Dibromochloromethane
Jefferson County Cons. PWSD C 1
Dibromochloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Dibromochloromethane 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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | 1.50 ppb | 16 | 14 | ND - 4.12 ppb |
| 2015 | 0.807 ppb | 16 | 11 | ND - 2.54 ppb |
| 2016 | 0.649 ppb | 16 | 11 | ND - 1.53 ppb |
| 2017 | 1.40 ppb | 16 | 16 | 0.530 ppb - 2.36 ppb |
| 2018 | 0.925 ppb | 10 | 8 | ND - 1.62 ppb |
| 2019 | 0.809 ppb | 8 | 5 | ND - 2.11 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.1 ppb
The EWG Health Guideline of 0.1 ppb for dibromochloromethane 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 |
|---|---|---|
| 2014-02-26 | AC18263 | 1.34 ppb |
| 2014-02-26 | AC18260 | 1.66 ppb |
| 2014-02-26 | AC18261 | 1.69 ppb |
| 2014-02-26 | AC18262 | 1.72 ppb |
| 2014-06-02 | AC28397 | ND |
| 2014-06-02 | AC28398 | 0.750 ppb |
| 2014-06-02 | AC28399 | 1.01 ppb |
| 2014-06-02 | AC28400 | 0.980 ppb |
| 2014-09-10 | AC33492 | 4.12 ppb |
| 2014-09-10 | AC33493 | 3.09 ppb |
| 2014-09-10 | AC33494 | 3.10 ppb |
| 2014-09-10 | AC33495 | 2.67 ppb |
| 2014-12-09 | AC38316 | ND |
| 2014-12-09 | AC38319 | 0.530 ppb |
| 2014-12-09 | AC38317 | 0.780 ppb |
| 2014-12-09 | AC38318 | 0.520 ppb |
| 2015-02-23 | AC42044 | 0.530 ppb |
| 2015-02-23 | AC42045 | 0.590 ppb |
| 2015-02-23 | AC42043 | 0.920 ppb |
| 2015-02-23 | AC42046 | 0.530 ppb |
| 2015-05-26 | AC46596 | 0.890 ppb |
| 2015-05-26 | AC46595 | ND |
| 2015-05-26 | AC46597 | 0.800 ppb |
| 2015-05-26 | AC46598 | 0.580 ppb |
| 2015-09-02 | AC57579 | 2.19 ppb |
| 2015-09-02 | AC57580 | 1.42 ppb |
| 2015-09-02 | AC57577 | 1.92 ppb |
| 2015-09-02 | AC57578 | 2.54 ppb |
| 2015-12-08 | AC62864 | ND |
| 2015-12-08 | AC62863 | ND |
| 2015-12-08 | AC62862 | ND |
| 2015-12-08 | AC62861 | ND |
| 2016-03-09 | AC66410 | ND |
| 2016-03-09 | AC66409 | 0.580 ppb |
| 2016-03-09 | AC66408 | 0.540 ppb |
| 2016-03-09 | AC66407 | 0.560 ppb |
| 2016-06-07 | AC72101 | ND |
| 2016-06-07 | AC72102 | ND |
| 2016-06-07 | AC72103 | ND |
| 2016-06-07 | AC72104 | ND |
| 2016-08-29 | AC81752 | 1.48 ppb |
| 2016-08-29 | AC81753 | 1.53 ppb |
| 2016-08-29 | AC81754 | 1.21 ppb |
| 2016-08-29 | AC81755 | 0.570 ppb |
| 2016-11-03 | AC87000 | 1.18 ppb |
| 2016-11-03 | AC87002 | 1.000 ppb |
| 2016-11-03 | AC87003 | 0.570 ppb |
| 2016-11-03 | AC87001 | 1.17 ppb |
| 2017-02-27 | AC90852 | 1.41 ppb |
| 2017-02-27 | AC90853 | 1.30 ppb |
| 2017-02-27 | AC90850 | 1.32 ppb |
| 2017-02-27 | AC90851 | 1.45 ppb |
| 2017-05-30 | AC95827 | 0.540 ppb |
| 2017-05-30 | AC95830 | 0.530 ppb |
| 2017-05-30 | AC95829 | 0.610 ppb |
| 2017-05-30 | AC95828 | 0.570 ppb |
| 2017-09-06 | AD03580 | 1.98 ppb |
| 2017-09-06 | AD03583 | 1.65 ppb |
| 2017-09-06 | AD03582 | 2.36 ppb |
| 2017-09-06 | AD03581 | 2.04 ppb |
| 2017-11-27 | AD09543 | 1.64 ppb |
| 2017-11-27 | AD09540 | 1.60 ppb |
| 2017-11-27 | AD09541 | 1.60 ppb |
| 2017-11-27 | AD09542 | 1.75 ppb |
| 2018-02-21 | AD14326 | 0.980 ppb |
| 2018-02-21 | AD14327 | 1.10 ppb |
| 2018-02-21 | AD14328 | 1.06 ppb |
| 2018-02-21 | AD14329 | 1.04 ppb |
| 2018-05-29 | AD20556 | ND |
| 2018-05-29 | AD20555 | ND |
| 2018-08-29 | AD31367 | 1.62 ppb |
| 2018-08-29 | AD31368 | 1.61 ppb |
| 2018-11-27 | AD35765 | 0.870 ppb |
| 2018-11-27 | AD35766 | 0.970 ppb |
| 2019-02-25 | AD39433 | ND |
| 2019-02-25 | AD39434 | ND |
| 2019-05-21 | AD47511 | 0.660 ppb |
| 2019-05-21 | AD47512 | ND |
| 2019-08-28 | AD54104 | 1.81 ppb |
| 2019-08-28 | AD54105 | 2.11 ppb |
| 2019-11-21 | AD58147 | 0.860 ppb |
| 2019-11-21 | AD58148 | 1.03 ppb |