Know Your Environment. Protect Your Health.

Haloacetic acids (HAA5)

Haciendas Del Norte Water Improvement Di

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.

 

48

Samples

0

Samples exceeding legal limit (MCL)

22

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201814.2 ppb85ND - 32.4 ppb
20198.28 ppb84ND - 19.0 ppb
202013.4 ppb84ND - 30.0 ppb
202111.0 ppb82ND - 44.3 ppb
20228.98 ppb82ND - 36.0 ppb
20238.99 ppb85ND - 34.7 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
2018-01-10Q1801266003ND
2018-01-10Q1801266002ND
2018-04-03Q181399100220.2 ppb
2018-04-03Q181399100121.6 ppb
2018-07-12Q182776800132.4 ppb
2018-07-12Q182776800230.1 ppb
2018-10-31Q1843805001ND
2018-10-31Q18438050028.90 ppb
2019-01-22Q1903665001ND
2019-01-22Q1903665003ND
2019-05-14Q1925475001ND
2019-05-14Q1925475002ND
2019-08-23Q195976300217.0 ppb
2019-08-23Q195976300115.2 ppb
2019-10-28Q197457800115.0 ppb
2019-10-28Q197457800219.0 ppb
2020-01-30Q2003941001ND
2020-01-30Q2003941002ND
2020-04-15Q201496600123.5 ppb
2020-04-15Q201496600228.3 ppb
2020-07-16Q202800700125.3 ppb
2020-07-16Q202800700230.0 ppb
2020-11-17Q2045543001ND
2020-11-17Q2045543002ND
2021-01-06Q2100407002ND
2021-01-06Q2100407003ND
2021-04-15Q2109772001ND
2021-04-15Q2109772002ND
2021-07-21Q211912000143.7 ppb
2021-07-21Q211912000244.3 ppb
2021-11-04Q2130989001ND
2021-11-04Q2130989002ND
2022-01-13Q2201439002ND
2022-01-13Q2201439003ND
2022-04-20Q2212103001ND
2022-04-20Q2212103002ND
2022-07-29Q222232300135.8 ppb
2022-07-29Q222232300236.0 ppb
2022-11-02Q2233266001ND
2022-11-02Q2233266002ND
2023-02-13Q2305506002ND
2023-02-13Q2305506003ND
2023-05-18Q23187830011.60 ppb
2023-05-18Q23187830021.50 ppb
2023-08-08Q233226300134.7 ppb
2023-08-08Q233226300232.9 ppb
2023-11-13Q2348418001ND
2023-11-13Q23484180021.20 ppb