A water well drilling rig is a heavy drill rig equipment, and it is mostly used for drilling a water well borehole to get the underground pure water out of the earth for drinking or for irrigation purpose. A water well drilling rig is a hydraulic type drill rig which is powerful and very popular in the market, and there are many types of water well drilling rig, hydraulic water well drilling rig, crawler water well drilling rig, and wheel trailer type water well drilling rig.