Haloacetic acids (HAA5)
Avon Water Company
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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | 1.56 ppb | 16 | 14 | ND - 3.30 ppb |
| 2019 | 1.39 ppb | 16 | 15 | ND - 3.10 ppb |
| 2020 | 1.51 ppb | 16 | 15 | ND - 4.30 ppb |
| 2021 | 1.98 ppb | 17 | 15 | ND - 10.6 ppb |
| 2022 | 1.32 ppb | 16 | 9 | ND - 5.90 ppb |
| 2023 | 1.96 ppb | 16 | 11 | ND - 4.80 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 |
|---|---|---|
| 2018-01-24 | D8A1669-02HA5 | 1.60 ppb |
| 2018-01-24 | D8A1669-03HA5 | 2.30 ppb |
| 2018-01-24 | D8A1669-04HA5 | 1.000 ppb |
| 2018-01-24 | D8A1669-01HA5 | 2.20 ppb |
| 2018-04-25 | D8D2151-09HA5 | 3.30 ppb |
| 2018-04-25 | D8D2151-10HA5 | 2.00 ppb |
| 2018-04-25 | D8D2151-11HA5 | 1.90 ppb |
| 2018-04-25 | D8D2151-08HA5 | ND |
| 2018-07-26 | CA98743 | ND |
| 2018-07-26 | CA98744 | 2.80 ppb |
| 2018-07-26 | CA98745 | 1.70 ppb |
| 2018-07-26 | CA98746 | 2.30 ppb |
| 2018-10-09 | DBP 200508665 | 0.800 ppb |
| 2018-10-09 | DBP 200508678 | 1.10 ppb |
| 2018-10-09 | DBP 200508676 | 1.20 ppb |
| 2018-10-09 | DBP 200508664 | 0.800 ppb |
| 2019-01-08 | DBP 200518131 | 0.600 ppb |
| 2019-01-08 | DBP 200518132 | ND |
| 2019-01-08 | DBP 200518133 | 0.500 ppb |
| 2019-01-08 | DBP 200518135 | 0.500 ppb |
| 2019-04-11 | DBP 200528267 | 0.900 ppb |
| 2019-04-11 | DBP 200528268 | 3.10 ppb |
| 2019-04-11 | DBP 200528269 | 1.20 ppb |
| 2019-04-11 | DBP 200528270 | 1.90 ppb |
| 2019-07-02 | DBP 200538993 | 2.90 ppb |
| 2019-07-02 | DBP 200538996 | 2.30 ppb |
| 2019-07-02 | DBP 200538995 | 1.80 ppb |
| 2019-07-02 | DBP 200538992 | 0.500 ppb |
| 2019-10-03 | DBP 200551430 | 2.00 ppb |
| 2019-10-03 | DBP 200551431 | 1.50 ppb |
| 2019-10-03 | DBP 200551432 | 2.10 ppb |
| 2019-10-03 | DBP 200551429 | 0.500 ppb |
| 2020-01-09 | DBP 200562755 | ND |
| 2020-01-09 | DBP 200562756 | 1.30 ppb |
| 2020-01-09 | DBP 200562757 | 1.30 ppb |
| 2020-01-09 | DBP 200562758 | 1.000 ppb |
| 2020-04-16 | DBP 200572928 | 1.70 ppb |
| 2020-04-16 | DBP 200572929 | 2.30 ppb |
| 2020-04-16 | DBP 200572927 | 2.10 ppb |
| 2020-04-16 | DBP 200572926 | 0.600 ppb |
| 2020-07-20 | DBP 200583413 | 0.500 ppb |
| 2020-07-20 | DBP 200583414 | 3.40 ppb |
| 2020-07-20 | DBP 200583415 | 1.40 ppb |
| 2020-07-20 | DBP 200583416 | 2.60 ppb |
| 2020-10-21 | DBP 200595044 | 0.500 ppb |
| 2020-10-21 | DBP 200595045 | 4.30 ppb |
| 2020-10-21 | DBP 200595046 | 0.600 ppb |
| 2020-10-21 | DBP 200595047 | 0.600 ppb |
| 2021-01-07 | DBP 200603406 | 1.90 ppb |
| 2021-01-07 | DBP 200603402 | 1.40 ppb |
| 2021-01-07 | DBP 200603404 | 1.50 ppb |
| 2021-01-07 | DBP 200603405 | 1.70 ppb |
| 2021-01-08 | DBP 200603409 | 10.6 ppb |
| 2021-04-15 | DBP 200613652 | 0.600 ppb |
| 2021-04-15 | DBP 200613653 | 2.00 ppb |
| 2021-04-15 | DBP 200613654 | 1.90 ppb |
| 2021-04-15 | DBP 200613655 | 1.90 ppb |
| 2021-07-01 | DBP 200623334 | ND |
| 2021-07-01 | DBP 200623335 | 0.500 ppb |
| 2021-07-01 | DBP 200623336 | 2.10 ppb |
| 2021-07-01 | DBP 200623338 | 2.10 ppb |
| 2021-10-12 | H300079407 300079433 | 1.93 ppb |
| 2021-10-12 | H300079409 300079435 | ND |
| 2021-10-12 | H300079408 300079434 | 1.78 ppb |
| 2021-10-12 | H300079406 300079432 | 1.68 ppb |
| 2022-01-14 | CK17779 | ND |
| 2022-01-14 | CK17780 | ND |
| 2022-01-14 | CK17781 | ND |
| 2022-01-18 | CK17774 | ND |
| 2022-04-15 | CL11166 | ND |
| 2022-04-15 | CL11167 | 1.70 ppb |
| 2022-04-15 | CL11168 | 1.70 ppb |
| 2022-04-15 | CL11169 | 2.00 ppb |
| 2022-07-08 | CL75309 | ND |
| 2022-07-08 | CL75312 | 2.70 ppb |
| 2022-07-08 | CL75310 | 5.90 ppb |
| 2022-07-08 | CL75311 | 2.90 ppb |
| 2022-10-21 | CM69248 | 1.30 ppb |
| 2022-10-21 | CM69249 | 1.80 ppb |
| 2022-10-21 | CM69250 | 1.10 ppb |
| 2022-10-21 | CM69251 | ND |
| 2023-01-11 | CN21964 | ND |
| 2023-01-12 | CN24188 | 2.60 ppb |
| 2023-01-12 | CN24189 | 3.10 ppb |
| 2023-01-12 | CN24190 | 1.20 ppb |
| 2023-04-14 | CN85863 | 1.40 ppb |
| 2023-04-14 | CN85865 | 2.70 ppb |
| 2023-04-14 | CN85864 | 4.60 ppb |
| 2023-04-14 | CN85862 | ND |
| 2023-07-13 | CO53041 | ND |
| 2023-07-13 | CO53042 | 2.90 ppb |
| 2023-07-13 | CO53043 | 4.80 ppb |
| 2023-07-25 | CO58855 | 4.40 ppb |
| 2023-10-04 | CP17807 | ND |
| 2023-10-04 | CP17808 | 2.00 ppb |
| 2023-10-04 | CP17809 | 1.60 ppb |
| 2023-10-04 | CP17810 | ND |