I don't know if you can get plumbers through Adecco. Give it a whirl. I know there's one in Gastonia (it deals with more of what you're looking for) and on on Tryon (this one deals with more office type jobs).

Also try The Clover Herald, Fort Mill Times, The Rock Hill Herald, Lake Wylie Pilot. I don't know what the York newspaper is but York County is close enough to Charlotte.