Haloacetic acids (HAA5)

Town of Queen Creek

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

124

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2013	N/A	0	0	N/A
2014	1.54 ppb	20	14	ND - 4.80 ppb
2015	0.503 ppb	32	8	ND - 4.60 ppb
2016	0.792 ppb	24	8	ND - 11.0 ppb
2017	1.14 ppb	16	9	ND - 4.60 ppb
2018	ND	16	0	ND
2019	ND	16	0	ND

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
2014-02-06	550-19081-1	1.000 ppb
2014-02-06	550-19081-2	1.10 ppb
2014-02-06	550-19081-3	1.20 ppb
2014-02-06	550-19081-4	1.70 ppb
2014-05-07	550-24127-1	ND
2014-05-07	550-24127-2	ND
2014-05-07	550-24127-3	ND
2014-05-07	550-24127-4	1.10 ppb
2014-08-06	550-29260-1	ND
2014-08-06	550-29260-2	ND
2014-08-06	550-29260-3	1.20 ppb
2014-08-06	550-29260-4	2.60 ppb
2014-11-05	550-34550-1	1.000 ppb
2014-11-05	550-34550-2	4.80 ppb
2014-11-05	550-34550-3	4.10 ppb
2014-11-05	550-34550-4	4.10 ppb
2014-11-05	550-34551-1	0.1000 ppb
2014-11-05	550-34551-2	3.50 ppb
2014-11-05	550-34551-3	ND
2014-11-06	550-34597-1	3.30 ppb
2015-02-04	550-39506-1	1.40 ppb
2015-02-04	550-39506-2	ND
2015-02-04	550-39506-3	3.50 ppb
2015-02-04	550-39506-4	4.60 ppb
2015-02-04	550-39506-5	1.10 ppb
2015-02-04	550-39506-6	ND
2015-02-04	550-39506-7	ND
2015-02-04	550-39506-8	ND
2015-05-06	550-44293-1	ND
2015-05-06	550-44293-2	ND
2015-05-06	550-44293-3	ND
2015-05-06	550-44293-4	1.80 ppb
2015-05-06	550-44293-5	ND
2015-05-06	550-44293-6	ND
2015-05-06	550-44293-7	ND
2015-05-06	550-44293-8	ND
2015-08-05	3294139	ND
2015-08-05	3294140	ND
2015-08-05	3294141	ND
2015-08-05	3294142	1.000 ppb
2015-08-05	3294143	ND
2015-08-05	3294144	ND
2015-08-05	3294145	ND
2015-08-05	3294146	ND
2015-11-04	550-53750-1	1.10 ppb
2015-11-04	550-53750-2	ND
2015-11-04	550-53750-3	ND
2015-11-04	550-53750-4	1.60 ppb
2015-11-04	550-53750-5	ND
2015-11-04	550-53750-6	ND
2015-11-04	550-53750-7	ND
2015-11-04	550-53750-8	ND
2016-02-03	550-58210-1	1.10 ppb
2016-02-03	550-58210-2	1.000 ppb
2016-02-03	550-58210-3	1.000 ppb
2016-02-03	550-58210-4	1.20 ppb
2016-02-03	550-58210-5	ND
2016-02-03	550-58210-6	ND
2016-02-03	550-58210-7	ND
2016-02-03	550-58210-8	ND
2016-05-04	550-62879	ND
2016-05-04	550-62879-1	ND
2016-05-04	550-62879-3	1.000 ppb
2016-05-04	550-62879-4	1.30 ppb
2016-05-04	550-62879-5	ND
2016-05-04	550-62879-6	11.0 ppb
2016-05-04	550-62879-7	ND
2016-05-04	550-62879-8	ND
2016-08-03	550-67346-1	ND
2016-08-03	550-67346-2	1.40 ppb
2016-08-03	550-67346-3	ND
2016-08-03	550-67346-4	ND
2016-11-01	550-72144-1	ND
2016-11-01	550-72144-2	ND
2016-11-01	550-72144-3	ND
2016-11-01	550-72144-4	ND
2017-02-01	550-76707-1	ND
2017-02-01	550-76707-2	ND
2017-02-01	550-76707-3	ND
2017-02-01	550-76707-4	ND
2017-05-03	550-82104-1	1.20 ppb
2017-05-03	550-82104-2	1.90 ppb
2017-05-03	550-82104-3	1.000 ppb
2017-05-03	550-82104-4	4.60 ppb
2017-08-02	558978-001	ND
2017-08-02	558978-002	0.145 ppb
2017-08-02	558978-003	ND
2017-08-02	558978-004	ND
2017-11-01	567030-001	2.45 ppb
2017-11-01	567030-002	4.35 ppb
2017-11-01	567030-003	1.28 ppb
2017-11-01	567030-004	1.24 ppb
2018-02-08	575788-002	ND
2018-02-08	575788-004	ND
2018-02-08	575788-006	ND
2018-02-08	575788-008	ND
2018-05-09	585332-001	ND
2018-05-09	585332-002	ND
2018-05-09	585332-003	ND
2018-05-09	585332-004	ND
2018-08-01	594278-001	ND
2018-08-01	594278-002	ND
2018-08-01	594278-003	ND
2018-08-01	594278-004	ND
2018-11-01	604060-001	ND
2018-11-01	604060-002	ND
2018-11-01	604060-003	ND
2018-11-01	604060-004	ND
2019-01-30	612764-001	ND
2019-01-30	612764-002	ND
2019-01-30	612764-003	ND
2019-01-30	612764-004	ND
2019-04-30	4278153	ND
2019-04-30	4278155	ND
2019-04-30	4278157	ND
2019-04-30	4278159	ND
2019-07-31	4372589	ND
2019-07-31	4372591	ND
2019-07-31	4372593	ND
2019-07-31	4372595	ND
2019-10-30	4473268	ND
2019-10-30	4473270	ND
2019-10-30	4473272	ND
2019-10-30	4473274	ND