0 4 , ▁respectively . ▁As ▁of ▁ 2 0 0 7 , ▁ 2 5 ▁states ▁had ▁issued ▁complete ▁or ▁partial ▁b ans ▁on ▁the ▁use ▁of ▁M T BE . ▁ ▁The ▁Energy ▁Policy ▁Act ▁of ▁ 2 0 0 5 ▁prompt ed ▁gas oline ▁ref in ers ▁to ▁transition ▁to ▁the ▁use ▁of ▁eth an ol ▁as ▁a ▁gas oline ▁add itive , ▁in ▁place ▁of ▁M T BE . ▁ ▁Notable ▁inc idents ▁in ▁the ▁United ▁States ▁ ▁Fall ston , ▁Maryland ▁ ▁Har ford ▁County , ▁Maryland , ▁found ▁M T BE ▁in ▁well s ▁near ▁several ▁of ▁its ▁filling ▁stations ▁beginning ▁in ▁ 2 0 0 4 . ▁This ▁led ▁the ▁state ▁of ▁Maryland ▁to ▁make ▁moves ▁to ▁ban ▁M T BE . ▁ ▁In ▁ 2 0 0 5 , ▁an ▁Ex x on - M obil ▁station ▁in ▁Fall ston , ▁Maryland , ▁was ▁found ▁to ▁be ▁le aking ▁M T BE ▁into ▁the ▁local ▁well s . ▁The ▁discovery ▁resulted ▁in ▁the ▁station ▁being ▁ab rupt ly ▁closed . ▁Ex x on - M obil ▁referred ▁to ▁the ▁closure ▁as ▁a ▁" bus iness ▁decision ". ▁Following ▁the ▁closure , ▁M T BE ▁levels ▁in ▁the ▁area ▁dropped . ▁ ▁In ▁September ▁ 2 0 0 4 , ▁Har ford ▁County ▁placed ▁a ▁six - month ▁mor ator ium ▁on ▁construction ▁of ▁filling ▁stations . ▁ ▁Jackson ville , ▁Maryland ▁ ▁In ▁ 2 0 0 6 , ▁the ▁well s ▁of ▁a ▁neighborhood