drainage rock average cost
- Washed 1 1/2 Drain Rock: $17.80/yd or $19.30/ton. This product is commonly used in DEC septic systems and drain fields. 1 1/2 drain rock can also be used as a road topping or anywhere else drainage is needed. Washed 3/4 Rock: $25.40/yd or $24.00/ton. This product makes a great driveway/pathway topping. When placed near entrances and garages, 3/4 rock helps to reduce dust and mud and creates a clean, finished look.