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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

St. Peters

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

 

116

Samples

0

Samples exceeding legal limit (MCL)

75

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
201410.1 ppb3217ND - 24.4 ppb
201517.2 ppb1914ND - 35.9 ppb
201615.3 ppb1710ND - 33.4 ppb
201711.0 ppb169ND - 26.5 ppb
201810.3 ppb1610ND - 22.7 ppb
201918.0 ppb1615ND - 30.9 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 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
2014-03-10AC1823421.1 ppb
2014-03-10AC1823515.7 ppb
2014-03-10AC1823623.9 ppb
2014-03-10AC1823720.2 ppb
2014-03-10AC18238ND
2014-03-10AC18239ND
2014-03-10AC18240ND
2014-03-10AC1824120.0 ppb
2014-05-28AC2324520.4 ppb
2014-05-28AC23246ND
2014-05-28AC2324217.6 ppb
2014-05-28AC2324314.8 ppb
2014-05-28AC2324418.9 ppb
2014-05-28AC23247ND
2014-05-28AC23248ND
2014-05-28AC2324919.5 ppb
2014-09-22AC3347118.9 ppb
2014-09-22AC3346423.7 ppb
2014-09-22AC3346518.5 ppb
2014-09-22AC3346624.4 ppb
2014-09-22AC3346721.1 ppb
2014-09-22AC33468ND
2014-09-22AC33469ND
2014-09-22AC33470ND
2014-12-02AC3829011.3 ppb
2014-12-02AC38291ND
2014-12-02AC3829212.9 ppb
2014-12-02AC38293ND
2014-12-02AC38294ND
2014-12-02AC38295ND
2014-12-02AC38296ND
2014-12-02AC38297ND
2015-03-09AC42022ND
2015-03-09AC42023ND
2015-03-09AC42021ND
2015-03-09AC4202013.8 ppb
2015-03-09AC4201916.5 ppb
2015-03-09AC4201811.7 ppb
2015-03-09AC4201717.9 ppb
2015-03-09AC42024ND
2015-06-03AC4658024.4 ppb
2015-06-03AC4658133.5 ppb
2015-06-03AC4657935.9 ppb
2015-06-03AC4658231.3 ppb
2015-09-21AC5756328.9 ppb
2015-09-21AC5756126.8 ppb
2015-09-21AC5756230.0 ppb
2015-09-21AC5756425.0 ppb
2015-12-29AC62848ND
2015-12-29AC6284718.7 ppb
2015-12-29AC6284511.7 ppb
2016-01-05AC62846ND
2016-03-23AC66394ND
2016-03-23AC66392ND
2016-03-23AC6639123.1 ppb
2016-03-23AC6639319.4 ppb
2016-06-22AC7208525.7 ppb
2016-06-22AC7208630.2 ppb
2016-06-22AC7208727.9 ppb
2016-06-22AC7208833.4 ppb
2016-09-21AC8173225.2 ppb
2016-09-21AC8173025.2 ppb
2016-09-21AC8173324.0 ppb
2016-09-21AC8173126.6 ppb
2016-11-15AC86987ND
2016-11-15AC86986ND
2016-11-15AC86984ND
2016-11-15AC86985ND
2017-03-15AC90834ND
2017-03-15AC90837ND
2017-03-15AC9083611.5 ppb
2017-03-15AC90835ND
2017-06-05AC9581226.5 ppb
2017-06-05AC9581321.4 ppb
2017-06-05AC9581119.5 ppb
2017-06-05AC9581422.5 ppb
2017-09-06AD0356522.6 ppb
2017-09-06AD0356616.7 ppb
2017-09-06AD0356415.3 ppb
2017-09-06AD0356719.7 ppb
2017-11-28AD09526ND
2017-11-28AD09524ND
2017-11-28AD09527ND
2017-11-28AD09525ND
2018-03-26AD1431016.8 ppb
2018-03-26AD14311ND
2018-03-26AD1431217.1 ppb
2018-03-26AD1431311.7 ppb
2018-06-05AD2054117.2 ppb
2018-06-05AD2054222.7 ppb
2018-06-05AD2054316.8 ppb
2018-06-05AD2054416.1 ppb
2018-09-06AD3135515.2 ppb
2018-09-06AD31353ND
2018-09-06AD3135414.8 ppb
2018-09-06AD3135615.8 ppb
2018-11-27AD35754ND
2018-11-27AD35751ND
2018-11-27AD35752ND
2018-11-29AD35753ND
2019-02-26AD3941917.2 ppb
2019-02-26AD3942011.3 ppb
2019-02-26AD3942118.0 ppb
2019-02-26AD3942214.4 ppb
2019-05-22AD4749718.3 ppb
2019-05-22AD4749821.9 ppb
2019-05-22AD4749921.7 ppb
2019-05-22AD4750021.9 ppb
2019-08-28AD5408823.7 ppb
2019-08-28AD5408922.5 ppb
2019-08-28AD5409022.6 ppb
2019-08-28AD5409130.9 ppb
2019-12-03AD5813317.1 ppb
2019-12-03AD5813411.2 ppb
2019-12-03AD5813514.7 ppb
2019-12-03AD58136ND