Monochloroacetic acid
Danbury Water Department
Monochloroacetic 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 |
|---|---|---|---|---|
| 2018 | 0.0938 ppb | 32 | 5 | ND - 0.700 ppb |
| 2019 | 0.378 ppb | 32 | 18 | ND - 1.000 ppb |
| 2020 | 0.400 ppb | 32 | 17 | ND - 1.50 ppb |
| 2021 | 0.513 ppb | 16 | 12 | ND - 1.20 ppb |
| 2022 | ND | 24 | 0 | ND |
| 2023 | ND | 32 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 53 ppb
The EWG Health Guideline of 53 ppb for monochloroacetic acid was defined by the California Office of Environmental Health Hazard Assessment's public health goal, the level of a drinking water contaminant that does not pose a significant health risk.a public health goal. This health guideline protects against change to fetal growth and development.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-03-14 | 211599GE | ND |
| 2018-03-14 | 211585GE | ND |
| 2018-03-14 | 211587GE | ND |
| 2018-03-14 | 211589GE | ND |
| 2018-03-14 | 211591GE | ND |
| 2018-03-15 | 211593GE | ND |
| 2018-03-15 | 211595GE | ND |
| 2018-03-15 | 211597GE | ND |
| 2018-06-19 | 215751GE | ND |
| 2018-06-19 | 215737GE | ND |
| 2018-06-19 | 215739GE | ND |
| 2018-06-19 | 215743GE | ND |
| 2018-06-19 | 215745GE | ND |
| 2018-06-20 | 215747GE | ND |
| 2018-06-20 | 215749GE | ND |
| 2018-06-20 | 215741GE | ND |
| 2018-09-14 | DBP 200505484 | ND |
| 2018-09-14 | DBP 200505486 | 0.600 ppb |
| 2018-09-14 | DBP 200505491 | ND |
| 2018-09-14 | DBP 200505493 | ND |
| 2018-09-14 | DBP 200505495 | ND |
| 2018-09-14 | DBP 200505497 | 0.600 ppb |
| 2018-09-14 | DBP 200505499 | ND |
| 2018-09-17 | DBP 200505658 | ND |
| 2018-12-14 | DBP 200516093 | ND |
| 2018-12-14 | DBP 200516094 | ND |
| 2018-12-14 | DBP 200516095 | ND |
| 2018-12-14 | DBP 200516096 | ND |
| 2018-12-14 | DBP 200516097 | 0.500 ppb |
| 2018-12-14 | DBP 200516098 | ND |
| 2018-12-14 | DBP 200516099 | 0.600 ppb |
| 2018-12-14 | DBP 200516100 | 0.700 ppb |
| 2019-03-14 | DBP 200524760 | 0.500 ppb |
| 2019-03-14 | DBP 200524761 | ND |
| 2019-03-14 | DBP 200524762 | ND |
| 2019-03-14 | DBP 200524763 | 0.600 ppb |
| 2019-03-14 | DBP 200524764 | 0.600 ppb |
| 2019-03-14 | DBP 200524765 | 0.700 ppb |
| 2019-03-14 | DBP 200524766 | 0.800 ppb |
| 2019-03-14 | DBP 200524767 | 0.700 ppb |
| 2019-06-20 | DBP 200537265 | ND |
| 2019-06-20 | DBP 200537266 | 0.500 ppb |
| 2019-06-20 | DBP 200537267 | 0.500 ppb |
| 2019-06-20 | DBP 200537268 | ND |
| 2019-06-20 | DBP 200537269 | 0.700 ppb |
| 2019-06-20 | DBP 200537270 | 1.000 ppb |
| 2019-06-20 | DBP 200537271 | ND |
| 2019-06-20 | DBP 200537272 | 0.600 ppb |
| 2019-09-19 | DBP 200549612 | ND |
| 2019-09-19 | DBP 200549613 | 0.600 ppb |
| 2019-09-19 | DBP 200549615 | ND |
| 2019-09-19 | DBP 200549617 | ND |
| 2019-09-19 | DBP 200549618 | ND |
| 2019-10-11 | DBP 200552503 | 0.700 ppb |
| 2019-10-11 | DBP 200552504 | 0.900 ppb |
| 2019-10-11 | DBP 200552505 | 1.000 ppb |
| 2019-12-19 | DBP 200560926 | ND |
| 2019-12-19 | DBP 200560927 | ND |
| 2019-12-19 | DBP 200560929 | ND |
| 2019-12-19 | DBP 200560930 | 0.600 ppb |
| 2019-12-19 | DBP 200560931 | 0.600 ppb |
| 2019-12-19 | DBP 200560932 | ND |
| 2019-12-19 | DBP 200560934 | ND |
| 2019-12-19 | DBP 200560935 | 0.500 ppb |
| 2020-03-19 | DBP 200569976 | ND |
| 2020-03-19 | DBP 200569977 | ND |
| 2020-03-19 | DBP 200569978 | 0.600 ppb |
| 2020-03-19 | DBP 200569979 | ND |
| 2020-03-19 | DBP 200569980 | 0.700 ppb |
| 2020-03-19 | DBP 200569981 | ND |
| 2020-03-19 | DBP 200569982 | 0.800 ppb |
| 2020-03-19 | DBP 200569983 | 0.600 ppb |
| 2020-06-18 | DBP 200579794 | ND |
| 2020-06-18 | DBP 200579795 | 0.600 ppb |
| 2020-06-18 | DBP 200579796 | 0.600 ppb |
| 2020-06-18 | DBP 200579797 | ND |
| 2020-06-18 | DBP 200579798 | 0.700 ppb |
| 2020-06-18 | DBP 200579799 | 0.700 ppb |
| 2020-06-18 | DBP 200579800 | ND |
| 2020-06-18 | DBP 200579801 | 0.800 ppb |
| 2020-09-17 | DBP 200590661 | ND |
| 2020-09-17 | DBP 200590662 | 0.700 ppb |
| 2020-09-17 | DBP 200590663 | ND |
| 2020-09-17 | DBP 200590664 | ND |
| 2020-09-17 | DBP 200590665 | 0.800 ppb |
| 2020-09-17 | DBP 200590666 | 0.600 ppb |
| 2020-09-17 | DBP 200590667 | ND |
| 2020-09-17 | DBP 200590668 | ND |
| 2020-12-18 | DBP 200601598 | ND |
| 2020-12-18 | DBP 200601599 | ND |
| 2020-12-18 | DBP 200601600 | 0.600 ppb |
| 2020-12-18 | DBP 200601601 | ND |
| 2020-12-18 | DBP 200601602 | 0.900 ppb |
| 2020-12-18 | DBP 200601603 | 0.800 ppb |
| 2020-12-18 | DBP 200601604 | 0.800 ppb |
| 2020-12-18 | DBP 200601605 | 1.50 ppb |
| 2021-03-18 | DBP 200610316 | 0.600 ppb |
| 2021-03-18 | DBP 200610317 | ND |
| 2021-03-18 | DBP 200610318 | 0.500 ppb |
| 2021-03-18 | DBP 200610319 | 0.600 ppb |
| 2021-03-18 | DBP 200610320 | ND |
| 2021-03-18 | DBP 200610321 | 0.800 ppb |
| 2021-03-18 | DBP 200610322 | 0.800 ppb |
| 2021-03-18 | DBP 200610323 | 0.500 ppb |
| 2021-06-17 | DBP 200621341 | ND |
| 2021-06-17 | DBP 200621342 | 0.700 ppb |
| 2021-06-17 | DBP 200621343 | ND |
| 2021-06-17 | DBP 200621344 | 0.600 ppb |
| 2021-06-17 | DBP 200621345 | 0.600 ppb |
| 2021-06-17 | DBP 200621346 | 0.700 ppb |
| 2021-06-17 | DBP 200621347 | 0.600 ppb |
| 2021-06-17 | DBP 200621348 | 1.20 ppb |
| 2022-06-14 | 288297 | ND |
| 2022-06-14 | 288299 | ND |
| 2022-06-14 | 288303 | ND |
| 2022-06-14 | 288305 | ND |
| 2022-06-15 | 288301 | ND |
| 2022-06-15 | 288291 | ND |
| 2022-06-15 | 288293 | ND |
| 2022-06-15 | 288295 | ND |
| 2022-09-14 | 296290 | ND |
| 2022-09-15 | 296292 | ND |
| 2022-09-15 | 296294 | ND |
| 2022-09-15 | 296296 | ND |
| 2022-09-15 | 296298 | ND |
| 2022-09-15 | 296300 | ND |
| 2022-09-15 | 296302 | ND |
| 2022-09-15 | 296308 | ND |
| 2022-12-13 | 303028 | ND |
| 2022-12-13 | 303031 | ND |
| 2022-12-13 | 303035 | ND |
| 2022-12-13 | 303037 | ND |
| 2022-12-13 | 303039 | ND |
| 2022-12-14 | 303033 | ND |
| 2022-12-15 | 303024 | ND |
| 2022-12-15 | 303026 | ND |
| 2023-03-06 | 307813 | ND |
| 2023-03-07 | 307811 | ND |
| 2023-03-07 | 307812 | ND |
| 2023-03-07 | 307817 | ND |
| 2023-03-07 | 307818 | ND |
| 2023-03-07 | 307814 | ND |
| 2023-03-07 | 307816 | ND |
| 2023-03-08 | 307815 | ND |
| 2023-06-06 | N3F0423-01 | ND |
| 2023-06-06 | N3F0423-03 | ND |
| 2023-06-06 | N3F0423-06 | ND |
| 2023-06-06 | N3F0423-08 | ND |
| 2023-06-07 | N3F0423-07 | ND |
| 2023-06-07 | N3F0423-04 | ND |
| 2023-06-07 | N3F0423-02 | ND |
| 2023-06-08 | N3F0423-05 | ND |
| 2023-09-12 | CO99982 | ND |
| 2023-09-12 | CO99983 | ND |
| 2023-09-12 | CO99989 | ND |
| 2023-09-13 | CO99986 | ND |
| 2023-09-13 | CO99987 | ND |
| 2023-09-13 | CO99988 | ND |
| 2023-09-14 | CO99984 | ND |
| 2023-09-14 | CO99985 | ND |
| 2023-12-11 | CP68213 | ND |
| 2023-12-12 | CP68214 | ND |
| 2023-12-12 | CP68211 | ND |
| 2023-12-12 | CP68212 | ND |
| 2023-12-12 | CP68216 | ND |
| 2023-12-12 | CP68217 | ND |
| 2023-12-12 | CP68218 | ND |
| 2023-12-13 | CP68215 | ND |