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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Honolulu-Windward-Pearl Harbor

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

 

120

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND200ND
2015ND200ND
2016ND200ND
2017ND200ND
2018ND200ND
2019ND200ND

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
2014-03-10201403120665ND
2014-03-10201403120662ND
2014-03-11201403130592ND
2014-03-11201403130593ND
2014-03-11201403130590ND
2014-06-02201406040807ND
2014-06-02201406040811ND
2014-06-03201406070101ND
2014-06-03201406070096ND
2014-06-03201406070100ND
2014-09-09201409120804ND
2014-09-10201409120798ND
2014-09-10201409120807ND
2014-09-10201409120809ND
2014-09-10201409120799ND
2014-12-01201412040364ND
2014-12-02201412040386ND
2014-12-02201412040387ND
2014-12-03201412050323ND
2014-12-03201412050322ND
2015-01-06201501080393ND
2015-01-06201501080394ND
2015-01-06201501080400ND
2015-01-06201501080403ND
2015-01-13201501150585ND
2015-04-01201504030244ND
2015-04-06201504080295ND
2015-04-06201504080296ND
2015-04-08201504100159ND
2015-04-08201504100160ND
2015-07-07201507080163ND
2015-07-09201507100111ND
2015-07-09201507100112ND
2015-07-13201507150580ND
2015-07-13201507150581ND
2015-10-05201510070194ND
2015-10-05201510070196ND
2015-10-06201509160111ND
2015-10-06201509160112ND
2015-10-07201509160110ND
2016-01-05ND
2016-01-06ND
2016-01-12ND
2016-01-12ND
2016-01-12ND
2016-04-11ND
2016-04-11ND
2016-04-11ND
2016-04-13ND
2016-04-19ND
2016-07-05ND
2016-07-05ND
2016-07-05ND
2016-07-06ND
2016-07-11ND
2016-10-03ND
2016-10-04ND
2016-10-05ND
2016-10-14ND
2016-10-14ND
2017-01-03ND
2017-01-03ND
2017-01-03ND
2017-01-17ND
2017-01-23ND
2017-04-03ND
2017-04-03ND
2017-04-05ND
2017-04-05ND
2017-04-10ND
2017-07-03ND
2017-07-10ND
2017-07-10ND
2017-07-10ND
2017-07-10ND
2017-10-03ND
2017-10-03ND
2017-10-03ND
2017-10-03ND
2017-10-05ND
2018-01-08201801030078ND
2018-01-10201801030076ND
2018-01-10201801030077ND
2018-01-11201801030079ND
2018-01-11201801030080ND
2018-04-02201804040969ND
2018-04-02201804040979ND
2018-04-02201804040974ND
2018-04-02201804040975ND
2018-04-04201804090280ND
2018-07-06201807111056ND
2018-07-06201807111057ND
2018-07-06201807111058ND
2018-07-06201807111061ND
2018-07-10201807050038ND
2018-10-02201807050040ND
2018-10-05201810090641ND
2018-10-05201810090642ND
2018-10-09201810110602ND
2018-10-12201807050041ND
2019-01-14201901160463ND
2019-01-14201901160462ND
2019-01-17201901180118ND
2019-01-17201901180120ND
2019-01-17201901180121ND
2019-04-01201904040188ND
2019-04-01201904040187ND
2019-04-03201904050203ND
2019-04-03201904050205ND
2019-04-03201904050206ND
2019-07-08201907100476ND
2019-07-08201907100477ND
2019-07-09201907110399ND
2019-07-29201907300311ND
2019-07-29201907300310ND
2019-10-04201910080598ND
2019-10-07201910090552ND
2019-10-07201910090584ND
2019-10-07201910090585ND
2019-10-08201910100815ND