We call them lavaderos in Spanish, pila is also used, pila is actually the water tank. and I believe I have posted at least 6 o 7 entries about the public washbasins and water tanks as I have found them around Antigua Guatemala.
The first person who can correctly list all the different posts that have a lavadero or pila will win a post card mailed directly to your home or office. You browse the All the Archives or do a search. Good luck to all participants!