Trichloroacetic acid
North Marin Water District
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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | 2.50 ppb | 38 | 26 | ND - 16.1 ppb |
2015 | 3.49 ppb | 40 | 36 | ND - 10.9 ppb |
2016 | 3.30 ppb | 39 | 36 | ND - 7.50 ppb |
2017 | 3.06 ppb | 39 | 36 | ND - 8.50 ppb |
2018 | 3.60 ppb | 38 | 38 | 1.50 ppb - 26.8 ppb |
2019 | 4.11 ppb | 39 | 34 | ND - 8.80 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 |
---|---|---|
2014-02-05 | 1610-001-1409 | ND |
2014-02-05 | 1610-005-1213 | 16.1 ppb |
2014-02-05 | 1610-006-1142 | 1.30 ppb |
2014-02-05 | 1610-007-1315 | 2.30 ppb |
2014-02-05 | 1610-008-1223 | ND |
2014-02-05 | 1610-009-1135 | ND |
2014-02-05 | 1610-014-1156 | ND |
2014-02-05 | 1610-015-1336 | ND |
2014-02-05 | 1610-017-1349 | 1.40 ppb |
2014-05-07 | 1610-001-1343 | ND |
2014-05-07 | 1610-004-1454 | 1.40 ppb |
2014-05-07 | 1610-005-1507 | 2.10 ppb |
2014-05-07 | 1610-006-1323 | 5.40 ppb |
2014-05-07 | 1610-007-1156 | 5.10 ppb |
2014-05-07 | 1610-008-1517 | ND |
2014-05-07 | 1610-009-1316 | 4.70 ppb |
2014-05-07 | 1610-014-1332 | 4.20 ppb |
2014-05-07 | 1610-015-1248 | 4.60 ppb |
2014-05-07 | 1610-017-1300 | 2.90 ppb |
2014-08-06 | 1610-001-1412 | 1.70 ppb |
2014-08-06 | 1610-004-1246 | 1.70 ppb |
2014-08-06 | 1610-005-1426 | 1.90 ppb |
2014-08-06 | 1610-006-1157 | 3.80 ppb |
2014-08-06 | 1610-007-1342 | 4.40 ppb |
2014-08-06 | 1610-008-1301 | 1.90 ppb |
2014-08-06 | 1610-009-1148 | 4.80 ppb |
2014-08-06 | 1610-014-1207 | 4.00 ppb |
2014-08-06 | 1610-015-1325 | 4.30 ppb |
2014-08-06 | 1610-017-1312 | 2.80 ppb |
2014-11-05 | 1610-001-1345 | ND |
2014-11-05 | 1610-005-1205 | 3.50 ppb |
2014-11-05 | 1610-006-1142 | 2.80 ppb |
2014-11-05 | 1610-007-1317 | 3.00 ppb |
2014-11-05 | 1610-008-1240 | ND |
2014-11-05 | 1610-009-1135 | ND |
2014-11-05 | 1610-014-1152 | ND |
2014-11-05 | 1610-015-1301 | ND |
2014-11-05 | 1610-017-1252 | 2.90 ppb |
2015-02-12 | 1610-001-1322 | 2.40 ppb |
2015-02-12 | 1610-006-1134 | 5.20 ppb |
2015-02-12 | 1610-007-1207 | 5.90 ppb |
2015-02-12 | 1610-008-1255 | 2.10 ppb |
2015-02-12 | 1610-009-1127 | 2.30 ppb |
2015-02-12 | 1610-014-1311 | 7.10 ppb |
2015-02-12 | 1610-015-1227 | 2.40 ppb |
2015-02-12 | 1610-017-1240 | 5.20 ppb |
2015-02-13 | 1610-004-1148 | 8.40 ppb |
2015-02-13 | 1610-005-1200 | 10.9 ppb |
2015-05-06 | 1610-001-1413 | ND |
2015-05-06 | 1610-004-1354 | 3.60 ppb |
2015-05-06 | 1610-005-1146 | 3.70 ppb |
2015-05-06 | 1610-006-1217 | 6.40 ppb |
2015-05-06 | 1610-007-1251 | 6.40 ppb |
2015-05-06 | 1610-008-1338 | 5.30 ppb |
2015-05-06 | 1610-009-1224 | 4.90 ppb |
2015-05-06 | 1610-014-1207 | 7.40 ppb |
2015-05-06 | 1610-015-1309 | 5.00 ppb |
2015-05-06 | 1610-017-1321 | 5.80 ppb |
2015-08-05 | 1610-001-1343 | ND |
2015-08-05 | 1610-004-1139 | ND |
2015-08-05 | 1610-005-1330 | 1.20 ppb |
2015-08-05 | 1610-006-1106 | 1.70 ppb |
2015-08-05 | 1610-007-1258 | 1.80 ppb |
2015-08-05 | 1610-008-1214 | 1.40 ppb |
2015-08-05 | 1610-009-1049 | 1.40 ppb |
2015-08-05 | 1610-014-1118 | 1.30 ppb |
2015-08-05 | 1610-015-1240 | 1.20 ppb |
2015-08-05 | 1610-017-1227 | 1.20 ppb |
2015-11-18 | 1610-001-1411 | ND |
2015-11-18 | 1610-004-1134 | 2.80 ppb |
2015-11-18 | 1610-005-1355 | 3.00 ppb |
2015-11-18 | 1610-006-1318 | 4.60 ppb |
2015-11-18 | 1610-007-1256 | 2.80 ppb |
2015-11-18 | 1610-008-1159 | 2.40 ppb |
2015-11-18 | 1610-009-1324 | 3.30 ppb |
2015-11-18 | 1610-014-1334 | 2.90 ppb |
2015-11-18 | 1610-015-1240 | 2.80 ppb |
2015-11-18 | 1610-017-1212 | 3.20 ppb |
2016-02-10 | 1610-001-1316 | 7.50 ppb |
2016-02-10 | 1610-005-1154 | 5.50 ppb |
2016-02-10 | 1610-006-1254 | 3.10 ppb |
2016-02-10 | 1610-007-1109 | 5.50 ppb |
2016-02-10 | 1610-008-1229 | 3.60 ppb |
2016-02-10 | 1610-009-1247 | 5.00 ppb |
2016-02-10 | 1610-014-1305 | 4.00 ppb |
2016-02-10 | 1610-015-1128 | 3.20 ppb |
2016-02-10 | 1610-017-1139 | 3.20 ppb |
2016-05-11 | 1610-001-1418 | 1.20 ppb |
2016-05-11 | 1610-004-1504 | 3.40 ppb |
2016-05-11 | 1610-005-1516 | 5.20 ppb |
2016-05-11 | 1610-006-1353 | 6.60 ppb |
2016-05-11 | 1610-007-1333 | 5.40 ppb |
2016-05-11 | 1610-008-1248 | 4.50 ppb |
2016-05-11 | 1610-009-1400 | 4.70 ppb |
2016-05-11 | 1610-014-1407 | 4.10 ppb |
2016-05-11 | 1610-015-1312 | 4.00 ppb |
2016-05-11 | 1610-017-1301 | 3.80 ppb |
2016-08-10 | 1610-001-1401 | 1.40 ppb |
2016-08-10 | 1610-004-1301 | ND |
2016-08-10 | 1610-005-1315 | ND |
2016-08-10 | 1610-006-1116 | 1.40 ppb |
2016-08-10 | 1610-007-1136 | 2.20 ppb |
2016-08-10 | 1610-008-1232 | ND |
2016-08-10 | 1610-009-1111 | 1.60 ppb |
2016-08-10 | 1610-014-1352 | 1.40 ppb |
2016-08-10 | 1610-015-1158 | 1.40 ppb |
2016-08-10 | 1610-017-1213 | 1.30 ppb |
2016-11-09 | 1610-001-1154 | 1.70 ppb |
2016-11-09 | 1610-004-1212 | 3.00 ppb |
2016-11-09 | 1610-005-1230 | 3.50 ppb |
2016-11-09 | 1610-006-1132 | 4.50 ppb |
2016-11-09 | 1610-007-1335 | 4.40 ppb |
2016-11-09 | 1610-008-1240 | 2.90 ppb |
2016-11-09 | 1610-009-1115 | 4.30 ppb |
2016-11-09 | 1610-014-1143 | 4.10 ppb |
2016-11-09 | 1610-015-1252 | 2.80 ppb |
2016-11-09 | 1610-017-1359 | 3.30 ppb |
2017-02-08 | 1610-001-1444 | 3.50 ppb |
2017-02-08 | 1610-005-1219 | 8.50 ppb |
2017-02-08 | 1610-006-1139 | 5.20 ppb |
2017-02-08 | 1610-007-1403 | 6.20 ppb |
2017-02-08 | 1610-008-1227 | 3.80 ppb |
2017-02-08 | 1610-009-1132 | 4.50 ppb |
2017-02-08 | 1610-014-1152 | 4.30 ppb |
2017-02-08 | 1610-015-1347 | 3.70 ppb |
2017-02-08 | 1610-017-1246 | 5.20 ppb |
2017-05-10 | 1610-001-1256 | 1.60 ppb |
2017-05-10 | 1610-004-1041 | 1.50 ppb |
2017-05-10 | 1610-005-1311 | 1.90 ppb |
2017-05-10 | 1610-006-0940 | 2.80 ppb |
2017-05-10 | 1610-007-1148 | 5.70 ppb |
2017-05-10 | 1610-008-1107 | 1.60 ppb |
2017-05-10 | 1610-009-0930 | 2.90 ppb |
2017-05-10 | 1610-014-0950 | 3.20 ppb |
2017-05-10 | 1610-015-1134 | 3.90 ppb |
2017-05-10 | 1610-017-1122 | 4.20 ppb |
2017-08-09 | 1610-001-1628 | 1.70 ppb |
2017-08-09 | 1610-004-1701 | 3.40 ppb |
2017-08-09 | 1610-005-1718 | 2.70 ppb |
2017-08-09 | 1610-006-1603 | 3.70 ppb |
2017-08-09 | 1610-007-1425 | 3.10 ppb |
2017-08-09 | 1610-008-1524 | 2.60 ppb |
2017-08-09 | 1610-009-1551 | 3.50 ppb |
2017-08-09 | 1610-014-1616 | 3.60 ppb |
2017-08-09 | 1610-015-1445 | 3.40 ppb |
2017-08-09 | 1610-017-1459 | 3.50 ppb |
2017-11-08 | 1610-001-1028 | ND |
2017-11-08 | 1610-004-1046 | ND |
2017-11-08 | 1610-005-1059 | 1.80 ppb |
2017-11-08 | 1610-006-1009 | 2.10 ppb |
2017-11-08 | 1610-007-1157 | 2.00 ppb |
2017-11-08 | 1610-008-1108 | 2.10 ppb |
2017-11-08 | 1610-009-1001 | 2.00 ppb |
2017-11-08 | 1610-014-1019 | 2.10 ppb |
2017-11-08 | 1610-015-1135 | ND |
2017-11-08 | 1610-017-1121 | 2.00 ppb |
2018-02-14 | 1610-001-1343 | 2.30 ppb |
2018-02-14 | 1610-005-1159 | 4.50 ppb |
2018-02-14 | 1610-006-1122 | 3.10 ppb |
2018-02-14 | 1610-007-1241 | 3.30 ppb |
2018-02-14 | 1610-008-1146 | 2.50 ppb |
2018-02-14 | 1610-009-1115 | 3.10 ppb |
2018-02-14 | 1610-014-1133 | 3.70 ppb |
2018-02-14 | 1610-015-1227 | 2.70 ppb |
2018-02-14 | 1610-017-1213 | 3.10 ppb |
2018-05-09 | 1610-001-1533 | 1.60 ppb |
2018-05-09 | 1610-004-1445 | 2.20 ppb |
2018-05-09 | 1610-005-1511 | 2.20 ppb |
2018-05-09 | 1610-006-1400 | 4.10 ppb |
2018-05-09 | 1610-007-1215 | 4.30 ppb |
2018-05-09 | 1610-008-1314 | 2.50 ppb |
2018-05-09 | 1610-009-1347 | 3.70 ppb |
2018-05-09 | 1610-014-1330 | 3.70 ppb |
2018-05-09 | 1610-015-1235 | 2.10 ppb |
2018-05-09 | 1610-017-1256 | 3.80 ppb |
2018-08-15 | 1610-001-1115 | 2.30 ppb |
2018-08-15 | 1610-005-1143 | 5.40 ppb |
2018-08-15 | 1610-006-1056 | 3.50 ppb |
2018-08-15 | 1610-007-1235 | 2.90 ppb |
2018-08-15 | 1610-008-1151 | 1.80 ppb |
2018-08-15 | 1610-009-1049 | 1.90 ppb |
2018-08-15 | 1610-014-1106 | 3.20 ppb |
2018-08-15 | 1610-015-1220 | 2.40 ppb |
2018-08-15 | 1610-017-1205 | 3.00 ppb |
2018-08-16 | 1610-004-1010 | 1.50 ppb |
2018-11-16 | 1610-001-1139 | 1.70 ppb |
2018-11-16 | 1610-005-1528 | 26.8 ppb |
2018-11-16 | 1610-006-1240 | 2.40 ppb |
2018-11-16 | 1610-007-1421 | 3.50 ppb |
2018-11-16 | 1610-008-1301 | 3.10 ppb |
2018-11-16 | 1610-009-1222 | 2.60 ppb |
2018-11-16 | 1610-014-1203 | 1.90 ppb |
2018-11-16 | 1610-015-1349 | 4.30 ppb |
2018-11-16 | 1610-017-1328 | 4.00 ppb |
2019-02-20 | 1610-001-1459 | 5.00 ppb |
2019-02-20 | 1610-005-1305 | ND |
2019-02-20 | 1610-006-1236 | 6.90 ppb |
2019-02-20 | 1610-007-1424 | 6.20 ppb |
2019-02-20 | 1610-008-1335 | 5.50 ppb |
2019-02-20 | 1610-009-1226 | 6.60 ppb |
2019-02-20 | 1610-014-1249 | 7.30 ppb |
2019-02-20 | 1610-015-1405 | 5.60 ppb |
2019-02-20 | 1610-017-1348 | 7.30 ppb |
2019-05-08 | 1610-001-1600 | 1.60 ppb |
2019-05-08 | 1610-004-1445 | 3.20 ppb |
2019-05-08 | 1610-005-1500 | 4.40 ppb |
2019-05-08 | 1610-006-1255 | 3.90 ppb |
2019-05-08 | 1610-007-1330 | 8.80 ppb |
2019-05-08 | 1610-008-1541 | 5.70 ppb |
2019-05-08 | 1610-009-1310 | 6.60 ppb |
2019-05-08 | 1610-014-1237 | 8.10 ppb |
2019-05-08 | 1610-015-1351 | 8.40 ppb |
2019-05-08 | 1610-017-1410 | 8.80 ppb |
2019-08-14 | 1610-001-1342 | 2.00 ppb |
2019-08-14 | 1610-004-1431 | ND |
2019-08-14 | 1610-005-1255 | ND |
2019-08-14 | 1610-006-1143 | 2.20 ppb |
2019-08-14 | 1610-007-1210 | 2.30 ppb |
2019-08-14 | 1610-008-1304 | ND |
2019-08-14 | 1610-009-1133 | 2.20 ppb |
2019-08-14 | 1610-014-1154 | 2.20 ppb |
2019-08-14 | 1610-015-1226 | ND |
2019-08-14 | 1610-017-1240 | 2.10 ppb |
2019-11-13 | 1610-001-1155 | 2.00 ppb |
2019-11-13 | 1610-004-1212 | 2.60 ppb |
2019-11-13 | 1610-005-1224 | 2.80 ppb |
2019-11-13 | 1610-006-1134 | 5.30 ppb |
2019-11-13 | 1610-007-1315 | 4.30 ppb |
2019-11-13 | 1610-008-1235 | 3.00 ppb |
2019-11-13 | 1610-009-1125 | 4.80 ppb |
2019-11-13 | 1610-014-1146 | 5.00 ppb |
2019-11-13 | 1610-015-1302 | 3.20 ppb |
2019-11-13 | 1610-017-1249 | 4.30 ppb |