National Drinking Water Database
Caffeine in California
Caffeine, a common beverage ingredient, is a key indicator of water contamination from urban waste effluent.
The Most Polluted Communities in California
2 water utilities reported detecting Caffeine in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies
Ranked by highest average Caffeine level
| Rank | System | Population Served | Positive test results of total reported tests | Average Level (Range) |
|---|---|---|---|---|
| 1 | Contra Costa Water District Concord, CA | 200,000 | 1 of 1 | 0.06 ppb (0.06 ppb) |
| 2 | Randall-Bold Water Treatment Plant Oakley, Ca, CA | 30,000 | 1 of 1 | 0.06 ppb (0.06 ppb) |
Health Based Limits for Caffeine
There are no health based standards that EWG is using for this chemical
Violation Summary for Caffeine in California
There are no violations reported for this contaminant in California