Dichloroacetic acid
CTWC - Naugatuck Region-Central System
Dichloroacetic acid, one of the group of five haloacetic acids regulated by federal standards, is formed when chlorine or other disinfectants are used to treat drinking water. Haloacetic acids and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.
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 | 5.03 ppb | 15 | 15 | 1.000 ppb - 13.0 ppb |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | 4.36 ppb | 16 | 16 | 2.30 ppb - 7.70 ppb |
| 2017 | 6.14 ppb | 16 | 16 | 1.70 ppb - 15.0 ppb |
| 2018 | 4.06 ppb | 16 | 13 | ND - 10.00 ppb |
| 2019 | 2.55 ppb | 16 | 13 | ND - 8.80 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.2 ppb
The EWG Health Guideline of 0.2 ppb for dichloroacetic acid was proposed in 2020 by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk.a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-02-25 | 2227HAA5 | 1.000 ppb |
| 2014-02-25 | 2228HAA5 | 12.0 ppb |
| 2014-02-25 | 2226HAA5 | 13.0 ppb |
| 2014-05-28 | 7179HAA5 | 5.00 ppb |
| 2014-05-28 | 7180HAA5 | 1.000 ppb |
| 2014-05-28 | 7181HAA5 | 5.00 ppb |
| 2014-05-28 | 7182HAA5 | 6.00 ppb |
| 2014-08-26 | BG99596HAA5 | 2.70 ppb |
| 2014-08-26 | BG99595HAA5 | 3.50 ppb |
| 2014-08-26 | BG99594HAA5 | 3.00 ppb |
| 2014-08-26 | BG99593HAA5 | 6.20 ppb |
| 2014-11-24 | BH45201HAA5 | 5.40 ppb |
| 2014-11-24 | BH45202HAA5 | 3.50 ppb |
| 2014-11-24 | BH45203HAA5 | 3.90 ppb |
| 2014-11-24 | BH45204HAA5 | 4.30 ppb |
| 2016-02-09 | BK63010HAA5 | 6.50 ppb |
| 2016-02-09 | BK63011HAA5 | 7.70 ppb |
| 2016-02-09 | BK63012HAA5 | 7.50 ppb |
| 2016-02-09 | BK63013HAA5 | 2.70 ppb |
| 2016-05-17 | BN33272HAA5 | 4.10 ppb |
| 2016-05-17 | BN33274HAA5 | 3.70 ppb |
| 2016-05-17 | BN33273HAA5 | 3.90 ppb |
| 2016-05-17 | BN33271HAA5 | 6.80 ppb |
| 2016-08-16 | BN92715HAA5 | 2.90 ppb |
| 2016-08-16 | BN92716HAA5 | 3.30 ppb |
| 2016-08-16 | BN92717HAA5 | 2.30 ppb |
| 2016-08-16 | BN92714HAA5 | 4.40 ppb |
| 2016-11-15 | BV83243HAA5 | 4.70 ppb |
| 2016-11-15 | BV83244HAA5 | 3.60 ppb |
| 2016-11-15 | BV83245HAA5 | 3.10 ppb |
| 2016-11-15 | BV83246HAA5 | 2.50 ppb |
| 2017-02-14 | BX61009HAA5 | 5.40 ppb |
| 2017-02-14 | BX61012HAA5 | 3.80 ppb |
| 2017-02-14 | BX61011HAA5 | 1.70 ppb |
| 2017-02-14 | BX61010HAA5 | 9.60 ppb |
| 2017-05-16 | BY21158HAA5 | 7.80 ppb |
| 2017-05-16 | BY21159HAA5 | 15.0 ppb |
| 2017-05-16 | BY21160HAA5 | 13.0 ppb |
| 2017-05-16 | BY21161HAA5 | 4.00 ppb |
| 2017-08-22 | BY88372HAA5 | 3.00 ppb |
| 2017-08-22 | BY88369HAA5 | 8.10 ppb |
| 2017-08-22 | BY88370HAA5 | 3.60 ppb |
| 2017-08-22 | BY88371HAA5 | 3.00 ppb |
| 2017-11-20 | BZ44481HAA5 | 4.80 ppb |
| 2017-11-20 | BZ44482HAA5 | 4.20 ppb |
| 2017-11-20 | BZ44483HAA5 | 2.80 ppb |
| 2017-11-20 | BZ44480HAA5 | 8.50 ppb |
| 2018-02-14 | BZ89697HAA5 | 8.70 ppb |
| 2018-02-14 | BZ89698HAA5 | 9.00 ppb |
| 2018-02-14 | BZ89699HAA5 | ND |
| 2018-02-14 | BZ89700HAA5 | 9.80 ppb |
| 2018-05-21 | CA50438HAA5 | 8.00 ppb |
| 2018-05-21 | CA50440HAA5 | 2.20 ppb |
| 2018-05-21 | CA50439HAA5 | 4.20 ppb |
| 2018-05-21 | CA50437HAA5 | 2.40 ppb |
| 2018-08-20 | CB14939 | 10.00 ppb |
| 2018-08-20 | CB14940 | 2.00 ppb |
| 2018-08-20 | CB14941 | 1.30 ppb |
| 2018-08-20 | CB14942 | 1.60 ppb |
| 2018-11-20 | DBP 200513534 | ND |
| 2018-11-20 | DBP 200513504 | ND |
| 2018-11-20 | DBP 200513502 | 0.800 ppb |
| 2018-11-20 | DBP 200513506 | 5.00 ppb |
| 2019-02-20 | DBP 200522447 | 8.80 ppb |
| 2019-02-20 | DBP 200522448 | 3.30 ppb |
| 2019-02-20 | DBP 200522449 | ND |
| 2019-02-20 | DBP 200522450 | 6.50 ppb |
| 2019-05-21 | DBP 200533260 | 3.10 ppb |
| 2019-05-21 | DBP 200533259 | 1.000 ppb |
| 2019-05-21 | DBP 200533258 | 1.70 ppb |
| 2019-05-21 | DBP 200533257 | 3.20 ppb |
| 2019-08-20 | DBP 200545890 | 1.50 ppb |
| 2019-08-20 | DBP 200545891 | 0.700 ppb |
| 2019-08-20 | DBP 200545892 | ND |
| 2019-08-20 | DBP 200545893 | 4.70 ppb |
| 2019-11-19 | DBP 200557404 | 1.000 ppb |
| 2019-11-19 | DBP 200557405 | 0.700 ppb |
| 2019-11-19 | DBP 200557406 | ND |
| 2019-11-19 | DBP 200557407 | 4.60 ppb |