Bromide
Contra Costa Water District
Bromide is a naturally occurring element found in surface waters and groundwater. During drinking water treatment, bromide can combine with chlorine or other disinfectants, contributing to the formation of toxic tap water disinfection byproducts.
25
Samples
0
Samples exceeding legal limit (MCL)
0
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 | 175.0 ppb | 12 | 11 | ND - 400.0 ppb |
| 2015 | 190.9 ppb | 11 | 11 | 100.0 ppb - 300.0 ppb |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 2 | 0 | ND |
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-03-10 | 2473-003-1119 | 200.0 ppb |
| 2014-04-15 | 2473-003-0810 | 200.0 ppb |
| 2014-05-13 | 2473-003-1255 | 100.0 ppb |
| 2014-06-10 | 2473-003-0755 | 100.0 ppb |
| 2014-07-15 | 2473-003-1255 | 200.0 ppb |
| 2014-07-21 | 2473-019-1330 | ND |
| 2014-07-22 | 2473-003-1345 | 200.0 ppb |
| 2014-08-12 | 2473-003-1454 | 200.0 ppb |
| 2014-09-09 | 2473-003-1255 | 400.0 ppb |
| 2014-10-14 | 2473-003-0830 | 200.0 ppb |
| 2014-11-18 | 2473-003-0830 | 100.0 ppb |
| 2014-12-02 | 2473-003-1345 | 200.0 ppb |
| 2015-03-18 | 2473-003-1427 | 200.0 ppb |
| 2015-04-14 | 2473-003-1335 | 100.0 ppb |
| 2015-05-12 | 2473-003-0821 | 200.0 ppb |
| 2015-06-09 | 2473-003-1341 | 200.0 ppb |
| 2015-07-06 | 2473-003-0815 | 200.0 ppb |
| 2015-07-14 | 2473-003-1400 | 200.0 ppb |
| 2015-08-11 | 2473-003-0955 | 200.0 ppb |
| 2015-09-15 | 2473-003-1200 | 200.0 ppb |
| 2015-10-13 | 2473-003-0900 | 200.0 ppb |
| 2015-11-10 | 2473-003-0945 | 100.0 ppb |
| 2015-12-08 | 2473-003-0900 | 300.0 ppb |
| 2019-07-08 | 1644-804-1050 | ND |
| 2019-07-08 | 1644-003-1206 | ND |