Bromoform
Rancho California Water District
Bromoform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromoform 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 | 2.70 ppb | 30 | 16 | ND - 15.0 ppb |
2015 | 2.94 ppb | 47 | 24 | ND - 18.0 ppb |
2016 | ND | 11 | 0 | ND |
2017 | 5.88 ppb | 55 | 34 | ND - 41.0 ppb |
2018 | 3.09 ppb | 62 | 33 | ND - 23.0 ppb |
2019 | 9.02 ppb | 29 | 17 | ND - 31.0 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.5 ppb
The EWG Health Guideline of 0.5 ppb for bromoform 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 |
---|---|---|
2014-02-11 | 4790-801-1023 | 4.30 ppb |
2014-02-11 | 4790-802-0841 | 1.20 ppb |
2014-02-11 | 4790-803-0815 | 8.00 ppb |
2014-02-11 | 4790-804-1056 | 5.70 ppb |
2014-02-11 | 4790-805-0922 | 15.0 ppb |
2014-02-11 | 4790-806-1007 | 7.30 ppb |
2014-02-11 | 4790-807-1039 | 5.70 ppb |
2014-02-11 | 4790-808-0934 | 13.0 ppb |
2014-03-11 | 4790-028-0922 | ND |
2014-03-11 | 4790-046-0815 | ND |
2014-04-02 | 4790-085-1030 | ND |
2014-04-02 | 4790-086-1100 | ND |
2014-04-03 | 4790-043-1015 | ND |
2014-04-03 | 4790-084-0915 | ND |
2014-05-05 | 4790-801-0927 | 0.970 ppb |
2014-05-05 | 4790-802-1115 | 0.770 ppb |
2014-05-05 | 4790-803-1047 | 0.790 ppb |
2014-05-05 | 4790-804-1006 | 1.40 ppb |
2014-05-05 | 4790-805-1205 | 7.50 ppb |
2014-05-05 | 4790-806-0912 | 1.30 ppb |
2014-05-05 | 4790-807-0945 | 4.60 ppb |
2014-05-05 | 4790-808-1150 | 3.60 ppb |
2014-05-08 | 4790-048-0930 | ND |
2014-05-23 | 4790-143-0840 | ND |
2014-06-03 | 4790-051-1140 | ND |
2014-08-06 | 4790-143-0905 | ND |
2014-08-07 | 4790-095-0905 | ND |
2014-09-04 | 4790-059-0935 | ND |
2014-10-02 | 4790-029-0940 | ND |
2014-11-12 | 4790-143-1045 | ND |
2015-01-07 | 4790-097-1215 | ND |
2015-01-29 | 4790-142-1030 | ND |
2015-02-05 | 4790-036-1125 | ND |
2015-02-06 | 4790-042-1100 | ND |
2015-02-11 | 4790-801-0915 | 2.60 ppb |
2015-02-11 | 4790-802-1043 | 1.70 ppb |
2015-02-11 | 4790-803-1028 | 1.50 ppb |
2015-02-11 | 4790-804-0955 | 14.0 ppb |
2015-02-11 | 4790-805-1105 | 11.0 ppb |
2015-02-11 | 4790-806-0903 | 3.80 ppb |
2015-02-11 | 4790-807-0935 | 4.80 ppb |
2015-02-11 | 4790-808-1116 | 6.90 ppb |
2015-04-16 | 4790-058-1045 | ND |
2015-04-22 | 4790-053-1200 | ND |
2015-04-22 | 4790-142-1015 | ND |
2015-05-06 | 4790-143-1050 | ND |
2015-05-12 | 4790-801-1006 | 2.40 ppb |
2015-05-12 | 4790-802-1144 | 2.00 ppb |
2015-05-12 | 4790-803-1122 | 2.80 ppb |
2015-05-12 | 4790-804-1047 | 8.00 ppb |
2015-05-12 | 4790-805-1213 | 16.0 ppb |
2015-05-12 | 4790-806-0954 | 1.80 ppb |
2015-05-12 | 4790-807-1022 | 1.90 ppb |
2015-05-12 | 4790-808-1243 | 7.50 ppb |
2015-05-14 | 4790-015-1025 | ND |
2015-06-02 | 4790-018-1030 | ND |
2015-07-01 | 4790-031-1031 | ND |
2015-07-02 | 4790-040-1130 | ND |
2015-07-14 | 4790-142-1000 | ND |
2015-07-27 | 4790-037-1032 | ND |
2015-08-04 | 4790-801-1424 | 1.70 ppb |
2015-08-04 | 4790-802-0921 | 1.80 ppb |
2015-08-04 | 4790-803-0848 | 1.60 ppb |
2015-08-04 | 4790-804-1545 | 18.0 ppb |
2015-08-04 | 4790-805-1102 | 16.0 ppb |
2015-08-04 | 4790-806-1405 | 2.60 ppb |
2015-08-04 | 4790-807-1444 | 2.00 ppb |
2015-08-04 | 4790-808-1127 | 6.00 ppb |
2015-08-05 | 4790-143-1455 | ND |
2015-08-06 | 4790-017-1245 | ND |
2015-08-06 | 4790-019-1210 | ND |
2015-08-06 | 4790-025-1140 | ND |
2015-08-06 | 4790-038-0945 | ND |
2015-08-07 | 4790-027-0840 | ND |
2015-08-07 | 4790-035-0930 | ND |
2015-10-14 | 4790-142-1045 | ND |
2015-10-22 | 4790-044-0830 | ND |
2016-01-20 | 4790-142-1030 | ND |
2016-02-29 | 4790-150-1830 | ND |
2016-04-14 | 4790-142-1100 | ND |
2016-04-22 | 4790-047-0840 | ND |
2016-04-22 | 4790-071-1030 | ND |
2016-07-25 | 4790-012-1230 | ND |
2016-07-27 | 4790-142-1130 | ND |
2016-08-03 | 4790-034-1145 | ND |
2016-08-03 | 4790-041-0955 | ND |
2016-10-26 | 4790-143-1015 | ND |
2016-11-10 | 4790-153-0935 | ND |
2017-01-18 | 4790-090-1120 | ND |
2017-02-03 | 4790-153-1050 | ND |
2017-02-28 | 4790-801-1129 | 21.0 ppb |
2017-02-28 | 4790-802-0946 | 3.20 ppb |
2017-02-28 | 4790-803-1251 | 4.30 ppb |
2017-02-28 | 4790-804-1212 | 41.0 ppb |
2017-02-28 | 4790-805-1017 | 32.0 ppb |
2017-02-28 | 4790-806-1115 | 36.0 ppb |
2017-02-28 | 4790-807-1146 | 32.0 ppb |
2017-02-28 | 4790-808-1031 | 24.0 ppb |
2017-03-09 | 4790-046-0907 | ND |
2017-03-23 | 4790-142-1020 | ND |
2017-04-11 | 4790-043-0955 | ND |
2017-04-11 | 4790-084-0940 | ND |
2017-04-11 | 4790-085-1040 | ND |
2017-04-12 | 4790-142-1030 | ND |
2017-04-19 | 4790-065-1035 | ND |
2017-04-27 | 4790-086-1025 | 0.520 ppb |
2017-05-04 | 4790-153-1005 | ND |
2017-06-09 | 4790-801-0820 | 3.30 ppb |
2017-06-09 | 4790-802-0958 | 3.20 ppb |
2017-06-09 | 4790-803-0943 | 2.10 ppb |
2017-06-09 | 4790-804-0910 | 4.10 ppb |
2017-06-09 | 4790-805-1020 | 3.80 ppb |
2017-06-09 | 4790-806-0807 | 3.00 ppb |
2017-06-09 | 4790-807-0835 | 3.20 ppb |
2017-06-09 | 4790-808-1030 | 1.90 ppb |
2017-06-14 | 4790-051-1130 | ND |
2017-06-15 | 4790-048-1053 | ND |
2017-07-13 | 4790-142-1035 | ND |
2017-08-09 | 4790-095-1000 | ND |
2017-08-10 | 4790-153-1215 | ND |
2017-08-10 | 4790-801-0853 | 3.00 ppb |
2017-08-10 | 4790-802-1038 | 2.90 ppb |
2017-08-10 | 4790-803-1021 | 2.70 ppb |
2017-08-10 | 4790-804-0950 | 2.80 ppb |
2017-08-10 | 4790-805-1105 | 4.00 ppb |
2017-08-10 | 4790-806-0840 | 2.80 ppb |
2017-08-10 | 4790-807-0919 | 2.80 ppb |
2017-08-10 | 4790-808-1118 | 3.00 ppb |
2017-09-01 | 4790-150-0930 | ND |
2017-09-28 | 4790-059-0943 | ND |
2017-10-17 | 4790-029-1101 | ND |
2017-10-19 | 4790-142-1020 | ND |
2017-11-08 | 4790-150-1445 | ND |
2017-11-22 | 4790-151-1100 | 0.500 ppb |
2017-11-30 | 4790-801-1128 | 3.90 ppb |
2017-11-30 | 4790-802-1033 | 3.60 ppb |
2017-11-30 | 4790-803-1049 | 16.0 ppb |
2017-11-30 | 4790-804-1209 | 6.60 ppb |
2017-11-30 | 4790-805-0948 | 28.0 ppb |
2017-11-30 | 4790-806-1114 | 4.30 ppb |
2017-11-30 | 4790-807-1147 | 4.90 ppb |
2017-11-30 | 4790-808-1004 | 13.0 ppb |
2017-12-06 | 4790-045-1110 | ND |
2018-01-04 | 4790-097-1134 | ND |
2018-01-04 | 4790-142-1242 | ND |
2018-01-18 | 4790-042-0845 | ND |
2018-02-01 | 4790-801-0930 | 2.90 ppb |
2018-02-01 | 4790-802-1152 | 3.20 ppb |
2018-02-01 | 4790-803-1101 | 3.50 ppb |
2018-02-01 | 4790-804-1009 | 11.0 ppb |
2018-02-01 | 4790-805-1230 | 14.0 ppb |
2018-02-01 | 4790-806-0916 | 5.00 ppb |
2018-02-01 | 4790-807-0945 | 3.00 ppb |
2018-02-01 | 4790-808-1304 | 23.0 ppb |
2018-02-05 | 4790-036-1020 | ND |
2018-02-07 | 4790-150-1242 | 0.870 ppb |
2018-02-07 | 4790-151-1148 | ND |
2018-04-18 | 4790-053-1025 | ND |
2018-04-25 | 4790-152-1135 | ND |
2018-05-02 | 4790-801-0954 | 2.50 ppb |
2018-05-02 | 4790-802-1215 | 2.00 ppb |
2018-05-02 | 4790-803-1149 | 1.80 ppb |
2018-05-02 | 4790-804-1105 | 3.10 ppb |
2018-05-02 | 4790-805-1251 | 20.0 ppb |
2018-05-02 | 4790-806-0925 | 2.80 ppb |
2018-05-02 | 4790-807-1014 | 2.80 ppb |
2018-05-02 | 4790-808-1307 | 11.0 ppb |
2018-05-03 | 4790-150-1130 | ND |
2018-05-03 | 4790-151-1235 | ND |
2018-05-08 | 4790-015-1006 | ND |
2018-05-15 | 4790-024-0942 | ND |
2018-06-14 | 4790-018-1020 | ND |
2018-07-02 | 4790-031-1110 | ND |
2018-07-11 | 4790-037-1045 | ND |
2018-07-11 | 4790-040-1231 | ND |
2018-07-17 | 4790-152-1045 | ND |
2018-08-09 | 4790-035-1205 | ND |
2018-08-09 | 4790-151-1000 | ND |
2018-08-14 | 4790-038-1220 | ND |
2018-08-14 | 4790-150-0914 | ND |
2018-08-15 | 4790-017-1214 | ND |
2018-08-15 | 4790-025-0952 | ND |
2018-08-15 | 4790-027-1029 | ND |
2018-08-20 | 4790-801-0927 | 2.00 ppb |
2018-08-20 | 4790-802-1143 | 2.10 ppb |
2018-08-20 | 4790-803-1117 | 1.40 ppb |
2018-08-20 | 4790-804-1010 | 1.90 ppb |
2018-08-20 | 4790-805-1209 | 3.50 ppb |
2018-08-20 | 4790-806-0910 | 1.70 ppb |
2018-08-20 | 4790-807-0946 | 1.70 ppb |
2018-08-20 | 4790-808-1236 | 3.50 ppb |
2018-10-03 | 4790-152-1030 | ND |
2018-10-08 | 4790-143-1000 | ND |
2018-10-09 | 4790-044-1135 | ND |
2018-10-17 | 4790-155-1240 | ND |
2018-11-06 | 4790-150-0957 | ND |
2018-11-06 | 4790-151-1116 | ND |
2018-11-20 | 4790-801-0900 | 2.70 ppb |
2018-11-20 | 4790-802-0945 | 2.20 ppb |
2018-11-20 | 4790-803-0910 | 3.20 ppb |
2018-11-20 | 4790-804-1015 | 15.0 ppb |
2018-11-20 | 4790-805-1100 | 16.0 ppb |
2018-11-20 | 4790-806-0815 | 5.10 ppb |
2018-11-20 | 4790-807-0930 | 7.40 ppb |
2018-11-20 | 4790-808-1035 | 10.00 ppb |
2019-01-09 | 4790-152-1100 | ND |
2019-01-09 | 4790-155-0930 | ND |
2019-02-07 | 4790-801-1055 | 19.0 ppb |
2019-02-07 | 4790-802-0830 | 2.20 ppb |
2019-02-07 | 4790-803-1245 | 6.30 ppb |
2019-02-07 | 4790-804-1200 | 20.0 ppb |
2019-02-07 | 4790-805-0915 | 24.0 ppb |
2019-02-07 | 4790-806-1030 | 19.0 ppb |
2019-02-07 | 4790-807-1130 | 19.0 ppb |
2019-02-07 | 4790-808-0945 | 15.0 ppb |
2019-02-12 | 4790-153-1201 | ND |
2019-02-19 | 4790-150-0958 | 2.00 ppb |
2019-02-19 | 4790-151-0841 | ND |
2019-04-02 | 4790-155-1115 | ND |
2019-04-04 | 4790-071-1009 | ND |
2019-04-09 | 4790-047-0820 | ND |
2019-05-28 | 4790-801-0900 | 31.0 ppb |
2019-05-28 | 4790-802-1305 | 5.40 ppb |
2019-05-28 | 4790-803-1050 | 8.20 ppb |
2019-05-28 | 4790-804-1000 | 21.0 ppb |
2019-05-28 | 4790-805-1140 | 20.0 ppb |
2019-05-28 | 4790-806-0830 | 15.0 ppb |
2019-05-28 | 4790-807-0930 | 26.0 ppb |
2019-05-28 | 4790-808-1210 | 8.40 ppb |
2019-06-04 | 4790-012-1225 | ND |
2019-07-22 | 4790-155-0820 | ND |
2019-08-14 | 4790-034-0931 | ND |
2019-08-14 | 4790-041-1118 | ND |
2019-10-17 | 4790-143-0912 | ND |