Bromodichloromethane
CTWC - Shoreline Region-Guilford System
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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | 5.39 ppb | 27 | 22 | ND - 15.3 ppb |
| 2019 | 5.18 ppb | 26 | 21 | ND - 10.5 ppb |
| 2020 | 5.20 ppb | 28 | 22 | ND - 11.8 ppb |
| 2021 | 5.65 ppb | 27 | 22 | ND - 17.0 ppb |
| 2022 | 4.76 ppb | 30 | 23 | ND - 11.0 ppb |
| 2023 | 5.58 ppb | 26 | 23 | ND - 14.0 ppb |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.06 ppb
The EWG Health Guideline of 0.06 ppb for bromodichloromethane was based on the California Office of Environmental Health Hazard Assessment's public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer and harm to fetal growth and development.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-01-16 | BZ73485VOC1 | 3.80 ppb |
| 2018-03-15 | CA03073TTHM | 3.70 ppb |
| 2018-03-15 | CA03074TTHM | 2.90 ppb |
| 2018-03-15 | CA03075TTHM | 4.00 ppb |
| 2018-03-15 | CA03076TTHM | 4.10 ppb |
| 2018-03-30 | CA11464VOC1 | 3.40 ppb |
| 2018-04-11 | CA18261VOC1 | 3.90 ppb |
| 2018-06-26 | CA80045TTHM | 11.0 ppb |
| 2018-06-26 | CA80046TTHM | 10.00 ppb |
| 2018-06-26 | CA80047TTHM | 8.70 ppb |
| 2018-06-26 | CA80048TTHM | 6.90 ppb |
| 2018-07-09 | CA85598VOC1 | ND |
| 2018-07-17 | CA91979 | 4.40 ppb |
| 2018-09-12 | DBP 200505042 | 9.50 ppb |
| 2018-09-12 | DBP 200505043 | 15.0 ppb |
| 2018-09-12 | DBP 200505044 | 13.5 ppb |
| 2018-09-12 | DBP 200505047 | 15.3 ppb |
| 2018-09-13 | VOC1 200505275 | ND |
| 2018-09-13 | VOC1 200505276 | ND |
| 2018-09-13 | VOC1 200505266 | ND |
| 2018-09-19 | VOC1 200506116 | 1.60 ppb |
| 2018-09-20 | VOC1 200506324 | ND |
| 2018-10-25 | VOC1 200510568 | 5.20 ppb |
| 2018-12-17 | DBP 200516235 | 4.30 ppb |
| 2018-12-17 | DBP 200516237 | 3.30 ppb |
| 2018-12-17 | DBP 200516238 | 5.20 ppb |
| 2018-12-17 | DBP 200516239 | 5.70 ppb |
| 2019-01-30 | VOC1 200520057 | 2.50 ppb |
| 2019-03-11 | DBP 200524150 | 3.20 ppb |
| 2019-03-11 | DBP 200524151 | 4.30 ppb |
| 2019-03-11 | DBP 200524152 | 5.20 ppb |
| 2019-03-11 | DBP 200524154 | 5.50 ppb |
| 2019-06-14 | DBP 200536672 | 6.00 ppb |
| 2019-06-14 | DBP 200536674 | 7.60 ppb |
| 2019-06-14 | DBP 200536680 | 8.50 ppb |
| 2019-06-14 | DBP 200536682 | 8.00 ppb |
| 2019-06-24 | VOC1 200538005 | 4.20 ppb |
| 2019-07-08 | VOC1 200541172 | 3.80 ppb |
| 2019-07-08 | VOC1 200539194 | ND |
| 2019-07-16 | VOC1 200541091 | ND |
| 2019-07-16 | VOC1 200540648 | 1.50 ppb |
| 2019-07-16 | VOC1 200540644 | ND |
| 2019-09-17 | DBP 200549478 | 8.40 ppb |
| 2019-09-17 | DBP 200549479 | 9.90 ppb |
| 2019-09-17 | DBP 200549480 | 10.5 ppb |
| 2019-09-17 | DBP 200549481 | 10.3 ppb |
| 2019-09-17 | VOC1 200549238 | ND |
| 2019-09-18 | VOC1 200549465 | ND |
| 2019-12-10 | DBP 200559642 | 5.10 ppb |
| 2019-12-10 | DBP 200559643 | 7.00 ppb |
| 2019-12-10 | DBP 200559644 | 7.80 ppb |
| 2019-12-10 | DBP 200559645 | 9.10 ppb |
| 2019-12-10 | VOC1 200559663 | 6.30 ppb |
| 2020-01-14 | VOC1 200562856 | 6.60 ppb |
| 2020-01-20 | VOC1 200563521 | ND |
| 2020-01-21 | VOC1 200563515 | ND |
| 2020-01-30 | VOC1 200564603 | 1.70 ppb |
| 2020-02-11 | VOC1 200565799 | 4.40 ppb |
| 2020-02-25 | VOC1 200567276 | ND |
| 2020-03-03 | DBP 200567998 | 4.40 ppb |
| 2020-03-05 | DBP 200568574 | 3.30 ppb |
| 2020-03-05 | DBP 200568575 | 5.00 ppb |
| 2020-03-05 | DBP 200568576 | 5.20 ppb |
| 2020-04-01 | VOC1 200571017 | 4.50 ppb |
| 2020-06-16 | DBP 200579543 | 8.40 ppb |
| 2020-06-16 | DBP 200579545 | 10.2 ppb |
| 2020-06-16 | DBP 200579546 | 11.8 ppb |
| 2020-06-16 | DBP 200579547 | 10.4 ppb |
| 2020-06-16 | VOC1 200579533 | ND |
| 2020-07-14 | VOC1 200582708 | 4.20 ppb |
| 2020-07-14 | VOC1 200582710 | ND |
| 2020-09-17 | DBP 200591051 | 6.10 ppb |
| 2020-09-17 | DBP 200591052 | 8.20 ppb |
| 2020-09-17 | DBP 200591053 | 9.90 ppb |
| 2020-09-17 | DBP 200591054 | 10.1 ppb |
| 2020-10-06 | VOC1 200592866 | 6.00 ppb |
| 2020-10-13 | VOC1 200593765 | ND |
| 2020-12-22 | DBP 200602030 | 4.00 ppb |
| 2020-12-22 | DBP 200602031 | 8.20 ppb |
| 2020-12-22 | DBP 200602032 | 6.80 ppb |
| 2020-12-22 | DBP 200602033 | 6.10 ppb |
| 2021-01-05 | VOC1 200602753 | ND |
| 2021-01-06 | VOC1 200602996 | 3.40 ppb |
| 2021-01-25 | VOC1 200604768 | 1.60 ppb |
| 2021-03-15 | DBP 200609842 | 3.40 ppb |
| 2021-03-15 | DBP 200609843 | 4.00 ppb |
| 2021-03-15 | DBP 200609844 | 4.40 ppb |
| 2021-03-15 | DBP 200609845 | 4.60 ppb |
| 2021-06-02 | DBP 200619263 | 5.40 ppb |
| 2021-06-02 | DBP 200619264 | 6.50 ppb |
| 2021-06-02 | DBP 200619265 | 7.00 ppb |
| 2021-06-02 | DBP 200619266 | 7.20 ppb |
| 2021-06-07 | VOC1 200621229 | ND |
| 2021-06-23 | VOC1 200622004 | 6.10 ppb |
| 2021-06-29 | VOC1 200622710 | ND |
| 2021-07-12 | VOC1 200624252 | 7.10 ppb |
| 2021-07-12 | VOC1 200624251 | ND |
| 2021-07-20 | VOC1 200625447 | ND |
| 2021-09-14 | 300059734 300059739 | 11.5 ppb |
| 2021-09-14 | 300059735 300059741 | 12.3 ppb |
| 2021-09-14 | 300059736 300059743 | 15.4 ppb |
| 2021-09-14 | 300059737 300059745 | 17.0 ppb |
| 2021-10-11 | V300077965 300077966 | 4.10 ppb |
| 2021-12-06 | V300113153 300113155 | 5.00 ppb |
| 2021-12-09 | D300117672 300117677 | 4.70 ppb |
| 2021-12-09 | D300117673 300117679 | 6.20 ppb |
| 2021-12-09 | D300117674 300117681 | 8.00 ppb |
| 2021-12-09 | D300117675 300117683 | 7.70 ppb |
| 2022-01-11 | CK14095 | 1.40 ppb |
| 2022-01-11 | CK14105 | ND |
| 2022-02-28 | CK76192 | 4.40 ppb |
| 2022-03-07 | CK80900 | ND |
| 2022-03-09 | CK83519 | 3.60 ppb |
| 2022-03-09 | CK83520 | 4.20 ppb |
| 2022-03-09 | CK83521 | 4.90 ppb |
| 2022-03-25 | CK95230 | 4.90 ppb |
| 2022-04-18 | CL11174 | 4.90 ppb |
| 2022-06-14 | CL56476 | ND |
| 2022-06-16 | CL58844 | 6.70 ppb |
| 2022-06-16 | CL58845 | 11.0 ppb |
| 2022-06-16 | CL58846 | 8.70 ppb |
| 2022-06-16 | CL58847 | 11.0 ppb |
| 2022-06-22 | CL62299 | ND |
| 2022-07-06 | CL71457 | 5.80 ppb |
| 2022-07-06 | CL71463 | ND |
| 2022-07-26 | CL89875 | ND |
| 2022-08-02 | CL95977 | 0.860 ppb |
| 2022-08-15 | CM05635 | ND |
| 2022-08-29 | CM17830 | 6.00 ppb |
| 2022-09-13 | CM30714 | 5.00 ppb |
| 2022-09-13 | CM30695 | 9.90 ppb |
| 2022-09-13 | CM30696 | 6.90 ppb |
| 2022-09-13 | CM30697 | 9.90 ppb |
| 2022-12-01 | CM97587 | 4.70 ppb |
| 2022-12-01 | CM97588 | 8.00 ppb |
| 2022-12-01 | CM97589 | 6.10 ppb |
| 2022-12-01 | CM97590 | 7.20 ppb |
| 2022-12-19 | CN08248 | 6.70 ppb |
| 2023-01-03 | CN16052 | 5.00 ppb |
| 2023-01-09 | CN19603 | ND |
| 2023-01-10 | CN20796 | ND |
| 2023-01-10 | CN20798 | 1.50 ppb |
| 2023-02-13 | CN41858 | 2.50 ppb |
| 2023-03-22 | CN66487 | 2.30 ppb |
| 2023-03-22 | CN66488 | 3.80 ppb |
| 2023-03-22 | CN66489 | 2.90 ppb |
| 2023-03-22 | CN66490 | 3.60 ppb |
| 2023-05-10 | CO03368 | 3.60 ppb |
| 2023-06-13 | CO27277 | 1.20 ppb |
| 2023-06-15 | CO31996 | 5.70 ppb |
| 2023-06-15 | CO31997 | 9.90 ppb |
| 2023-06-15 | CO31998 | 8.50 ppb |
| 2023-06-15 | CO31999 | 8.40 ppb |
| 2023-09-05 | CO90683 | 9.90 ppb |
| 2023-09-05 | CO90684 | 13.0 ppb |
| 2023-09-05 | CO90685 | 11.0 ppb |
| 2023-09-05 | CO90686 | 14.0 ppb |
| 2023-09-18 | CP02429 | 5.90 ppb |
| 2023-11-28 | CP55322 | 5.40 ppb |
| 2023-11-29 | CP56431 | ND |
| 2023-12-07 | CP65078 | 4.40 ppb |
| 2023-12-07 | CP65079 | 8.90 ppb |
| 2023-12-07 | CP65080 | 6.00 ppb |
| 2023-12-07 | CP65081 | 7.70 ppb |