Cobalt
San Francisco City Water System
Cobalt is a metal found throughout the environment; people may be exposed to cobalt in air, food and drinking water.
16
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 | ND | 16 | 0 | ND |
| 2014 | N/A | 0 | 0 | N/A |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 70 ppb
The EWG Health Guideline of 70 ppb for cobalt was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against change in blood chemistry.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2013-01-31 | 201302010153AM | ND |
| 2013-01-31 | 201302010154AM | ND |
| 2013-02-21 | 201302220323AM | ND |
| 2013-02-21 | 201302220322AM | ND |
| 2013-04-29 | 201304300206AM | ND |
| 2013-04-29 | 201304300195AM | ND |
| 2013-06-06 | 201306070202AM | ND |
| 2013-06-06 | 201306070190AM | ND |
| 2013-07-30 | 201307310249AM | ND |
| 2013-07-30 | 201307310290AM | ND |
| 2013-08-12 | 201308130156AM | ND |
| 2013-08-12 | 201308130152AM | ND |
| 2013-10-07 | 201310080353AM | ND |
| 2013-10-07 | 201310080350AM | ND |
| 2013-10-10 | 201310110406AM | ND |
| 2013-10-10 | 201310110456AM | ND |