Dibromochloromethane
Zephyr Cove Water Utility Distr
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 |
|---|---|---|---|---|
| 2014 | 0.530 ppb | 6 | 4 | ND - 1.000 ppb |
| 2015 | 0.523 ppb | 10 | 7 | ND - 0.940 ppb |
| 2016 | 1.03 ppb | 8 | 8 | 0.500 ppb - 1.40 ppb |
| 2017 | 0.605 ppb | 8 | 5 | ND - 1.10 ppb |
| 2018 | 0.741 ppb | 8 | 8 | 0.450 ppb - 1.30 ppb |
| 2019 | 0.534 ppb | 8 | 5 | ND - 1.10 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 |
|---|---|---|
| 2014-03-25 | A4C1975-01 | 0.780 ppb |
| 2014-06-24 | A4F2296-01 | 0.630 ppb |
| 2014-09-17 | A4I1928-01 | ND |
| 2014-09-18 | A4I1926-01 | ND |
| 2014-11-25 | A4K2250-01 | 0.770 ppb |
| 2014-11-25 | A4K2250-02 | 1.000 ppb |
| 2015-03-24 | A5C2127-02 | 0.610 ppb |
| 2015-03-24 | A5C2127-01 | 0.710 ppb |
| 2015-06-29 | A5G0051-02 | ND |
| 2015-06-29 | A5G0051-01 | 0.550 ppb |
| 2015-09-16 | A5I1763-02 | ND |
| 2015-09-16 | A5I1763-01 | ND |
| 2015-11-17 | S201511-0656 | 0.940 ppb |
| 2015-11-17 | A5K1707-01 | 0.940 ppb |
| 2015-11-19 | A5J1790-01 | 0.740 ppb |
| 2015-11-19 | A5K1790-01 | 0.740 ppb |
| 2016-02-23 | A6B2153-01 | 0.700 ppb |
| 2016-02-23 | A6B2153-02 | 0.750 ppb |
| 2016-05-24 | A6E2425-02 | 1.20 ppb |
| 2016-05-24 | A6E2425-01 | 1.20 ppb |
| 2016-08-23 | A6H2848-01 | 1.20 ppb |
| 2016-08-23 | A6H2848-02 | 0.500 ppb |
| 2016-11-09 | A6K1392-01 | 1.30 ppb |
| 2016-11-09 | A6K1392-02 | 1.40 ppb |
| 2017-02-21 | A7B2391-02 | ND |
| 2017-02-21 | A7B2391-01 | 1.10 ppb |
| 2017-05-10 | A7E1552-01 | ND |
| 2017-05-10 | A7E1552-02 | 0.830 ppb |
| 2017-08-09 | A7H1542-01 | 1.10 ppb |
| 2017-08-09 | A7H1542-02 | ND |
| 2017-11-21 | A7K2501-01 | 0.990 ppb |
| 2017-11-21 | A7K2501-02 | 0.820 ppb |
| 2018-02-13 | A8B1813-02 | 0.670 ppb |
| 2018-02-13 | A8B1813-01 | 0.640 ppb |
| 2018-05-16 | 18050875-01A | 0.960 ppb |
| 2018-05-16 | A8E2657-02 | 0.560 ppb |
| 2018-08-15 | 1825842-01 | 1.30 ppb |
| 2018-08-15 | 1825842-02 | 0.450 ppb |
| 2018-11-07 | 1835440-01 | 0.670 ppb |
| 2018-11-07 | 1835440-02 | 0.680 ppb |
| 2019-02-12 | 1904655-01 | 0.770 ppb |
| 2019-02-12 | 1904655-02 | 0.860 ppb |
| 2019-05-15 | A9E2398-01 | ND |
| 2019-05-15 | A9E2398-02 | ND |
| 2019-08-21 | A9H3150-01 | ND |
| 2019-08-21 | A9H3150-02 | 1.10 ppb |
| 2019-11-20 | A9K2229-02 | 0.540 ppb |
| 2019-11-20 | A9K2229-01 | 1.000 ppb |