Water Bore Drilling Cost per mt for completed 125mm diameter bore using best quality Australian made bore casing with a lifetime guarantee is $150 per mt, plus GST. The largest diameter casing allowed to be used for stock and domestic water bore drilling in Victoria is 125mm. We only use top quality Australian made (Certified) bore casing. Many drillers do “cheap” work using imported casing….. we offer a No Water No Charge gurantee to our clients and a lifetime guarantee on the bore casing. A Water Bore is an investment that will, if constructed properly, be still producing clean reliable water for generations into the future. Our cost includes all grouting seals packers gravel packing end caps drilling bore casing bore development, basically a completed bore with a written report, all ready for pump installation.