The Power of Information

National Drinking Water Database


MTBE in Maryland


MTBE (methyl tert-butyl ether) is a fuel additive that had been used as an octane enhancer in unleaded gasoline; it contaminates groundwater due to spillage or leakage at gas stations, and has been banned or scheduled for phaseout in most states.

The Most Polluted Communities in Maryland

43 water utilities reported detecting MTBE in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average MTBE level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Chestertown
Chestertown, MD
5,4007 of 713.73 ppb
(6.8 to 29.5 ppb)
2City of Aberdeen
Aberdeen, MD
14,5009 of 129.21 ppb
(0 to 51 ppb)
3Crystal Beach Manor/T&c Utility
Timonium, MD
5001 of 18.5 ppb
(8.5 ppb)
4Briddletown Distribution System
Berlin, MD
1502 of 24.85 ppb
(4.2 to 5.5 ppb)
5Whispering Pines Mobile Home Park
Elkton, MD
3251 of 13.85 ppb
(3.85 ppb)
6Sunset Lakes Mobile Home Park
Berlin, MD
1201 of 13 ppb
(3 ppb)
7Gateway Village Mobile Home Park
Delmar, MD
601 of 12.4 ppb
(2.4 ppb)
8Lakeview Village Mobile Home Park
Reisterstown, MD
762 of 22.35 ppb
(0.8 to 3.9 ppb)
9Town of Berlin
Berlin, MD
3,9452 of 32.07 ppb
(0 to 4.6 ppb)
10Bay Country Estates Mobile Home Park
Elkton, MD
2763 of 32 ppb
(0.6 to 4 ppb)

Health Based Limits for MTBE

StandardDescriptionLevel
California Public Health GoalsDefined by the State of California Office of Environmental Health Hazard Assessment (OEHHA) as the level of contaminant that is allowed in drinking water. For acutely toxic substances, levels are set at which scientific evidence indicates that no known or anticipated adverse effects on health will occur, plus an adequate margin-of safety. PHGs for carcinogens or other substances which can cause chronic disease shall be based solely on health effects without regard to cost impacts and shall be set at levels which OEHHA has determined do not pose any significant risk to health.13 ppb

Violation Summary for MTBE in Maryland

There are no violations reported for this contaminant in Maryland