Bromodichloromethane
City of San Juan Capistrano
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.
203
Samples
0
Samples exceeding legal limit (MCL)
184
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 6.28 ppb | 33 | 25 | ND - 13.0 ppb |
| 2015 | 7.41 ppb | 35 | 31 | ND - 14.0 ppb |
| 2016 | 5.97 ppb | 33 | 32 | ND - 8.00 ppb |
| 2017 | 4.88 ppb | 33 | 32 | ND - 7.60 ppb |
| 2018 | 5.79 ppb | 33 | 32 | ND - 8.80 ppb |
| 2019 | 5.08 ppb | 36 | 32 | ND - 8.00 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 |
|---|---|---|
| 2014-02-10 | 9590-801-0727 | 9.10 ppb |
| 2014-02-10 | 9590-802-1231 | ND |
| 2014-02-10 | 9590-803-0748 | 9.30 ppb |
| 2014-02-10 | 9590-804-0858 | 3.30 ppb |
| 2014-02-10 | 9590-805-1309 | ND |
| 2014-02-10 | 9590-806-1150 | ND |
| 2014-02-10 | 9590-807-1120 | ND |
| 2014-02-10 | 9590-808-1107 | ND |
| 2014-05-12 | 9590-801-0808 | 10.00 ppb |
| 2014-05-12 | 9590-802-0833 | 10.00 ppb |
| 2014-05-12 | 9590-803-0819 | 12.0 ppb |
| 2014-05-12 | 9590-804-0939 | 12.0 ppb |
| 2014-05-12 | 9590-805-1032 | 1.40 ppb |
| 2014-05-12 | 9590-806-1159 | ND |
| 2014-05-12 | 9590-807-1101 | ND |
| 2014-05-12 | 9590-808-1114 | 6.40 ppb |
| 2014-08-11 | 9590-801-0738 | 11.0 ppb |
| 2014-08-11 | 9590-802-0833 | 11.0 ppb |
| 2014-08-11 | 9590-803-0815 | 11.0 ppb |
| 2014-08-11 | 9590-804-0848 | 12.0 ppb |
| 2014-08-11 | 9590-805-1121 | 5.30 ppb |
| 2014-08-11 | 9590-806-1029 | 11.0 ppb |
| 2014-08-11 | 9590-807-0959 | 13.0 ppb |
| 2014-08-11 | 9590-808-0947 | 11.0 ppb |
| 2014-11-10 | 9590-801-0645 | 7.30 ppb |
| 2014-11-10 | 9590-802-1512 | 7.20 ppb |
| 2014-11-10 | 9590-803-1450 | 7.00 ppb |
| 2014-11-10 | 9590-804-0815 | 7.70 ppb |
| 2014-11-10 | 9590-805-1340 | 3.40 ppb |
| 2014-11-10 | 9590-806-1410 | 5.30 ppb |
| 2014-11-10 | 9590-807-1000 | 5.30 ppb |
| 2014-11-10 | 9590-808-1430 | 5.30 ppb |
| 2014-12-23 | 9590-010-1508 | ND |
| 2015-02-09 | 9590-801-1407 | 9.70 ppb |
| 2015-02-09 | 9590-802-1000 | 11.0 ppb |
| 2015-02-09 | 9590-803-1430 | 10.00 ppb |
| 2015-02-09 | 9590-804-1020 | 8.30 ppb |
| 2015-02-09 | 9590-805-1146 | 3.50 ppb |
| 2015-02-09 | 9590-806-1120 | 2.00 ppb |
| 2015-02-09 | 9590-807-1100 | 2.80 ppb |
| 2015-02-09 | 9590-808-1045 | ND |
| 2015-02-10 | 9590-010-1111 | ND |
| 2015-05-11 | 9590-801-0901 | 12.0 ppb |
| 2015-05-11 | 9590-802-1500 | 12.0 ppb |
| 2015-05-11 | 9590-803-1440 | 13.0 ppb |
| 2015-05-11 | 9590-804-0937 | 9.80 ppb |
| 2015-05-11 | 9590-805-1352 | 6.60 ppb |
| 2015-05-11 | 9590-806-1227 | 14.0 ppb |
| 2015-05-11 | 9590-807-1140 | 13.0 ppb |
| 2015-05-11 | 9590-808-1123 | 14.0 ppb |
| 2015-05-19 | 9590-010-0808 | ND |
| 2015-08-10 | 9590-801-0827 | 8.90 ppb |
| 2015-08-10 | 9590-802-0839 | 9.20 ppb |
| 2015-08-10 | 9590-803-0850 | 9.30 ppb |
| 2015-08-10 | 9590-804-0918 | 8.90 ppb |
| 2015-08-10 | 9590-805-1208 | 8.90 ppb |
| 2015-08-10 | 9590-806-1057 | 9.00 ppb |
| 2015-08-10 | 9590-807-1025 | 9.40 ppb |
| 2015-08-10 | 9590-808-1015 | 9.00 ppb |
| 2015-08-24 | 9590-010-0911 | ND |
| 2015-11-11 | 9590-801-0818 | 5.60 ppb |
| 2015-11-11 | 9590-802-0750 | 5.50 ppb |
| 2015-11-11 | 9590-803-0720 | 5.80 ppb |
| 2015-11-11 | 9590-804-0844 | 5.70 ppb |
| 2015-11-11 | 9590-805-1113 | 4.20 ppb |
| 2015-11-11 | 9590-806-1045 | 6.00 ppb |
| 2015-11-11 | 9590-807-1028 | 5.90 ppb |
| 2015-11-11 | 9590-808-1008 | 6.20 ppb |
| 2016-02-03 | 9590-801-1150 | 6.80 ppb |
| 2016-02-03 | 9590-802-0806 | 6.80 ppb |
| 2016-02-03 | 9590-803-0752 | 7.10 ppb |
| 2016-02-03 | 9590-804-0858 | 5.80 ppb |
| 2016-02-03 | 9590-805-1131 | 2.70 ppb |
| 2016-02-03 | 9590-806-1051 | 6.10 ppb |
| 2016-02-03 | 9590-807-1017 | 5.50 ppb |
| 2016-02-03 | 9590-808-1006 | 6.80 ppb |
| 2016-02-29 | 9590-010-0809 | ND |
| 2016-05-10 | 9590-801-0747 | 8.00 ppb |
| 2016-05-10 | 9590-802-0759 | 7.80 ppb |
| 2016-05-10 | 9590-803-0809 | 7.90 ppb |
| 2016-05-10 | 9590-804-0830 | 6.60 ppb |
| 2016-05-10 | 9590-805-1100 | 3.60 ppb |
| 2016-05-10 | 9590-806-1010 | 4.00 ppb |
| 2016-05-10 | 9590-807-0932 | 4.70 ppb |
| 2016-05-10 | 9590-808-0920 | 2.10 ppb |
| 2016-08-09 | 9590-801-0703 | 7.10 ppb |
| 2016-08-09 | 9590-802-0719 | 7.20 ppb |
| 2016-08-09 | 9590-803-0730 | 6.60 ppb |
| 2016-08-09 | 9590-804-0755 | 5.80 ppb |
| 2016-08-09 | 9590-805-1002 | 2.90 ppb |
| 2016-08-09 | 9590-806-0912 | 6.50 ppb |
| 2016-08-09 | 9590-807-0843 | 6.40 ppb |
| 2016-08-09 | 9590-808-1019 | 6.40 ppb |
| 2016-11-16 | 9590-801-0753 | 7.30 ppb |
| 2016-11-16 | 9590-802-0815 | 7.40 ppb |
| 2016-11-16 | 9590-803-0836 | 7.30 ppb |
| 2016-11-16 | 9590-804-0903 | 6.70 ppb |
| 2016-11-16 | 9590-805-1058 | 6.50 ppb |
| 2016-11-16 | 9590-806-1020 | 6.70 ppb |
| 2016-11-16 | 9590-807-0951 | 7.00 ppb |
| 2016-11-16 | 9590-808-0926 | 6.90 ppb |
| 2017-02-08 | 9590-010-0815 | ND |
| 2017-02-18 | 9590-801-0925 | 6.30 ppb |
| 2017-02-18 | 9590-802-0740 | 6.30 ppb |
| 2017-02-18 | 9590-803-0802 | 6.20 ppb |
| 2017-02-18 | 9590-804-0822 | 3.90 ppb |
| 2017-02-18 | 9590-805-1030 | 6.70 ppb |
| 2017-02-18 | 9590-806-1009 | 4.50 ppb |
| 2017-02-18 | 9590-807-0945 | 4.40 ppb |
| 2017-02-18 | 9590-808-0903 | 5.90 ppb |
| 2017-05-09 | 9590-801-0831 | 5.20 ppb |
| 2017-05-09 | 9590-802-0850 | 5.00 ppb |
| 2017-05-09 | 9590-803-0906 | 5.10 ppb |
| 2017-05-09 | 9590-804-0933 | 5.90 ppb |
| 2017-05-09 | 9590-805-1234 | 2.60 ppb |
| 2017-05-09 | 9590-806-1132 | 5.30 ppb |
| 2017-05-09 | 9590-807-1047 | 5.20 ppb |
| 2017-05-09 | 9590-808-1032 | 1.000 ppb |
| 2017-08-14 | 9590-801-0747 | 4.40 ppb |
| 2017-08-14 | 9590-802-0812 | 3.80 ppb |
| 2017-08-14 | 9590-803-0836 | 4.20 ppb |
| 2017-08-14 | 9590-804-0931 | 3.50 ppb |
| 2017-08-14 | 9590-805-1104 | 1.70 ppb |
| 2017-08-14 | 9590-806-0845 | 5.60 ppb |
| 2017-08-14 | 9590-807-0810 | 5.70 ppb |
| 2017-08-14 | 9590-808-1054 | 3.40 ppb |
| 2017-11-14 | 9590-801-0743 | 7.30 ppb |
| 2017-11-14 | 9590-802-0809 | 7.20 ppb |
| 2017-11-14 | 9590-803-0830 | 7.20 ppb |
| 2017-11-14 | 9590-804-0913 | 4.90 ppb |
| 2017-11-14 | 9590-805-1250 | 2.80 ppb |
| 2017-11-14 | 9590-806-1127 | 6.20 ppb |
| 2017-11-14 | 9590-807-1056 | 6.20 ppb |
| 2017-11-14 | 9590-808-1030 | 7.60 ppb |
| 2018-02-14 | 9590-801-0737 | 7.20 ppb |
| 2018-02-14 | 9590-802-0815 | 6.80 ppb |
| 2018-02-14 | 9590-803-0837 | 6.90 ppb |
| 2018-02-14 | 9590-804-0900 | 5.40 ppb |
| 2018-02-14 | 9590-805-1047 | 3.50 ppb |
| 2018-02-14 | 9590-806-1018 | 7.40 ppb |
| 2018-02-14 | 9590-807-0949 | 7.10 ppb |
| 2018-02-14 | 9590-808-0929 | 8.80 ppb |
| 2018-05-15 | 9590-801-0825 | 5.60 ppb |
| 2018-05-15 | 9590-802-0847 | 5.50 ppb |
| 2018-05-15 | 9590-803-0910 | 5.50 ppb |
| 2018-05-15 | 9590-804-0950 | 6.50 ppb |
| 2018-05-15 | 9590-805-1319 | 2.30 ppb |
| 2018-05-15 | 9590-806-1153 | 5.30 ppb |
| 2018-05-15 | 9590-807-1124 | 5.40 ppb |
| 2018-05-15 | 9590-808-1058 | 5.40 ppb |
| 2018-06-13 | 9590-010-1322 | ND |
| 2018-08-14 | 9590-801-0803 | 7.30 ppb |
| 2018-08-14 | 9590-802-0830 | 8.20 ppb |
| 2018-08-14 | 9590-803-0848 | 7.60 ppb |
| 2018-08-14 | 9590-804-0930 | 6.80 ppb |
| 2018-08-14 | 9590-805-1254 | 2.40 ppb |
| 2018-08-14 | 9590-806-1127 | 6.20 ppb |
| 2018-08-14 | 9590-807-1058 | 6.10 ppb |
| 2018-08-14 | 9590-808-1038 | 6.10 ppb |
| 2018-11-13 | 9590-801-0912 | 4.50 ppb |
| 2018-11-13 | 9590-802-0939 | 7.00 ppb |
| 2018-11-13 | 9590-803-1002 | 6.90 ppb |
| 2018-11-13 | 9590-804-1021 | 4.60 ppb |
| 2018-11-13 | 9590-805-1200 | 3.10 ppb |
| 2018-11-13 | 9590-806-1130 | 6.60 ppb |
| 2018-11-13 | 9590-807-1107 | 6.30 ppb |
| 2018-11-13 | 9590-808-1043 | 6.70 ppb |
| 2019-02-12 | 5867-801-1415 | ND |
| 2019-02-12 | 5867-805-0755 | 5.00 ppb |
| 2019-02-12 | 5867-806-0930 | 4.00 ppb |
| 2019-02-12 | 5867-808-1015 | 3.00 ppb |
| 2019-02-20 | 5867-801-1115 | 6.00 ppb |
| 2019-02-20 | 5867-802-1100 | 7.00 ppb |
| 2019-02-20 | 5867-803-1040 | 6.00 ppb |
| 2019-02-20 | 5867-804-0854 | 5.00 ppb |
| 2019-02-20 | 5867-807-1055 | 3.00 ppb |
| 2019-03-27 | 4792-010-0715 | ND |
| 2019-05-14 | 5867-805-0735 | 3.00 ppb |
| 2019-05-14 | 5867-806-0815 | 8.00 ppb |
| 2019-05-14 | 5867-807-1515 | 8.00 ppb |
| 2019-05-15 | 5867-801-1020 | 6.00 ppb |
| 2019-05-15 | 5867-802-1010 | 7.00 ppb |
| 2019-05-15 | 5867-803-0940 | 6.00 ppb |
| 2019-05-15 | 5867-804-0855 | 7.00 ppb |
| 2019-05-15 | 5867-808-0830 | 8.00 ppb |
| 2019-07-08 | 4792-010-1215 | ND |
| 2019-08-13 | 5867-801-0920 | 6.00 ppb |
| 2019-08-13 | 5867-802-0840 | 6.00 ppb |
| 2019-08-13 | 5867-803-1005 | 6.00 ppb |
| 2019-08-13 | 5867-804-0825 | 6.00 ppb |
| 2019-08-13 | 5867-805-1325 | 3.00 ppb |
| 2019-08-13 | 5867-806-1235 | 6.00 ppb |
| 2019-08-13 | 5867-807-1200 | 7.00 ppb |
| 2019-08-13 | 5867-808-1130 | 4.00 ppb |
| 2019-10-15 | 4792-010-1230 | ND |
| 2019-11-19 | 5867-801-1110 | 5.00 ppb |
| 2019-11-19 | 5867-802-1045 | 6.00 ppb |
| 2019-11-19 | 5867-803-1025 | 6.00 ppb |
| 2019-11-19 | 5867-804-0945 | 6.00 ppb |
| 2019-11-19 | 5867-805-0805 | 2.00 ppb |
| 2019-11-19 | 5867-806-0845 | 7.00 ppb |
| 2019-11-19 | 5867-807-0905 | 8.00 ppb |
| 2019-11-19 | 5867-808-0925 | 7.00 ppb |