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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.

StateWater Suppliers with Caffeine contamination
SystemsPopulation
California2230,000
Total2230,000

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

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)

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