The Power of Information

National Drinking Water Database

MTBE in New Hampshire

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 New Hampshire

228 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
1Pitco West
24011 of 110.02 ppb
(0.01 to 0.03 ppb)
2Grappone Honda
4013 of 190.02 ppb
(0 to 0.06 ppb)
3Pine and Pond Mobile Home Park
Epping, NH
18610 of 110.01 ppb
(0 to 0.02 ppb)
4Hampstead Shoppers Village
7512 of 130.01 ppb
(0 to 0.04 ppb)
5Kingstowne Mobile Home Park
Epsom, NH
33518 of 20< 0.01 ppb
(0 to 0.02 ppb)
6Amazon Park
Rochester, NH
11014 of 18< 0.01 ppb
(0 to 0.05 ppb)
7Conway Town Hall
10013 of 21< 0.01 ppb
(0 to 0.03 ppb)
8Branch River Apts
Raymond, NH
12013 of 18< 0.01 ppb
(0 to 0.04 ppb)
9Continental Biomass Industries
606 of 8< 0.01 ppb
(0 to 0.02 ppb)
10Scandia Plastics Inc
505 of 11< 0.01 ppb
(0 to 0.02 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 New Hampshire

There are no violations reported for this contaminant in New Hampshire