ALTDEV ALT EXCURSION FROM ASSIGNED AS PIC FLC RESPONDS TO GPWS WARNING WHILE PROX TO GND.

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WHILE LINING UP ON FINAL APCH FOR ILS RWY 33 AT BGR; WE WERE APPROX 6-7 MI FROM TOTT IAF ON STRAIGHT-IN APCH. WE WERE LEVEL AT 2300 FT UNDER RADAR VECTORS FOR APCH. AT THIS POINT; WE STARTED TO RECEIVE A 'TERRAIN; TERRAIN' WARNING FROM GPWS; WHILE STILL IN LEVEL FLT. FO WAS FLYING APCH; AND I IMMEDIATELY ORDERED 'TOGA' (TKOF/GAR THRUST); AND THEN TO LEVEL AT 3000 FT MSL. WE WERE STILL BELOW THE GS AND DID; IN FACT; REGISTER A RADIO ALT OF ABOUT 1000 TO 1100 FT ABOVE TERRAIN. WE ADVISED CTLR OF OUR CLB AND HE SAID IT WAS OKAY TO CONTINUE; AND CLRED US FOR APCH. IT WAS UNEVENTFUL FROM THAT POINT TO TOUCHDOWN. AFTER LNDG; I HAD A RADIO CONVERSATION WITH TWR CTLR; AND ADVISED HIM OF WHAT HAD HAPPENED. HE SAID THAT HE HAS RECEIVED A COUPLE OF OTHER RPTS/COMPLAINTS ABOUT THE SAME THING RECENTLY; AND DID ADVISE US THAT THE MVA FOR THAT AREA WAS 2300 FT. I THINK THAT BECAUSE OF THE APPARENT HILLS THERE THAT CREATED THE RAPID RISE ON THE RA AND CAUSING SUBSEQUENT ALERTS; EITHER THE FAA SHOULD RAISE THE MVA FOR THAT SECTOR; OR AT LEAST PUT OUT A NOTICE TO CREWS FLYING INTO BGR TO BE AWARE OF WHAT TO POTENTIALLY EXPECT THERE.