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National Drinking Water Database

Contra Costa Water District Utilities - Concord, CA

Serves 200,000 people

Ethyl-t-butyl ether (ETBE)

Ethyl-t-butyl ether is a synthetic chemical used as a fuel additive and an octane enhancer for gasoline.
This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is
0 days
Test Days Exceeding Legal LimitsNumber of days in which the samples taken in that day exceed the Maximum Contaminant Level (Depending on the contaminant and its MCL, that may or may not trigger an MCL violation. Some MCLs are based on averages spanning several months to a year)
0 days
Test DaysNumber of days in which this chemical has reported results in the data we received from the State
12 days
Tests ConductedNumber of individual tests done for this contaminant
18 tests

Testing Summary

Health Limit
Legal Limit

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
Ethyl-t-butyl ether (ETBE)Ethyl-t-butyl ether is a synthetic chemical used as a fuel additive and an octane enhancer for gasoline.0 ppb
0 ppb
NoLegal at any levelThis is the Federal Limit. State Limits may be lower.
NOTE: Each dot in the above graph represents one month.
* Water utilities are noted as exceeding the legal limit if any test is above the maximum contaminant level (MCL). Most MCLs are based on annual averages so exceeding the MCL for one test does not necessarily indicate that the system is out of compliance.

Health Based and Legal Limits for Ethyl-t-butyl ether (ETBE)

Health Based Limits for Ethyl-t-butyl ether (ETBE)

There are no health based standards that EWG is using for this chemical

Testing Results

Testing DateAverage
Samples taken that dayNumber of Non-DetectsRange of Results
2008-10-080 ppb110 ppb
2008-10-070 ppb110 ppb
2008-10-060 ppb330 ppb
2007-12-110 ppb110 ppb
2005-04-050 ppb220 ppb
2005-04-040 ppb220 ppb
2005-03-310 ppb110 ppb
2005-03-210 ppb110 ppb
2004-03-150 ppb110 ppb
2004-01-070 ppb110 ppb
2004-01-060 ppb110 ppb
2004-01-050 ppb330 ppb