Trichloroacetic acid
San Jose Water Company
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.
330
Samples
0
Samples exceeding legal limit (MCL)
206
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 | 3.00 ppb | 61 | 17 | ND - 37.2 ppb |
| 2015 | 13.4 ppb | 31 | 17 | ND - 40.5 ppb |
| 2016 | 5.34 ppb | 48 | 27 | ND - 38.4 ppb |
| 2017 | 3.43 ppb | 62 | 36 | ND - 13.5 ppb |
| 2018 | 3.24 ppb | 64 | 52 | ND - 10.5 ppb |
| 2019 | 4.87 ppb | 64 | 57 | ND - 19.0 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.1 ppb
The EWG Health Guideline of 0.1 ppb for trichloroacetic 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 |
|---|---|---|
| 2014-02-28 | 1610-900-0957 | ND |
| 2014-02-28 | 1610-901-1241 | ND |
| 2014-02-28 | 1610-902-0900 | ND |
| 2014-02-28 | 1610-903-0926 | ND |
| 2014-02-28 | 1610-904-0910 | ND |
| 2014-02-28 | 1610-905-1212 | ND |
| 2014-02-28 | 1610-906-1021 | ND |
| 2014-02-28 | 1610-907-1225 | ND |
| 2014-02-28 | 1610-908-0941 | ND |
| 2014-02-28 | 1610-909-1009 | ND |
| 2014-02-28 | 1610-910-1032 | ND |
| 2014-02-28 | 1610-911-1054 | ND |
| 2014-02-28 | 1610-912-1414 | ND |
| 2014-02-28 | 1610-913-1351 | ND |
| 2014-02-28 | 1610-914-1320 | ND |
| 2014-02-28 | 1610-915-1110 | ND |
| 2014-05-07 | 1610-900-0925 | 1.90 ppb |
| 2014-05-07 | 1610-901-1007 | 23.7 ppb |
| 2014-05-07 | 1610-902-0753 | 3.40 ppb |
| 2014-05-07 | 1610-903-0913 | 1.40 ppb |
| 2014-05-07 | 1610-904-0807 | 2.60 ppb |
| 2014-05-07 | 1610-905-0933 | 37.2 ppb |
| 2014-05-07 | 1610-906-1035 | ND |
| 2014-05-07 | 1610-907-0943 | 29.4 ppb |
| 2014-05-07 | 1610-908-0900 | 1.90 ppb |
| 2014-05-07 | 1610-909-1025 | 11.8 ppb |
| 2014-05-07 | 1610-910-1055 | 4.20 ppb |
| 2014-05-07 | 1610-911-1116 | ND |
| 2014-05-07 | 1610-912-1323 | ND |
| 2014-05-07 | 1610-913-1430 | 3.40 ppb |
| 2014-05-07 | 1610-914-1420 | 3.20 ppb |
| 2014-05-07 | 1610-915-1235 | ND |
| 2014-08-25 | 1610-901-1138 | 17.5 ppb |
| 2014-08-25 | 1610-902-0933 | ND |
| 2014-08-25 | 1610-904-0947 | ND |
| 2014-08-25 | 1610-905-1108 | 15.6 ppb |
| 2014-08-25 | 1610-907-1123 | 20.5 ppb |
| 2014-08-25 | 1610-908-1025 | ND |
| 2014-08-25 | 1610-909-1155 | ND |
| 2014-08-25 | 1610-910-1217 | ND |
| 2014-08-25 | 1610-911-1333 | ND |
| 2014-08-25 | 1610-912-1417 | ND |
| 2014-08-25 | 1610-913-1449 | ND |
| 2014-08-25 | 1610-914-1438 | ND |
| 2014-08-25 | 1610-915-1350 | ND |
| 2014-11-07 | 1610-900-1015 | 3.00 ppb |
| 2014-11-07 | 1610-901-1055 | ND |
| 2014-11-07 | 1610-902-0909 | ND |
| 2014-11-07 | 1610-903-1004 | ND |
| 2014-11-07 | 1610-904-0920 | ND |
| 2014-11-07 | 1610-905-1024 | 2.50 ppb |
| 2014-11-07 | 1610-906-1222 | ND |
| 2014-11-07 | 1610-907-1040 | ND |
| 2014-11-07 | 1610-908-0948 | ND |
| 2014-11-07 | 1610-909-1103 | ND |
| 2014-11-07 | 1610-910-1243 | ND |
| 2014-11-07 | 1610-911-1303 | ND |
| 2014-11-07 | 1610-912-1353 | ND |
| 2014-11-07 | 1610-913-1427 | ND |
| 2014-11-07 | 1610-914-1411 | ND |
| 2014-11-07 | 1610-915-1334 | ND |
| 2015-02-06 | 1610-900-1014 | 35.8 ppb |
| 2015-02-06 | 1610-901-0958 | 26.5 ppb |
| 2015-02-06 | 1610-902-1306 | ND |
| 2015-02-06 | 1610-903-1228 | 30.6 ppb |
| 2015-02-06 | 1610-904-1259 | ND |
| 2015-02-06 | 1610-905-0923 | 40.5 ppb |
| 2015-02-06 | 1610-906-0858 | 30.6 ppb |
| 2015-02-06 | 1610-907-0948 | 37.6 ppb |
| 2015-02-06 | 1610-908-1024 | 3.30 ppb |
| 2015-02-06 | 1610-909-0913 | 37.3 ppb |
| 2015-02-06 | 1610-910-1041 | ND |
| 2015-02-06 | 1610-911-1154 | ND |
| 2015-02-06 | 1610-912-1339 | ND |
| 2015-02-06 | 1610-913-1418 | 2.50 ppb |
| 2015-02-06 | 1610-914-1400 | 3.20 ppb |
| 2015-02-06 | 1610-915-1051 | ND |
| 2015-05-29 | 1610-900-1115 | 18.8 ppb |
| 2015-05-29 | 1610-901-1339 | 23.2 ppb |
| 2015-05-29 | 1610-902-1000 | ND |
| 2015-05-29 | 1610-903-1105 | 20.5 ppb |
| 2015-05-29 | 1610-904-1016 | ND |
| 2015-05-29 | 1610-905-1310 | 28.5 ppb |
| 2015-05-29 | 1610-906-1240 | 19.5 ppb |
| 2015-05-29 | 1610-907-1322 | 30.4 ppb |
| 2015-05-29 | 1610-908-1050 | ND |
| 2015-05-29 | 1610-909-1250 | 25.2 ppb |
| 2015-05-29 | 1610-910-1227 | ND |
| 2015-05-29 | 1610-911-1403 | ND |
| 2015-05-29 | 1610-912-1435 | ND |
| 2015-05-29 | 1610-914-1453 | ND |
| 2015-05-29 | 1610-915-1216 | ND |
| 2016-05-06 | 1610-900-0907 | 21.7 ppb |
| 2016-05-06 | 1610-901-1027 | 19.8 ppb |
| 2016-05-06 | 1610-902-0800 | 1.60 ppb |
| 2016-05-06 | 1610-903-0852 | 38.4 ppb |
| 2016-05-06 | 1610-904-0812 | 2.60 ppb |
| 2016-05-06 | 1610-905-0945 | 29.6 ppb |
| 2016-05-06 | 1610-906-1045 | 21.8 ppb |
| 2016-05-06 | 1610-907-1000 | ND |
| 2016-05-06 | 1610-908-0835 | 8.20 ppb |
| 2016-05-06 | 1610-909-0925 | 30.9 ppb |
| 2016-05-06 | 1610-910-1110 | ND |
| 2016-05-06 | 1610-911-1145 | ND |
| 2016-05-06 | 1610-912-1320 | ND |
| 2016-05-06 | 1610-913-1415 | 6.70 ppb |
| 2016-05-06 | 1610-914-1350 | 5.30 ppb |
| 2016-05-06 | 1610-915-1255 | 27.5 ppb |
| 2016-08-19 | 1610-900-1151 | 3.70 ppb |
| 2016-08-19 | 1610-902-1026 | 3.30 ppb |
| 2016-08-19 | 1610-903-1142 | 3.30 ppb |
| 2016-08-19 | 1610-904-1110 | 2.50 ppb |
| 2016-08-19 | 1610-905-1313 | 1.50 ppb |
| 2016-08-19 | 1610-906-1350 | 2.90 ppb |
| 2016-08-19 | 1610-908-1130 | 4.50 ppb |
| 2016-08-19 | 1610-909-1343 | ND |
| 2016-08-19 | 1610-910-1410 | 3.70 ppb |
| 2016-08-19 | 1610-911-0829 | ND |
| 2016-08-19 | 1610-912-0915 | ND |
| 2016-08-19 | 1610-913-0946 | ND |
| 2016-08-19 | 1610-914-0938 | 2.50 ppb |
| 2016-08-19 | 1610-915-0855 | ND |
| 2016-08-26 | 5867-907-0920 | 2.00 ppb |
| 2016-09-08 | 5867-901-1030 | 2.00 ppb |
| 2016-11-01 | 1610-900-1041 | ND |
| 2016-11-01 | 1610-901-1145 | ND |
| 2016-11-01 | 1610-902-0943 | 2.60 ppb |
| 2016-11-01 | 1610-903-1032 | ND |
| 2016-11-01 | 1610-904-0954 | 2.30 ppb |
| 2016-11-01 | 1610-905-1117 | ND |
| 2016-11-01 | 1610-906-1050 | 2.80 ppb |
| 2016-11-01 | 1610-907-1130 | ND |
| 2016-11-01 | 1610-908-1013 | ND |
| 2016-11-01 | 1610-909-1103 | ND |
| 2016-11-01 | 1610-910-1231 | 2.40 ppb |
| 2016-11-01 | 1610-911-1207 | ND |
| 2016-11-01 | 1610-912-1432 | ND |
| 2016-11-01 | 1610-913-1357 | ND |
| 2016-11-01 | 1610-914-1412 | ND |
| 2016-11-01 | 1610-915-1245 | ND |
| 2017-02-10 | 1610-900-0836 | 3.70 ppb |
| 2017-02-10 | 1610-901-0915 | ND |
| 2017-02-10 | 1610-902-0743 | 2.20 ppb |
| 2017-02-10 | 1610-903-0826 | 3.00 ppb |
| 2017-02-10 | 1610-904-0750 | 3.10 ppb |
| 2017-02-10 | 1610-905-0850 | ND |
| 2017-02-10 | 1610-906-0943 | 3.00 ppb |
| 2017-02-10 | 1610-907-0902 | ND |
| 2017-02-10 | 1610-908-0811 | 10.2 ppb |
| 2017-02-10 | 1610-909-0933 | ND |
| 2017-02-10 | 1610-910-1000 | 4.50 ppb |
| 2017-02-10 | 1610-911-1046 | ND |
| 2017-02-10 | 1610-912-1230 | ND |
| 2017-02-10 | 1610-913-1300 | ND |
| 2017-02-10 | 1610-914-1300 | ND |
| 2017-02-10 | 1610-915-1011 | ND |
| 2017-05-15 | 1610-900-1016 | 2.50 ppb |
| 2017-05-15 | 1610-901-1345 | ND |
| 2017-05-15 | 1610-902-0903 | 13.4 ppb |
| 2017-05-15 | 1610-903-1007 | 9.70 ppb |
| 2017-05-15 | 1610-904-0915 | 9.00 ppb |
| 2017-05-15 | 1610-905-1317 | ND |
| 2017-05-15 | 1610-906-1032 | 10.4 ppb |
| 2017-05-15 | 1610-907-1329 | ND |
| 2017-05-15 | 1610-908-0938 | 4.10 ppb |
| 2017-05-15 | 1610-909-1023 | ND |
| 2017-05-15 | 1610-910-1115 | 13.5 ppb |
| 2017-05-15 | 1610-911-1252 | 4.00 ppb |
| 2017-05-15 | 1610-912-1414 | 4.20 ppb |
| 2017-05-15 | 1610-913-1445 | 1.90 ppb |
| 2017-05-15 | 1610-914-1435 | 4.80 ppb |
| 2017-05-15 | 1610-915-1028 | 1.20 ppb |
| 2017-08-14 | 1610-900-1011 | ND |
| 2017-08-14 | 1610-902-0919 | 4.80 ppb |
| 2017-08-14 | 1610-903-1000 | 5.10 ppb |
| 2017-08-14 | 1610-904-0930 | 5.00 ppb |
| 2017-08-14 | 1610-905-1050 | ND |
| 2017-08-14 | 1610-906-1023 | 5.10 ppb |
| 2017-08-14 | 1610-907-1111 | ND |
| 2017-08-14 | 1610-908-0948 | 6.70 ppb |
| 2017-08-14 | 1610-909-1300 | ND |
| 2017-08-14 | 1610-911-1235 | ND |
| 2017-08-14 | 1610-912-1318 | 1.70 ppb |
| 2017-08-14 | 1610-913-1407 | 5.60 ppb |
| 2017-08-14 | 1610-914-1343 | 5.60 ppb |
| 2017-08-14 | 1610-915-1255 | ND |
| 2017-11-01 | 1610-900-1009 | ND |
| 2017-11-01 | 1610-901-1125 | ND |
| 2017-11-01 | 1610-902-0915 | 8.00 ppb |
| 2017-11-01 | 1610-903-1002 | 8.80 ppb |
| 2017-11-01 | 1610-904-0900 | 8.20 ppb |
| 2017-11-01 | 1610-905-1043 | ND |
| 2017-11-01 | 1610-906-1032 | 8.60 ppb |
| 2017-11-01 | 1610-907-1051 | ND |
| 2017-11-01 | 1610-908-0950 | 9.00 ppb |
| 2017-11-01 | 1610-909-1023 | ND |
| 2017-11-01 | 1610-910-1201 | 8.00 ppb |
| 2017-11-01 | 1610-911-1255 | ND |
| 2017-11-01 | 1610-912-1337 | 5.20 ppb |
| 2017-11-01 | 1610-913-1410 | 4.90 ppb |
| 2017-11-01 | 1610-914-1400 | 3.80 ppb |
| 2017-11-01 | 1610-915-1317 | ND |
| 2018-02-12 | 1610-900-1058 | ND |
| 2018-02-12 | 1610-901-1243 | 3.40 ppb |
| 2018-02-12 | 1610-902-0931 | 3.90 ppb |
| 2018-02-12 | 1610-903-1050 | 2.40 ppb |
| 2018-02-12 | 1610-904-0940 | 3.40 ppb |
| 2018-02-12 | 1610-905-1213 | 3.80 ppb |
| 2018-02-12 | 1610-906-1119 | 3.10 ppb |
| 2018-02-12 | 1610-907-1227 | 3.70 ppb |
| 2018-02-12 | 1610-908-1011 | 3.50 ppb |
| 2018-02-12 | 1610-909-1146 | 3.00 ppb |
| 2018-02-12 | 1610-910-1302 | ND |
| 2018-02-12 | 1610-911-1337 | ND |
| 2018-02-12 | 1610-912-1416 | 1.60 ppb |
| 2018-02-12 | 1610-913-1449 | 1.60 ppb |
| 2018-02-12 | 1610-914-1441 | 1.40 ppb |
| 2018-02-12 | 1610-915-1315 | ND |
| 2018-05-07 | 1610-900-1022 | 4.70 ppb |
| 2018-05-07 | 1610-901-1150 | 4.50 ppb |
| 2018-05-07 | 1610-902-0918 | 3.80 ppb |
| 2018-05-07 | 1610-903-1014 | 4.20 ppb |
| 2018-05-07 | 1610-904-0929 | 2.80 ppb |
| 2018-05-07 | 1610-905-1121 | 4.50 ppb |
| 2018-05-07 | 1610-906-1045 | 4.90 ppb |
| 2018-05-07 | 1610-907-1130 | 4.30 ppb |
| 2018-05-07 | 1610-908-0955 | 6.50 ppb |
| 2018-05-07 | 1610-909-1036 | 4.10 ppb |
| 2018-05-07 | 1610-910-1207 | 3.00 ppb |
| 2018-05-07 | 1610-911-1314 | ND |
| 2018-05-07 | 1610-913-1348 | 4.10 ppb |
| 2018-05-07 | 1610-914-1405 | 4.00 ppb |
| 2018-05-07 | 1610-915-1217 | ND |
| 2018-05-08 | 1610-912-1254 | ND |
| 2018-08-02 | 1610-900-1004 | 4.10 ppb |
| 2018-08-02 | 1610-901-1105 | 10.5 ppb |
| 2018-08-02 | 1610-902-0910 | 3.80 ppb |
| 2018-08-02 | 1610-903-0954 | 3.90 ppb |
| 2018-08-02 | 1610-904-0920 | 3.40 ppb |
| 2018-08-02 | 1610-905-1046 | 5.40 ppb |
| 2018-08-02 | 1610-906-1038 | 4.90 ppb |
| 2018-08-02 | 1610-907-1055 | 3.20 ppb |
| 2018-08-02 | 1610-908-0941 | 4.10 ppb |
| 2018-08-02 | 1610-909-1021 | 5.40 ppb |
| 2018-08-02 | 1610-910-1139 | 3.30 ppb |
| 2018-08-02 | 1610-911-1300 | ND |
| 2018-08-02 | 1610-912-1331 | 2.30 ppb |
| 2018-08-02 | 1610-913-1410 | 4.30 ppb |
| 2018-08-02 | 1610-914-1400 | 3.40 ppb |
| 2018-08-02 | 1610-915-1236 | ND |
| 2018-11-05 | 1610-900-1055 | 4.90 ppb |
| 2018-11-05 | 1610-901-1230 | 5.70 ppb |
| 2018-11-05 | 1610-902-0935 | 2.60 ppb |
| 2018-11-05 | 1610-903-1045 | 4.20 ppb |
| 2018-11-05 | 1610-904-0947 | 3.10 ppb |
| 2018-11-05 | 1610-905-1156 | 5.10 ppb |
| 2018-11-05 | 1610-906-1119 | 5.30 ppb |
| 2018-11-05 | 1610-907-1204 | 4.80 ppb |
| 2018-11-05 | 1610-908-1011 | 2.80 ppb |
| 2018-11-05 | 1610-909-1109 | 5.20 ppb |
| 2018-11-05 | 1610-910-1358 | 3.00 ppb |
| 2018-11-05 | 1610-911-1418 | ND |
| 2018-11-05 | 1610-915-1342 | ND |
| 2018-11-06 | 1610-912-1138 | ND |
| 2018-11-06 | 1610-913-1430 | 4.60 ppb |
| 2018-11-06 | 1610-914-1415 | 3.90 ppb |
| 2019-02-11 | 1610-900-1107 | 8.10 ppb |
| 2019-02-11 | 1610-901-1219 | 4.60 ppb |
| 2019-02-11 | 1610-902-0842 | 6.60 ppb |
| 2019-02-11 | 1610-903-1055 | 7.00 ppb |
| 2019-02-11 | 1610-904-0902 | 9.00 ppb |
| 2019-02-11 | 1610-905-1139 | 5.60 ppb |
| 2019-02-11 | 1610-906-1339 | 4.10 ppb |
| 2019-02-11 | 1610-907-1200 | 9.00 ppb |
| 2019-02-11 | 1610-908-1007 | 9.40 ppb |
| 2019-02-11 | 1610-909-1237 | 4.90 ppb |
| 2019-02-11 | 1610-910-1401 | 5.40 ppb |
| 2019-02-11 | 1610-915-1424 | 3.60 ppb |
| 2019-02-12 | 1610-911-0955 | 1.10 ppb |
| 2019-02-12 | 1610-912-1119 | 3.00 ppb |
| 2019-02-12 | 1610-913-1335 | 1.90 ppb |
| 2019-02-12 | 1610-914-1320 | 1.90 ppb |
| 2019-05-08 | 1610-900-1030 | 4.80 ppb |
| 2019-05-08 | 1610-901-1145 | 5.90 ppb |
| 2019-05-08 | 1610-902-0915 | 3.60 ppb |
| 2019-05-08 | 1610-903-1020 | 6.90 ppb |
| 2019-05-08 | 1610-904-0931 | 3.10 ppb |
| 2019-05-08 | 1610-905-1120 | 5.90 ppb |
| 2019-05-08 | 1610-906-1100 | 5.60 ppb |
| 2019-05-08 | 1610-907-1135 | 5.10 ppb |
| 2019-05-08 | 1610-908-0951 | 19.0 ppb |
| 2019-05-08 | 1610-909-1045 | 5.80 ppb |
| 2019-05-08 | 1610-910-1235 | 3.80 ppb |
| 2019-05-08 | 1610-911-1215 | ND |
| 2019-05-08 | 1610-912-1310 | ND |
| 2019-05-08 | 1610-913-1415 | 12.4 ppb |
| 2019-05-08 | 1610-914-1345 | 5.70 ppb |
| 2019-05-08 | 1610-915-1247 | ND |
| 2019-08-14 | 1610-900-0709 | 4.50 ppb |
| 2019-08-14 | 1610-901-0812 | 5.90 ppb |
| 2019-08-14 | 1610-902-0600 | 3.00 ppb |
| 2019-08-14 | 1610-903-0700 | 4.50 ppb |
| 2019-08-14 | 1610-904-1046 | 2.90 ppb |
| 2019-08-14 | 1610-905-0752 | 4.10 ppb |
| 2019-08-14 | 1610-906-0743 | 4.60 ppb |
| 2019-08-14 | 1610-907-0800 | 4.00 ppb |
| 2019-08-14 | 1610-908-0639 | 4.70 ppb |
| 2019-08-14 | 1610-909-0724 | 5.20 ppb |
| 2019-08-14 | 1610-910-0836 | 4.40 ppb |
| 2019-08-14 | 1610-911-0907 | ND |
| 2019-08-14 | 1610-912-1028 | 1.90 ppb |
| 2019-08-14 | 1610-913-1123 | 6.10 ppb |
| 2019-08-14 | 1610-914-1100 | 5.00 ppb |
| 2019-08-14 | 1610-915-0848 | ND |
| 2019-11-20 | 1610-900-1130 | 6.80 ppb |
| 2019-11-20 | 1610-901-1028 | 7.00 ppb |
| 2019-11-20 | 1610-902-1011 | 7.50 ppb |
| 2019-11-20 | 1610-903-1120 | 5.40 ppb |
| 2019-11-20 | 1610-904-0922 | 7.50 ppb |
| 2019-11-20 | 1610-905-0953 | 7.20 ppb |
| 2019-11-20 | 1610-906-1059 | 8.60 ppb |
| 2019-11-20 | 1610-907-1008 | 5.70 ppb |
| 2019-11-20 | 1610-908-0929 | 1.80 ppb |
| 2019-11-20 | 1610-909-1047 | 6.70 ppb |
| 2019-11-20 | 1610-910-1121 | 1.80 ppb |
| 2019-11-20 | 1610-911-1150 | ND |
| 2019-11-20 | 1610-912-1408 | 2.90 ppb |
| 2019-11-20 | 1610-913-1420 | 4.90 ppb |
| 2019-11-20 | 1610-914-1400 | 4.50 ppb |
| 2019-11-20 | 1610-915-1311 | ND |