Naseby

The Naseby treatment plant consists of flocculation, sand filtration, UV and chlorination which provide treatment barriers for bacteria and protozoa under normal operating conditions.

The source water for Naseby is from the Hawkdun Irrigation Race, which is a surface water source. This source is vulnerable to turbidity following rain. When this occurs, the plant is shut down, treated water is supplied from reservoirs and a conserve water notice is put in place.

If the reservoir level drops to a point where untreated water is needed to refill it, then a boil water notice must be put in place until the source water clears. This typically occurs when reservoirs have about six hours storage available.

The population in Naseby varies considerably between normal population and peak population. The Naseby plant has to run continuously to produce enough treated water during peak periods. This does not provide sufficient capacity to accommodate typical maintenance outages during peak periods, or changes in the source water quality.

Investigation is underway to identify the options for increasing capacity, and providing resilience to weather events that affect the source water quality.