Someone on the local message board mentioned Melaque didn't have a water tower in a conversation about water supply and pressure. I'd heard a number of times there is a large cistern on top of the hill just off the highway - the one with the cave. Nobody seemed to know if it was still being used so I decided to walk up the other day.
The access road, with locked gate, is off the road to Pinal Villa. Easy to slip thru the barbed wire. The road makes about 3 switchbacks before you see the pipe heading for Melaque. You can hear water running in the pipe as well as one of the large water tanks. There could be some nice views from up there but I would suggest shoes, long pants and maybe a machete.
Pipe headed for Melaque
One of the two tanks
Water entering one of the tanks