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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Regional Water Authority

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

 

288

Samples

12

Samples exceeding legal limit (MCL)

287

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201437.0 ppb484812.0 ppb - 57.8 ppb
201530.6 ppb484810.6 ppb - 45.9 ppb
201638.0 ppb4847ND - 72.9 ppb
201740.7 ppb48486.00 ppb - 62.5 ppb
201843.5 ppb484814.1 ppb - 70.6 ppb
201929.5 ppb484818.3 ppb - 44.3 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
2014-03-04DBP 20039195434.7 ppb
2014-03-04DBP 20039195935.7 ppb
2014-03-04DBP 20039197439.3 ppb
2014-03-05DBP 20039209242.2 ppb
2014-03-05DBP 20039209338.9 ppb
2014-03-05DBP 20039209423.1 ppb
2014-03-06DBP 20039215215.1 ppb
2014-03-06DBP 20039220143.0 ppb
2014-03-06DBP 20039220234.1 ppb
2014-03-07DBP 20039230631.7 ppb
2014-03-07DBP 20039230738.8 ppb
2014-03-07DBP 20039230847.3 ppb
2014-06-02DBP 20039694850.1 ppb
2014-06-02DBP 20039694947.8 ppb
2014-06-02DBP 20039695023.2 ppb
2014-06-03DBP 20039695938.6 ppb
2014-06-03DBP 20039696439.4 ppb
2014-06-03DBP 20039698243.2 ppb
2014-06-03DBP 20039707337.8 ppb
2014-06-05DBP 20039722919.9 ppb
2014-06-05DBP 20039732744.3 ppb
2014-06-05DBP 20039732857.8 ppb
2014-06-06DBP 20039735452.1 ppb
2014-06-06DBP 20039735553.6 ppb
2014-09-02DBP 20040327234.9 ppb
2014-09-02DBP 20040327741.9 ppb
2014-09-02DBP 20040330239.9 ppb
2014-09-03DBP 20040347047.5 ppb
2014-09-03DBP 20040347137.0 ppb
2014-09-03DBP 20040347233.8 ppb
2014-09-04DBP 20040351718.4 ppb
2014-09-04DBP 20040355640.9 ppb
2014-09-04DBP 20040355742.1 ppb
2014-09-04DBP 20040355846.9 ppb
2014-09-06DBP 20040368712.0 ppb
2014-09-06DBP 20040368834.3 ppb
2014-12-02DBP 20040868330.7 ppb
2014-12-02DBP 20040868833.6 ppb
2014-12-02DBP 20040870638.8 ppb
2014-12-02DBP 20040874841.9 ppb
2014-12-02DBP 20040874945.9 ppb
2014-12-02DBP 20040875025.7 ppb
2014-12-03DBP 20040885612.2 ppb
2014-12-03DBP 20040885749.6 ppb
2014-12-04DBP 20040894614.4 ppb
2014-12-04DBP 20040896838.7 ppb
2014-12-04DBP 20040896943.8 ppb
2014-12-04DBP 20040897039.1 ppb
2015-03-02DBP 20041285031.0 ppb
2015-03-02DBP 20041285138.2 ppb
2015-03-03DBP 20041292932.7 ppb
2015-03-03DBP 20041292832.1 ppb
2015-03-03DBP 20041287027.9 ppb
2015-03-03DBP 20041286323.7 ppb
2015-03-03DBP 20041288344.4 ppb
2015-03-04DBP 20041305119.5 ppb
2015-03-05DBP 20041315437.1 ppb
2015-03-05DBP 20041315636.7 ppb
2015-03-05DBP 20041313021.7 ppb
2015-03-05DBP 20041315537.5 ppb
2015-06-01DBP 20041756317.9 ppb
2015-06-01DBP 20041760328.2 ppb
2015-06-01DBP 20041760433.9 ppb
2015-06-01DBP 20041759534.8 ppb
2015-06-01DBP 20041760232.2 ppb
2015-06-01DBP 20041760535.2 ppb
2015-06-02DBP 20041769934.7 ppb
2015-06-02DBP 20041770135.3 ppb
2015-06-02DBP 20041762931.8 ppb
2015-06-02DBP 20041762429.7 ppb
2015-06-03DBP 20041782320.4 ppb
2015-06-03DBP 20041781931.3 ppb
2015-09-01DBP 20042386834.4 ppb
2015-09-01DBP 20042386640.4 ppb
2015-09-01DBP 20042382113.8 ppb
2015-09-01DBP 20042381229.9 ppb
2015-09-01DBP 20042380732.0 ppb
2015-09-01DBP 20042382932.3 ppb
2015-09-01DBP 20042386745.9 ppb
2015-09-01DBP 20042386943.4 ppb
2015-09-02DBP 20042408034.1 ppb
2015-09-02DBP 20042408235.6 ppb
2015-09-02DBP 20042408139.5 ppb
2015-09-04DBP 20042427111.3 ppb
2015-12-01DBP 20042954120.4 ppb
2015-12-01DBP 20042960427.6 ppb
2015-12-01DBP 20042955625.9 ppb
2015-12-01DBP 20042960233.2 ppb
2015-12-01DBP 20042954628.5 ppb
2015-12-01DBP 20042960132.8 ppb
2015-12-02DBP 20042972512.8 ppb
2015-12-02DBP 20042975110.6 ppb
2015-12-02DBP 20042975236.0 ppb
2015-12-03DBP 20042987731.0 ppb
2015-12-03DBP 20042987527.9 ppb
2015-12-03DBP 20042987643.1 ppb
2016-03-01DBP 20043442027.0 ppb
2016-03-01DBP 20043443225.5 ppb
2016-03-01DBP 20043443927.6 ppb
2016-03-01DBP 20043451835.0 ppb
2016-03-02DBP 20043465230.3 ppb
2016-03-02DBP 20043465335.1 ppb
2016-03-03DBP 20043470519.3 ppb
2016-03-03DBP 20043473421.2 ppb
2016-03-03DBP 20043479033.7 ppb
2016-03-03DBP 20043479132.2 ppb
2016-03-04DBP 20043481936.6 ppb
2016-03-04DBP 20043482034.0 ppb
2016-06-01DBP 20044102534.0 ppb
2016-06-01DBP 20044102643.5 ppb
2016-06-01DBP 20044103743.1 ppb
2016-06-01DBP 20044105452.8 ppb
2016-06-01DBP 20044105549.8 ppb
2016-06-01DBP 20044105630.0 ppb
2016-06-01DBP 20044105718.0 ppb
2016-06-01DBP 20044105840.1 ppb
2016-06-02DBP 20044126216.8 ppb
2016-06-02DBP 20044129747.4 ppb
2016-06-02DBP 20044129850.5 ppb
2016-06-02DBP 20044129939.8 ppb
2016-09-06DBP 20044896953.3 ppb
2016-09-06DBP 20044897448.6 ppb
2016-09-06DBP 20044900162.2 ppb
2016-09-06DBP 20044901450.0 ppb
2016-09-06DBP 20044901559.1 ppb
2016-09-06DBP 20044901672.9 ppb
2016-09-07DBP 20044921451.4 ppb
2016-09-08DBP 20044940767.1 ppb
2016-09-08DBP 20044940863.3 ppb
2016-09-09DBP 20044950059.3 ppb
2016-09-12DBP 20044954519.1 ppb
2016-09-12DBP 20044954711.7 ppb
2016-12-05DBP 20045608127.8 ppb
2016-12-05DBP 20045608342.5 ppb
2016-12-06DBP 20045608840.3 ppb
2016-12-06DBP 20045611035.9 ppb
2016-12-06DBP 20045611535.2 ppb
2016-12-06DBP 20045617546.2 ppb
2016-12-07DBP 2004563585.10 ppb
2016-12-07DBP 20045635944.8 ppb
2016-12-08DBP 200456453ND
2016-12-08DBP 20045646045.2 ppb
2016-12-08DBP 20045646138.5 ppb
2016-12-08DBP 20045646221.5 ppb
2017-03-01DBP 20046149644.3 ppb
2017-03-01DBP 20046154243.1 ppb
2017-03-01DBP 20046154352.5 ppb
2017-03-01DBP 20046154442.2 ppb
2017-03-01DBP 20046154554.0 ppb
2017-03-01DBP 20046154638.0 ppb
2017-03-02DBP 20046165040.8 ppb
2017-03-02DBP 20046165145.8 ppb
2017-03-02DBP 20046167356.1 ppb
2017-03-02DBP 20046167452.4 ppb
2017-03-02DBP 20046167515.8 ppb
2017-03-03DBP 20046172711.9 ppb
2017-06-05DBP 20046842030.5 ppb
2017-06-05DBP 20046842146.0 ppb
2017-06-06DBP 20046847634.7 ppb
2017-06-06DBP 20046848135.1 ppb
2017-06-06DBP 20046850044.5 ppb
2017-06-07DBP 20046866926.6 ppb
2017-06-07DBP 20046867042.9 ppb
2017-06-08DBP 20046885018.5 ppb
2017-06-08DBP 20046894645.3 ppb
2017-06-08DBP 20046894748.2 ppb
2017-06-08DBP 20046894836.7 ppb
2017-06-08DBP 20046894930.2 ppb
2017-09-05DBP 20047578548.4 ppb
2017-09-05DBP 20047579045.3 ppb
2017-09-05DBP 20047580058.1 ppb
2017-09-07DBP 2004761049.70 ppb
2017-09-07DBP 20047622062.5 ppb
2017-09-07DBP 20047622154.8 ppb
2017-09-07DBP 20047622255.5 ppb
2017-09-07DBP 20047622450.1 ppb
2017-09-08DBP 20047630249.3 ppb
2017-09-08DBP 20047630443.4 ppb
2017-09-08DBP 20047630543.3 ppb
2017-09-08DBP 2004763066.00 ppb
2017-12-05DBP 20048337640.0 ppb
2017-12-05DBP 20048338139.7 ppb
2017-12-05DBP 20048339153.1 ppb
2017-12-07DBP 20048377042.9 ppb
2017-12-07DBP 20048377145.7 ppb
2017-12-07DBP 20048377241.8 ppb
2017-12-07DBP 20048377318.1 ppb
2017-12-07DBP 20048377459.3 ppb
2017-12-08DBP 20048383420.4 ppb
2017-12-08DBP 20048384339.1 ppb
2017-12-08DBP 20048384448.5 ppb
2017-12-08DBP 20048384544.6 ppb
2018-03-06DBP 20048926857.5 ppb
2018-03-06DBP 20048927570.6 ppb
2018-03-06DBP 20048928762.5 ppb
2018-03-07DBP 20048953735.2 ppb
2018-03-07DBP 20048953862.8 ppb
2018-03-07DBP 20048953967.5 ppb
2018-03-07DBP 20048954065.3 ppb
2018-03-07DBP 20048954155.4 ppb
2018-03-08DBP 20048956527.2 ppb
2018-03-09DBP 20048970165.5 ppb
2018-03-09DBP 20048970269.7 ppb
2018-03-09DBP 20048970347.3 ppb
2018-06-05DBP 20049598439.8 ppb
2018-06-05DBP 20049598942.8 ppb
2018-06-05DBP 20049600244.4 ppb
2018-06-06DBP 20049623541.3 ppb
2018-06-07DBP 20049637538.7 ppb
2018-06-07DBP 20049637647.2 ppb
2018-06-07DBP 20049641733.6 ppb
2018-06-08DBP 20049650748.7 ppb
2018-06-08DBP 20049650844.5 ppb
2018-06-08DBP 20049650949.3 ppb
2018-06-08DBP 20049651053.1 ppb
2018-06-08DBP 20049651144.9 ppb
2018-09-04DBP 20050373239.8 ppb
2018-09-04DBP 20050373729.3 ppb
2018-09-04DBP 20050384234.3 ppb
2018-09-04DBP 20050391236.4 ppb
2018-09-04DBP 20050391338.2 ppb
2018-09-04DBP 20050391441.4 ppb
2018-09-05DBP 20050398139.0 ppb
2018-09-05DBP 20050408634.8 ppb
2018-09-05DBP 20050408718.3 ppb
2018-09-06DBP 20050418514.1 ppb
2018-09-06DBP 20050421127.1 ppb
2018-09-07DBP 20050444142.3 ppb
2018-12-03DBP 20051437217.2 ppb
2018-12-03DBP 20051440639.9 ppb
2018-12-04DBP 20051444739.9 ppb
2018-12-04DBP 20051445243.8 ppb
2018-12-04DBP 20051462546.7 ppb
2018-12-04DBP 20051462641.9 ppb
2018-12-04DBP 20051462740.9 ppb
2018-12-04DBP 20051462838.5 ppb
2018-12-04DBP 20051462937.7 ppb
2018-12-05DBP 20051495240.9 ppb
2018-12-06DBP 20051506938.5 ppb
2018-12-06DBP 20051507050.7 ppb
2019-03-04DBP 20052321521.7 ppb
2019-03-04DBP 20052321729.3 ppb
2019-03-05DBP 20052326226.7 ppb
2019-03-05DBP 20052326929.3 ppb
2019-03-05DBP 20052345631.6 ppb
2019-03-05DBP 20052345744.3 ppb
2019-03-05DBP 20052345830.6 ppb
2019-03-05DBP 20052345928.6 ppb
2019-03-05DBP 20052346318.3 ppb
2019-03-07DBP 20052388429.1 ppb
2019-03-08DBP 20052400023.2 ppb
2019-03-08DBP 20052400234.1 ppb
2019-06-03DBP 20053437329.0 ppb
2019-06-03DBP 20053441425.7 ppb
2019-06-04DBP 20053449126.0 ppb
2019-06-04DBP 20053449627.5 ppb
2019-06-04DBP 20053460028.7 ppb
2019-06-04DBP 20053472528.3 ppb
2019-06-04DBP 20053472732.7 ppb
2019-06-04DBP 20053472938.5 ppb
2019-06-05DBP 20053503934.9 ppb
2019-06-05DBP 20053504128.7 ppb
2019-06-06DBP 20053519728.6 ppb
2019-06-07DBP 20053535727.6 ppb
2019-09-03DBP 20054698832.9 ppb
2019-09-03DBP 20054699322.0 ppb
2019-09-04DBP 20054740019.3 ppb
2019-09-04DBP 20054740232.8 ppb
2019-09-04DBP 20054740336.3 ppb
2019-09-04DBP 20054740432.5 ppb
2019-09-04DBP 20054740532.8 ppb
2019-09-05DBP 20054746023.2 ppb
2019-09-05DBP 20054766730.4 ppb
2019-09-06DBP 20054782635.2 ppb
2019-09-06DBP 20054782733.3 ppb
2019-09-06DBP 20054782835.9 ppb
2019-12-02DBP 20055840538.1 ppb
2019-12-02DBP 20055840630.1 ppb
2019-12-02DBP 20055840733.1 ppb
2019-12-03DBP 20055845427.9 ppb
2019-12-03DBP 20055845931.4 ppb
2019-12-03DBP 20055861230.3 ppb
2019-12-04DBP 20055891627.0 ppb
2019-12-04DBP 20055891728.5 ppb
2019-12-04DBP 20055891918.9 ppb
2019-12-05DBP 20055907329.1 ppb
2019-12-05DBP 20055909824.7 ppb
2019-12-06DBP 20055919527.2 ppb