D328 CREW HAD SMOKE IN THE CABIN ON TAXI OUT. THE ACFT WAS EVACED.

Narrative

WHILE TAXIING OUT FOR TKOF TO RWY 21C; FLT ATTENDANT CONTACTED FLT DECK TO RPT THAT THERE WAS SMOKE IN THE CABIN. I ASKED HER IF IT WAS SMOKE OR CONDENSATION. SHE STATED IT WAS SMOKE. I ASKED HER IF SHE COULD IDENT THE SOURCE. APPROX 5-10 SECONDS LATER; WE RECEIVED A 'SMOKE LAVATORY' MESSAGE. I INFORMED THE CREW THAT WE WOULD BE EVACING THE ACFT. I BROUGHT THE ACFT TO A STOP IN A RUNUP AREA. (MY THOUGHT WAS TO PUT SOME DISTANCE BTWN MY ACFT AND THE OTHER ACFT NEAR US SO PAX WOULD NOT BE EXITING INTO OR NEAR THE JETBLAST OF OTHER ACFT.) I INITIATED THE GND EVAC PROC AND INFORMED ATC THAT WE HAD SMOKE IN THE CABIN AND WERE EVACING THE ACFT. AFTER ACFT WAS SECURED; I PASSED THROUGH THE CABIN AND EXITED THROUGH THE AFT GALLEY DOOR INSURING NO PAX OR CREW WERE STILL ON BOARD ACFT. I DID NOTICE A MODERATE AMOUNT OF WHITE SMOKE IN THE UPPER AREA OF THE CABIN. ALL ONBOARD EXITS WERE USED AND NO INJURIES WERE RPTED BY PAX OR CREW. POSSIBLE DAMAGE OCCURRED TO THE EMER EXIT HATCHES. THERE WERE 31 PAX AND A CREW OF 3. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: CREW WAS FLYING A DO328 ACFT. THE COMPANY DID NOT INFORM THE CAPT WHAT THE PROB WAS. THE RPTR HAS ALERTED HIS UNION AIR SAFETY REPRESENTATIVES. THE RPTR HAS SINCE FLOWN THIS ACFT WITH NO FURTHER PROBS. AT THE TIME OF THE FLT; THE MAINT LOG PAGE DESCRIBING THE PROB AND MAINT CORRECTIVE ACTION HAD BEEN REMOVED. THE PLT CONTACTED HIS CHIEF PLT; BUT GOT NO INFO.