Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Haloacetic acids (HAA5)

Desert Water Agency

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

 

176

Samples

0

Samples exceeding legal limit (MCL)

28

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20143.18 ppb3211ND - 45.8 ppb
20151.13 ppb323ND - 20.9 ppb
20161.92 ppb325ND - 40.1 ppb
20170.831 ppb326ND - 10.7 ppb
20181.000 ppb162ND - 14.0 ppb
20191.28 ppb321ND - 41.0 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 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
2014-03-123761-801-09001.10 ppb
2014-03-123761-802-09401.000 ppb
2014-03-123761-803-100537.1 ppb
2014-03-123761-804-1035ND
2014-03-123761-805-1110ND
2014-03-123761-806-1140ND
2014-03-123761-807-1215ND
2014-03-123761-808-0800ND
2014-06-113761-801-09151.10 ppb
2014-06-113761-802-09451.30 ppb
2014-06-113761-803-101545.8 ppb
2014-06-113761-804-10451.000 ppb
2014-06-113761-805-1145ND
2014-06-113761-806-1245ND
2014-06-113761-807-1215ND
2014-06-113761-808-1115ND
2014-09-103761-801-0930ND
2014-09-103761-802-1015ND
2014-09-103761-803-1045ND
2014-09-103761-804-1145ND
2014-09-103761-805-1215ND
2014-09-103761-806-1315ND
2014-09-103761-807-1245ND
2014-09-103761-808-1115ND
2014-12-103761-801-07451.10 ppb
2014-12-103761-802-08452.70 ppb
2014-12-103761-803-09108.40 ppb
2014-12-103761-804-1010ND
2014-12-103761-805-1035ND
2014-12-103761-806-1145ND
2014-12-103761-807-1115ND
2014-12-103761-808-09401.20 ppb
2015-03-113761-801-0920ND
2015-03-113761-802-09505.50 ppb
2015-03-113761-803-101520.9 ppb
2015-03-113761-804-1110ND
2015-03-113761-805-1135ND
2015-03-113761-806-1230ND
2015-03-113761-807-1200ND
2015-03-113761-808-1045ND
2015-06-103761-801-0925ND
2015-06-103761-802-1010ND
2015-06-103761-803-1030ND
2015-06-103761-804-1100ND
2015-06-103761-805-1125ND
2015-06-103761-806-1150ND
2015-06-103761-807-1220ND
2015-06-103761-808-1255ND
2015-09-083761-801-0930ND
2015-09-083761-802-1015ND
2015-09-083761-803-1045ND
2015-09-083761-804-1115ND
2015-09-083761-805-1330ND
2015-09-083761-806-1550ND
2015-09-083761-807-1500ND
2015-09-083761-808-1415ND
2015-12-093761-801-1110ND
2015-12-093761-802-09409.60 ppb
2015-12-093761-803-1020ND
2015-12-093761-804-0815ND
2015-12-093761-805-1020ND
2015-12-093761-806-0740ND
2015-12-093761-807-0925ND
2015-12-093761-808-0900ND
2016-03-073761-801-1240ND
2016-03-073761-805-1000ND
2016-03-073761-807-0930ND
2016-03-093761-802-1100ND
2016-03-093761-803-113510.3 ppb
2016-03-093761-804-0940ND
2016-03-093761-806-0910ND
2016-03-093761-808-1015ND
2016-06-073761-801-1430ND
2016-06-073761-804-1145ND
2016-06-073761-805-1040ND
2016-06-073761-806-1005ND
2016-06-073761-807-0925ND
2016-06-083761-802-11008.70 ppb
2016-06-083761-803-1145ND
2016-06-083761-808-1215ND
2016-09-143761-801-0915ND
2016-09-143761-802-0950ND
2016-09-143761-803-1015ND
2016-09-143761-804-1105ND
2016-09-143761-805-1130ND
2016-09-143761-806-1145ND
2016-09-143761-807-1210ND
2016-09-143761-808-1045ND
2016-12-073761-801-13301.20 ppb
2016-12-073761-802-1430ND
2016-12-073761-803-150040.1 ppb
2016-12-083761-804-0930ND
2016-12-083761-805-1000ND
2016-12-083761-806-10251.20 ppb
2016-12-083761-807-1115ND
2016-12-083761-808-0900ND
2017-03-093761-801-0950ND
2017-03-093761-802-1100ND
2017-03-093761-803-1130ND
2017-03-093761-804-1245ND
2017-03-093761-805-1345ND
2017-03-093761-806-1425ND
2017-03-093761-807-1500ND
2017-03-093761-808-1315ND
2017-06-123761-801-1345ND
2017-06-123761-805-1430ND
2017-06-123761-807-1105ND
2017-06-133761-804-0955ND
2017-06-133761-806-1035ND
2017-06-143761-802-095510.7 ppb
2017-06-143761-803-10356.20 ppb
2017-06-143761-808-1120ND
2017-09-133761-801-09201.000 ppb
2017-09-133761-802-09554.90 ppb
2017-09-133761-803-1030ND
2017-09-133761-804-1130ND
2017-09-133761-805-1200ND
2017-09-133761-806-1315ND
2017-09-133761-807-1235ND
2017-09-133761-808-1100ND
2017-12-153761-801-08452.80 ppb
2017-12-153761-802-09101.000 ppb
2017-12-153761-803-0935ND
2017-12-153761-804-1020ND
2017-12-153761-805-1040ND
2017-12-153761-806-1100ND
2017-12-153761-807-1130ND
2017-12-153761-808-1000ND
2018-06-123761-801-09472.00 ppb
2018-06-123761-802-1042ND
2018-06-123761-803-1148ND
2018-06-123761-808-1224ND
2018-06-133761-804-0900ND
2018-06-133761-805-0935ND
2018-06-133761-806-1014ND
2018-06-133761-807-1049ND
2018-12-124790-801-0745ND
2018-12-124790-802-0815ND
2018-12-124790-803-084514.0 ppb
2018-12-124790-804-0945ND
2018-12-124790-805-1015ND
2018-12-124790-806-1140ND
2018-12-124790-807-1100ND
2018-12-124790-808-0915ND
2019-03-074790-801-0805ND
2019-03-074790-802-0830ND
2019-03-074790-803-0740ND
2019-03-074790-804-0930ND
2019-03-074790-805-1000ND
2019-03-074790-806-0955ND
2019-03-074790-807-1100ND
2019-03-074790-808-0900ND
2019-06-274790-801-0855ND
2019-06-274790-802-092541.0 ppb
2019-06-274790-803-1000ND
2019-06-274790-804-1055ND
2019-06-274790-805-1125ND
2019-06-274790-806-1145ND
2019-06-274790-807-1215ND
2019-06-274790-808-1025ND
2019-09-124790-801-1415ND
2019-09-124790-802-1330ND
2019-09-124790-803-1300ND
2019-09-124790-804-1100ND
2019-09-124790-805-1020ND
2019-09-124790-806-0930ND
2019-09-124790-807-0830ND
2019-09-124790-808-1210ND
2019-12-124790-801-0830ND
2019-12-124790-802-0945ND
2019-12-124790-803-1010ND
2019-12-124790-804-1125ND
2019-12-124790-805-1150ND
2019-12-124790-806-1345ND
2019-12-124790-807-1300ND
2019-12-124790-808-1045ND