Bromodichloromethane
North Marin Water District
Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane 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 | 6.53 ppb | 38 | 38 | 2.13 ppb - 16.5 ppb |
2015 | 8.73 ppb | 40 | 40 | 1.72 ppb - 17.4 ppb |
2016 | 7.61 ppb | 39 | 36 | ND - 14.2 ppb |
2017 | 5.73 ppb | 39 | 38 | ND - 11.1 ppb |
2018 | 7.74 ppb | 38 | 38 | 3.08 ppb - 29.0 ppb |
2019 | 7.49 ppb | 39 | 38 | ND - 12.6 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.06 ppb
The EWG Health Guideline of 0.06 ppb for bromodichloromethane was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as 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 | 3.18 ppb |
2014-02-05 | 1610-005-1213 | 16.5 ppb |
2014-02-05 | 1610-006-1142 | 4.82 ppb |
2014-02-05 | 1610-007-1315 | 5.32 ppb |
2014-02-05 | 1610-008-1223 | 2.53 ppb |
2014-02-05 | 1610-009-1135 | 5.47 ppb |
2014-02-05 | 1610-014-1156 | 3.26 ppb |
2014-02-05 | 1610-015-1336 | 3.05 ppb |
2014-02-05 | 1610-017-1349 | 3.29 ppb |
2014-05-07 | 1610-001-1343 | 5.84 ppb |
2014-05-07 | 1610-004-1454 | 2.13 ppb |
2014-05-07 | 1610-005-1507 | 3.36 ppb |
2014-05-07 | 1610-006-1323 | 13.3 ppb |
2014-05-07 | 1610-007-1156 | 11.6 ppb |
2014-05-07 | 1610-008-1517 | 4.07 ppb |
2014-05-07 | 1610-009-1316 | 8.76 ppb |
2014-05-07 | 1610-014-1332 | 9.08 ppb |
2014-05-07 | 1610-015-1248 | 10.4 ppb |
2014-05-07 | 1610-017-1300 | 7.17 ppb |
2014-08-06 | 1610-001-1412 | 4.54 ppb |
2014-08-06 | 1610-004-1246 | 4.13 ppb |
2014-08-06 | 1610-005-1426 | 5.74 ppb |
2014-08-06 | 1610-006-1157 | 9.84 ppb |
2014-08-06 | 1610-007-1342 | 9.38 ppb |
2014-08-06 | 1610-008-1301 | 5.90 ppb |
2014-08-06 | 1610-009-1148 | 6.96 ppb |
2014-08-06 | 1610-014-1207 | 7.64 ppb |
2014-08-06 | 1610-015-1325 | 9.04 ppb |
2014-08-06 | 1610-017-1312 | 6.74 ppb |
2014-11-05 | 1610-001-1345 | 4.49 ppb |
2014-11-05 | 1610-005-1205 | 14.1 ppb |
2014-11-05 | 1610-006-1142 | 6.34 ppb |
2014-11-05 | 1610-007-1317 | 6.29 ppb |
2014-11-05 | 1610-008-1240 | 4.32 ppb |
2014-11-05 | 1610-009-1135 | 4.47 ppb |
2014-11-05 | 1610-014-1152 | 5.41 ppb |
2014-11-05 | 1610-015-1301 | 4.12 ppb |
2014-11-05 | 1610-017-1252 | 5.35 ppb |
2015-02-12 | 1610-001-1322 | 6.23 ppb |
2015-02-12 | 1610-006-1134 | 7.87 ppb |
2015-02-12 | 1610-007-1207 | 7.72 ppb |
2015-02-12 | 1610-008-1255 | 6.12 ppb |
2015-02-12 | 1610-009-1127 | 5.61 ppb |
2015-02-12 | 1610-014-1311 | 8.64 ppb |
2015-02-12 | 1610-015-1227 | 6.15 ppb |
2015-02-12 | 1610-017-1240 | 8.74 ppb |
2015-02-13 | 1610-004-1148 | 4.31 ppb |
2015-02-13 | 1610-005-1200 | 5.87 ppb |
2015-05-06 | 1610-001-1413 | 5.00 ppb |
2015-05-06 | 1610-004-1354 | 5.98 ppb |
2015-05-06 | 1610-005-1146 | 8.36 ppb |
2015-05-06 | 1610-006-1217 | 17.4 ppb |
2015-05-06 | 1610-007-1251 | 16.2 ppb |
2015-05-06 | 1610-008-1338 | 9.50 ppb |
2015-05-06 | 1610-009-1224 | 10.2 ppb |
2015-05-06 | 1610-014-1207 | 17.1 ppb |
2015-05-06 | 1610-015-1309 | 11.6 ppb |
2015-05-06 | 1610-017-1321 | 13.2 ppb |
2015-08-05 | 1610-001-1343 | 5.16 ppb |
2015-08-05 | 1610-004-1139 | 1.72 ppb |
2015-08-05 | 1610-005-1330 | 3.09 ppb |
2015-08-05 | 1610-006-1106 | 12.5 ppb |
2015-08-05 | 1610-007-1258 | 11.8 ppb |
2015-08-05 | 1610-008-1214 | 3.59 ppb |
2015-08-05 | 1610-009-1049 | 7.66 ppb |
2015-08-05 | 1610-014-1118 | 8.70 ppb |
2015-08-05 | 1610-015-1240 | 7.66 ppb |
2015-08-05 | 1610-017-1227 | 7.24 ppb |
2015-11-18 | 1610-001-1411 | 4.45 ppb |
2015-11-18 | 1610-004-1134 | 6.35 ppb |
2015-11-18 | 1610-005-1355 | 8.00 ppb |
2015-11-18 | 1610-006-1318 | 14.1 ppb |
2015-11-18 | 1610-007-1256 | 10.9 ppb |
2015-11-18 | 1610-008-1159 | 8.83 ppb |
2015-11-18 | 1610-009-1324 | 10.7 ppb |
2015-11-18 | 1610-014-1334 | 14.9 ppb |
2015-11-18 | 1610-015-1240 | 8.43 ppb |
2015-11-18 | 1610-017-1212 | 11.7 ppb |
2016-02-10 | 1610-001-1316 | 8.54 ppb |
2016-02-10 | 1610-005-1154 | 14.2 ppb |
2016-02-10 | 1610-006-1254 | 11.3 ppb |
2016-02-10 | 1610-007-1109 | 11.1 ppb |
2016-02-10 | 1610-008-1229 | 8.00 ppb |
2016-02-10 | 1610-009-1247 | 10.1 ppb |
2016-02-10 | 1610-014-1305 | 11.4 ppb |
2016-02-10 | 1610-015-1128 | 8.14 ppb |
2016-02-10 | 1610-017-1139 | 10.7 ppb |
2016-05-11 | 1610-001-1418 | 4.27 ppb |
2016-05-11 | 1610-004-1504 | 4.67 ppb |
2016-05-11 | 1610-005-1516 | 6.37 ppb |
2016-05-11 | 1610-006-1353 | 12.5 ppb |
2016-05-11 | 1610-007-1333 | 11.6 ppb |
2016-05-11 | 1610-008-1248 | 6.98 ppb |
2016-05-11 | 1610-009-1400 | 9.15 ppb |
2016-05-11 | 1610-014-1407 | 10.8 ppb |
2016-05-11 | 1610-015-1312 | 8.69 ppb |
2016-05-11 | 1610-017-1301 | 8.44 ppb |
2016-08-10 | 1610-001-1401 | 6.16 ppb |
2016-08-10 | 1610-004-1301 | ND |
2016-08-10 | 1610-005-1315 | ND |
2016-08-10 | 1610-006-1116 | 6.46 ppb |
2016-08-10 | 1610-007-1136 | 6.87 ppb |
2016-08-10 | 1610-008-1232 | ND |
2016-08-10 | 1610-009-1111 | 5.82 ppb |
2016-08-10 | 1610-014-1352 | 6.29 ppb |
2016-08-10 | 1610-015-1158 | 6.23 ppb |
2016-08-10 | 1610-017-1213 | 6.37 ppb |
2016-11-09 | 1610-001-1154 | 5.63 ppb |
2016-11-09 | 1610-004-1212 | 5.10 ppb |
2016-11-09 | 1610-005-1230 | 5.54 ppb |
2016-11-09 | 1610-006-1132 | 9.20 ppb |
2016-11-09 | 1610-007-1335 | 8.75 ppb |
2016-11-09 | 1610-008-1240 | 6.46 ppb |
2016-11-09 | 1610-009-1115 | 8.65 ppb |
2016-11-09 | 1610-014-1143 | 10.8 ppb |
2016-11-09 | 1610-015-1252 | 7.82 ppb |
2016-11-09 | 1610-017-1359 | 8.05 ppb |
2017-02-08 | 1610-001-1444 | 4.99 ppb |
2017-02-08 | 1610-005-1219 | 11.1 ppb |
2017-02-08 | 1610-006-1139 | 6.66 ppb |
2017-02-08 | 1610-007-1403 | 6.85 ppb |
2017-02-08 | 1610-008-1227 | 5.00 ppb |
2017-02-08 | 1610-009-1132 | 5.02 ppb |
2017-02-08 | 1610-014-1152 | 6.62 ppb |
2017-02-08 | 1610-015-1347 | 4.85 ppb |
2017-02-08 | 1610-017-1246 | 6.18 ppb |
2017-05-10 | 1610-001-1256 | 4.75 ppb |
2017-05-10 | 1610-004-1041 | ND |
2017-05-10 | 1610-005-1311 | 4.59 ppb |
2017-05-10 | 1610-006-0940 | 6.82 ppb |
2017-05-10 | 1610-007-1148 | 7.69 ppb |
2017-05-10 | 1610-008-1107 | 4.99 ppb |
2017-05-10 | 1610-009-0930 | 6.81 ppb |
2017-05-10 | 1610-014-0950 | 7.42 ppb |
2017-05-10 | 1610-015-1134 | 6.62 ppb |
2017-05-10 | 1610-017-1122 | 7.19 ppb |
2017-08-09 | 1610-001-1628 | 3.87 ppb |
2017-08-09 | 1610-004-1701 | 5.21 ppb |
2017-08-09 | 1610-005-1718 | 6.23 ppb |
2017-08-09 | 1610-006-1603 | 8.65 ppb |
2017-08-09 | 1610-007-1425 | 7.30 ppb |
2017-08-09 | 1610-008-1524 | 7.55 ppb |
2017-08-09 | 1610-009-1551 | 6.75 ppb |
2017-08-09 | 1610-014-1616 | 8.75 ppb |
2017-08-09 | 1610-015-1445 | 6.90 ppb |
2017-08-09 | 1610-017-1459 | 6.70 ppb |
2017-11-08 | 1610-001-1028 | 3.80 ppb |
2017-11-08 | 1610-004-1046 | 1.68 ppb |
2017-11-08 | 1610-005-1059 | 2.07 ppb |
2017-11-08 | 1610-006-1009 | 5.94 ppb |
2017-11-08 | 1610-007-1157 | 5.76 ppb |
2017-11-08 | 1610-008-1108 | 2.13 ppb |
2017-11-08 | 1610-009-1001 | 4.99 ppb |
2017-11-08 | 1610-014-1019 | 6.05 ppb |
2017-11-08 | 1610-015-1135 | 4.46 ppb |
2017-11-08 | 1610-017-1121 | 4.44 ppb |
2018-02-14 | 1610-001-1343 | 4.54 ppb |
2018-02-14 | 1610-005-1159 | 10.1 ppb |
2018-02-14 | 1610-006-1122 | 6.23 ppb |
2018-02-14 | 1610-007-1241 | 6.67 ppb |
2018-02-14 | 1610-008-1146 | 4.54 ppb |
2018-02-14 | 1610-009-1115 | 5.34 ppb |
2018-02-14 | 1610-014-1133 | 6.16 ppb |
2018-02-14 | 1610-015-1227 | 4.90 ppb |
2018-02-14 | 1610-017-1213 | 5.59 ppb |
2018-05-09 | 1610-001-1533 | 4.59 ppb |
2018-05-09 | 1610-004-1445 | 3.08 ppb |
2018-05-09 | 1610-005-1511 | 3.77 ppb |
2018-05-09 | 1610-006-1400 | 9.90 ppb |
2018-05-09 | 1610-007-1215 | 9.36 ppb |
2018-05-09 | 1610-008-1314 | 4.76 ppb |
2018-05-09 | 1610-009-1347 | 6.94 ppb |
2018-05-09 | 1610-014-1330 | 7.36 ppb |
2018-05-09 | 1610-015-1235 | 5.24 ppb |
2018-05-09 | 1610-017-1256 | 8.36 ppb |
2018-08-15 | 1610-001-1115 | 5.54 ppb |
2018-08-15 | 1610-005-1143 | 16.9 ppb |
2018-08-15 | 1610-006-1056 | 13.3 ppb |
2018-08-15 | 1610-007-1235 | 11.6 ppb |
2018-08-15 | 1610-008-1151 | 6.67 ppb |
2018-08-15 | 1610-009-1049 | 4.72 ppb |
2018-08-15 | 1610-014-1106 | 11.7 ppb |
2018-08-15 | 1610-015-1220 | 7.26 ppb |
2018-08-15 | 1610-017-1205 | 10.1 ppb |
2018-08-16 | 1610-004-1010 | 7.24 ppb |
2018-11-16 | 1610-001-1139 | 4.62 ppb |
2018-11-16 | 1610-005-1528 | 29.0 ppb |
2018-11-16 | 1610-006-1240 | 6.06 ppb |
2018-11-16 | 1610-007-1421 | 7.91 ppb |
2018-11-16 | 1610-008-1301 | 7.47 ppb |
2018-11-16 | 1610-009-1222 | 6.06 ppb |
2018-11-16 | 1610-014-1203 | 5.70 ppb |
2018-11-16 | 1610-015-1349 | 7.65 ppb |
2018-11-16 | 1610-017-1328 | 7.13 ppb |
2019-02-20 | 1610-001-1459 | 5.87 ppb |
2019-02-20 | 1610-005-1305 | 12.6 ppb |
2019-02-20 | 1610-006-1236 | 9.46 ppb |
2019-02-20 | 1610-007-1424 | 9.14 ppb |
2019-02-20 | 1610-008-1335 | 7.57 ppb |
2019-02-20 | 1610-009-1226 | 8.23 ppb |
2019-02-20 | 1610-014-1249 | 10.0 ppb |
2019-02-20 | 1610-015-1405 | 7.54 ppb |
2019-02-20 | 1610-017-1348 | 9.21 ppb |
2019-05-08 | 1610-001-1600 | 5.14 ppb |
2019-05-08 | 1610-004-1445 | 5.89 ppb |
2019-05-08 | 1610-005-1500 | 7.74 ppb |
2019-05-08 | 1610-006-1255 | 8.27 ppb |
2019-05-08 | 1610-007-1330 | 11.8 ppb |
2019-05-08 | 1610-008-1541 | 8.38 ppb |
2019-05-08 | 1610-009-1310 | 7.77 ppb |
2019-05-08 | 1610-014-1237 | 11.0 ppb |
2019-05-08 | 1610-015-1351 | 10.2 ppb |
2019-05-08 | 1610-017-1410 | 9.94 ppb |
2019-08-14 | 1610-001-1342 | 5.45 ppb |
2019-08-14 | 1610-004-1431 | ND |
2019-08-14 | 1610-005-1255 | 1.21 ppb |
2019-08-14 | 1610-006-1143 | 6.88 ppb |
2019-08-14 | 1610-007-1210 | 6.12 ppb |
2019-08-14 | 1610-008-1304 | 1.33 ppb |
2019-08-14 | 1610-009-1133 | 6.25 ppb |
2019-08-14 | 1610-014-1154 | 6.68 ppb |
2019-08-14 | 1610-015-1226 | 4.16 ppb |
2019-08-14 | 1610-017-1240 | 6.42 ppb |
2019-11-13 | 1610-001-1155 | 4.65 ppb |
2019-11-13 | 1610-004-1212 | 4.71 ppb |
2019-11-13 | 1610-005-1224 | 6.02 ppb |
2019-11-13 | 1610-006-1134 | 12.5 ppb |
2019-11-13 | 1610-007-1315 | 9.87 ppb |
2019-11-13 | 1610-008-1235 | 6.73 ppb |
2019-11-13 | 1610-009-1125 | 9.04 ppb |
2019-11-13 | 1610-014-1146 | 12.0 ppb |
2019-11-13 | 1610-015-1302 | 7.19 ppb |
2019-11-13 | 1610-017-1249 | 9.36 ppb |