Monochloroacetic acid
Metropolitan District Commission
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 | 0.0563 ppb | 48 | 4 | ND - 0.800 ppb |
| 2019 | ND | 48 | 0 | ND |
| 2020 | 0.0542 ppb | 48 | 4 | ND - 0.800 ppb |
| 2021 | 0.0875 ppb | 48 | 7 | ND - 0.700 ppb |
| 2022 | 0.123 ppb | 48 | 7 | ND - 1.08 ppb |
| 2023 | 0.402 ppb | 48 | 22 | ND - 1.80 ppb |
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 |
|---|---|---|
| 2018-03-05 | AD89780GE | ND |
| 2018-03-05 | AD89784GE | ND |
| 2018-03-06 | AD89785GE | ND |
| 2018-03-06 | AD89781GE | ND |
| 2018-03-06 | AD89782GE | ND |
| 2018-03-06 | AD89783GE | ND |
| 2018-03-06 | AD89779GE | ND |
| 2018-03-06 | AD89776GE | ND |
| 2018-03-06 | AD89777GE | ND |
| 2018-03-08 | AD89786GE | ND |
| 2018-03-08 | AD89787GE | ND |
| 2018-03-09 | AD89778GE | ND |
| 2018-06-11 | DBP 200497717 | ND |
| 2018-06-11 | DBP 200497716 | ND |
| 2018-06-12 | DBP 200497718 | 0.800 ppb |
| 2018-06-12 | DBP 200497719 | 0.600 ppb |
| 2018-06-12 | DBP 200497720 | ND |
| 2018-06-13 | DBP 200497721 | 0.700 ppb |
| 2018-06-13 | DBP 200497722 | ND |
| 2018-06-13 | DBP 200497723 | 0.600 ppb |
| 2018-06-13 | DBP 200497724 | ND |
| 2018-06-14 | DBP 200497725 | ND |
| 2018-06-14 | DBP 200497726 | ND |
| 2018-06-15 | DBP 200497727 | ND |
| 2018-09-05 | AE06391GE | ND |
| 2018-09-05 | AE06392GE | ND |
| 2018-09-05 | AE06396GE | ND |
| 2018-09-05 | AE06397GE | ND |
| 2018-09-06 | AE06399GE | ND |
| 2018-09-06 | AE06400GE | ND |
| 2018-09-06 | AE06401GE | ND |
| 2018-09-06 | AE06402GE | ND |
| 2018-09-06 | AE06394GE | ND |
| 2018-09-07 | AE06395GE | ND |
| 2018-09-07 | AE06393GE | ND |
| 2018-09-07 | AE06398GE | ND |
| 2018-12-03 | AE14334GE | ND |
| 2018-12-03 | AE14329GE | ND |
| 2018-12-03 | AE14330GE | ND |
| 2018-12-04 | AE14335GE | ND |
| 2018-12-04 | AE14333GE | ND |
| 2018-12-05 | AE14326GE | ND |
| 2018-12-05 | AE14327GE | ND |
| 2018-12-05 | AE14331GE | ND |
| 2018-12-05 | AE14332GE | ND |
| 2018-12-06 | AE14336GE | ND |
| 2018-12-06 | AE14337GE | ND |
| 2018-12-07 | AE14328GE | ND |
| 2019-03-11 | AE22328GE | ND |
| 2019-03-11 | AE22324GE | ND |
| 2019-03-12 | AE22323GE | ND |
| 2019-03-12 | AE22329GE | ND |
| 2019-03-12 | AE22327GE | ND |
| 2019-03-13 | AE22325GE | ND |
| 2019-03-13 | AE22326GE | ND |
| 2019-03-13 | AE22320GE | ND |
| 2019-03-13 | AE22321GE | ND |
| 2019-03-14 | AE22330GE | ND |
| 2019-03-14 | AE22331GE | ND |
| 2019-03-15 | AE22322GE | ND |
| 2019-06-03 | AE30192GE | ND |
| 2019-06-03 | AE30196GE | ND |
| 2019-06-04 | AE30197GE | ND |
| 2019-06-04 | AE30191GE | ND |
| 2019-06-04 | AE30195GE | ND |
| 2019-06-05 | AE30188GE | ND |
| 2019-06-05 | AE30189GE | ND |
| 2019-06-05 | AE30193GE | ND |
| 2019-06-05 | AE30194GE | ND |
| 2019-06-06 | AE30198GE | ND |
| 2019-06-06 | AE30199GE | ND |
| 2019-06-07 | AE30190GE | ND |
| 2019-09-09 | DBP 200548825 | ND |
| 2019-09-09 | DBP 200548826 | ND |
| 2019-09-10 | DBP 200548827 | ND |
| 2019-09-10 | DBP 200548829 | ND |
| 2019-09-10 | DBP 200548828 | ND |
| 2019-09-10 | DBP 200548830 | ND |
| 2019-09-11 | DBP 200548831 | ND |
| 2019-09-11 | DBP 200548832 | ND |
| 2019-09-11 | DBP 200548833 | ND |
| 2019-09-12 | DBP 200548834 | ND |
| 2019-09-12 | DBP 200548835 | ND |
| 2019-09-13 | DBP 200548836 | ND |
| 2019-12-02 | DBP 200559256 | ND |
| 2019-12-02 | DBP 200559255 | ND |
| 2019-12-03 | DBP 200559257 | ND |
| 2019-12-03 | DBP 200559258 | ND |
| 2019-12-03 | DBP 200559259 | ND |
| 2019-12-04 | DBP 200559260 | ND |
| 2019-12-04 | DBP 200559261 | ND |
| 2019-12-04 | DBP 200559262 | ND |
| 2019-12-04 | DBP 200559263 | ND |
| 2019-12-05 | DBP 200559264 | ND |
| 2019-12-05 | DBP 200559265 | ND |
| 2019-12-06 | DBP 200559266 | ND |
| 2020-03-02 | AE52330GE | ND |
| 2020-03-02 | AE52331GE | ND |
| 2020-03-02 | AE52332GE | ND |
| 2020-03-02 | AE52333GE | ND |
| 2020-03-02 | AE52334GE | ND |
| 2020-03-02 | AE52335GE | ND |
| 2020-03-02 | AE52336GE | ND |
| 2020-03-03 | AE53110GE | ND |
| 2020-03-03 | AE53111GE | ND |
| 2020-03-03 | AE53112GE | ND |
| 2020-03-03 | AE53113GE | ND |
| 2020-03-03 | AE53114GE | ND |
| 2020-06-01 | AE60029GE | ND |
| 2020-06-01 | AE60030GE | ND |
| 2020-06-01 | AE60033GE | ND |
| 2020-06-01 | AE60034GE | ND |
| 2020-06-01 | AE60035GE | ND |
| 2020-06-01 | AE60037GE | ND |
| 2020-06-01 | AE60038GE | ND |
| 2020-06-02 | AE60039GE | ND |
| 2020-06-02 | AE60040GE | ND |
| 2020-06-02 | AE60036GE | ND |
| 2020-06-02 | AE60031GE | ND |
| 2020-06-02 | AE60032GE | ND |
| 2020-09-08 | AE67031GE | ND |
| 2020-09-08 | AE67032GE | ND |
| 2020-09-08 | AE67035GE | ND |
| 2020-09-08 | AE67036GE | ND |
| 2020-09-08 | AE67037GE | ND |
| 2020-09-08 | AE67038GE | 0.600 ppb |
| 2020-09-09 | AE67033GE | ND |
| 2020-09-09 | AE67034GE | 0.800 ppb |
| 2020-09-09 | AE67028GE | ND |
| 2020-09-09 | AE67029GE | ND |
| 2020-09-10 | AE67030GE | ND |
| 2020-09-10 | AE67039GE | ND |
| 2020-12-01 | AE73075GE | ND |
| 2020-12-01 | AE73076GE | ND |
| 2020-12-01 | AE73077GE | 0.600 ppb |
| 2020-12-01 | AE73078GE | ND |
| 2020-12-01 | AE73081GE | ND |
| 2020-12-01 | AE73082GE | 0.600 ppb |
| 2020-12-01 | AE73083GE | ND |
| 2020-12-01 | AE73084GE | ND |
| 2020-12-01 | AE73085GE | ND |
| 2020-12-01 | AE73086GE | ND |
| 2020-12-01 | AE73087GE | ND |
| 2020-12-01 | AE73088GE | ND |
| 2021-03-01 | AE79601GE | 0.600 ppb |
| 2021-03-01 | AE79604GE | ND |
| 2021-03-02 | AE79687GE | 0.600 ppb |
| 2021-03-02 | AE79692GE | ND |
| 2021-03-02 | AE79694GE | 0.600 ppb |
| 2021-03-03 | AE79775GE | 0.700 ppb |
| 2021-03-03 | AE79776GE | ND |
| 2021-03-03 | AE79779GE | 0.700 ppb |
| 2021-03-03 | AE79780GE | ND |
| 2021-03-03 | AE79821GE | 0.500 ppb |
| 2021-03-03 | AE79822GE | ND |
| 2021-03-04 | AE79871GE | 0.500 ppb |
| 2021-06-01 | AE86386GE | ND |
| 2021-06-01 | AE86387GE | ND |
| 2021-06-01 | AE86388GE | ND |
| 2021-06-01 | AE86389GE | ND |
| 2021-06-01 | AE86390GE | ND |
| 2021-06-01 | AE86392GE | ND |
| 2021-06-01 | AE86393GE | ND |
| 2021-06-02 | AE86482GE | ND |
| 2021-06-02 | AE86484GE | ND |
| 2021-06-02 | AE86485GE | ND |
| 2021-06-02 | AE86487GE | ND |
| 2021-06-02 | AE86489GE | ND |
| 2021-09-07 | AE94495GE | ND |
| 2021-09-07 | AE94496GE | ND |
| 2021-09-07 | AE94499GE | ND |
| 2021-09-07 | AE94500GE | ND |
| 2021-09-07 | AE94501GE | ND |
| 2021-09-07 | AE94502GE | ND |
| 2021-09-08 | AE94503GE | ND |
| 2021-09-08 | AE94497GE | ND |
| 2021-09-08 | AE94498GE | ND |
| 2021-09-08 | AE94492GE | ND |
| 2021-09-08 | AE94493GE | ND |
| 2021-09-08 | AE94494GE | ND |
| 2021-12-07 | AF01258GE | ND |
| 2021-12-07 | AF01259GE | ND |
| 2021-12-07 | AF01262GE | ND |
| 2021-12-07 | AF01264GE | ND |
| 2021-12-08 | AF01260GE | ND |
| 2021-12-08 | AF01255GE | ND |
| 2021-12-08 | AF01261GE | ND |
| 2021-12-09 | AF01263GE | ND |
| 2021-12-09 | AF01265GE | ND |
| 2021-12-09 | AF01266GE | ND |
| 2021-12-10 | AF01256GE | ND |
| 2021-12-10 | AF01257GE | ND |
| 2022-03-07 | AF07835GE | ND |
| 2022-03-07 | AF07839GE | ND |
| 2022-03-08 | AF07834GE | ND |
| 2022-03-08 | AF07840GE | ND |
| 2022-03-08 | AF07838GE | ND |
| 2022-03-09 | AF07836GE | ND |
| 2022-03-09 | AF07837GE | ND |
| 2022-03-09 | AF07831GE | ND |
| 2022-03-10 | AF07841GE | ND |
| 2022-03-10 | AF07842GE | ND |
| 2022-03-11 | AF07832GE | ND |
| 2022-03-11 | AF07833GE | ND |
| 2022-06-06 | AF13657GE | 0.830 ppb |
| 2022-06-06 | AF13658GE | ND |
| 2022-06-06 | AF13659GE | ND |
| 2022-06-06 | AF13660GE | ND |
| 2022-06-06 | AF13661GE | 0.570 ppb |
| 2022-06-06 | AF13662GE | 0.830 ppb |
| 2022-06-06 | AF13663GE | 1.08 ppb |
| 2022-06-06 | AF13664GE | 1.06 ppb |
| 2022-06-06 | AF13665GE | ND |
| 2022-06-06 | AF13666GE | 0.900 ppb |
| 2022-06-06 | AF13667GE | 0.630 ppb |
| 2022-06-06 | AF13668GE | ND |
| 2022-09-06 | AF20645GE | ND |
| 2022-09-06 | AF20646GE | ND |
| 2022-09-06 | AF20649GE | ND |
| 2022-09-06 | AF20650GE | ND |
| 2022-09-06 | AF20651GE | ND |
| 2022-09-06 | AF20652GE | ND |
| 2022-09-07 | AF20642GE | ND |
| 2022-09-07 | AF20643GE | ND |
| 2022-09-07 | AF20647GE | ND |
| 2022-09-07 | AF20648GE | ND |
| 2022-09-08 | AF20644GE | ND |
| 2022-09-08 | AF20653GE | ND |
| 2022-12-05 | AF27777GE | ND |
| 2022-12-05 | AF27781GE | ND |
| 2022-12-06 | AF27782GE | ND |
| 2022-12-06 | AF27776GE | ND |
| 2022-12-06 | AF27780GE | ND |
| 2022-12-07 | AF27773GE | ND |
| 2022-12-07 | AF27778GE | ND |
| 2022-12-07 | AF27779GE | ND |
| 2022-12-08 | AF27783GE | ND |
| 2022-12-08 | AF27784GE | ND |
| 2022-12-09 | AF27774GE | ND |
| 2022-12-09 | AF27775GE | ND |
| 2023-03-06 | AF33278GE | 0.720 ppb |
| 2023-03-06 | AF33279GE | 0.820 ppb |
| 2023-03-06 | AF33280GE | 0.680 ppb |
| 2023-03-06 | AF33281GE | ND |
| 2023-03-06 | AF33282GE | ND |
| 2023-03-06 | AF33283GE | ND |
| 2023-03-07 | AF33357GE | ND |
| 2023-03-07 | AF33358GE | ND |
| 2023-03-07 | AF33360GE | 0.650 ppb |
| 2023-03-07 | AF33361GE | ND |
| 2023-03-07 | AF33362GE | 0.690 ppb |
| 2023-03-07 | AF33363GE | 0.530 ppb |
| 2023-06-05 | AF39761GE | 0.890 ppb |
| 2023-06-05 | AF39762GE | ND |
| 2023-06-05 | AF39763GE | ND |
| 2023-06-05 | AF39764GE | 0.790 ppb |
| 2023-06-06 | AF39874GE | 1.13 ppb |
| 2023-06-06 | AF39875GE | ND |
| 2023-06-06 | AF39876GE | 0.730 ppb |
| 2023-06-06 | AF39877GE | ND |
| 2023-06-07 | AF40081GE | ND |
| 2023-06-07 | AF40082GE | 1.04 ppb |
| 2023-06-07 | AF40083GE | ND |
| 2023-06-07 | AF40084GE | ND |
| 2023-09-11 | AF47036GE | 0.880 ppb |
| 2023-09-11 | AF47037GE | 0.850 ppb |
| 2023-09-11 | AF47038GE | 0.870 ppb |
| 2023-09-11 | AF47039GE | 1.07 ppb |
| 2023-09-12 | AF47143GE | 0.900 ppb |
| 2023-09-12 | AF47144GE | 0.850 ppb |
| 2023-09-12 | AF47145GE | 0.710 ppb |
| 2023-09-12 | AF47146GE | 1.80 ppb |
| 2023-09-12 | AF47147GE | ND |
| 2023-09-13 | AF47230GE | 0.880 ppb |
| 2023-09-13 | AF47231GE | 0.860 ppb |
| 2023-09-13 | AF47232GE | 0.960 ppb |
| 2023-12-04 | AF53197GE | ND |
| 2023-12-04 | AF53198GE | ND |
| 2023-12-04 | AF53199GE | ND |
| 2023-12-04 | AF53200GE | ND |
| 2023-12-05 | AF53315GE | ND |
| 2023-12-05 | AF53316GE | ND |
| 2023-12-05 | AF53317GE | ND |
| 2023-12-05 | AF53318GE | ND |
| 2023-12-06 | AF53376GE | ND |
| 2023-12-06 | AF53377GE | ND |
| 2023-12-06 | AF53378GE | ND |
| 2023-12-06 | AF53379GE | ND |