Council manages six reticulated schemes in the Grey District for the collection, treatment and disposal of sewage (wastewater). They are:
- Wider Greymouth area (Greymouth, Cobden, Blaketown, Boddytown)
- Karoro, South Beach, Paroa
- Iveagh Bay (Te Kinga)
Privately owned septic tanks are used in townships without reticulated schemes.
Each sewerage treatment plant is funded by a targeted rate charged to ratepayers able to connect to that scheme. The targeted rate funds the maintenance and development of wastewater storage, pipes, pumps, and treatment plant and processes.