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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Scarsdale Water Department

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)

96

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201436.5 ppb16168.70 ppb - 50.0 ppb
201531.9 ppb161623.0 ppb - 42.0 ppb
201635.6 ppb16166.60 ppb - 52.0 ppb
201738.9 ppb161630.0 ppb - 51.0 ppb
201838.7 ppb161628.0 ppb - 50.0 ppb
201934.3 ppb161622.0 ppb - 53.0 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
2014-01-17201401200021DBP38.0 ppb
2014-01-17201401200020DBP37.0 ppb
2014-01-17201401200019DBP40.0 ppb
2014-01-17201401200022DBP31.0 ppb
2014-04-17201404180351DBP48.0 ppb
2014-04-17201404180349DBP8.70 ppb
2014-04-17201404180348DBP42.0 ppb
2014-04-17201404180350DBP50.0 ppb
2014-07-17201407180424DBP41.0 ppb
2014-07-17201407180423DBP36.0 ppb
2014-07-17201407180425DBP21.0 ppb
2014-07-17201407180422DBP47.0 ppb
2014-10-17201410180109 DBP27.0 ppb
2014-10-17201410180106 DBP47.0 ppb
2014-10-17201410180108 DBP36.0 ppb
2014-10-17201410180107 DBP35.0 ppb
2015-01-16201501170042DBP28.0 ppb
2015-01-16201501170044DBP29.0 ppb
2015-01-16201501170043DBP34.0 ppb
2015-01-16201501170045DBP23.0 ppb
2015-04-17201504180152DBP30.0 ppb
2015-04-17201504180149DBP33.0 ppb
2015-04-17201504180151DBP40.0 ppb
2015-04-17201504180150DBP37.0 ppb
2015-07-28201507290514 DBP26.0 ppb
2015-07-28201507290516 DBP23.0 ppb
2015-07-28201507290515 DBP39.0 ppb
2015-07-28201507290517 DBP29.0 ppb
2015-10-15201510160387 DBP37.0 ppb
2015-10-15201510160386 DBP33.0 ppb
2015-10-15201510160385 DBP42.0 ppb
2015-10-15201510160388 DBP27.0 ppb
2016-01-20201601210649 Q143.0 ppb
2016-01-21201601210648 DBP38.0 ppb
2016-01-21201601210651 DBP23.0 ppb
2016-01-21201601210650 Q139.0 ppb
2016-04-18201604190506 DBP41.0 ppb
2016-04-18201604190507 DBP45.0 ppb
2016-04-18201604190508 DBP52.0 ppb
2016-04-18201604190509 DBP6.60 ppb
2016-07-18201607190664 DBP32.0 ppb
2016-07-18201607190662 DBP31.0 ppb
2016-07-18201607190663 DBP45.0 ppb
2016-07-18201607190661 DBP42.0 ppb
2016-10-17201610180616 DBP28.0 ppb
2016-10-17201610180615 DBP47.0 ppb
2016-10-17201610180614 DBP30.0 ppb
2016-10-17201610180613 DBP27.0 ppb
2017-01-17201701180837 DBP32.0 ppb
2017-01-17201701180835 DBP30.0 ppb
2017-01-17201701180836 DBP32.0 ppb
2017-01-17201701180838 DBP31.0 ppb
2017-04-17201704180816-DBP44.0 ppb
2017-04-17201704180815-DBP37.0 ppb
2017-04-17201704180813-DBP41.0 ppb
2017-04-17201704180814-DBP42.0 ppb
2017-07-17201707180301-DBP51.0 ppb
2017-07-17201707180303-DBP42.0 ppb
2017-07-17201707180304-DBP42.0 ppb
2017-07-17201707180302-DBP48.0 ppb
2017-10-17201710180635-DBP36.0 ppb
2017-10-17201710180632-DBP41.0 ppb
2017-10-17201710180634-DBP41.0 ppb
2017-10-17201710180633-DBP33.0 ppb
2018-01-17201801180349-DBP40.0 ppb
2018-01-17201801180352-DBP35.0 ppb
2018-01-17201801180351-DBP40.0 ppb
2018-01-17201801180350-DBP38.0 ppb
2018-04-17201804180722-DBP40.0 ppb
2018-04-17201804180720-DBP45.0 ppb
2018-04-17201804180719-DBP42.0 ppb
2018-04-17201804180721-DBP49.0 ppb
2018-07-17201807200437-DBP50.0 ppb
2018-07-17201807200435-DBP41.0 ppb
2018-07-17201807200439-DBP34.0 ppb
2018-07-17201807200433-DBP48.0 ppb
2018-10-17201810180782-DBP31.0 ppb
2018-10-17201810180783-DBP28.0 ppb
2018-10-17201810180784-DBP28.0 ppb
2018-10-17201810180781-DBP30.0 ppb
2019-01-17201901180375-DBP40.0 ppb
2019-01-17201901180374-DBP47.0 ppb
2019-01-17201901180376-DBP44.0 ppb
2019-01-17201901180373-DBP42.0 ppb
2019-04-17201904180643-DBP53.0 ppb
2019-04-17201904180644-DBP23.0 ppb
2019-04-17201904180641-DBP37.0 ppb
2019-04-17201904180642-DBP34.0 ppb
2019-07-17201907180458-DBP34.0 ppb
2019-07-17201907180459-DBP30.0 ppb
2019-07-17201907180457-DBP36.0 ppb
2019-07-17201907180460-DBP29.0 ppb
2019-10-17201910180230-DBP27.0 ppb
2019-10-17201910180231-DBP27.0 ppb
2019-10-17201910180232-DBP24.0 ppb
2019-10-17201910180233-DBP22.0 ppb