Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Haloacetic acids (HAA5)

City of Gonzales Water System

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

 

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
20140.275 ppb328ND - 1.30 ppb
20150.656 ppb3218ND - 1.60 ppb
20160.881 ppb3220ND - 2.20 ppb
20171.14 ppb3230ND - 1.90 ppb
20183.95 ppb3226ND - 31.5 ppb
20191.96 ppb3230ND - 10.6 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
2014-02-17201164735ND
2014-02-17201164736ND
2014-02-17201164737ND
2014-02-17201164738ND
2014-02-17201164735ND
2014-02-17201164736ND
2014-02-17201164737ND
2014-02-17201164738ND
2014-05-19204176001ND
2014-05-192041850011.000 ppb
2014-05-19204187001ND
2014-05-192041890011.000 ppb
2014-05-19204176001ND
2014-05-192041850011.000 ppb
2014-05-19204187001ND
2014-05-192041890011.000 ppb
2014-08-18208140001ND
2014-08-18208141001ND
2014-08-18208143001ND
2014-08-18208144001ND
2014-08-18208140001ND
2014-08-18208141001ND
2014-08-18208143001ND
2014-08-18208144001ND
2014-11-192012533001ND
2014-11-192012533002ND
2014-11-1920125330031.10 ppb
2014-11-1920125330041.30 ppb
2014-11-192012533001ND
2014-11-192012533002ND
2014-11-1920125330031.10 ppb
2014-11-1920125330041.30 ppb
2015-02-162016095001ND
2015-02-162016095002ND
2015-02-162016095003ND
2015-02-162016095004ND
2015-02-162016095001ND
2015-02-162016095002ND
2015-02-162016095003ND
2015-02-162016095004ND
2015-05-1920201470011.000 ppb
2015-05-192020147002ND
2015-05-1920201470031.10 ppb
2015-05-1920201470041.10 ppb
2015-05-1920201470011.000 ppb
2015-05-192020147002ND
2015-05-1920201470031.10 ppb
2015-05-1920201470041.10 ppb
2015-08-172024411001ND
2015-08-1720244110021.000 ppb
2015-08-1720244110031.10 ppb
2015-08-172024411004ND
2015-08-172024411001ND
2015-08-1720244110021.000 ppb
2015-08-1720244110031.10 ppb
2015-08-172024411004ND
2015-11-1620286590011.000 ppb
2015-11-1620286590021.20 ppb
2015-11-1620286590031.60 ppb
2015-11-1620286590041.40 ppb
2015-11-1620286590011.000 ppb
2015-11-1620286590021.20 ppb
2015-11-1620286590031.60 ppb
2015-11-1620286590041.40 ppb
2016-02-1520325530011.10 ppb
2016-02-1520325530021.30 ppb
2016-02-1520325530031.50 ppb
2016-02-1520325530042.20 ppb
2016-02-1520325530011.10 ppb
2016-02-1520325530021.30 ppb
2016-02-1520325530031.50 ppb
2016-02-1520325530042.20 ppb
2016-05-162036714001ND
2016-05-162036714002ND
2016-05-162036714003ND
2016-05-162036714004ND
2016-05-162036714001ND
2016-05-162036714002ND
2016-05-162036714003ND
2016-05-162036714004ND
2016-08-2920418720011.30 ppb
2016-08-2920418720021.70 ppb
2016-08-2920418720031.40 ppb
2016-08-2920418720041.40 ppb
2016-08-2920418720011.30 ppb
2016-08-2920418720021.70 ppb
2016-08-2920418720031.40 ppb
2016-08-2920418720041.40 ppb
2016-11-142045715001ND
2016-11-142045715002ND
2016-11-1420457150031.20 ppb
2016-11-1420457150041.000 ppb
2016-11-142045715001ND
2016-11-142045715002ND
2016-11-1420457150031.20 ppb
2016-11-1420457150041.000 ppb
2017-02-02352929630030.760 ppb
2017-02-02352929630040.740 ppb
2017-02-02352929630050.890 ppb
2017-02-02352929630061.000 ppb
2017-02-02352929630030.760 ppb
2017-02-02352929630040.740 ppb
2017-02-02352929630050.890 ppb
2017-02-02352929630061.000 ppb
2017-05-04353106070091.30 ppb
2017-05-04353106070101.90 ppb
2017-05-0435310607011ND
2017-05-04353106070121.30 ppb
2017-05-04353106070091.30 ppb
2017-05-04353106070101.90 ppb
2017-05-0435310607011ND
2017-05-04353106070121.30 ppb
2017-08-18353314250011.80 ppb
2017-08-18353314250021.62 ppb
2017-08-18353314250031.80 ppb
2017-08-18353314250041.58 ppb
2017-08-18353314250011.80 ppb
2017-08-18353314250021.62 ppb
2017-08-18353314250031.80 ppb
2017-08-18353314250041.58 ppb
2017-11-03353462420010.710 ppb
2017-11-03353462420020.490 ppb
2017-11-03353462420031.73 ppb
2017-11-03353462420040.540 ppb
2017-11-03353462420010.710 ppb
2017-11-03353462420020.490 ppb
2017-11-03353462420031.73 ppb
2017-11-03353462420040.540 ppb
2018-02-0235371907001ND
2018-02-0235371907002ND
2018-02-02353719070031.30 ppb
2018-02-0235371907004ND
2018-02-0235371907001ND
2018-02-0235371907002ND
2018-02-02353719070031.30 ppb
2018-02-0235371907004ND
2018-05-18353932310011.90 ppb
2018-05-18353932310021.90 ppb
2018-05-18353932310032.50 ppb
2018-05-183539323100431.5 ppb
2018-05-18353932310011.90 ppb
2018-05-18353932310021.90 ppb
2018-05-18353932310032.50 ppb
2018-05-183539323100431.5 ppb
2018-08-03354086630013.80 ppb
2018-08-03354086630024.00 ppb
2018-08-03354086630033.80 ppb
2018-08-03354086630043.50 ppb
2018-08-03354086630013.80 ppb
2018-08-03354086630024.00 ppb
2018-08-03354086630033.80 ppb
2018-08-03354086630043.50 ppb
2018-11-01354282040011.89 ppb
2018-11-01354282040022.50 ppb
2018-11-01354282040032.30 ppb
2018-11-01354282040042.30 ppb
2018-11-01354282040011.89 ppb
2018-11-01354282040022.50 ppb
2018-11-01354282040032.30 ppb
2018-11-01354282040042.30 ppb
2019-02-07354471240011.50 ppb
2019-02-07354471240021.30 ppb
2019-02-07354471240032.20 ppb
2019-02-07354471240041.70 ppb
2019-02-07354471240011.50 ppb
2019-02-07354471240021.30 ppb
2019-02-07354471240032.20 ppb
2019-02-07354471240041.70 ppb
2019-05-0835468287001ND
2019-05-08354682870022.40 ppb
2019-05-083546828700310.6 ppb
2019-05-08354682870041.10 ppb
2019-05-0835468287001ND
2019-05-08354682870022.40 ppb
2019-05-083546828700310.6 ppb
2019-05-08354682870041.10 ppb
2019-08-06354887330011.82 ppb
2019-08-06354887330022.20 ppb
2019-08-06354887330032.10 ppb
2019-08-06354887330040.800 ppb
2019-08-06354887330011.82 ppb
2019-08-06354887330022.20 ppb
2019-08-06354887330032.10 ppb
2019-08-06354887330040.800 ppb
2019-11-06355111000010.820 ppb
2019-11-06355111000020.950 ppb
2019-11-06355111000030.880 ppb
2019-11-06355111000040.910 ppb
2019-11-06355111000010.820 ppb
2019-11-06355111000020.950 ppb
2019-11-06355111000030.880 ppb
2019-11-06355111000040.910 ppb