The Power of Information

National Drinking Water Database

MTBE in Rhode Island

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 Rhode Island

18 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
1E. Searles Ball Memorial Housing
Block Island, RI
316 of 64 ppb
(3 to 5.7 ppb)
2Pascoag Utility District, Water Division
Pascoag, RI
3,5001 of 93.44 ppb
(0 to 31 ppb)
3Touisset Point Water Trust
Warren, RI
2253 of 52.56 ppb
(0 to 8.3 ppb)
4Indian Cedar Mobile Home Park
Charlestown, RI
2002 of 61.53 ppb
(0 to 7.45 ppb)
5Lawrence Sunset Cove Association
Tiverton, RI
3610 of 101.52 ppb
(0.59 to 3.3 ppb)
6Scituate Commons
North Scituate, RI
385 of 61.35 ppb
(0 to 1.8 ppb)
7Paige Associates
Coventry, RI
967 of 81.01 ppb
(0 to 1.4 ppb)
8Echo Lake Water District
Chepachet, RI
2001 of 70.63 ppb
(0 to 4.4 ppb)
9Heritage Park Home Co-Operative
Tiverton, RI
602 of 50.58 ppb
(0 to 1.8 ppb)
10Eleanor Slater Hospital/Zambarano Unit
Pascoag, RI
5402 of 80.55 ppb
(0 to 2.3 ppb)

Health Based Limits for MTBE

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 Rhode Island

There are no violations reported for this contaminant in Rhode Island