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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

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Contra Costa Water District
Concord, CA
200,0001 of 10.06 ppb
(0.06 ppb)
2Randall-Bold Water Treatment Plant
Oakley, Ca, CA
30,0001 of 10.06 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