Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Haloacetic acids (HAA5)

Porter SUD

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

 

96

Samples

0

Samples exceeding legal limit (MCL)

7

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20143.17 ppb163ND - 25.4 ppb
20150.988 ppb161ND - 15.8 ppb
2016ND160ND
2017ND160ND
20180.275 ppb163ND - 1.90 ppb
2019ND160ND

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
2014-03-04AC45465ND
2014-03-04AC45470ND
2014-03-04AC45487ND
2014-03-04AC45469ND
2014-04-02AC49104ND
2014-04-02AC49117ND
2014-04-02AC491196.30 ppb
2014-04-02AC49103ND
2014-07-08AC5907125.4 ppb
2014-07-08AC5906919.0 ppb
2014-07-08AC59072ND
2014-07-08AC59070ND
2014-10-03AC68882ND
2014-10-03AC68922ND
2014-10-03AC68883ND
2014-10-03AC68885ND
2015-01-28AC78113ND
2015-01-28AC78120ND
2015-01-28AC78115ND
2015-01-28AC78119ND
2015-06-15AC95908ND
2015-06-15AC9589815.8 ppb
2015-06-15AC95925ND
2015-06-15AC95904ND
2015-07-10AC99131ND
2015-07-10AC99130ND
2015-07-10AC99119ND
2015-07-10AC99133ND
2015-11-19AD14196ND
2015-11-19AD14197ND
2015-11-19AD14202ND
2015-11-19AD14206ND
2016-01-12AD17539ND
2016-01-12AD17541ND
2016-01-12AD17547ND
2016-01-12AD17536ND
2016-04-14AD33168ND
2016-04-14AD33165ND
2016-04-14AD33166ND
2016-04-14AD33167ND
2016-07-15AD44453ND
2016-07-15AD44458ND
2016-07-15AD44461ND
2016-07-15AD44472ND
2016-11-01AD55803ND
2016-11-01AD55808ND
2016-11-01AD55804ND
2016-11-01AD55807ND
2017-01-19AD65700ND
2017-01-19AD65699ND
2017-01-19AD65698ND
2017-01-19AD65701ND
2017-04-27AD81493ND
2017-04-27AD81485ND
2017-04-27AD81492ND
2017-04-27AD81494ND
2017-08-14AD92894ND
2017-08-14AD92893ND
2017-08-14AD92888ND
2017-08-14AD92892ND
2017-10-11AE00356ND
2017-10-11AE00357ND
2017-10-11AE00355ND
2017-10-11AE00358ND
2018-01-09AE08311ND
2018-01-09AE08315ND
2018-01-09AE08329ND
2018-01-09AE08327ND
2018-04-05AE21432ND
2018-04-05AE214311.90 ppb
2018-04-05AE214051.50 ppb
2018-04-05AE21406ND
2018-08-31AE39137ND
2018-08-31AE391401.000 ppb
2018-08-31AE39136ND
2018-08-31AE39139ND
2018-10-10AE43259ND
2018-10-10AE43254ND
2018-10-10AE43256ND
2018-10-10AE43255ND
2019-01-23AE50919ND
2019-01-23AE50940ND
2019-01-23AE50920ND
2019-01-23AE50922ND
2019-04-08AE61369ND
2019-04-08AE61368ND
2019-04-08AE61373ND
2019-04-08AE61372ND
2019-07-26AE76158ND
2019-07-26AE76148ND
2019-07-26AE76145ND
2019-07-26AE76147ND
2019-10-15AE86628ND
2019-10-15AE86629ND
2019-10-15AE86633ND
2019-10-15AE86631ND