Monochloroacetic acid
California Water Service (CWS) - Los Altos Suburban
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.
200
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | 0.191 ppb | 32 | 2 | ND - 4.00 ppb |
| 2019 | ND | 32 | 0 | ND |
| 2020 | ND | 32 | 0 | ND |
| 2021 | ND | 32 | 0 | ND |
| 2022 | ND | 40 | 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 |
|---|---|---|
| 2018-02-13 | CA4310001_DST_902-201802131321 | ND |
| 2018-02-13 | CA4310001_DST_907-201802131425 | ND |
| 2018-02-13 | CA4310001_DST_901-201802131131 | ND |
| 2018-02-13 | CA4310001_DST_906-201802131259 | ND |
| 2018-02-14 | CA4310001_DST_903-201802141629 | ND |
| 2018-02-14 | CA4310001_DST_904-201802141646 | ND |
| 2018-02-14 | CA4310001_DST_905-201802141735 | ND |
| 2018-02-14 | CA4310001_DST_900-201802141713 | ND |
| 2018-05-15 | CA4310001_DST_906-201805150926 | 4.00 ppb |
| 2018-05-15 | CA4310001_DST_901-201805151605 | ND |
| 2018-05-15 | CA4310001_DST_903-201805151539 | ND |
| 2018-05-15 | CA4310001_DST_905-201805151351 | ND |
| 2018-05-15 | CA4310001_DST_902-201805151009 | ND |
| 2018-05-15 | CA4310001_DST_904-201805151505 | ND |
| 2018-05-15 | CA4310001_DST_900-201805151435 | ND |
| 2018-05-15 | CA4310001_DST_907-201805151415 | 2.10 ppb |
| 2018-08-14 | CA4310001_DST_903-201808141120 | ND |
| 2018-08-14 | CA4310001_DST_905-201808140905 | ND |
| 2018-08-14 | CA4310001_DST_900-201808140940 | ND |
| 2018-08-14 | CA4310001_DST_904-201808141100 | ND |
| 2018-08-14 | CA4310001_DST_906-201808141030 | ND |
| 2018-08-14 | CA4310001_DST_901-201808141135 | ND |
| 2018-08-14 | CA4310001_DST_902-201808141010 | ND |
| 2018-08-14 | CA4310001_DST_907-201808140920 | ND |
| 2018-11-15 | CA4310001_DST_900-201811151305 | ND |
| 2018-11-15 | CA4310001_DST_904-201811151335 | ND |
| 2018-11-15 | CA4310001_DST_901-201811151425 | ND |
| 2018-11-15 | CA4310001_DST_902-201811151120 | ND |
| 2018-11-15 | CA4310001_DST_903-201811151400 | ND |
| 2018-11-15 | CA4310001_DST_905-201811151145 | ND |
| 2018-11-15 | CA4310001_DST_906-201811151230 | ND |
| 2018-11-15 | CA4310001_DST_907-201811151205 | ND |
| 2019-02-12 | CA4310001_DST_907-201902121220 | ND |
| 2019-02-12 | CA4310001_DST_902-201902121245 | ND |
| 2019-02-12 | CA4310001_DST_901-201902121625 | ND |
| 2019-02-12 | CA4310001_DST_906-201902121335 | ND |
| 2019-02-13 | CA4310001_DST_900-201902131032 | ND |
| 2019-02-13 | CA4310001_DST_903-201902130949 | ND |
| 2019-02-13 | CA4310001_DST_905-201902131059 | ND |
| 2019-02-13 | CA4310001_DST_904-201902131146 | ND |
| 2019-05-14 | CA4310001_DST_907-201905141508 | ND |
| 2019-05-14 | CA4310001_DST_901-201905141429 | ND |
| 2019-05-14 | CA4310001_DST_902-201905141539 | ND |
| 2019-05-14 | CA4310001_DST_903-201905141403 | ND |
| 2019-05-14 | CA4310001_DST_905-201905141450 | ND |
| 2019-05-14 | CA4310001_DST_906-201905141556 | ND |
| 2019-05-14 | CA4310001_DST_904-201905141343 | ND |
| 2019-05-14 | CA4310001_DST_900-201905141516 | ND |
| 2019-08-13 | CA4310001_DST_902-201908131227 | ND |
| 2019-08-13 | CA4310001_DST_903-201908131423 | ND |
| 2019-08-13 | CA4310001_DST_904-201908131506 | ND |
| 2019-08-13 | CA4310001_DST_906-201908131241 | ND |
| 2019-08-13 | CA4310001_DST_900-201908131211 | ND |
| 2019-08-13 | CA4310001_DST_901-201908131455 | ND |
| 2019-08-13 | CA4310001_DST_905-201908131138 | ND |
| 2019-08-13 | CA4310001_DST_907-201908131200 | ND |
| 2019-11-14 | CA4310001_DST_902-201911141248 | ND |
| 2019-11-14 | CA4310001_DST_906-201911141233 | ND |
| 2019-11-14 | CA4310001_DST_901-201911141127 | ND |
| 2019-11-14 | CA4310001_DST_907-201911141336 | ND |
| 2019-11-14 | CA4310001_DST_900-201911141352 | ND |
| 2019-11-14 | CA4310001_DST_903-201911141104 | ND |
| 2019-11-14 | CA4310001_DST_904-201911141030 | ND |
| 2019-11-14 | CA4310001_DST_905-201911141423 | ND |
| 2020-02-12 | CA4310001_DST_904-202002121500 | ND |
| 2020-02-12 | CA4310001_DST_907-202002121155 | ND |
| 2020-02-12 | CA4310001_DST_900-202002121205 | ND |
| 2020-02-12 | CA4310001_DST_901-202002121725 | ND |
| 2020-02-12 | CA4310001_DST_905-202002121130 | ND |
| 2020-02-12 | CA4310001_DST_906-202002121245 | ND |
| 2020-02-12 | CA4310001_DST_902-202002121225 | ND |
| 2020-02-12 | CA4310001_DST_903-202002121650 | ND |
| 2020-05-13 | CA4310001_DST_903-202005131330 | ND |
| 2020-05-13 | CA4310001_DST_902-202005130745 | ND |
| 2020-05-13 | CA4310001_DST_906-202005130825 | ND |
| 2020-05-13 | CA4310001_DST_900-202005131030 | ND |
| 2020-05-13 | CA4310001_DST_901-202005131250 | ND |
| 2020-05-13 | CA4310001_DST_905-202005130945 | ND |
| 2020-05-13 | CA4310001_DST_907-202005130905 | ND |
| 2020-05-13 | CA4310001_DST_904-202005131140 | ND |
| 2020-08-12 | CA4310001_DST_901-202008121319 | ND |
| 2020-08-12 | CA4310001_DST_902-202008121338 | ND |
| 2020-08-12 | CA4310001_DST_905-202008121443 | ND |
| 2020-08-12 | CA4310001_DST_900-202008121524 | ND |
| 2020-08-12 | CA4310001_DST_904-202008121323 | ND |
| 2020-08-12 | CA4310001_DST_907-202008121500 | ND |
| 2020-08-12 | CA4310001_DST_903-202008121301 | ND |
| 2020-08-12 | CA4310001_DST_906-202008121552 | ND |
| 2020-11-09 | CA4310001_DST_901-202011091610 | ND |
| 2020-11-09 | CA4310001_DST_900-202011091235 | ND |
| 2020-11-09 | CA4310001_DST_906-202011091135 | ND |
| 2020-11-09 | CA4310001_DST_904-202011091445 | ND |
| 2020-11-09 | CA4310001_DST_905-202011091340 | ND |
| 2020-11-09 | CA4310001_DST_907-202011091310 | ND |
| 2020-11-09 | CA4310001_DST_902-202011091210 | ND |
| 2020-11-09 | CA4310001_DST_903-202011091510 | ND |
| 2021-02-11 | CA4310001_DST_907-202102110828 | ND |
| 2021-02-11 | CA4310001_DST_905-202102110750 | ND |
| 2021-02-11 | CA4310001_DST_902-202102110945 | ND |
| 2021-02-11 | CA4310001_DST_903-202102111140 | ND |
| 2021-02-11 | CA4310001_DST_906-202102111010 | ND |
| 2021-02-11 | CA4310001_DST_900-202102110915 | ND |
| 2021-02-11 | CA4310001_DST_901-202102111208 | ND |
| 2021-02-11 | CA4310001_DST_904-202102111055 | ND |
| 2021-05-11 | CA4310001_DST_900-202105111357 | ND |
| 2021-05-11 | CA4310001_DST_901-202105111115 | ND |
| 2021-05-11 | CA4310001_DST_904-202105111201 | ND |
| 2021-05-11 | CA4310001_DST_903-202105111128 | ND |
| 2021-05-11 | CA4310001_DST_906-202105111257 | ND |
| 2021-05-11 | CA4310001_DST_902-202105111238 | ND |
| 2021-05-11 | CA4310001_DST_905-202105111333 | ND |
| 2021-05-11 | CA4310001_DST_907-202105111422 | ND |
| 2021-08-12 | CA4310001_DST_901-202108121442 | ND |
| 2021-08-12 | CA4310001_DST_904-202108121338 | ND |
| 2021-08-12 | CA4310001_DST_902-202108121117 | ND |
| 2021-08-12 | CA4310001_DST_903-202108121410 | ND |
| 2021-08-12 | CA4310001_DST_906-202108121140 | ND |
| 2021-08-12 | CA4310001_DST_907-202108121210 | ND |
| 2021-08-12 | CA4310001_DST_900-202108121231 | ND |
| 2021-08-12 | CA4310001_DST_905-202108121303 | ND |
| 2021-11-09 | CA4310001_DST_900-202111091446 | ND |
| 2021-11-09 | CA4310001_DST_905-202111091506 | ND |
| 2021-11-09 | CA4310001_DST_906-202111091310 | ND |
| 2021-11-09 | CA4310001_DST_901-202111091000 | ND |
| 2021-11-09 | CA4310001_DST_903-202111091114 | ND |
| 2021-11-09 | CA4310001_DST_902-202111091245 | ND |
| 2021-11-09 | CA4310001_DST_904-202111091201 | ND |
| 2021-11-09 | CA4310001_DST_907-202111091110 | ND |
| 2022-02-16 | CA4310001_DST_900-202202161255 | ND |
| 2022-02-16 | CA4310001_DST_904-202202161523 | ND |
| 2022-02-16 | CA4310001_DST_901-202202161622 | ND |
| 2022-02-16 | CA4310001_DST_903-202202161555 | ND |
| 2022-02-16 | CA4310001_DST_906-202202161128 | ND |
| 2022-02-16 | CA4310001_DST_907-202202161337 | ND |
| 2022-02-16 | CA4310001_DST_902-202202161209 | ND |
| 2022-02-16 | CA4310001_DST_905-202202161436 | ND |
| 2022-05-11 | CA4310001_DST_901-202205111426 | ND |
| 2022-05-11 | CA4310001_DST_907-202205111120 | ND |
| 2022-05-11 | CA4310001_DST_900-202205111042 | ND |
| 2022-05-11 | CA4310001_DST_902-202205110901 | ND |
| 2022-05-11 | CA4310001_DST_904-202205111346 | ND |
| 2022-05-11 | CA4310001_DST_906-202205110949 | ND |
| 2022-05-11 | CA4310001_DST_907-202205111120 | ND |
| 2022-05-11 | CA4310001_DST_902-202205110901 | ND |
| 2022-05-11 | CA4310001_DST_903-202205111455 | ND |
| 2022-05-11 | CA4310001_DST_901-202205111426 | ND |
| 2022-05-11 | CA4310001_DST_905-202205111147 | ND |
| 2022-05-11 | CA4310001_DST_906-202205110949 | ND |
| 2022-05-25 | CA4310001_DST_904-202205251100 | ND |
| 2022-05-25 | CA4310001_DST_905-202205251300 | ND |
| 2022-05-25 | CA4310001_DST_900-202205251350 | ND |
| 2022-05-25 | CA4310001_DST_903-202205251040 | ND |
| 2022-08-10 | CA4310001_DST_902-202208101258 | ND |
| 2022-08-10 | CA4310001_DST_901-202208101025 | ND |
| 2022-08-10 | CA4310001_DST_903-202208101001 | ND |
| 2022-08-10 | CA4310001_DST_905-202208101137 | ND |
| 2022-08-10 | CA4310001_DST_900-202208101235 | ND |
| 2022-08-10 | CA4310001_DST_904-202208101106 | ND |
| 2022-08-10 | CA4310001_DST_906-202208101320 | ND |
| 2022-08-10 | CA4310001_DST_907-202208101204 | ND |
| 2022-11-09 | CA4310001_DST_902-202211091248 | ND |
| 2022-11-09 | CA4310001_DST_903-202211091114 | ND |
| 2022-11-09 | CA4310001_DST_901-202211091147 | ND |
| 2022-11-09 | CA4310001_DST_904-202211091046 | ND |
| 2022-11-09 | CA4310001_DST_905-202211090939 | ND |
| 2022-11-09 | CA4310001_DST_907-202211091323 | ND |
| 2022-11-09 | CA4310001_DST_906-202211091420 | ND |
| 2022-11-09 | CA4310001_DST_900-202211091000 | ND |
| 2023-02-13 | CA4310001_DST_901-202302131048 | ND |
| 2023-02-13 | CA4310001_DST_905-202302131405 | ND |
| 2023-02-13 | CA4310001_DST_907-202302131344 | ND |
| 2023-02-13 | CA4310001_DST_903-202302131144 | ND |
| 2023-02-13 | CA4310001_DST_900-202302131332 | ND |
| 2023-02-13 | CA4310001_DST_902-202302131257 | ND |
| 2023-02-13 | CA4310001_DST_904-202302131020 | ND |
| 2023-02-13 | CA4310001_DST_906-202302131240 | ND |
| 2023-05-10 | CA4310001_DST_901-202305101130 | ND |
| 2023-05-10 | CA4310001_DST_902-202305101251 | ND |
| 2023-05-10 | CA4310001_DST_900-202305100945 | ND |
| 2023-05-10 | CA4310001_DST_904-202305101020 | ND |
| 2023-05-10 | CA4310001_DST_906-202305101319 | ND |
| 2023-05-10 | CA4310001_DST_907-202305101357 | ND |
| 2023-05-10 | CA4310001_DST_903-202305101057 | ND |
| 2023-05-10 | CA4310001_DST_905-202305100915 | ND |
| 2023-08-16 | CA4310001_DST_900-202308161401 | ND |
| 2023-08-16 | CA4310001_DST_902-202308160945 | ND |
| 2023-08-16 | CA4310001_DST_903-202308161305 | ND |
| 2023-08-16 | CA4310001_DST_907-202308161014 | ND |
| 2023-08-16 | CA4310001_DST_901-202308161137 | ND |
| 2023-08-16 | CA4310001_DST_905-202308161432 | ND |
| 2023-08-16 | CA4310001_DST_906-202308161054 | ND |
| 2023-08-16 | CA4310001_DST_904-202308161334 | ND |
| 2023-11-14 | CA4310001_DST_900-202311141240 | ND |
| 2023-11-14 | CA4310001_DST_902-202311141250 | ND |
| 2023-11-14 | CA4310001_DST_904-202311141410 | ND |
| 2023-11-14 | CA4310001_DST_906-202311141350 | ND |
| 2023-11-14 | CA4310001_DST_903-202311141435 | ND |
| 2023-11-14 | CA4310001_DST_905-202311141205 | ND |
| 2023-11-14 | CA4310001_DST_907-202311141225 | ND |
| 2023-11-14 | CA4310001_DST_901-202311141455 | ND |