Water Distribution and Treatment
Water Supply Gradings
Quality standards for drinking water are set by the Ministry of Health (MoH), through the Drinking Water Standards for New Zealand. Each year the Ministry publishes a grading for every public water supply. Gradings are based on the drinking water standards and indicate how safe each water supply is from contamination.
The MoH grading system has two parts:
- A grading for the source of water and the treatment plant ("A1" to "E"). This relates to the measures taken to limit contamination of the water source and to remove any contamination that is present, by treatment. It is a rating of how safe the water is after treatment, but before it enters the distribution system.
- A grading for the distribution system ("a1" to "e"). This is based on the risk of water becoming contaminated within the local supply pipes, and the procedures in place to minimise the risk of unsafe water to consumers.
The grading range from completely satisfactory ("A1" or "a1") to completely unsatisfactory ("E" or "e").
Our source and treatment plant gradings are:
Eastern Supply Zone
Eastern Water Supply analytical result:
Raw water analysis eastern supply zone for 2021 (1) (PDF 167KB)
Raw water analysis eastern supply zone for 2021 (2) (PDF 289KB)
Supply | Distribution | |
Te Puke | ||
Muttons Bores | "B" | "b" |
Bayliss WTP | "B" | "b" |
Bush | "B" | "b" |
Pongakawa | "B" | "b" |
Western Supply Zone
The links below are for maps and water quality information
Katikati Supply Zone (PDF 295KB)
Athenree Supply Zone (PDF 224KB)
Western water supply analytical reports:
Raw water analysis western supply zone 2021(PDF 347KB)
Supply | Distribution | |
Wilson Road Bore and WTP | "B" | "b" |
Athenree Bore (x2) and WTP | "A" | "b" |
Katikati Bores (x3) and WTP | "B" | "b" |
Tahawai Bores and WTP | "B" | "b" |
Central Supply Zone
The links below are for maps and water quality information
Minden Supply Zone (PDF 308KB)
Westbay Central Supply Zone (PDF 252KB)
Central water supply analytical reports:
Raw water analysis central supply zone 2021 (PDF 250KB)
Supply | Distribution | |
Youngson Road | "B" | "b" |
Ohourere WTP | "B" | "b" |
Each year the Ministry publishes the Register of Community Drinking-Water Supplies, which lists the water supply grading for every community in New Zealand. To check the grading for your area, click on MoH water supply grading.