Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

Haloacetic acids (HAA5)

City of Mesa

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.

 

276

Samples

0

Samples exceeding legal limit (MCL)

260

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201214.1 ppb5148ND - 35.0 ppb
201313.3 ppb4543ND - 25.0 ppb
20149.80 ppb3631ND - 20.0 ppb
201516.3 ppb4847ND - 27.0 ppb
201615.0 ppb48481.40 ppb - 26.0 ppb
201717.2 ppb4843ND - 40.0 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 on-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
2012-02-0720120207014111.0 ppb
2012-02-072012020701428.70 ppb
2012-02-072012020701445.50 ppb
2012-02-0720120207014512.0 ppb
2012-02-0720120207014611.0 ppb
2012-02-0720120207014711.0 ppb
2012-02-0720120207014811.0 ppb
2012-02-0720120207014913.0 ppb
2012-02-072012020701509.60 ppb
2012-02-072012020701515.60 ppb
2012-02-0720120207015211.0 ppb
2012-02-0720120207015311.0 ppb
2012-02-0720120207015416.0 ppb
2012-02-0720120207015513.0 ppb
2012-02-0720120207015611.0 ppb
2012-05-1520120516014913.0 ppb
2012-05-1520120516015010.00 ppb
2012-05-1520120516015112.0 ppb
2012-05-1520120516015214.0 ppb
2012-05-1520120516015316.0 ppb
2012-05-1520120516015422.0 ppb
2012-05-1520120516015513.0 ppb
2012-05-1520120516015613.0 ppb
2012-05-1520120516015722.0 ppb
2012-05-1520120516015812.0 ppb
2012-05-1520120516015935.0 ppb
2012-05-1520120516016024.0 ppb
2012-08-142012081402159.30 ppb
2012-08-142012081402169.70 ppb
2012-08-1420120814021711.0 ppb
2012-08-1420120814021810.00 ppb
2012-08-1420120814021917.0 ppb
2012-08-1420120814022018.0 ppb
2012-08-1420120814022113.0 ppb
2012-08-1420120814022217.0 ppb
2012-08-1420120814022317.0 ppb
2012-08-1420120814022421.0 ppb
2012-08-1420120814022529.0 ppb
2012-08-1420120814022624.0 ppb
2012-11-13201211140336ND
2012-11-13201211140337ND
2012-11-132012111403381.40 ppb
2012-11-1320121114034017.0 ppb
2012-11-1320121114034120.0 ppb
2012-11-1320121114034226.0 ppb
2012-11-1320121114034319.0 ppb
2012-11-1320121114034418.0 ppb
2012-11-13201211140345ND
2012-11-1320121114034622.0 ppb
2012-11-1320121114034717.0 ppb
2012-12-0520121206027616.0 ppb
2013-02-122013021403996.30 ppb
2013-02-122013021404019.10 ppb
2013-02-122013021404029.60 ppb
2013-02-122013021404035.10 ppb
2013-02-122013021404042.00 ppb
2013-02-122013021404057.80 ppb
2013-02-12201302140406ND
2013-02-1220130214040710.00 ppb
2013-02-132013021404006.80 ppb
2013-05-1420130516017121.0 ppb
2013-05-14201305160172ND
2013-05-1420130516017316.0 ppb
2013-05-1420130516017416.0 ppb
2013-05-1420130516017516.0 ppb
2013-05-1420130516017625.0 ppb
2013-05-1420130516017721.0 ppb
2013-05-1420130516017818.0 ppb
2013-05-1420130516017915.0 ppb
2013-05-1420130516018015.0 ppb
2013-05-1420130516018125.0 ppb
2013-05-1420130516018216.0 ppb
2013-08-1320130813041411.0 ppb
2013-08-1320130813041510.00 ppb
2013-08-132013081304166.40 ppb
2013-08-1320130813041721.0 ppb
2013-08-132013081304188.70 ppb
2013-08-1320130813041918.0 ppb
2013-08-1320130813042012.0 ppb
2013-08-1320130813042120.0 ppb
2013-08-132013081304226.00 ppb
2013-08-1320130813042313.0 ppb
2013-08-1320130813042424.0 ppb
2013-08-1320130813042513.0 ppb
2013-11-1220131113034416.0 ppb
2013-11-1220131113034716.0 ppb
2013-11-1220131113034817.0 ppb
2013-11-1220131113034916.0 ppb
2013-11-122013111303508.60 ppb
2013-11-1220131113035117.0 ppb
2013-11-1220131113035215.0 ppb
2013-11-1220131113035312.0 ppb
2013-11-1220131113035423.0 ppb
2013-11-1220131113035519.0 ppb
2013-12-0520131205034712.0 ppb
2013-12-052013120503484.80 ppb
2014-05-132014051406172.90 ppb
2014-05-13201405140618ND
2014-05-132014051406192.40 ppb
2014-05-132014051406202.80 ppb
2014-05-1320140514062115.0 ppb
2014-05-1320140514062218.0 ppb
2014-05-132014051406237.30 ppb
2014-05-1320140514062419.0 ppb
2014-05-1320140514062519.0 ppb
2014-05-1320140514062612.0 ppb
2014-05-132014051406278.80 ppb
2014-05-132014051406308.20 ppb
2014-08-122014081205496.00 ppb
2014-08-122014081205505.00 ppb
2014-08-122014081205516.80 ppb
2014-08-1220140812055212.0 ppb
2014-08-1220140812055316.0 ppb
2014-08-1220140812055417.0 ppb
2014-08-122014081205557.60 ppb
2014-08-1220140812055618.0 ppb
2014-08-12201408120557ND
2014-08-122014081205588.40 ppb
2014-08-122014081205597.20 ppb
2014-08-122014081205605.00 ppb
2014-11-12201411130478ND
2014-11-12201411130479ND
2014-11-12201411130480ND
2014-11-1220141113048117.0 ppb
2014-11-1220141113048215.0 ppb
2014-11-1220141113048316.0 ppb
2014-11-122014111304846.10 ppb
2014-11-1220141113048518.0 ppb
2014-11-122014111304877.40 ppb
2014-11-1220141113048820.0 ppb
2014-11-1220141113048914.0 ppb
2014-11-122014113048615.0 ppb
2015-02-1020150212037718.0 ppb
2015-02-102015021203785.40 ppb
2015-02-102015021203794.60 ppb
2015-02-1020150212038017.0 ppb
2015-02-1020150212038116.0 ppb
2015-02-1020150212038214.0 ppb
2015-02-1020150212038318.0 ppb
2015-02-1020150212038418.0 ppb
2015-02-1020150212038514.0 ppb
2015-02-1020150212038617.0 ppb
2015-02-1020150212038721.0 ppb
2015-02-1020150212038822.0 ppb
2015-05-1220150513007920.0 ppb
2015-05-1220150513008020.0 ppb
2015-05-1220150513008120.0 ppb
2015-05-1220150513008221.0 ppb
2015-05-1220150513008318.0 ppb
2015-05-1220150513008419.0 ppb
2015-05-1220150513008526.0 ppb
2015-05-1220150513008619.0 ppb
2015-05-1220150513008716.0 ppb
2015-05-122015051300888.30 ppb
2015-05-1220150513008927.0 ppb
2015-05-1220150513009017.0 ppb
2015-08-11201150812023324.0 ppb
2015-08-112015081202267.10 ppb
2015-08-112015081202278.30 ppb
2015-08-112015081202288.20 ppb
2015-08-1120150812022920.0 ppb
2015-08-1120150812023017.0 ppb
2015-08-1120150812023118.0 ppb
2015-08-1120150812023219.0 ppb
2015-08-112015081202343.10 ppb
2015-08-112015081202354.40 ppb
2015-08-1120150812023619.0 ppb
2015-08-1120150812023719.0 ppb
2015-11-10201511120216ND
2015-11-1020151112021714.0 ppb
2015-11-1020151112021818.0 ppb
2015-11-1020151112021923.0 ppb
2015-11-1020151112022018.0 ppb
2015-11-1020151112022118.0 ppb
2015-11-1020151112022220.0 ppb
2015-11-1020151112022316.0 ppb
2015-11-1020151112022415.0 ppb
2015-11-1020151112022513.0 ppb
2015-11-1020151112022622.0 ppb
2015-11-1020151112022720.0 ppb
2016-02-092016021001527.60 ppb
2016-02-0920160210015313.0 ppb
2016-02-0920160210015413.0 ppb
2016-02-0920160210015514.0 ppb
2016-02-0920160210015612.0 ppb
2016-02-0920160210015712.0 ppb
2016-02-0920160210015815.0 ppb
2016-02-0920160210015913.0 ppb
2016-02-0920160210016011.0 ppb
2016-02-0920160210016118.0 ppb
2016-02-0920160210016220.0 ppb
2016-02-0920160210016320.0 ppb
2016-05-1020160511010915.0 ppb
2016-05-102016051101108.00 ppb
2016-05-102016051101117.20 ppb
2016-05-1020160511011221.0 ppb
2016-05-1020160511011319.0 ppb
2016-05-1020160511011416.0 ppb
2016-05-1020160511011515.0 ppb
2016-05-1020160511011618.0 ppb
2016-05-1020160511011716.0 ppb
2016-05-102016051101189.90 ppb
2016-05-1020160511011919.0 ppb
2016-05-1020160511012021.0 ppb
2016-08-0920160810029018.0 ppb
2016-08-0920160810029111.0 ppb
2016-08-092016081002927.80 ppb
2016-08-0920160810029320.0 ppb
2016-08-0920160810029419.0 ppb
2016-08-0920160810029519.0 ppb
2016-08-0920160810029618.0 ppb
2016-08-0920160810029719.0 ppb
2016-08-0920160810029815.0 ppb
2016-08-092016081002992.40 ppb
2016-08-0920160810030020.0 ppb
2016-08-0920160810030120.0 ppb
2016-11-0820161109005722.0 ppb
2016-11-0820161109005813.0 ppb
2016-11-0820161109005926.0 ppb
2016-11-0820161109006017.0 ppb
2016-11-0820161109006114.0 ppb
2016-11-0820161109006214.0 ppb
2016-11-0820161109006315.0 ppb
2016-11-0820161109006414.0 ppb
2016-11-082016110900651.40 ppb
2016-11-082016110900669.30 ppb
2016-11-0820161109006717.0 ppb
2016-11-0820161109006812.0 ppb
2017-02-07201702080213ND
2017-02-07201702080214ND
2017-02-07201702080215ND
2017-02-0720170208021616.0 ppb
2017-02-0720170208021716.0 ppb
2017-02-0720170208021814.0 ppb
2017-02-0720170208021916.0 ppb
2017-02-0720170208022016.0 ppb
2017-02-0720170208022115.0 ppb
2017-02-072017020802226.10 ppb
2017-02-0720170208022320.0 ppb
2017-02-0720170208022420.0 ppb
2017-05-0920170510048524.0 ppb
2017-05-0920170510048625.0 ppb
2017-05-0920170510048832.0 ppb
2017-05-0920170510048922.0 ppb
2017-05-0920170510049017.0 ppb
2017-05-0920170510049119.0 ppb
2017-05-0920170510049220.0 ppb
2017-05-0920170510049319.0 ppb
2017-05-09201705100494ND
2017-05-092017051004958.50 ppb
2017-05-092017051004969.10 ppb
2017-05-3020170531034415.0 ppb
2017-08-0820170809068123.0 ppb
2017-08-0820170809068220.0 ppb
2017-08-0820170809068317.0 ppb
2017-08-0820170809068421.0 ppb
2017-08-0820170809068523.0 ppb
2017-08-0820170809068619.0 ppb
2017-08-0820170809068716.0 ppb
2017-08-0820170809068817.0 ppb
2017-08-0820170809068917.0 ppb
2017-08-0820170809069014.0 ppb
2017-08-0820170809069117.0 ppb
2017-08-0820170809069212.0 ppb
2017-11-07201711080307ND
2017-11-0720171108030840.0 ppb
2017-11-0720171108030938.0 ppb
2017-11-0720171108031022.0 ppb
2017-11-0720171108031119.0 ppb
2017-11-0720171108031219.0 ppb
2017-11-0720171108031337.0 ppb
2017-11-0720171108031435.0 ppb
2017-11-072017110803152.90 ppb
2017-11-072017110803164.50 ppb
2017-11-0720171108031718.0 ppb
2017-11-0720171108031823.0 ppb