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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

City of Tucson

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.

 

192

Samples

0

Samples exceeding legal limit (MCL)

132

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.46 ppb3224ND - 11.0 ppb
20151.13 ppb3222ND - 2.90 ppb
20161.46 ppb3223ND - 11.0 ppb
20170.688 ppb3214ND - 3.00 ppb
20181.42 ppb3228ND - 3.10 ppb
20190.953 ppb3221ND - 2.00 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
2014-01-082014010905211.10 ppb
2014-01-082014010905221.30 ppb
2014-01-082014010905231.10 ppb
2014-01-082014010905241.70 ppb
2014-01-08201401090525ND
2014-01-08201401090526ND
2014-01-082014010905271.10 ppb
2014-01-08201401090528ND
2014-04-092014041004841.10 ppb
2014-04-092014041004851.000 ppb
2014-04-09201404100486ND
2014-04-09201404100487ND
2014-04-092014041004881.30 ppb
2014-04-092014041004891.000 ppb
2014-04-092014041004901.70 ppb
2014-04-092014041004911.000 ppb
2014-07-0920140711045611.0 ppb
2014-07-092014071104571.20 ppb
2014-07-092014071104582.40 ppb
2014-07-092014071104592.00 ppb
2014-07-092014071104601.20 ppb
2014-07-09201407110461ND
2014-07-092014071104621.70 ppb
2014-07-09201407110463ND
2014-10-082014100906293.90 ppb
2014-10-082014100906311.10 ppb
2014-10-082014100906321.30 ppb
2014-10-082014100906331.60 ppb
2014-10-08201410090634ND
2014-10-082014100906351.50 ppb
2014-10-082014100906362.50 ppb
2014-10-082014100906372.00 ppb
2015-01-072015010804222.00 ppb
2015-01-07201501080433ND
2015-01-07201501080434ND
2015-01-072015010804351.50 ppb
2015-01-072015010804361.90 ppb
2015-01-07201501080437ND
2015-01-07201501080438ND
2015-01-07201501080439ND
2015-04-082015041002571.50 ppb
2015-04-08201504100258ND
2015-04-082015041002591.30 ppb
2015-04-082015041002601.70 ppb
2015-04-082015041002611.60 ppb
2015-04-082015041002621.30 ppb
2015-04-082015041002632.40 ppb
2015-04-082015041002641.60 ppb
2015-07-222015072401352.20 ppb
2015-07-22201507240186ND
2015-07-222015072401871.10 ppb
2015-07-22201507240188ND
2015-07-222015072401891.60 ppb
2015-07-22201507240190ND
2015-07-222015072401911.20 ppb
2015-07-222015072401921.10 ppb
2015-10-072015100905302.90 ppb
2015-10-07201510090533ND
2015-10-072015100905341.40 ppb
2015-10-072015100905351.80 ppb
2015-10-072015100905361.60 ppb
2015-10-072015100905371.60 ppb
2015-10-072015100905381.30 ppb
2015-10-072015100905391.50 ppb
2016-01-06201601070308ND
2016-01-06201601070309ND
2016-01-06201601070310ND
2016-01-062016010703111.20 ppb
2016-01-062016010703121.50 ppb
2016-01-062016010703131.10 ppb
2016-01-062016010703141.40 ppb
2016-01-062016010703151.50 ppb
2016-04-062016040711501.40 ppb
2016-04-06201604071151ND
2016-04-062016040711521.60 ppb
2016-04-062016040711531.60 ppb
2016-04-062016040711542.20 ppb
2016-04-062016040711551.50 ppb
2016-04-062016040711561.90 ppb
2016-04-0620160407115711.0 ppb
2016-07-062016070707842.70 ppb
2016-07-06201607070785ND
2016-07-062016070707862.00 ppb
2016-07-06201607070787ND
2016-07-062016070707882.00 ppb
2016-07-062016070707891.50 ppb
2016-07-062016070707901.60 ppb
2016-07-062016070707911.40 ppb
2016-10-052016100605453.30 ppb
2016-10-05201610060546ND
2016-10-05201610060547ND
2016-10-052016100605481.10 ppb
2016-10-052016100605491.10 ppb
2016-10-05201610060550ND
2016-10-052016100605511.10 ppb
2016-10-052016100605521.10 ppb
2017-01-052017011002821.10 ppb
2017-01-05201701100283ND
2017-01-05201701100284ND
2017-01-05201701100285ND
2017-01-05201701100286ND
2017-01-05201701100287ND
2017-01-05201701100288ND
2017-01-05201701100289ND
2017-04-05201704060799ND
2017-04-05201704060800ND
2017-04-05201704060801ND
2017-04-05201704060802ND
2017-04-05201704060803ND
2017-04-05201704060804ND
2017-04-05201704060805ND
2017-04-052017040608061.10 ppb
2017-07-052017070609091.90 ppb
2017-07-05201707060910ND
2017-07-05201707060911ND
2017-07-052017070609121.40 ppb
2017-07-052017070609131.50 ppb
2017-07-05201707060914ND
2017-07-052017070609151.30 ppb
2017-07-052017070609161.30 ppb
2017-10-042017100501733.00 ppb
2017-10-04201710050174ND
2017-10-042017100501751.60 ppb
2017-10-042017100501761.60 ppb
2017-10-042017100501771.40 ppb
2017-10-042017100501781.50 ppb
2017-10-042017100501791.50 ppb
2017-10-042017100501801.80 ppb
2018-01-032018010404681.40 ppb
2018-01-03201801040469ND
2018-01-03201801040470ND
2018-01-032018010404711.40 ppb
2018-01-032018010404721.50 ppb
2018-01-032018010404731.60 ppb
2018-01-032018010404741.40 ppb
2018-01-032018010404751.50 ppb
2018-04-042018040602521.000 ppb
2018-04-042018040602531.20 ppb
2018-04-042018040602541.90 ppb
2018-04-042018040602551.70 ppb
2018-04-04201804060256ND
2018-04-042018040602571.30 ppb
2018-04-042018040602591.40 ppb
2018-04-04201804062581.30 ppb
2018-07-052018070602852.60 ppb
2018-07-05201807060290ND
2018-07-052018070602911.10 ppb
2018-07-052018070602921.60 ppb
2018-07-052018070602931.50 ppb
2018-07-052018070602941.90 ppb
2018-07-052018070602951.70 ppb
2018-07-052018070602961.80 ppb
2018-10-032018100404703.10 ppb
2018-10-032018100404711.10 ppb
2018-10-032018100404721.30 ppb
2018-10-032018100404732.00 ppb
2018-10-032018100404742.00 ppb
2018-10-032018100404751.60 ppb
2018-10-032018100404761.60 ppb
2018-10-032018100404771.80 ppb
2019-01-022019010304231.70 ppb
2019-01-02201901030448ND
2019-01-022019010304491.20 ppb
2019-01-022019010304501.50 ppb
2019-01-022019010304511.60 ppb
2019-01-022019010304521.50 ppb
2019-01-022019010304531.40 ppb
2019-01-022019010304541.40 ppb
2019-04-03201904040318ND
2019-04-03201904040320ND
2019-04-03201904040321ND
2019-04-032019040403221.50 ppb
2019-04-032019040403232.00 ppb
2019-04-032019040403241.30 ppb
2019-04-032019040403251.20 ppb
2019-04-032019040403261.40 ppb
2019-07-022019070301961.60 ppb
2019-07-02201907030197ND
2019-07-02201907030198ND
2019-07-022019070301991.40 ppb
2019-07-022019070302001.50 ppb
2019-07-02201907030201ND
2019-07-02201907030202ND
2019-07-02201907030203ND
2019-10-02201900306161.70 ppb
2019-10-022019100306131.10 ppb
2019-10-02201910030614ND
2019-10-02201910030615ND
2019-10-022019100306171.60 ppb
2019-10-022019100306181.30 ppb
2019-10-022019100306191.20 ppb
2019-10-022019100306201.40 ppb