National Drinking Water Database
National Drinking Water Database - Chemical Contaminants
Caffeine
Status: Unregulated - EPA has not established a maximum legal limit in tapwater for this contaminant.
Caffeine, a common beverage ingredient, is a key indicator of water contamination from urban waste effluent.
Detected |
Found above health guidelines |
Found above legal limit |
|
|---|---|---|---|
| States | 1 |
- |
- |
| Water utilities | 2 |
- |
- |
| People Served | 230,000 |
- |
- |
Caffeine Exposure by State
Water utilities in 1 states have reported detecting Caffeine in treated tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies.
| State | Water Suppliers with Caffeine contamination | |
|---|---|---|
| Systems | Population | |
| California | 2 | 230,000 |
| Total | 2 | 230,000 |
The Most Polluted Communities
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) |
Testing Summary for Caffeine
| Are tests routinely required for Caffeine by federal law? | No |
| Water suppliers reporting tests for Caffeine (2004-2009): | 58 of 47,576 |
| Average testing rate for water supplier reporting tests (2004-2009): | 0.6 per year |