Dibromochloromethane
St John Water District 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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | 5.80 ppb | 58 | 48 | ND - 16.4 ppb |
2015 | 4.99 ppb | 32 | 32 | 2.20 ppb - 9.00 ppb |
2016 | 4.19 ppb | 32 | 28 | ND - 8.80 ppb |
2017 | 4.00 ppb | 32 | 20 | ND - 9.40 ppb |
2018 | 4.43 ppb | 32 | 28 | ND - 11.4 ppb |
2019 | 2.02 ppb | 32 | 16 | ND - 6.50 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 |
---|---|---|
2014-01-22 | AD88499 | 1.69 ppb |
2014-01-22 | AD88499 | 1.69 ppb |
2014-03-05 | 201168804 | ND |
2014-03-05 | 201168805 | ND |
2014-03-05 | 201168806 | 3.70 ppb |
2014-03-05 | 201168808 | 3.50 ppb |
2014-03-05 | 201168809 | 3.60 ppb |
2014-03-05 | 201168810 | 4.30 ppb |
2014-03-05 | 201168811 | 4.20 ppb |
2014-03-05 | 201198807 | 4.40 ppb |
2014-03-05 | 201168804 | ND |
2014-03-05 | 201168805 | ND |
2014-03-05 | 201168806 | 3.70 ppb |
2014-03-05 | 201168808 | 3.50 ppb |
2014-03-05 | 201168809 | 3.60 ppb |
2014-03-05 | 201168810 | 4.30 ppb |
2014-03-05 | 201168811 | 4.20 ppb |
2014-03-05 | 201198807 | 4.40 ppb |
2014-06-04 | 204743001 | 2.30 ppb |
2014-06-04 | 204743002 | 2.00 ppb |
2014-06-04 | 204743003 | 2.00 ppb |
2014-06-04 | 204743004 | 2.20 ppb |
2014-06-04 | 204746001 | ND |
2014-06-04 | 204746002 | ND |
2014-06-04 | 204746003 | 2.10 ppb |
2014-06-04 | 204746004 | ND |
2014-06-04 | 204743001 | 2.30 ppb |
2014-06-04 | 204743002 | 2.00 ppb |
2014-06-04 | 204743003 | 2.00 ppb |
2014-06-04 | 204743004 | 2.20 ppb |
2014-06-04 | 204746001 | ND |
2014-06-04 | 204746002 | ND |
2014-06-04 | 204746003 | 2.10 ppb |
2014-06-04 | 204746004 | ND |
2014-08-27 | 208601001 | 6.90 ppb |
2014-08-27 | 208601002 | 7.80 ppb |
2014-08-27 | 208601003 | 7.70 ppb |
2014-08-27 | 208601004 | 6.80 ppb |
2014-08-27 | 208601001 | 6.90 ppb |
2014-08-27 | 208601002 | 7.80 ppb |
2014-08-27 | 208601003 | 7.70 ppb |
2014-08-27 | 208601004 | 6.80 ppb |
2014-09-18 | 209573001 | 14.8 ppb |
2014-09-18 | 209573002 | 14.9 ppb |
2014-09-18 | 209573003 | 16.4 ppb |
2014-09-18 | 209573004 | 14.2 ppb |
2014-09-18 | 209573001 | 14.8 ppb |
2014-09-18 | 209573002 | 14.9 ppb |
2014-09-18 | 209573003 | 16.4 ppb |
2014-09-18 | 209573004 | 14.2 ppb |
2014-12-10 | 2013526001 | 10.8 ppb |
2014-12-10 | 2013526002 | 10.9 ppb |
2014-12-10 | 2013526003 | 11.0 ppb |
2014-12-10 | 2013526004 | 9.90 ppb |
2014-12-10 | 2013526001 | 10.8 ppb |
2014-12-10 | 2013526002 | 10.9 ppb |
2014-12-10 | 2013526003 | 11.0 ppb |
2014-12-10 | 2013526004 | 9.90 ppb |
2015-03-05 | 2016736001 | 2.20 ppb |
2015-03-05 | 2016736002 | 3.50 ppb |
2015-03-05 | 2016736003 | 2.80 ppb |
2015-03-05 | 2061736004 | 3.60 ppb |
2015-03-05 | 2016736001 | 2.20 ppb |
2015-03-05 | 2016736002 | 3.50 ppb |
2015-03-05 | 2016736003 | 2.80 ppb |
2015-03-05 | 2061736004 | 3.60 ppb |
2015-06-04 | 2020893001 | 5.60 ppb |
2015-06-04 | 2020893002 | 5.30 ppb |
2015-06-04 | 2020893003 | 5.20 ppb |
2015-06-04 | 2020893004 | 4.00 ppb |
2015-06-04 | 2020893001 | 5.60 ppb |
2015-06-04 | 2020893002 | 5.30 ppb |
2015-06-04 | 2020893003 | 5.20 ppb |
2015-06-04 | 2020893004 | 4.00 ppb |
2015-09-02 | 2025096001 | 9.00 ppb |
2015-09-02 | 2025096002 | 7.60 ppb |
2015-09-02 | 2025096003 | 8.60 ppb |
2015-09-02 | 2025096004 | 8.80 ppb |
2015-09-02 | 2025096001 | 9.00 ppb |
2015-09-02 | 2025096002 | 7.60 ppb |
2015-09-02 | 2025096003 | 8.60 ppb |
2015-09-02 | 2025096004 | 8.80 ppb |
2015-12-09 | 2029828001 | 3.00 ppb |
2015-12-09 | 2029828002 | 3.80 ppb |
2015-12-09 | 2029828003 | 3.40 ppb |
2015-12-09 | 2029828004 | 3.40 ppb |
2015-12-09 | 2029828001 | 3.00 ppb |
2015-12-09 | 2029828002 | 3.80 ppb |
2015-12-09 | 2029828003 | 3.40 ppb |
2015-12-09 | 2029828004 | 3.40 ppb |
2016-03-07 | 2033512001 | 2.60 ppb |
2016-03-07 | 2033512002 | 3.10 ppb |
2016-03-07 | 2033512003 | 2.60 ppb |
2016-03-07 | 2033512004 | 2.70 ppb |
2016-03-07 | 2033512001 | 2.60 ppb |
2016-03-07 | 2033512002 | 3.10 ppb |
2016-03-07 | 2033512003 | 2.60 ppb |
2016-03-07 | 2033512004 | 2.70 ppb |
2016-06-08 | 2037926001 | 3.50 ppb |
2016-06-08 | 2037926002 | 3.80 ppb |
2016-06-08 | 2037926003 | 4.10 ppb |
2016-06-08 | 2037926004 | 3.80 ppb |
2016-06-08 | 2037926001 | 3.50 ppb |
2016-06-08 | 2037926002 | 3.80 ppb |
2016-06-08 | 2037926003 | 4.10 ppb |
2016-06-08 | 2037926004 | 3.80 ppb |
2016-09-14 | 2042676001 | ND |
2016-09-14 | 2042676002 | 8.80 ppb |
2016-09-14 | 2042676003 | 5.20 ppb |
2016-09-14 | 2042676004 | ND |
2016-09-14 | 2042676001 | ND |
2016-09-14 | 2042676002 | 8.80 ppb |
2016-09-14 | 2042676003 | 5.20 ppb |
2016-09-14 | 2042676004 | ND |
2016-12-07 | 2047037001 | 6.90 ppb |
2016-12-07 | 2047051001 | 6.90 ppb |
2016-12-07 | 2047056001 | 6.30 ppb |
2016-12-07 | 2047058001 | 6.70 ppb |
2016-12-07 | 2047037001 | 6.90 ppb |
2016-12-07 | 2047051001 | 6.90 ppb |
2016-12-07 | 2047056001 | 6.30 ppb |
2016-12-07 | 2047058001 | 6.70 ppb |
2017-03-10 | 35300153001 | 7.10 ppb |
2017-03-10 | 35300153002 | 6.40 ppb |
2017-03-10 | 35300153003 | 6.90 ppb |
2017-03-10 | 35300153004 | ND |
2017-03-10 | 35300153001 | 7.10 ppb |
2017-03-10 | 35300153002 | 6.40 ppb |
2017-03-10 | 35300153003 | 6.90 ppb |
2017-03-10 | 35300153004 | ND |
2017-06-22 | 35320231009 | 1.90 ppb |
2017-06-22 | 35320231010 | ND |
2017-06-22 | 35320231011 | ND |
2017-06-22 | 35320231012 | ND |
2017-06-22 | 35320231009 | 1.90 ppb |
2017-06-22 | 35320231010 | ND |
2017-06-22 | 35320231011 | ND |
2017-06-22 | 35320231012 | ND |
2017-09-21 | 35337395001 | 9.10 ppb |
2017-09-21 | 35337395002 | 7.70 ppb |
2017-09-21 | 35337395003 | 9.40 ppb |
2017-09-21 | 35337395004 | ND |
2017-09-21 | 35337395001 | 9.10 ppb |
2017-09-21 | 35337395002 | 7.70 ppb |
2017-09-21 | 35337395003 | 9.40 ppb |
2017-09-21 | 35337395004 | ND |
2017-12-14 | 35363550001 | ND |
2017-12-14 | 35363550002 | 5.80 ppb |
2017-12-14 | 35363550003 | 4.30 ppb |
2017-12-14 | 35363550004 | 5.40 ppb |
2017-12-14 | 35363550001 | ND |
2017-12-14 | 35363550002 | 5.80 ppb |
2017-12-14 | 35363550003 | 4.30 ppb |
2017-12-14 | 35363550004 | 5.40 ppb |
2018-03-15 | 35380540001 | ND |
2018-03-15 | 35380540002 | 0.930 ppb |
2018-03-15 | 35380540003 | 0.930 ppb |
2018-03-15 | 35380540004 | ND |
2018-03-15 | 35380540001 | ND |
2018-03-15 | 35380540002 | 0.930 ppb |
2018-03-15 | 35380540003 | 0.930 ppb |
2018-03-15 | 35380540004 | ND |
2018-06-14 | 35398652001 | 4.20 ppb |
2018-06-14 | 35398652002 | 3.60 ppb |
2018-06-14 | 35398652003 | 3.90 ppb |
2018-06-14 | 35398652004 | 4.00 ppb |
2018-06-14 | 35398652001 | 4.20 ppb |
2018-06-14 | 35398652002 | 3.60 ppb |
2018-06-14 | 35398652003 | 3.90 ppb |
2018-06-14 | 35398652004 | 4.00 ppb |
2018-09-06 | 35416143001 | 11.4 ppb |
2018-09-06 | 35416143002 | 10.5 ppb |
2018-09-06 | 35416143003 | 10.5 ppb |
2018-09-06 | 35416143004 | 9.20 ppb |
2018-09-06 | 35416143001 | 11.4 ppb |
2018-09-06 | 35416143002 | 10.5 ppb |
2018-09-06 | 35416143003 | 10.5 ppb |
2018-09-06 | 35416143004 | 9.20 ppb |
2018-12-10 | 35436357001 | 2.50 ppb |
2018-12-10 | 35436357002 | 2.70 ppb |
2018-12-10 | 35436357003 | 3.80 ppb |
2018-12-10 | 35436357004 | 2.70 ppb |
2018-12-10 | 35436357001 | 2.50 ppb |
2018-12-10 | 35436357002 | 2.70 ppb |
2018-12-10 | 35436357003 | 3.80 ppb |
2018-12-10 | 35436357004 | 2.70 ppb |
2019-03-13 | 35454557001 | ND |
2019-03-13 | 35454557002 | ND |
2019-03-13 | 35454557003 | ND |
2019-03-13 | 35454557004 | ND |
2019-03-13 | 35454557001 | ND |
2019-03-13 | 35454557002 | ND |
2019-03-13 | 35454557003 | ND |
2019-03-13 | 35454557004 | ND |
2019-06-11 | 35475288001 | 1.40 ppb |
2019-06-11 | 35475288002 | ND |
2019-06-11 | 35475288003 | 1.40 ppb |
2019-06-11 | 35475288004 | ND |
2019-06-11 | 35475288001 | 1.40 ppb |
2019-06-11 | 35475288002 | ND |
2019-06-11 | 35475288003 | 1.40 ppb |
2019-06-11 | 35475288004 | ND |
2019-09-12 | 35497589001 | 6.50 ppb |
2019-09-12 | 35497589002 | 6.10 ppb |
2019-09-12 | 35497589003 | 5.50 ppb |
2019-09-12 | 35497589004 | 5.90 ppb |
2019-09-12 | 35497589001 | 6.50 ppb |
2019-09-12 | 35497589002 | 6.10 ppb |
2019-09-12 | 35497589003 | 5.50 ppb |
2019-09-12 | 35497589004 | 5.90 ppb |
2019-12-09 | 35517591001 | 2.70 ppb |
2019-12-09 | 35517591002 | ND |
2019-12-09 | 35517591003 | 2.80 ppb |
2019-12-09 | 35517591004 | ND |
2019-12-09 | 35517591001 | 2.70 ppb |
2019-12-09 | 35517591002 | ND |
2019-12-09 | 35517591003 | 2.80 ppb |
2019-12-09 | 35517591004 | ND |