013-09-10D133914824.0 ppb
2013-09-10D133914722.0 ppb
2013-12-11D135211210.2 ppb
2013-12-11D135211516.5 ppb
2013-12-11D135211615.7 ppb
2013-12-11D135211719.1 ppb
2013-12-11D1352118ND
2013-12-11D135211914.6 ppb
2013-12-11D135211415.5 ppb
2013-12-11D135211323.9 ppb
2014-03-11D1408706ND
2014-03-11D1408705ND
2014-03-11D1408704ND
2014-03-12D1408902ND
2014-03-12D1408901ND
2014-03-12D1408900ND
2014-03-12D1408899ND
2014-06-09D142078048.3 ppb
2014-06-09D142077548.6 ppb
2014-06-09D142077323.9 ppb
2014-06-10D1421079ND
2014-06-10D142107839.0 ppb
2014-06-10D142107732.0 ppb
2014-06-10D142107631.1 ppb
2014-06-12D142150032.1 ppb
2014-09-08D143523115.2 ppb
2014-09-08D143523022.3 ppb
2014-09-08D143522938.7 ppb
2014-09-08D143522838.5 ppb
2014-09-09D143550730.2 ppb
2014-09-09D1435506ND
2014-09-09D143550542.5 ppb
2014-09-09D143550425.1 ppb
2014-12-08D144821218.8 ppb
2014-12-08D144821434.7 ppb
2014-12-08D1448213ND
2014-12-09D144837019.2 ppb
2014-12-09D1448369ND
2014-12-09D144836820.2 ppb
2014-12-09D144836733.9 ppb
2015-03-09D150887221.9 ppb
2015-03-09D1508871ND
2015-03-09D150887011.8 ppb
2015-03-09D150886960.0 ppb
2015-03-09D150886860.0 ppb
2015-03-09D1508864ND
2015-03-09D1508863ND
2015-03-12D1509546ND
2015-06-09D152252525.0 ppb
2015-06-09D152252432.2 ppb
2015-06-09D152252334.3 ppb
2015-06-09D152252227.5 ppb
2015-06-09D152252114.0 ppb
2015-06-09D152252032.1 ppb
2015-06-09D152251938.1 ppb
2015-06-09D152251816.9 ppb
2015-09-09D153844335.0 ppb
2015-09-09D153844420.9 ppb
2015-09-09D153844520.4 ppb
2015-09-10D153863460.0 ppb
2015-09-10D153863223.0 ppb
2015-09-10D153863327.6 ppb
2015-09-10D153863516.5 ppb
2015-09-11D153895918.4 ppb
2015-12-07D155239816.7 ppb
2015-12-07D155239718.9 ppb
2015-12-07D155239623.3 ppb
2015-12-07D155239521.5 ppb
2015-12-07D1552394ND
2015-12-07D155239311.6 ppb
2015-12-07D1552392ND
2015-12-11D155315716.3 ppb
2016-03-09D16097729.00 ppb
2016-03-09D160977113.1 ppb
2016-03-09D160977028.7 ppb
2016-03-09D160976913.0 ppb
2016-03-11D1610105ND
2016-03-11D16101047.87 ppb
2016-03-11D161010311.5 ppb
2016-03-11D16101064.35 ppb
2016-06-14D162575733.2 ppb
2016-06-14D162575634.4 ppb
2016-06-14D162575528.0 ppb
2016-06-14D162575434.8 ppb
2016-06-14D162575318.2 ppb
2016-06-14D162575234.6 ppb
2016-06-14D162575135.9 ppb
2016-06-14D162575019.3 ppb
2016-09-19D164282314.4 ppb
2016-09-19D164282428.0 ppb
2016-09-19D164282519.1 ppb
2016-09-19D164282627.8 ppb
2016-09-20D164317114.4 ppb
2016-09-20D164317227.1 ppb
2016-09-20D164317326.4 ppb
2016-09-20D164317425.7 ppb
2016-12-13D165667513.8 ppb
2016-12-13D165667633.6 ppb
2016-12-13D165667735.3 ppb
2016-12-13D16566787.89 ppb
2016-12-13D165667912.2 ppb
2016-12-13D165668012.4 ppb
2016-12-13D16566814.79 ppb
2016-12-13D16566825.55 ppb
2017-03-13D170990411.0 ppb
2017-03-13D170990334.3 ppb
2017-03-13D170990228.9 ppb
2017-03-13D170990120.7 ppb
2017-03-13D170989812.1 ppb
2017-03-13D17098979.57 ppb
2017-03-13D17098962.10 ppb
2017-03-13D17098952.47 ppb
2017-06-13D172509124.3 ppb
2017-06-13D172509828.3 ppb
2017-06-13D172509729.3 ppb
2017-06-13D172509639.0 ppb
2017-06-13D172509521.0 ppb
2017-06-13D172509422.3 ppb
2017-06-13D172509316.8 ppb
2017-06-13D172509216.0 ppb
2017-09-11D174148025.0 ppb
2017-09-11D174147935.0 ppb
2017-09-11D174147823.3 ppb
2017-09-11D174147733.5 ppb
2017-09-11D174147634.3 ppb
2017-09-11D174147545.9 ppb
2017-09-11D174147421.3 ppb
2017-09-14D174215725.1 ppb
2017-12-11D175740124.2 ppb
2017-12-12D175757625.4 ppb
2017-12-12D175757518.3 ppb
2017-12-12D175757422.1 ppb
2017-12-12D175757334.7 ppb
2017-12-12D175757238.4 ppb
2017-12-12D175757116.9 ppb
2017-12-12D175757723.9 ppb