Waste H2O (Otago) Traditional Cache

Just along the road from here is the Green Island wastewater treatment plant. There is plenty of parking space off the main road. The cache is hidden out of sight but the main road is a busy one so stealth may be needed. Please ensure you roll the logbook back up and secure with the rubberband otherwise it will be difficult for the next person to remove the log. Also please make sure you screw the lid on tightly - all the way down.

There are a number of wastewater treatment plants in Dunedin and this one serves the Green Island area. Grit and plastics etc within the wastewater are removed by grit traps and 1mm milli-screens. The wastewater then goes through several processes before it reaches the secondary treatment process of UV disinfection. 

After several more processes, including aeration tanks, sludge tanks, thermophylic and mesophylic digesters, the wastewater eventually is diffused at the end of an 850m long ocean outfall. The DCC website offers more information for those who are interested.