I use this guy:
Rafael, 809 834 3200
I pay him 1500 pesos. They bring a pump to empty the cistern, but you might want to shut the valve for a few days to not have all those gallons of water spilled.
He cleans my tinaco also, I think for 500 pesos
I'm in Las PraderasThanks for the contact! Quick question, where abouts in S.D. are you... Dont want to waste the guys time if he's based too far away.