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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Town of Boone

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

 

93

Samples

0

Samples exceeding legal limit (MCL)

93

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201417.8 ppb15158.00 ppb - 29.0 ppb
201520.1 ppb141411.0 ppb - 36.0 ppb
201624.0 ppb16166.00 ppb - 37.0 ppb
201724.3 ppb161612.0 ppb - 43.0 ppb
201825.1 ppb161611.0 ppb - 49.0 ppb
201924.0 ppb16165.50 ppb - 49.0 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
2014-02-0492188737002-215.0 ppb
2014-02-0492188737004-216.0 ppb
2014-02-0492188737001-214.0 ppb
2014-05-0692200307001DIS20.0 ppb
2014-05-0692200307002DIS16.2 ppb
2014-05-0692200307003DIS18.0 ppb
2014-05-0692200307001TTH23.0 ppb
2014-05-0692200307002TTH17.0 ppb
2014-05-0692200307003TTH19.0 ppb
2014-08-0592212154001TTH29.0 ppb
2014-08-0592212154002TTH21.0 ppb
2014-08-0592212154003TTH26.0 ppb
2014-11-1292225463002TTH8.00 ppb
2014-11-1292225463003TTH8.20 ppb
2014-11-1292225463001TTH17.0 ppb
2015-02-1015.0 ppb
2015-02-1011.0 ppb
2015-02-1015.0 ppb
2015-05-1214.0 ppb
2015-05-1214.0 ppb
2015-05-1219.0 ppb
2015-08-1125.0 ppb
2015-08-1136.0 ppb
2015-08-1130.0 ppb
2015-08-3118.0 ppb
2015-11-0928.0 ppb
2015-11-0911.0 ppb
2015-11-0915.0 ppb
2015-11-0931.0 ppb
2016-02-0892285721001TTH8.40 ppb
2016-02-0892285721002TTH6.00 ppb
2016-02-0892285721003TTH16.0 ppb
2016-02-0892285721004TTH9.10 ppb
2016-05-0392296315001TTH32.0 ppb
2016-05-0392296315002TTH27.0 ppb
2016-05-0392296315003TTH25.0 ppb
2016-05-0392296315004TTH24.0 ppb
2016-08-0292307720004TTH23.0 ppb
2016-08-0292307720003TTH30.0 ppb
2016-08-0292307720002TTH28.0 ppb
2016-08-0292307720001TTH30.0 ppb
2016-11-0392318558002TTH26.0 ppb
2016-11-0392318558004TTH26.0 ppb
2016-11-0392318558003TTH36.0 ppb
2016-11-0392318558001TTH37.0 ppb
2017-02-0892329381004TTH12.0 ppb
2017-02-0892329381003TTH20.0 ppb
2017-02-0892329381002TTH12.0 ppb
2017-02-0892329381001TTH20.0 ppb
2017-05-0392339477002TTH18.0 ppb
2017-05-0392339477003TTH30.0 ppb
2017-05-0392339477001TTH27.0 ppb
2017-05-0392339477004TTH18.0 ppb
2017-08-0892350885001TTH43.0 ppb
2017-08-0892350885002TTH32.0 ppb
2017-08-0892350885003TTH36.0 ppb
2017-08-0892350885004TTH28.0 ppb
2017-11-1492363472001TTH29.0 ppb
2017-11-1492363472003TTH32.0 ppb
2017-11-1492363472002TTH16.0 ppb
2017-11-1492363472004TTH15.0 ppb
2018-02-0792372639004TTH 11.0 ppb
2018-02-0792372639003TTH 19.0 ppb
2018-02-0792372639002TTH 11.0 ppb
2018-02-0792372639001TTH 13.0 ppb
2018-05-0892384010004TTH 16.0 ppb
2018-05-0892384010001TTH 19.0 ppb
2018-05-0892384010002TTH 14.0 ppb
2018-05-0892384010003TTH 25.0 ppb
2018-08-1492395788004TTH 33.0 ppb
2018-08-1492395788003TTH 49.0 ppb
2018-08-1492395788002TTH 36.0 ppb
2018-08-1492395788001TTH 47.0 ppb
2018-11-0792406516001TTH 30.0 ppb
2018-11-0792406516002TTH 22.0 ppb
2018-11-0792406516003TTH 32.0 ppb
2018-11-0792406516004TTH 24.0 ppb
2019-02-1292417651001_37708.50 ppb
2019-02-1292417651002_37705.70 ppb
2019-02-1292417651003_37708.80 ppb
2019-02-1292417651004_37705.50 ppb
2019-05-0792428585001_377016.3 ppb
2019-05-0792428585004_377017.3 ppb
2019-05-0792428585003_377016.1 ppb
2019-05-0792428585002_377018.0 ppb
2019-08-0792440540002_377036.0 ppb
2019-08-0792440540004_377033.0 ppb
2019-08-0792440540003_377031.0 ppb
2019-08-0792440540001_377032.0 ppb
2019-11-0592452480004_377024.0 ppb
2019-11-0592452480003_377049.0 ppb
2019-11-0592452480002_377040.0 ppb
2019-11-0592452480001_377042.0 ppb