Regular testing
To meet the requirements of the National Drinking Water Standards, we carry out regular testing at each of our treatment plants and across the water supply zones. These tests follow a set schedule and help us ensure your water stays safe and compliant.
What do we test for?
Testing varies depending on the site, but typically includes both laboratory and on-site checks. Lab samples—often tested for E. coli—are collected from plants and key points in the network, such as reservoirs or the outer edges of the supply zone. We also test for things like lead and nitrate. On site, our teams routinely check chlorine levels, pH, and turbidity (which measures how clear the water is).
Real-time monitoring
All of our treatment plants are connected to a remote telemetry system that allows us to monitor their performance online. If something goes wrong, the system triggers an alert and sends a text to our on-call staff, so they can respond immediately.
How does testing work?
Grab samples are collected by a qualified technician from various locations throughout the water distribution network to ensure representative monitoring of water quality.
Microbiological Testing in the reticulation
Samples are analysed for E. Coli and Total Coliforms (bacteria) at the laboratory.
- For larger towns (Dannevirke, Woodville, Pahiatua and Eketāhuna), these samples are taken weekly.
- For smaller towns (Norsewood, Pongaroa and Ākitio), samples these are taken monthly.
Free Available Chlorine (FAC)
Free Available Chlorine levels (he portion of chlorine in water that is active and available to disinfect) are monitored to ensure adequate disinfection.
- For larger towns, FAC readings are taken three times per week.
- For smaller towns, FAC readings are taken twice per week.
Sampling Frequency Determination
The number of samples required is determined by the population served by the supply scheme, in accordance with the Drinking Water Quality Assurance Rules. These regulations specify the minimum sampling frequency based on population size and water supply category.
What happens if something is detected in the water?
When something is detected in the water which compromises our supply, a boil water notice is used to safeguard health.
A boil water notice does not necessarily mean that tap water will make everyone seriously ill, but it does mean the water does not meet the New Zealand drinking water standards, and it is likely that there are harmful microorganisms (pathogens) in the water.
For more information on boil water notices, check out Boil Water Notices | Tararua District Council