Haloacetic acids (HAA5)
CTWC - Naugatuck Region-Central System
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | 10.7 ppb | 15 | 15 | 4.00 ppb - 22.0 ppb |
| 2015 | 14.8 ppb | 16 | 16 | 4.90 ppb - 23.6 ppb |
| 2016 | 9.96 ppb | 16 | 16 | 2.30 ppb - 16.0 ppb |
| 2017 | 14.7 ppb | 16 | 16 | 3.00 ppb - 33.0 ppb |
| 2018 | 11.0 ppb | 16 | 16 | 1.30 ppb - 23.0 ppb |
| 2019 | 7.91 ppb | 16 | 16 | 2.50 ppb - 22.1 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 |
|---|---|---|
| 2014-02-25 | 2227HAA5 | 4.00 ppb |
| 2014-02-25 | 2228HAA5 | 22.0 ppb |
| 2014-02-25 | 2226HAA5 | 19.0 ppb |
| 2014-05-28 | 7179HAA5 | 7.00 ppb |
| 2014-05-28 | 7180HAA5 | 5.00 ppb |
| 2014-05-28 | 7181HAA5 | 10.00 ppb |
| 2014-05-28 | 7182HAA5 | 11.0 ppb |
| 2014-08-26 | BG99593HAA5 | 12.0 ppb |
| 2014-08-26 | BG99594HAA5 | 9.00 ppb |
| 2014-08-26 | BG99595HAA5 | 8.20 ppb |
| 2014-08-26 | BG99596HAA5 | 8.00 ppb |
| 2014-11-24 | BH45202HAA5 | 10.7 ppb |
| 2014-11-24 | BH45204HAA5 | 12.8 ppb |
| 2014-11-24 | BH45203HAA5 | 11.7 ppb |
| 2014-11-24 | BH45201HAA5 | 9.60 ppb |
| 2015-02-27 | BH78479HAA5 | 15.8 ppb |
| 2015-02-27 | BH78478HAA5 | 12.4 ppb |
| 2015-02-27 | BH78481HAA5 | 23.6 ppb |
| 2015-02-27 | BH78480HAA5 | 12.8 ppb |
| 2015-05-26 | BJ21442HAA5 | 13.4 ppb |
| 2015-05-26 | BJ21443HAA5 | 22.0 ppb |
| 2015-05-26 | BJ21445HAA5 | 18.0 ppb |
| 2015-05-26 | BJ21444HAA5 | 15.0 ppb |
| 2015-08-18 | BJ76636HAA5 | 4.90 ppb |
| 2015-08-18 | BJ76634HAA5 | 7.00 ppb |
| 2015-08-18 | BJ76633HAA5 | 14.0 ppb |
| 2015-08-18 | BJ76635HAA5 | 10.00 ppb |
| 2015-11-09 | BK20856HAA5 | 16.1 ppb |
| 2015-11-09 | BK20859HAA5 | 12.5 ppb |
| 2015-11-09 | BK20858HAA5 | 20.0 ppb |
| 2015-11-09 | BK20857HAA5 | 20.0 ppb |
| 2016-02-09 | BK63010HAA5 | 13.1 ppb |
| 2016-02-09 | BK63011HAA5 | 15.2 ppb |
| 2016-02-09 | BK63012HAA5 | 16.0 ppb |
| 2016-02-09 | BK63013HAA5 | 11.0 ppb |
| 2016-05-17 | BN33273HAA5 | 13.4 ppb |
| 2016-05-17 | BN33274HAA5 | 11.6 ppb |
| 2016-05-17 | BN33272HAA5 | 12.0 ppb |
| 2016-05-17 | BN33271HAA5 | 13.0 ppb |
| 2016-08-16 | BN92714HAA5 | 9.50 ppb |
| 2016-08-16 | BN92715HAA5 | 4.80 ppb |
| 2016-08-16 | BN92716HAA5 | 10.00 ppb |
| 2016-08-16 | BN92717HAA5 | 2.30 ppb |
| 2016-11-15 | BV83243HAA5 | 9.00 ppb |
| 2016-11-15 | BV83244HAA5 | 8.40 ppb |
| 2016-11-15 | BV83245HAA5 | 7.50 ppb |
| 2016-11-15 | BV83246HAA5 | 2.50 ppb |
| 2017-02-14 | BX61012HAA5 | 13.2 ppb |
| 2017-02-14 | BX61009HAA5 | 11.1 ppb |
| 2017-02-14 | BX61010HAA5 | 21.0 ppb |
| 2017-02-14 | BX61011HAA5 | 6.80 ppb |
| 2017-05-16 | BY21159HAA5 | 33.0 ppb |
| 2017-05-16 | BY21160HAA5 | 28.0 ppb |
| 2017-05-16 | BY21161HAA5 | 18.0 ppb |
| 2017-05-16 | BY21158HAA5 | 16.2 ppb |
| 2017-08-22 | BY88369HAA5 | 17.9 ppb |
| 2017-08-22 | BY88370HAA5 | 6.00 ppb |
| 2017-08-22 | BY88371HAA5 | 6.00 ppb |
| 2017-08-22 | BY88372HAA5 | 3.00 ppb |
| 2017-11-20 | BZ44483HAA5 | 4.20 ppb |
| 2017-11-20 | BZ44482HAA5 | 19.0 ppb |
| 2017-11-20 | BZ44481HAA5 | 12.2 ppb |
| 2017-11-20 | BZ44480HAA5 | 20.0 ppb |
| 2018-02-14 | BZ89697HAA5 | 16.8 ppb |
| 2018-02-14 | BZ89698HAA5 | 23.0 ppb |
| 2018-02-14 | BZ89699HAA5 | 1.50 ppb |
| 2018-02-14 | BZ89700HAA5 | 20.0 ppb |
| 2018-05-21 | CA50437HAA5 | 10.00 ppb |
| 2018-05-21 | CA50438HAA5 | 20.0 ppb |
| 2018-05-21 | CA50439HAA5 | 20.0 ppb |
| 2018-05-21 | CA50440HAA5 | 15.0 ppb |
| 2018-08-20 | CB14942 | 1.60 ppb |
| 2018-08-20 | CB14940 | 5.00 ppb |
| 2018-08-20 | CB14939 | 20.0 ppb |
| 2018-08-20 | CB14941 | 4.70 ppb |
| 2018-11-20 | DBP 200513502 | 3.80 ppb |
| 2018-11-20 | DBP 200513504 | 1.60 ppb |
| 2018-11-20 | DBP 200513506 | 11.2 ppb |
| 2018-11-20 | DBP 200513534 | 1.30 ppb |
| 2019-02-20 | DBP 200522447 | 22.1 ppb |
| 2019-02-20 | DBP 200522448 | 12.4 ppb |
| 2019-02-20 | DBP 200522449 | 2.50 ppb |
| 2019-02-20 | DBP 200522450 | 12.2 ppb |
| 2019-05-21 | DBP 200533258 | 6.30 ppb |
| 2019-05-21 | DBP 200533260 | 5.30 ppb |
| 2019-05-21 | DBP 200533259 | 5.10 ppb |
| 2019-05-21 | DBP 200533257 | 8.70 ppb |
| 2019-08-20 | DBP 200545890 | 7.30 ppb |
| 2019-08-20 | DBP 200545891 | 4.90 ppb |
| 2019-08-20 | DBP 200545892 | 4.10 ppb |
| 2019-08-20 | DBP 200545893 | 9.90 ppb |
| 2019-11-19 | DBP 200557404 | 7.90 ppb |
| 2019-11-19 | DBP 200557405 | 4.60 ppb |
| 2019-11-19 | DBP 200557406 | 4.00 ppb |
| 2019-11-19 | DBP 200557407 | 9.30 ppb |