Know Your Environment. Protect Your Health.

Haloacetic acids (HAA5)

St John Water District 3

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)

82

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20183.07 ppb3222ND - 20.4 ppb
20190.211 ppb3212ND - 0.860 ppb
20200.291 ppb169ND - 0.860 ppb
20210.538 ppb1611ND - 1.50 ppb
20221.39 ppb16160.660 ppb - 2.30 ppb
20230.890 ppb1612ND - 1.80 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
2018-03-1535380541001ND
2018-03-1535380541002ND
2018-03-1535380541003ND
2018-03-1535380541004ND
2018-03-1535380541001ND
2018-03-1535380541002ND
2018-03-1535380541003ND
2018-03-1535380541004ND
2018-06-14353986530010.700 ppb
2018-06-14353986530020.610 ppb
2018-06-14353986530030.620 ppb
2018-06-14353986530040.480 ppb
2018-06-14353986530010.700 ppb
2018-06-14353986530020.610 ppb
2018-06-14353986530030.620 ppb
2018-06-14353986530040.480 ppb
2018-09-06354161440010.530 ppb
2018-09-06354161440020.600 ppb
2018-09-06354161440030.410 ppb
2018-09-06354161440010.530 ppb
2018-09-06354161440020.600 ppb
2018-09-06354161440030.410 ppb
2018-09-2035419461001ND
2018-09-2035419461001ND
2018-12-10354363580012.30 ppb
2018-12-10354363580022.30 ppb
2018-12-103543635800320.1 ppb
2018-12-103543635800420.4 ppb
2018-12-10354363580012.30 ppb
2018-12-10354363580022.30 ppb
2018-12-103543635800320.1 ppb
2018-12-103543635800420.4 ppb
2019-03-1335454558001ND
2019-03-1335454558002ND
2019-03-1335454558003ND
2019-03-1335454558004ND
2019-03-1335454558001ND
2019-03-1335454558002ND
2019-03-1335454558003ND
2019-03-1335454558004ND
2019-06-11354752820010.360 ppb
2019-06-11354752820020.780 ppb
2019-06-11354752820030.720 ppb
2019-06-11354752820040.320 ppb
2019-06-11354752820010.360 ppb
2019-06-11354752820020.780 ppb
2019-06-11354752820030.720 ppb
2019-06-11354752820040.320 ppb
2019-09-12354975920010.330 ppb
2019-09-1235497592002ND
2019-09-12354975920030.860 ppb
2019-09-1235497592004ND
2019-09-12354975920010.330 ppb
2019-09-1235497592002ND
2019-09-12354975920030.860 ppb
2019-09-1235497592004ND
2019-12-0935517589001ND
2019-12-0935517589002ND
2019-12-0935517589003ND
2019-12-0935517589004ND
2019-12-0935517589001ND
2019-12-0935517589002ND
2019-12-0935517589003ND
2019-12-0935517589004ND
2020-03-11355370370010.860 ppb
2020-03-11355370370020.650 ppb
2020-03-11355370370030.720 ppb
2020-03-11355370370040.690 ppb
2020-06-11355562510010.310 ppb
2020-06-11355562510020.400 ppb
2020-06-1135556251003ND
2020-06-11355562510040.350 ppb
2020-09-0335575676001ND
2020-09-0335575676002ND
2020-09-0335575676003ND
2020-09-0335575676004ND
2020-12-1035598317001ND
2020-12-1035598317002ND
2020-12-10355983170030.290 ppb
2020-12-10355983170040.380 ppb
2021-03-1935620546001ND
2021-03-1935620546002ND
2021-03-1935620546003ND
2021-03-1935620546004ND
2021-06-30356444660010.370 ppb
2021-06-30356444660020.270 ppb
2021-06-30356444660030.550 ppb
2021-06-30356444660040.290 ppb
2021-09-24356671060010.620 ppb
2021-09-24356671060020.630 ppb
2021-09-2435667106003ND
2021-09-24356671060040.680 ppb
2021-12-21356863060011.50 ppb
2021-12-21356863060021.40 ppb
2021-12-21356863060031.20 ppb
2021-12-21356863060041.10 ppb
2022-03-10357029520011.40 ppb
2022-03-10357029520020.930 ppb
2022-03-10357029520030.710 ppb
2022-03-10357029520040.660 ppb
2022-07-25357342680011.30 ppb
2022-07-25357342680021.20 ppb
2022-07-25357342680032.30 ppb
2022-07-25357342680041.40 ppb
2022-09-07357450580011.000 ppb
2022-09-07357450580021.40 ppb
2022-09-07357450580031.50 ppb
2022-09-07357450580041.10 ppb
2022-12-01357634270012.30 ppb
2022-12-01357634270022.00 ppb
2022-12-01357634270031.70 ppb
2022-12-01357634270041.30 ppb
2023-03-16357866220011.30 ppb
2023-03-16357866220021.70 ppb
2023-03-16357866220031.70 ppb
2023-03-16357866220041.40 ppb
2023-06-21358083680011.10 ppb
2023-06-21358083680021.50 ppb
2023-06-21358083680041.80 ppb
2023-06-29358099520011.10 ppb
2023-09-1835828420001ND
2023-09-1835828420002ND
2023-09-1835828420003ND
2023-09-1835828420004ND
2023-12-27358505900010.650 ppb
2023-12-27358505900020.650 ppb
2023-12-27358505900030.730 ppb
2023-12-27358505900040.610 ppb