Bromoform
City of Riverside
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.
309
Samples
0
Samples exceeding legal limit (MCL)
57
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 | 0.0490 ppb | 51 | 2 | ND - 1.40 ppb |
| 2015 | 0.125 ppb | 52 | 4 | ND - 3.00 ppb |
| 2016 | 0.134 ppb | 50 | 6 | ND - 1.20 ppb |
| 2017 | 0.206 ppb | 50 | 9 | ND - 1.20 ppb |
| 2018 | 0.318 ppb | 53 | 19 | ND - 1.20 ppb |
| 2019 | 0.382 ppb | 53 | 17 | ND - 1.40 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 |
|---|---|---|
| 2014-01-07 | 9590-107-0940 | ND |
| 2014-01-14 | 9590-107-0933 | ND |
| 2014-01-21 | 9590-107-0949 | ND |
| 2014-01-28 | 9590-107-0944 | ND |
| 2014-02-11 | 9590-107-0955 | ND |
| 2014-02-18 | 9590-107-0920 | ND |
| 2014-02-18 | 9590-107-1004 | ND |
| 2014-02-25 | 9590-107-0900 | ND |
| 2014-03-11 | 9590-107-1015 | ND |
| 2014-03-18 | 9590-107-0900 | ND |
| 2014-03-25 | 9590-107-0930 | ND |
| 2014-04-01 | 9590-107-0915 | ND |
| 2014-04-08 | 9590-107-0930 | ND |
| 2014-04-15 | 9590-107-0940 | ND |
| 2014-04-22 | 9590-107-0845 | ND |
| 2014-04-29 | 9590-107-0830 | ND |
| 2014-05-06 | 9590-107-0920 | ND |
| 2014-05-13 | 9590-107-0942 | ND |
| 2014-05-20 | 9590-107-0956 | ND |
| 2014-05-27 | 9590-107-0845 | ND |
| 2014-06-03 | 9590-107-0930 | ND |
| 2014-06-10 | 9590-107-0935 | ND |
| 2014-06-17 | 9590-107-1030 | ND |
| 2014-06-24 | 9590-107-0900 | ND |
| 2014-07-01 | 9590-107-0845 | ND |
| 2014-07-08 | 9590-107-0845 | ND |
| 2014-07-15 | 9590-107-0850 | ND |
| 2014-07-22 | 9590-107-0855 | ND |
| 2014-07-29 | 9590-107-0908 | ND |
| 2014-08-05 | 9590-107-0850 | ND |
| 2014-08-12 | 9590-107-0855 | ND |
| 2014-08-19 | 9590-107-0910 | ND |
| 2014-08-26 | 9590-107-0830 | ND |
| 2014-09-02 | 9590-107-0900 | ND |
| 2014-09-09 | 9590-107-0905 | ND |
| 2014-09-16 | 9590-107-0826 | ND |
| 2014-09-23 | 9590-107-0915 | ND |
| 2014-09-30 | 9590-107-0933 | ND |
| 2014-10-07 | 9590-107-0840 | ND |
| 2014-10-14 | 9590-107-0850 | ND |
| 2014-10-21 | 9590-107-0851 | ND |
| 2014-10-28 | 9590-107-0855 | ND |
| 2014-11-04 | 9590-107-0942 | ND |
| 2014-11-12 | 9590-107-0850 | ND |
| 2014-11-18 | 9590-107-0931 | ND |
| 2014-11-25 | 9590-107-0905 | ND |
| 2014-12-02 | 9590-107-0952 | ND |
| 2014-12-09 | 9590-107-0840 | 1.40 ppb |
| 2014-12-16 | 9590-107-0854 | ND |
| 2014-12-23 | 9590-107-0840 | 1.10 ppb |
| 2014-12-30 | 9590-107-0906 | ND |
| 2015-01-06 | 9590-107-0835 | ND |
| 2015-01-13 | 9590-107-0918 | ND |
| 2015-01-20 | 9590-107-1030 | 1.10 ppb |
| 2015-01-27 | 9590-107-0902 | ND |
| 2015-02-03 | 9590-107-0907 | ND |
| 2015-02-10 | 9590-107-0819 | 1.10 ppb |
| 2015-02-17 | 9590-107-0845 | ND |
| 2015-02-24 | 9590-107-0846 | 1.30 ppb |
| 2015-03-03 | 9590-107-0914 | ND |
| 2015-03-10 | 9590-107-0850 | ND |
| 2015-03-17 | 9590-107-0823 | ND |
| 2015-03-24 | 9590-107-0929 | ND |
| 2015-03-31 | 9590-107-0920 | ND |
| 2015-04-07 | 9590-107-0937 | ND |
| 2015-04-14 | 9590-107-0840 | ND |
| 2015-04-21 | 9590-107-0958 | ND |
| 2015-04-28 | 9590-107-0900 | ND |
| 2015-05-05 | 9590-107-0945 | ND |
| 2015-05-12 | 9590-107-0950 | ND |
| 2015-05-19 | 9590-107-0840 | ND |
| 2015-05-26 | 9590-107-0940 | ND |
| 2015-06-02 | 9590-107-0925 | ND |
| 2015-06-09 | 9590-107-0845 | ND |
| 2015-06-16 | 9590-107-1010 | ND |
| 2015-06-23 | 9590-107-0845 | ND |
| 2015-06-30 | 9590-107-1036 | 3.00 ppb |
| 2015-07-07 | 9590-107-0840 | ND |
| 2015-07-14 | 9590-107-0949 | ND |
| 2015-07-21 | 9590-107-0820 | ND |
| 2015-07-28 | 9590-107-0934 | ND |
| 2015-08-04 | 9590-107-0950 | ND |
| 2015-08-11 | 9590-107-0943 | ND |
| 2015-08-18 | 9590-107-0856 | ND |
| 2015-08-25 | 9590-107-0919 | ND |
| 2015-09-01 | 9590-107-0845 | ND |
| 2015-09-08 | 9590-107-0830 | ND |
| 2015-09-15 | 9590-107-1022 | ND |
| 2015-09-22 | 9590-107-0840 | ND |
| 2015-09-29 | 9590-107-0952 | ND |
| 2015-10-06 | 9590-107-1032 | ND |
| 2015-10-13 | 9590-107-0900 | ND |
| 2015-10-20 | 9590-107-0936 | ND |
| 2015-10-27 | 9590-107-0850 | ND |
| 2015-11-03 | 9590-107-0935 | ND |
| 2015-11-10 | 9590-107-0830 | ND |
| 2015-11-17 | 9590-107-1035 | ND |
| 2015-11-24 | 9590-107-0830 | ND |
| 2015-12-01 | 9590-107-1000 | ND |
| 2015-12-08 | 9590-107-0830 | ND |
| 2015-12-15 | 9590-107-1003 | ND |
| 2015-12-22 | 9590-107-0915 | ND |
| 2015-12-29 | 9590-107-0919 | ND |
| 2016-01-05 | 9590-107-0840 | ND |
| 2016-01-12 | 9590-107-1009 | 1.10 ppb |
| 2016-01-20 | 9590-107-0830 | ND |
| 2016-01-26 | 9590-107-0947 | ND |
| 2016-02-02 | 9590-107-0835 | ND |
| 2016-02-09 | 9590-107-1013 | ND |
| 2016-02-16 | 9590-107-0850 | ND |
| 2016-02-23 | 9590-107-1045 | ND |
| 2016-03-01 | 9590-107-0845 | ND |
| 2016-03-08 | 9590-107-1244 | ND |
| 2016-03-15 | 9590-107-0845 | ND |
| 2016-03-22 | 9590-107-1139 | ND |
| 2016-03-29 | 9590-107-1008 | ND |
| 2016-04-05 | 9590-107-0840 | 1.20 ppb |
| 2016-04-12 | 9590-107-1230 | 1.20 ppb |
| 2016-04-19 | 9590-107-1141 | ND |
| 2016-04-26 | 9590-107-0835 | ND |
| 2016-05-03 | 9590-107-1129 | 1.000 ppb |
| 2016-05-10 | 9590-107-0840 | ND |
| 2016-05-17 | 9590-107-0840 | ND |
| 2016-05-24 | 9590-107-1134 | ND |
| 2016-05-31 | 9590-107-0830 | 1.10 ppb |
| 2016-06-07 | 9590-107-1105 | ND |
| 2016-06-14 | 9590-107-0925 | 1.10 ppb |
| 2016-06-21 | 9590-107-1105 | ND |
| 2016-06-28 | 9590-107-0830 | ND |
| 2016-07-05 | 9590-107-0835 | ND |
| 2016-07-12 | 9590-107-1230 | ND |
| 2016-07-19 | 9590-107-0830 | ND |
| 2016-07-26 | 9590-107-1312 | ND |
| 2016-08-02 | 9590-107-0915 | ND |
| 2016-08-09 | 9590-107-1057 | ND |
| 2016-08-16 | 9590-107-0915 | ND |
| 2016-08-23 | 9590-107-1120 | ND |
| 2016-08-30 | 9590-107-0830 | ND |
| 2016-09-06 | 9590-107-1041 | ND |
| 2016-09-27 | 9590-107-0845 | ND |
| 2016-10-04 | 9590-107-1233 | ND |
| 2016-10-11 | 9590-107-0840 | ND |
| 2016-10-18 | 9590-107-0850 | ND |
| 2016-10-25 | 9590-107-1137 | ND |
| 2016-11-01 | 9590-107-0840 | ND |
| 2016-11-08 | 9590-107-1035 | ND |
| 2016-11-15 | 9590-107-1055 | ND |
| 2016-11-22 | 9590-107-0835 | ND |
| 2016-11-29 | 9590-107-1120 | ND |
| 2016-12-06 | 9590-107-0840 | ND |
| 2016-12-13 | 9590-107-0855 | ND |
| 2016-12-20 | 9590-107-0830 | ND |
| 2016-12-27 | 9590-107-1025 | ND |
| 2017-01-04 | 9590-107-0900 | 1.20 ppb |
| 2017-01-10 | 9590-107-1235 | 1.20 ppb |
| 2017-01-17 | 9590-107-1140 | 1.10 ppb |
| 2017-01-24 | 9590-107-0845 | ND |
| 2017-01-31 | 9590-107-1235 | 1.20 ppb |
| 2017-02-07 | 9590-107-0900 | 1.10 ppb |
| 2017-02-14 | 9590-107-1315 | ND |
| 2017-02-21 | 9590-107-0845 | ND |
| 2017-02-28 | 9590-107-0820 | ND |
| 2017-03-07 | 9590-107-0850 | ND |
| 2017-03-28 | 9590-107-1139 | ND |
| 2017-04-04 | 9590-107-0835 | 1.000 ppb |
| 2017-04-11 | 9590-107-1235 | 1.20 ppb |
| 2017-04-18 | 9590-107-1305 | ND |
| 2017-04-25 | 9590-107-0915 | ND |
| 2017-05-02 | 9590-107-1039 | ND |
| 2017-05-09 | 9590-107-0910 | ND |
| 2017-05-16 | 9590-107-1146 | ND |
| 2017-05-23 | 9590-107-0845 | ND |
| 2017-05-30 | 9590-107-0835 | ND |
| 2017-06-06 | 9590-107-1135 | ND |
| 2017-06-13 | 9590-107-0840 | ND |
| 2017-06-20 | 9590-107-1135 | ND |
| 2017-06-27 | 9590-107-0845 | ND |
| 2017-07-05 | 9590-107-1126 | ND |
| 2017-07-11 | 9590-107-0908 | ND |
| 2017-07-18 | 9590-107-0845 | ND |
| 2017-07-25 | 9590-107-1055 | ND |
| 2017-08-01 | 9590-107-0845 | ND |
| 2017-08-08 | 9590-107-1230 | ND |
| 2017-08-15 | 9590-107-1137 | ND |
| 2017-08-22 | 9590-107-0856 | ND |
| 2017-08-29 | 9590-107-1005 | ND |
| 2017-09-05 | 9590-107-1235 | ND |
| 2017-09-12 | 9590-107-0845 | ND |
| 2017-09-19 | 9590-107-0905 | ND |
| 2017-09-26 | 9590-107-1230 | ND |
| 2017-10-03 | 9590-107-0845 | ND |
| 2017-10-10 | 9590-107-0915 | ND |
| 2017-10-17 | 9590-107-1155 | ND |
| 2017-10-24 | 9590-107-0830 | ND |
| 2017-10-31 | 9590-107-1140 | ND |
| 2017-11-07 | 9590-107-0830 | ND |
| 2017-11-14 | 9590-107-0959 | ND |
| 2017-11-21 | 9590-107-0830 | ND |
| 2017-11-28 | 9590-107-1135 | ND |
| 2017-12-05 | 9590-107-0900 | 1.20 ppb |
| 2017-12-12 | 9590-107-1255 | 1.10 ppb |
| 2017-12-19 | 9590-107-0945 | ND |
| 2017-12-27 | 2920-107-1230 | ND |
| 2018-01-02 | 9590-107-0900 | ND |
| 2018-01-10 | 9590-107-1136 | ND |
| 2018-01-16 | 9590-107-0850 | ND |
| 2018-01-23 | 9590-107-1110 | ND |
| 2018-01-30 | 9590-107-0900 | ND |
| 2018-02-06 | 9590-107-1200 | ND |
| 2018-02-13 | 9590-107-0855 | ND |
| 2018-02-20 | 9590-107-1048 | ND |
| 2018-02-27 | 9590-107-0825 | ND |
| 2018-03-06 | 9590-107-0835 | 1.000 ppb |
| 2018-03-13 | 9590-107-1310 | 1.20 ppb |
| 2018-03-20 | 2920-107-0840 | ND |
| 2018-03-27 | 9590-107-1302 | ND |
| 2018-04-03 | 9590-107-0910 | ND |
| 2018-04-10 | 9590-107-1258 | ND |
| 2018-04-17 | 9590-107-0945 | ND |
| 2018-04-24 | 9590-107-1345 | ND |
| 2018-05-01 | 9590-107-0840 | ND |
| 2018-05-08 | 9590-107-1230 | ND |
| 2018-05-15 | 9590-107-0850 | ND |
| 2018-05-22 | 9590-107-0945 | ND |
| 2018-05-29 | 9590-107-0915 | ND |
| 2018-06-05 | 9590-107-1130 | ND |
| 2018-06-12 | 9590-107-0830 | ND |
| 2018-06-19 | 9590-107-1230 | ND |
| 2018-06-26 | 2920-107-1230 | ND |
| 2018-06-26 | 9590-107-1230 | ND |
| 2018-07-03 | 4790-107-1015 | ND |
| 2018-07-10 | 4790-107-0920 | 0.510 ppb |
| 2018-07-17 | 4790-107-1013 | 0.720 ppb |
| 2018-07-24 | 4790-107-0845 | 0.900 ppb |
| 2018-07-31 | 4790-107-1235 | 0.870 ppb |
| 2018-08-07 | 4790-107-0840 | 0.740 ppb |
| 2018-08-14 | 4790-107-1135 | 0.770 ppb |
| 2018-08-21 | 4790-107-0840 | 0.870 ppb |
| 2018-08-28 | 4790-107-1235 | 0.850 ppb |
| 2018-09-05 | 4790-107-0850 | 0.880 ppb |
| 2018-09-12 | 4790-107-1235 | 1.000 ppb |
| 2018-09-18 | 4790-107-0850 | 0.980 ppb |
| 2018-09-25 | 4790-107-1235 | 0.990 ppb |
| 2018-10-03 | 4790-107-0920 | 0.960 ppb |
| 2018-10-09 | 4790-107-0850 | 0.900 ppb |
| 2018-10-16 | 4790-107-1235 | ND |
| 2018-10-23 | 4790-107-0845 | 0.930 ppb |
| 2018-10-30 | 4790-107-1159 | 0.790 ppb |
| 2018-11-06 | 4790-107-0905 | ND |
| 2018-11-13 | 4790-107-0850 | ND |
| 2018-11-20 | 4790-107-1232 | ND |
| 2018-11-27 | 4790-107-1235 | ND |
| 2018-12-04 | 4790-107-0935 | ND |
| 2018-12-11 | 4790-107-1245 | ND |
| 2018-12-18 | 4790-107-0845 | ND |
| 2018-12-24 | 4790-107-0755 | 1.000 ppb |
| 2019-01-02 | 4790-107-0900 | ND |
| 2019-01-08 | 4790-107-1120 | ND |
| 2019-01-15 | 4790-107-0840 | ND |
| 2019-01-22 | 4790-107-0945 | ND |
| 2019-01-29 | 4790-107-1138 | 1.30 ppb |
| 2019-02-05 | 4790-107-1135 | 1.20 ppb |
| 2019-02-12 | 4790-107-0925 | 1.40 ppb |
| 2019-02-13 | 4790-107-1338 | 1.40 ppb |
| 2019-02-19 | 4790-107-0845 | 1.000 ppb |
| 2019-02-26 | 4790-107-1145 | 1.40 ppb |
| 2019-03-05 | 4790-107-1235 | 1.40 ppb |
| 2019-03-12 | 4790-107-0845 | 1.40 ppb |
| 2019-03-19 | 4790-107-1151 | 1.20 ppb |
| 2019-03-26 | 4790-107-0810 | 1.30 ppb |
| 2019-04-02 | 4790-107-0900 | ND |
| 2019-04-09 | 4790-107-1231 | ND |
| 2019-04-16 | 4790-107-0850 | 0.780 ppb |
| 2019-04-23 | 4790-107-0912 | ND |
| 2019-04-30 | 4790-107-0845 | 0.890 ppb |
| 2019-05-14 | 4790-107-1000 | ND |
| 2019-05-21 | 4790-107-0915 | ND |
| 2019-05-28 | 4790-107-1235 | 1.20 ppb |
| 2019-06-04 | 4790-107-0915 | 1.10 ppb |
| 2019-06-11 | 4790-107-1245 | ND |
| 2019-06-18 | 4790-107-0850 | 1.000 ppb |
| 2019-06-25 | 4790-107-0835 | ND |
| 2019-07-02 | 4790-107-0910 | ND |
| 2019-07-09 | 4790-107-0905 | ND |
| 2019-07-16 | 4790-107-1125 | ND |
| 2019-07-23 | 4790-107-0845 | ND |
| 2019-07-30 | 4790-107-1245 | ND |
| 2019-08-06 | 4790-107-0855 | ND |
| 2019-08-13 | 4790-107-0920 | ND |
| 2019-08-20 | 4790-107-0940 | ND |
| 2019-08-27 | 4790-107-1116 | ND |
| 2019-09-03 | 4790-107-0850 | ND |
| 2019-09-10 | 4790-107-0913 | ND |
| 2019-09-17 | 4790-107-0850 | ND |
| 2019-09-24 | 4790-107-0938 | ND |
| 2019-10-01 | 4790-107-1139 | ND |
| 2019-10-08 | 4790-107-0919 | ND |
| 2019-10-15 | 4790-107-1021 | ND |
| 2019-10-22 | 4790-107-0910 | ND |
| 2019-10-29 | 4790-107-1115 | ND |
| 2019-11-05 | 4790-107-0855 | ND |
| 2019-11-12 | 4790-107-0915 | ND |
| 2019-11-19 | 4790-107-0920 | ND |
| 2019-11-26 | 4790-107-0855 | ND |
| 2019-12-03 | 4790-107-0917 | ND |
| 2019-12-10 | 4790-107-0845 | ND |
| 2019-12-18 | 4790-107-0915 | ND |
| 2019-12-23 | 4790-107-0845 | 1.20 ppb |
| 2019-12-30 | 4790-107-0840 | 1.10 ppb |