Trichloroacetic acid
Lafayette Utilities Water System
Trichloroacetic 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 | 0.951 ppb | 48 | 42 | ND - 2.70 ppb |
| 2019 | 1.03 ppb | 48 | 42 | ND - 2.70 ppb |
| 2020 | 0.634 ppb | 24 | 19 | ND - 1.70 ppb |
| 2021 | 0.603 ppb | 24 | 19 | ND - 1.60 ppb |
| 2022 | 0.779 ppb | 24 | 22 | ND - 1.40 ppb |
| 2023 | 0.901 ppb | 24 | 18 | ND - 2.40 ppb |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.1 ppb
The EWG Health Guideline of 0.1 ppb for trichloroacetic 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. This health guideline protects against cancer and harm to reproduction and child development.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-01-12 | 35368396001 | 0.790 ppb |
| 2018-01-12 | 35368396002 | ND |
| 2018-01-12 | 35368396003 | ND |
| 2018-01-12 | 35368396004 | ND |
| 2018-01-12 | 35368396005 | 1.90 ppb |
| 2018-01-12 | 35368396006 | 1.80 ppb |
| 2018-01-12 | 35368396001 | 0.790 ppb |
| 2018-01-12 | 35368396002 | ND |
| 2018-01-12 | 35368396003 | ND |
| 2018-01-12 | 35368396004 | ND |
| 2018-01-12 | 35368396005 | 1.90 ppb |
| 2018-01-12 | 35368396006 | 1.80 ppb |
| 2018-04-05 | 35384677001 | 1.20 ppb |
| 2018-04-05 | 35384677002 | 0.760 ppb |
| 2018-04-05 | 35384677003 | 0.730 ppb |
| 2018-04-05 | 35384677004 | 1.10 ppb |
| 2018-04-05 | 35384677005 | 2.70 ppb |
| 2018-04-05 | 35384677006 | 0.730 ppb |
| 2018-04-05 | 35384677001 | 1.20 ppb |
| 2018-04-05 | 35384677002 | 0.760 ppb |
| 2018-04-05 | 35384677003 | 0.730 ppb |
| 2018-04-05 | 35384677004 | 1.10 ppb |
| 2018-04-05 | 35384677005 | 2.70 ppb |
| 2018-04-05 | 35384677006 | 0.730 ppb |
| 2018-07-31 | 35407898001 | 1.40 ppb |
| 2018-07-31 | 35407898002 | 0.820 ppb |
| 2018-07-31 | 35407898003 | 0.820 ppb |
| 2018-07-31 | 35407898004 | 1.40 ppb |
| 2018-07-31 | 35407898005 | 0.820 ppb |
| 2018-07-31 | 35407898006 | 0.810 ppb |
| 2018-07-31 | 35407898001 | 1.40 ppb |
| 2018-07-31 | 35407898002 | 0.820 ppb |
| 2018-07-31 | 35407898003 | 0.820 ppb |
| 2018-07-31 | 35407898004 | 1.40 ppb |
| 2018-07-31 | 35407898005 | 0.820 ppb |
| 2018-07-31 | 35407898006 | 0.810 ppb |
| 2018-10-18 | 35425428001 | 1.20 ppb |
| 2018-10-18 | 35425428002 | 0.450 ppb |
| 2018-10-18 | 35425428003 | 0.440 ppb |
| 2018-10-18 | 35425428004 | 0.770 ppb |
| 2018-10-18 | 35425428005 | 1.40 ppb |
| 2018-10-18 | 35425428006 | 0.780 ppb |
| 2018-10-18 | 35425428001 | 1.20 ppb |
| 2018-10-18 | 35425428002 | 0.450 ppb |
| 2018-10-18 | 35425428003 | 0.440 ppb |
| 2018-10-18 | 35425428004 | 0.770 ppb |
| 2018-10-18 | 35425428005 | 1.40 ppb |
| 2018-10-18 | 35425428006 | 0.780 ppb |
| 2019-01-10 | 35441863001 | 1.40 ppb |
| 2019-01-10 | 35441863002 | 0.880 ppb |
| 2019-01-10 | 35441863003 | 0.660 ppb |
| 2019-01-10 | 35441863004 | 1.20 ppb |
| 2019-01-10 | 35441863005 | 1.80 ppb |
| 2019-01-10 | 35441863006 | 1.30 ppb |
| 2019-01-10 | 35441863001 | 1.40 ppb |
| 2019-01-10 | 35441863002 | 0.880 ppb |
| 2019-01-10 | 35441863003 | 0.660 ppb |
| 2019-01-10 | 35441863004 | 1.20 ppb |
| 2019-01-10 | 35441863005 | 1.80 ppb |
| 2019-01-10 | 35441863006 | 1.30 ppb |
| 2019-04-11 | 35461551001 | 1.40 ppb |
| 2019-04-11 | 35461551002 | 0.650 ppb |
| 2019-04-11 | 35461551003 | 0.650 ppb |
| 2019-04-11 | 35461551004 | 0.940 ppb |
| 2019-04-11 | 35461551005 | 2.70 ppb |
| 2019-04-11 | 35461551006 | 0.910 ppb |
| 2019-04-11 | 35461551001 | 1.40 ppb |
| 2019-04-11 | 35461551002 | 0.650 ppb |
| 2019-04-11 | 35461551003 | 0.650 ppb |
| 2019-04-11 | 35461551004 | 0.940 ppb |
| 2019-04-11 | 35461551005 | 2.70 ppb |
| 2019-04-11 | 35461551006 | 0.910 ppb |
| 2019-07-19 | 35483795001 | 1.40 ppb |
| 2019-07-19 | 35483795002 | ND |
| 2019-07-19 | 35483795003 | ND |
| 2019-07-19 | 35483795004 | 0.810 ppb |
| 2019-07-19 | 35483795005 | 2.20 ppb |
| 2019-07-19 | 35483795006 | 0.840 ppb |
| 2019-07-19 | 35483795001 | 1.40 ppb |
| 2019-07-19 | 35483795002 | ND |
| 2019-07-19 | 35483795003 | ND |
| 2019-07-19 | 35483795004 | 0.810 ppb |
| 2019-07-19 | 35483795005 | 2.20 ppb |
| 2019-07-19 | 35483795006 | 0.840 ppb |
| 2019-10-18 | 35506260001 | 1.30 ppb |
| 2019-10-18 | 35506260002 | 0.430 ppb |
| 2019-10-18 | 35506260003 | ND |
| 2019-10-18 | 35506260004 | 0.710 ppb |
| 2019-10-18 | 35506260005 | 2.00 ppb |
| 2019-10-18 | 35506260006 | 0.570 ppb |
| 2019-10-18 | 35506260001 | 1.30 ppb |
| 2019-10-18 | 35506260002 | 0.430 ppb |
| 2019-10-18 | 35506260003 | ND |
| 2019-10-18 | 35506260004 | 0.710 ppb |
| 2019-10-18 | 35506260005 | 2.00 ppb |
| 2019-10-18 | 35506260006 | 0.570 ppb |
| 2020-01-03 | 35521914001 | 1.20 ppb |
| 2020-01-03 | 35521914002 | 0.660 ppb |
| 2020-01-03 | 35521914003 | 0.670 ppb |
| 2020-01-03 | 35521914004 | 0.890 ppb |
| 2020-01-03 | 35521914005 | 1.40 ppb |
| 2020-01-03 | 35521914006 | 0.530 ppb |
| 2020-04-17 | 35544573001 | 0.550 ppb |
| 2020-04-17 | 35544573002 | ND |
| 2020-04-17 | 35544573003 | ND |
| 2020-04-17 | 35544573004 | ND |
| 2020-04-17 | 35544573005 | 0.340 ppb |
| 2020-04-17 | 35544573006 | ND |
| 2020-07-17 | 35564240001 | 1.30 ppb |
| 2020-07-17 | 35564240002 | 0.280 ppb |
| 2020-07-17 | 35564240003 | ND |
| 2020-07-17 | 35564240004 | 0.430 ppb |
| 2020-07-17 | 35564240005 | 0.780 ppb |
| 2020-07-17 | 35564240006 | 0.360 ppb |
| 2020-10-23 | 35587245001 | 1.70 ppb |
| 2020-10-23 | 35587245002 | 0.590 ppb |
| 2020-10-23 | 35587245003 | 0.420 ppb |
| 2020-10-23 | 35587245004 | 0.880 ppb |
| 2020-10-23 | 35587245005 | 1.40 ppb |
| 2020-10-23 | 35587245006 | 0.830 ppb |
| 2021-01-21 | 35606716001 | 1.10 ppb |
| 2021-01-21 | 35606716002 | 0.320 ppb |
| 2021-01-21 | 35606716003 | 0.320 ppb |
| 2021-01-21 | 35606716004 | 0.470 ppb |
| 2021-01-21 | 35606716005 | 0.910 ppb |
| 2021-01-21 | 35606716006 | 0.430 ppb |
| 2021-04-15 | 35626825001 | 0.770 ppb |
| 2021-04-15 | 35626825002 | ND |
| 2021-04-15 | 35626825003 | ND |
| 2021-04-15 | 35626825004 | ND |
| 2021-04-15 | 35626825005 | ND |
| 2021-04-15 | 35626825006 | ND |
| 2021-07-16 | 35648545001 | 1.60 ppb |
| 2021-07-16 | 35648545002 | 0.620 ppb |
| 2021-07-16 | 35648545003 | 0.670 ppb |
| 2021-07-16 | 35648545004 | 1.10 ppb |
| 2021-07-16 | 35648545005 | 0.960 ppb |
| 2021-07-16 | 35648545006 | 1.10 ppb |
| 2021-10-08 | 35670558001 | 1.20 ppb |
| 2021-10-08 | 35670558002 | 0.380 ppb |
| 2021-10-08 | 35670558003 | 0.350 ppb |
| 2021-10-08 | 35670558004 | 0.530 ppb |
| 2021-10-08 | 35670558005 | 1.10 ppb |
| 2021-10-08 | 35670558006 | 0.550 ppb |
| 2022-01-07 | 35689217001 | 1.20 ppb |
| 2022-01-07 | 35689217002 | 0.630 ppb |
| 2022-01-07 | 35689217003 | 0.540 ppb |
| 2022-01-07 | 35689217004 | 0.740 ppb |
| 2022-01-07 | 35689217005 | 1.40 ppb |
| 2022-01-07 | 35689217006 | 0.690 ppb |
| 2022-04-01 | 35707491001 | 0.980 ppb |
| 2022-04-01 | 35707491002 | 0.350 ppb |
| 2022-04-01 | 35707491003 | 0.310 ppb |
| 2022-04-01 | 35707491004 | 0.580 ppb |
| 2022-04-01 | 35707491005 | 0.660 ppb |
| 2022-04-01 | 35707491006 | 0.580 ppb |
| 2022-07-14 | 35731989001 | 0.830 ppb |
| 2022-07-14 | 35731989002 | 1.40 ppb |
| 2022-07-14 | 35731989003 | 0.660 ppb |
| 2022-07-14 | 35731989004 | 0.840 ppb |
| 2022-07-14 | 35731989005 | 1.20 ppb |
| 2022-07-14 | 35731989006 | 1.40 ppb |
| 2022-10-07 | 35751863001 | 1.40 ppb |
| 2022-10-07 | 35751863002 | ND |
| 2022-10-07 | 35751863003 | ND |
| 2022-10-07 | 35751863004 | 0.650 ppb |
| 2022-10-07 | 35751863005 | 0.980 ppb |
| 2022-10-07 | 35751863006 | 0.670 ppb |
| 2023-01-12 | 35772807001 | 1.90 ppb |
| 2023-01-12 | 35772807002 | 0.920 ppb |
| 2023-01-12 | 35772807003 | 1.10 ppb |
| 2023-01-12 | 35772807004 | 1.70 ppb |
| 2023-01-12 | 35772807005 | 1.30 ppb |
| 2023-01-12 | 35772807006 | 1.70 ppb |
| 2023-04-14 | 35792900001 | 1.40 ppb |
| 2023-04-14 | 35792900002 | ND |
| 2023-04-14 | 35792900003 | ND |
| 2023-04-14 | 35792900004 | 0.700 ppb |
| 2023-04-14 | 35792900005 | 1.000 ppb |
| 2023-04-14 | 35792900006 | 0.670 ppb |
| 2023-07-07 | 35811436001 | 1.40 ppb |
| 2023-07-07 | 35811436002 | ND |
| 2023-07-07 | 35811436003 | ND |
| 2023-07-07 | 35811436004 | 0.570 ppb |
| 2023-07-07 | 35811436005 | 1.000 ppb |
| 2023-07-07 | 35811436006 | 0.440 ppb |
| 2023-10-13 | 35834666001 | 1.60 ppb |
| 2023-10-13 | 35834666002 | ND |
| 2023-10-13 | 35834666003 | ND |
| 2023-10-13 | 35834666004 | 0.940 ppb |
| 2023-10-13 | 35834666005 | 2.40 ppb |
| 2023-10-13 | 35834666006 | 0.880 ppb |