Skip to content. | Skip to navigation.

Navigation

Appendix 1: Technical information about drinking water supply in the eight local authorities

Local authorities: Planning to meet the forecast demand for drinking water.

The information in this Appendix is for those readers interested in technical detail about the supply of drinking water in the eight local authorities. It includes:

  • factors that drive demand, such as population growth;
  • a summary of our conclusions about aspects of each local authority's water supply systems that may affect their capacity to manage their drinking water, for example, whether they have access to enough source water and whether they are able to forecast demand accurately; and
  • technical data, such as the number of water supply systems and populations served, the amount of water produced and consumed, and costs of supplying drinking water.
Local authority Tauranga City Council Nelson City Council Tasman District Council Kapiti Coast District Council
Location Tauranga City Council. Nelson City Council. Tasman District Council. Kapiti Coast District Council.
Population (2006) 103,632 42,888 44,625 46,200
Population growth rate (2001-06) +14.4% +4.2% +7.6% +9.2%
Number of water supply systems 1 1 16 4
Access to water sources

(security and quantity of water available)
Existing supply secure but needs more to provide for future growth

Uses surface water for supply
Uses surface water for supply Uses a mix of groundwater and surface water sources for supplies Uses surface water and groundwater for supplies
Quality of drinking water

(ability to comply with the drinking water standards)
Currently ungraded

Previously graded Aa but requires minor upgrades to comply with the latest drinking water standards
Currently graded Ab

Planning to improve distribution grading
Currently ungraded and requires upgraded infrastructure (additional filtration and disinfection) to comply Currently ungraded and requires upgraded infrastructure (installation of UV treatment) to comply
State of the distribution network No specific reticulation or efficiency issues

Has an active leakage management programme
The pipeline between source and treatment facility is ageing and at risk of failure

Trunk watermains and reservoirs need extensions and additions to meet growth demand

Reticulation condition requires continuous monitoring and maintenance/ replacement
Possible high leakage in some supplies

No current leak detection programme but planning to develop
Consumption levels tend to be high

Possible high leakage in Otaki

Ongoing leak detection programme but still to accurately quantify extent of leakage

Local authority Opotiki District Council Christchurch City Council Central Otago District Council South Taranaki District Council
Location Opotiki District Council. Christchurch City Council. Central Otago Disctrict Council. South Taranaki District Council.
Population (2006) 8973 348,435 16,647 26,487
Population growth rate (2001-06) –1.5% +8.6% +16.4% – 4.4%
Number of water supply systems 3 9 9 13
Access to water sources

(security and quantity of water available)
Uses surface water for supplies Groundwater used for Christchurch City supply, and a mix of groundwater and surface water used for Banks Peninsula supplies Uses mix of surface water and groundwater for supplies

Possible pressure when resource consents for surface water takes are due for renewal because consumption is very high
Uses surface water for supplies

Pressure on supply from drought, and surface water in some catchments is at or near full allocation
Quality of drinking water

(ability to comply with the drinking water standards)
Currently ungraded and requires upgraded infrastructure (UV treatment) to comply Currently graded Ba and Da for Christchurch City and Ee for Banks Peninsula supplies

Requires upgraded infrastructure to comply in Banks Peninsula and may invest in new infrastructure to improve grades for Christchurch City

Managing risk of contamination is critical because supply is untreated
Currently ungraded and requires upgraded infrastructure (treatment plants) to comply Currently ungraded and requires upgraded infrastructure (treatment plants) to comply
State of the distribution network Possible high leakage, does not have an active leak detection programme but is planning to develop one No specific reticulation or efficiency issues

Has an active leakage management programme
Consumption tends to be high

High leakage possible in all supplies, started a leak detection programme but still to accurately quantify extent of leakage

Current water supply systems are energy intensive

Reticulation system for pumping water from source to reservoir produces very high pressure in some properties
Consumption tends to be high

Possible high leakage in all supplies, started a leak detection programme but still to accurately quantify extent of leakage

Infrastructure upgrades are required to manage risk, increase resilience, and improve the efficiency of the systems

Local authority Tauranga City Council Nelson City Council Tasman District Council Kapiti Coast District Council
Capacity to forecast demand Forecasting reasonably detailed and likely to be accurate
Forecasting reasonably detailed and likely to be accurate
Forecasting reasonably detailed and likely to be accurate
Forecasting adequate but data could be improved
Planning for future demand
Future demand cannot be met with existing water supply

Investing in new supply to meet forecast future demand

Uses universal water metering and charging plus a number of other initiatives to manage demand
Future demand can be met with existing supply

Uses universal water metering and charging to reduce demand
Future demand cannot be met with existing supply

Strategy to meet demand is based on supply augmentation

Uses universal water metering and charging to reduce demand in all urban supplies, which is about 90% of the total number of water users
Existing supply is generally sufficient to meet future demand now; but, in some parts of the district, by 2015/16, summer demand is projected to exceed the amount that can be legally taken under resource consents

Has decided to increase supply

Committed to reducing consumption and uses voluntary conservation to reduce demand
Attracting and retaining
skill base (capability
       
Expenditure on drinking
water supply
Water supply funded by user fees and charges

LTCCP budgets $227,658,000 over the period 2009-19 on capital expenditure
Water supply funded by user fees and charges

LTCCP budgets $46,653,000m over the period 2009-19 on capital expenditure
Water supply funded by targeted rates and user fees and charges

LTCCP budgets $76,953,459 (inflated) over the period 2009-19 on capital expenditure
Water supply funded by targeted rates

LTCCP budgets $60,193,000 over the period 2009-19 on capital expenditure
Total annual drinking water supply rates and charges (2009/10) $14,683,000 $10,109,000 $5,526,697 $6,646,000
Total annual drinking water supply production 13,258,278m3 14,636,500m3 5,525,005m3 7,446,000m3
Volumetric price of drinking water $1.20 per m3 $0.70 per m3 $0.99 per m3 $0.89 per m3
Value of water supply assets

(30 June 2009)
$175,205,000 $129,537,000 $84,028,000 $68,295,000

Local authority Opotiki District Council Christchurch City Council Central Otago District Council South Taranaki District Council
Capacity to forecast demand Forecasting limited
Forecasting currently limited by incomplete data, but developing a demand-forecasting model
Forecasting limited by incomplete data

Particularly needs accurate water consumption data
Forecasting limited by incomplete data

Particularly needs accurate water consumption data
Planning for future demand
Future demand in terms of quantity can be met with existing supply over the next 10 years

Has universal metering and charging and developing other conservation measures
Future demand can be met
with existing water supply until about 2050

Few tools currently used for reducing demand

Uses universal metering but charges only commercial and industrial consumers

Currently preparing a water supply strategy for 2009-39 that includes more demand management tools
Poor position to effectively manage future demand for water supply but has adopted the Central Otago Drinking Water Strategy 2007 which, if implemented, should improve the situation

Currently has some tools for reducing demand and is progressively implementing metering and charging
Poor position to effectively manage future demand for water supply but has adopted District Water Supply Strategy 2007 which, if implemented, should improve the situation

Currently using some tools for reducing demand including working with farmers, education, and introducing metering
Attracting and retaining
skill base (capability
Identified as a problem – hard to attract suitable staff   Identified as a problem – also making provision for training a problem  
Expenditure on drinking
water supply
Water supply funded by a targeted rate with a fixed component and a variable component based on actual consumption

May be difficult to raise more revenue through the limited rating base

LTCCP budgets $1,114,000 over the period 2009-19 on capital expenditure
Water supply funded by targeted rate

LTCCP budgets $157,639,000 (inflated) over the period 2009-19
Water supply funded by targeted rates

Affordability and funding of upgrades, relying on approval of government subsidies

LTCCP budgets $51,326,977 over the period 2009-19 on capital expenditure
Water supply to be funded by loans, with uniform annual charges and metered water rates (where properties are metered) covering the interest and principal over time

LTCCP budgets $81,079,000 over the period 2009-19 on capital expenditure
Total annual drinking water supply rates and charges (2009/10) $720,000 $22,197,000 $2,538,508 $7,836,000
Total annual drinking water supply production 602,250m3 54,300,000m3 5,269,631m3 15,695,000m3
Volumetric price of drinking water $1.22 per m3 $0.41 per m3 $0.48 per m3 $0.50 per m3
Value of water supply assets

(30 June 2009)
$9,839,000 $342,918,000 $41,502,000 $77,413,000

Local authority Tauranga City Council Nelson City Council Tasman District Council Kapiti Coast District Council
Population served by each supply system (at March 2009) Tauranga City (103,783) Nelson City (43,000) Collingwood (450)
Dovedale (450)
Eighty Eight Valley (200)
Hamama Road (50)
Hope/Brightwater (2000)
Kaiteriteri (300)
Motueka (1200)
Murchison (680)
Pohara (150)
Redwood Valley (550)
Richmond (10,500)
Tapawera (400)
Upper Takaka (50)
Waimea Industrial/Mapua/
Ruby Bay (1680)
Wakefield (1500)
[Three of these – Redwood Valley, Eighty Eight Valley and Dovedale – are rural water supplies]
Hautere/Te Horo (700)
Otaki (5700)
Paekakariki (1700)
Paraparaumu/ Waikanae (31,900)
Average drinking water consumption in litres per person per day (lpd) 198 (residential only)
270 (all users)
180 (residential only)
500 (all users)
250-375 for larger supplies
125-250 for smaller supplies
Paraparaumu/Raumati – 404
Waikanae – 543
Hautere/Te Horo – (no data)
Otaki – 763
Paekakariki – 450
Other information The port is a significant part of Tauranga's economy, while horticulture and agriculture are the main drivers of the Western Bay of Plenty's economy Urban district – the main drivers of the regional economy are its horticulture, pastoral production, forestry, seafood, and tourism sectors Semi-rural – fruit growing, farming, fishing, and forestry are the main economic contributors to the district's economy

Viticulture and tourism are
other important industries
Rural-urban – changed from a series of holiday settlements and farming areas into a rapidly urbanised and popular district

Kapiti is the fastest growing district in the Wellington region

Local authority Opotiki District Council Christchurch City Council Central Otago District Council South Taranaki District Council
Population served by each supply system (at March 2009) Ohiwa (50)
Opotiki (5100)
Te Kaha (150)
Akaroa (1350)
Birdlings Flat (240)
Christchurch Central (311,000)
Duvauchelle (440)
Little River (240)
Lyttelton (3720)
Pigeon Bay (50)
Takamatua (280)
Wainui (320)
Alexandra (5000)
Clyde (1000)
Cromwell (3400)
Lake Roxburgh Village (90)
Naseby (400)
Omakau/Ophir (400)
Patearoa (60)
Ranfurly (1000)
Roxburgh (700)
Cold Creek/Pihama (470)
Eltham (2200)
Hawera (9771)
Inaha (490)
Nukumaru (< 50)
Opunake (1500)
Patea (1400)
Pope Rural Scheme/Riverlea (50)
Pungarehu (< 60)
Rahotu (120)
Wai-inu Beach (300)
Waimate West (4500)
Waverley (950)
Waverley Beach (300)
[Five of these are rural water supplies]
Average drinking water consumption in litres per person per day (lpd) 300 435 Alexandra – 855
Cromwell – 605
Clyde – 991
Omakau/Ophir – 803
Naseby – 228
Ranfurly – 661
Patearoa – 1169
Roxburgh – 488
Lake Roxburgh Village – 875
408 (excluding farms)
888 (including farms)
Other information Rural district – the economy is primarily driven by agriculture, including beef, dairy, forestry, and horticulture (kiwifruit)

Economic growth is a priority area for the Council
Urban district – water supply is used primarily for residential, commercial, and industrial uses Rural district, with rural or primary industries providing the backbone of the economy Rural – the economy is based on dairy farming, with the oil and gas sector and engineering support industries also important
page top
Report details

Local authorities: Planning to meet the forecast demand for drinking water

ISBN 978-0-478-32635-2