Contact Natural Resources for advice. It is likely that the screens or slots of the bore have been blocked and remedial work will be required over the bore. After 24 hours pumping check that the discharge is clear. If so, a tank can be filled for treatment with chlorine. Clean all sediment from inside of tank.
Part fill the tank with water.
When mixed run all taps until chlorine can be detected. Close taps and allow the chlorinated water to stand in the pipes for 4 hours. Drain the tank and the plumbing. Fill the tank with water adding 1.5 grams of granulated chlorine per 1000 litres. Flush the plumbing with this water.