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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Metropolitan District Commission

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

 

288

Samples

3

Samples exceeding legal limit (MCL)

288

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
201431.8 ppb484811.0 ppb - 51.0 ppb
201526.1 ppb484810.4 ppb - 52.9 ppb
201621.5 ppb48489.74 ppb - 38.9 ppb
201721.8 ppb48487.70 ppb - 38.2 ppb
201834.2 ppb484812.7 ppb - 55.0 ppb
201931.8 ppb48482.40 ppb - 69.2 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
2014-03-03BG16767HAA544.0 ppb
2014-03-03BG16769HAA529.0 ppb
2014-03-04BG16772HAA531.0 ppb
2014-03-04BG16774HAA550.0 ppb
2014-03-05BG16777HAA549.0 ppb
2014-03-05BG16779HAA542.0 ppb
2014-03-05BG16781HAA535.0 ppb
2014-03-05BG16783HAA541.0 ppb
2014-03-06BG16786HAA514.4 ppb
2014-03-06BG16788HAA523.0 ppb
2014-03-07BG16791HAA532.0 ppb
2014-03-07BG16793HAA546.0 ppb
2014-06-16AC68442GE28.0 ppb
2014-06-16AC68443GE43.7 ppb
2014-06-16AC68444GE38.8 ppb
2014-06-16AC68445GE31.3 ppb
2014-06-16AC68446GE28.7 ppb
2014-06-16AC68447GE33.9 ppb
2014-06-16AC68448GE28.6 ppb
2014-06-16AC68449GE32.5 ppb
2014-06-16AC68450GE21.5 ppb
2014-06-16AC68451GE41.0 ppb
2014-06-16AC68452GE14.6 ppb
2014-06-16AC68453GE14.8 ppb
2014-09-08AC77253GE38.1 ppb
2014-09-08AC77257GE30.1 ppb
2014-09-09AC77256GE49.3 ppb
2014-09-09AC77258GE39.0 ppb
2014-09-09AC77263GE36.5 ppb
2014-09-10AC77249GE37.0 ppb
2014-09-10AC77254GE51.0 ppb
2014-09-10AC77255GE47.0 ppb
2014-09-11AC77259GE24.0 ppb
2014-09-11AC77260GE21.6 ppb
2014-09-12AC77250GE49.3 ppb
2014-09-12AC77251GE49.0 ppb
2014-12-01AC84506GE23.4 ppb
2014-12-01AC84510GE18.8 ppb
2014-12-02AC84505GE29.0 ppb
2014-12-02AC84509GE21.5 ppb
2014-12-02AC84511GE22.2 ppb
2014-12-02AC84512GE11.0 ppb
2014-12-03AC84502GE25.1 ppb
2014-12-03AC84503GE19.9 ppb
2014-12-03AC84507GE24.7 ppb
2014-12-03AC84508GE23.4 ppb
2014-12-04AC84513GE15.6 ppb
2014-12-05AC84504GE24.3 ppb
2015-03-09AC92680GE31.5 ppb
2015-03-09AC92684GE33.8 ppb
2015-03-10AC92683GE20.2 ppb
2015-03-10AC92685GE28.6 ppb
2015-03-10AC92679GE39.6 ppb
2015-03-11AC92676GE30.5 ppb
2015-03-11AC92681GE27.8 ppb
2015-03-11AC92677GE40.4 ppb
2015-03-11AC92682GE28.8 ppb
2015-03-12AC92687GE16.5 ppb
2015-03-12AC92686GE10.4 ppb
2015-03-13AC92678GE26.0 ppb
2015-06-01AC99952GE20.4 ppb
2015-06-01AC99948GE28.2 ppb
2015-06-02AC99951GE30.0 ppb
2015-06-02AC99947GE30.2 ppb
2015-06-02AC99953GE35.5 ppb
2015-06-03AC99950GE14.9 ppb
2015-06-03AC99949GE39.0 ppb
2015-06-03AC99944GE34.2 ppb
2015-06-04AC99954GE29.8 ppb
2015-06-04AC99945GE52.9 ppb
2015-06-04AC99955GE17.7 ppb
2015-06-05AC99946GE32.8 ppb
2015-09-08AD08702GE28.0 ppb
2015-09-08AD08704GE23.2 ppb
2015-09-08AD08698GE18.7 ppb
2015-09-08AD08699GE20.7 ppb
2015-09-09AD08700GE30.4 ppb
2015-09-09AD08695GE21.3 ppb
2015-09-09AD08701GE28.8 ppb
2015-09-09AD08696GE32.1 ppb
2015-09-10AD08705GE16.1 ppb
2015-09-10AD08706GE15.4 ppb
2015-09-11AD08703GE20.9 ppb
2015-09-11AD08697GE30.0 ppb
2015-11-30AD16140GE21.7 ppb
2015-11-30AD16144GE23.3 ppb
2015-12-01AD16145GE29.1 ppb
2015-12-01AD16143GE24.9 ppb
2015-12-01AD16139GE23.7 ppb
2015-12-02AD16136GE20.6 ppb
2015-12-02AD16137GE18.9 ppb
2015-12-02AD16142GE23.2 ppb
2015-12-02AD16141GE28.8 ppb
2015-12-04AD16147GE12.9 ppb
2015-12-04AD16146GE17.7 ppb
2015-12-05AD16138GE25.0 ppb
2016-02-29AD24009GE38.9 ppb
2016-02-29AD24010GE29.4 ppb
2016-02-29AD24014GE29.4 ppb
2016-02-29AD24015GE24.4 ppb
2016-03-01AD24016GE12.0 ppb
2016-03-01AD24013GE21.7 ppb
2016-03-02AD24006GE32.5 ppb
2016-03-02AD24007GE37.2 ppb
2016-03-02AD24011GE26.5 ppb
2016-03-02AD24012GE27.6 ppb
2016-03-03AD24017GE15.7 ppb
2016-03-04AD24008GE21.8 ppb
2016-05-30AD32112GE30.0 ppb
2016-05-30AD32107GE24.3 ppb
2016-05-31AD32110GE31.7 ppb
2016-05-31AD32111GE21.0 ppb
2016-05-31AD32106GE26.3 ppb
2016-06-01AD32108GE31.8 ppb
2016-06-01AD32109GE31.0 ppb
2016-06-01AD32103GE28.4 ppb
2016-06-01AD32104GE37.8 ppb
2016-06-02AD32113GE15.3 ppb
2016-06-02AD32114GE16.0 ppb
2016-06-03AD32105GE30.7 ppb
2016-09-12AD41850GE18.5 ppb
2016-09-12AD41846GE17.0 ppb
2016-09-13AD41845GE23.4 ppb
2016-09-13AD41849GE21.5 ppb
2016-09-13AD41851GE21.7 ppb
2016-09-14AD41847GE19.7 ppb
2016-09-14AD41848GE23.0 ppb
2016-09-14AD41842GE16.2 ppb
2016-09-14AD41843GE22.3 ppb
2016-09-15AD41852GE19.8 ppb
2016-09-15AD41853GE14.2 ppb
2016-09-16AD41844GE24.1 ppb
2016-12-05AD49844GE10.9 ppb
2016-12-05AD49848GE12.8 ppb
2016-12-06AD49849GE11.3 ppb
2016-12-06AD49843GE15.0 ppb
2016-12-06AD49847GE12.2 ppb
2016-12-07AD49845GE12.7 ppb
2016-12-07AD49846GE15.2 ppb
2016-12-07AD49840GE11.9 ppb
2016-12-07AD49841GE10.9 ppb
2016-12-08AD49850GE12.7 ppb
2016-12-09AD49851GE9.74 ppb
2016-12-09AD49842GE12.4 ppb
2017-03-06AD57226GE18.4 ppb
2017-03-06AD57222GE21.0 ppb
2017-03-07AD57227GE21.9 ppb
2017-03-07AD57221GE32.8 ppb
2017-03-07AD57225GE14.9 ppb
2017-03-08AD57223GE27.4 ppb
2017-03-08AD57224GE20.4 ppb
2017-03-08AD57218GE28.2 ppb
2017-03-08AD57219GE27.8 ppb
2017-03-09AD57228GE11.9 ppb
2017-03-09AD57229GE15.4 ppb
2017-03-10AD57220GE18.0 ppb
2017-06-12AD65857GE21.6 ppb
2017-06-12AD65861GE17.1 ppb
2017-06-13AD65862GE25.2 ppb
2017-06-13AD65856GE19.7 ppb
2017-06-14AD65853GE22.3 ppb
2017-06-14AD65854GE38.2 ppb
2017-06-14AD65858GE23.6 ppb
2017-06-14AD65859GE26.1 ppb
2017-06-15AD65860GE24.2 ppb
2017-06-15AD65863GE11.5 ppb
2017-06-15AD65864GE11.2 ppb
2017-06-16AD65855GE23.9 ppb
2017-09-12AD74745GE31.1 ppb
2017-09-12AD74746GE21.5 ppb
2017-09-12AD74749GE21.9 ppb
2017-09-12AD74750GE19.4 ppb
2017-09-12AD74751GE23.9 ppb
2017-09-13AD74747GE32.4 ppb
2017-09-13AD74748GE24.7 ppb
2017-09-13AD74742GE11.2 ppb
2017-09-13AD74743GE26.0 ppb
2017-09-14AD74752GE14.4 ppb
2017-09-14AD74753GE12.7 ppb
2017-09-15AD74744GE28.8 ppb
2017-12-04AD82362GE23.0 ppb
2017-12-04AD82366GE15.7 ppb
2017-12-05AD82367GE27.0 ppb
2017-12-05AD82361GE24.6 ppb
2017-12-05AD82365GE25.6 ppb
2017-12-06AD82363GE26.0 ppb
2017-12-06AD82364GE23.7 ppb
2017-12-06AD82358GE23.3 ppb
2017-12-06AD82359GE22.9 ppb
2017-12-07AD82368GE7.70 ppb
2017-12-07AD82369GE9.96 ppb
2017-12-08AD82360GE27.2 ppb
2018-03-05AD89784GE40.0 ppb
2018-03-05AD89780GE34.0 ppb
2018-03-06AD89781GE38.0 ppb
2018-03-06AD89782GE30.0 ppb
2018-03-06AD89783GE25.0 ppb
2018-03-06AD89776GE37.0 ppb
2018-03-06AD89777GE40.0 ppb
2018-03-06AD89785GE30.0 ppb
2018-03-06AD89779GE47.0 ppb
2018-03-08AD89786GE20.0 ppb
2018-03-08AD89787GE19.0 ppb
2018-03-09AD89778GE30.0 ppb
2018-06-11DBP 20049771724.4 ppb
2018-06-11DBP 20049771631.9 ppb
2018-06-12DBP 20049771836.0 ppb
2018-06-12DBP 20049771939.1 ppb
2018-06-12DBP 20049772033.7 ppb
2018-06-13DBP 20049772150.8 ppb
2018-06-13DBP 20049772235.5 ppb
2018-06-13DBP 20049772336.9 ppb
2018-06-13DBP 20049772429.2 ppb
2018-06-14DBP 20049772515.1 ppb
2018-06-14DBP 20049772615.5 ppb
2018-06-15DBP 20049772732.9 ppb
2018-09-05AE06396GE39.9 ppb
2018-09-05AE06397GE41.8 ppb
2018-09-05AE06391GE28.0 ppb
2018-09-05AE06392GE36.8 ppb
2018-09-06AE06394GE33.6 ppb
2018-09-06AE06399GE25.2 ppb
2018-09-06AE06400GE34.3 ppb
2018-09-06AE06401GE21.9 ppb
2018-09-06AE06402GE12.7 ppb
2018-09-07AE06395GE29.9 ppb
2018-09-07AE06393GE38.4 ppb
2018-09-07AE06398GE35.0 ppb
2018-12-03AE14329GE44.7 ppb
2018-12-03AE14330GE42.6 ppb
2018-12-03AE14334GE37.8 ppb
2018-12-04AE14335GE55.0 ppb
2018-12-04AE14333GE45.9 ppb
2018-12-05AE14326GE33.7 ppb
2018-12-05AE14327GE47.6 ppb
2018-12-05AE14331GE52.8 ppb
2018-12-05AE14332GE45.4 ppb
2018-12-06AE14336GE19.7 ppb
2018-12-06AE14337GE19.2 ppb
2018-12-07AE14328GE50.3 ppb
2019-03-11AE22324GE38.6 ppb
2019-03-11AE22328GE41.8 ppb
2019-03-12AE22329GE58.5 ppb
2019-03-12AE22323GE51.2 ppb
2019-03-12AE22327GE41.3 ppb
2019-03-13AE22325GE69.2 ppb
2019-03-13AE22326GE46.4 ppb
2019-03-13AE22320GE44.1 ppb
2019-03-13AE22321GE65.4 ppb
2019-03-14AE22330GE15.7 ppb
2019-03-14AE22331GE20.3 ppb
2019-03-15AE22322GE44.5 ppb
2019-06-03AE30192GE41.8 ppb
2019-06-03AE30196GE28.6 ppb
2019-06-04AE30197GE36.6 ppb
2019-06-04AE30191GE42.4 ppb
2019-06-04AE30195GE44.0 ppb
2019-06-05AE30188GE15.9 ppb
2019-06-05AE30189GE67.2 ppb
2019-06-05AE30193GE53.0 ppb
2019-06-05AE30194GE40.3 ppb
2019-06-06AE30198GE18.5 ppb
2019-06-06AE30199GE15.1 ppb
2019-06-07AE30190GE41.0 ppb
2019-09-09DBP 20054882523.9 ppb
2019-09-09DBP 20054882620.6 ppb
2019-09-10DBP 20054882733.6 ppb
2019-09-10DBP 20054882928.1 ppb
2019-09-10DBP 20054882824.4 ppb
2019-09-10DBP 20054883035.7 ppb
2019-09-11DBP 20054883131.3 ppb
2019-09-11DBP 20054883233.9 ppb
2019-09-11DBP 2005488332.40 ppb
2019-09-12DBP 20054883418.3 ppb
2019-09-12DBP 20054883512.8 ppb
2019-09-13DBP 20054883632.6 ppb
2019-12-02DBP 20055925617.5 ppb
2019-12-02DBP 20055925522.1 ppb
2019-12-03DBP 20055925722.1 ppb
2019-12-03DBP 20055925822.1 ppb
2019-12-03DBP 20055925921.7 ppb
2019-12-04DBP 20055926022.4 ppb
2019-12-04DBP 20055926127.8 ppb
2019-12-04DBP 20055926223.9 ppb
2019-12-04DBP 20055926320.7 ppb
2019-12-05DBP 20055926413.2 ppb
2019-12-05DBP 20055926514.2 ppb
2019-12-06DBP 20055926622.1 ppb