Know Your Environment. Protect Your Health.

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.

 

128

Samples

0

Samples exceeding legal limit (MCL)

107

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20183.95 ppb3226ND - 31.5 ppb
20191.96 ppb3230ND - 10.6 ppb
20201.02 ppb1614ND - 1.45 ppb
20210.638 ppb1611ND - 1.60 ppb
20221.44 ppb16160.760 ppb - 2.80 ppb
20230.477 ppb1610ND - 1.70 ppb

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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
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
2020-02-04355293520011.40 ppb
2020-02-04355293520021.44 ppb
2020-02-04355293520031.42 ppb
2020-02-04355293520041.45 ppb
2020-05-1235550484001ND
2020-05-12355504840020.270 ppb
2020-05-12355504840030.400 ppb
2020-05-1235550484004ND
2020-08-04355692380010.800 ppb
2020-08-04355692380021.35 ppb
2020-08-04355692380031.24 ppb
2020-08-04355692380041.17 ppb
2020-11-04355905220011.24 ppb
2020-11-04355905220021.33 ppb
2020-11-04355905220031.41 ppb
2020-11-04355905220041.41 ppb
2021-02-0135610064001ND
2021-02-01356100640020.470 ppb
2021-02-01356100640030.500 ppb
2021-02-01356100640040.510 ppb
2021-05-03356316880010.940 ppb
2021-05-03356316880021.000 ppb
2021-05-03356316880031.20 ppb
2021-05-03356316880041.000 ppb
2021-08-0535653948001ND
2021-08-0535653948002ND
2021-08-0535653948003ND
2021-08-0535653948004ND
2021-11-03356764170010.660 ppb
2021-11-03356764170020.830 ppb
2021-11-03356764170031.60 ppb
2021-11-03356764170041.50 ppb
2022-02-17356983730012.50 ppb
2022-02-17356983730022.80 ppb
2022-02-17356983730032.40 ppb
2022-02-17356983730041.56 ppb
2022-05-09357174130011.70 ppb
2022-05-09357174130021.20 ppb
2022-05-09357174130031.20 ppb
2022-05-09357174130041.20 ppb
2022-08-10357390700010.930 ppb
2022-08-10357390700020.820 ppb
2022-08-10357390700030.930 ppb
2022-08-10357390700040.760 ppb
2022-11-03357577160012.60 ppb
2022-11-03357577160020.780 ppb
2022-11-03357577160030.930 ppb
2022-11-03357577160040.780 ppb
2023-02-02357767370010.270 ppb
2023-02-02357767370020.540 ppb
2023-02-02357767370030.710 ppb
2023-02-02357767370040.610 ppb
2023-05-0435797439001ND
2023-05-04357974390020.670 ppb
2023-05-04357974390030.630 ppb
2023-05-04357974390040.650 ppb
2023-08-0235817723001ND
2023-08-02358177230021.70 ppb
2023-08-02358177230031.10 ppb
2023-08-02358177230040.750 ppb
2023-11-0735840526001ND
2023-11-0735840526002ND
2023-11-0735840526003ND
2023-11-0735840526004ND