History of Water Network

The modern, clean and reliable water supply that Wellingtonians enjoy today is a far cry from the drinking water available to our early settlers.

In the Old Days

Karori Reservoir

When Wellington became the Capital in 1865, the Government began laying the first water mains from springs in Tinakori Rd. Before this settlers relied on wells, springs, streams and rainfall to meet their water needs.

In 1871 James Hector reported to the Water Supply Committee that “no water collected from within the crowded part of the city, from either wells or house tops, is safe or proper for human consumption”.

The Lower Karori Dam was then built as an answer to the city’s water problems.

By 1878 the city was experiencing severe water shortages due to rapid population growth and low rainfall. Wainuiomata River was chosen as an adequate and reliable source for more water.

By 1900 demand was again exceeding supply, and two new dams were commissioned: the Upper Karori Dam was completed in 1908 and the Morton Dam (Wainuiomata) in 1911.

In 1919 water shortages were again an issue and water from the Orongorongo River was piped to Wainuiomata via a 3.2km tunnel.

When City Council Arrives

In 1927 the Wellington City and Suburban Water Board was created by a Parliamentary Act, vesting Wellington City Council with the Hutt, Akatarawa, Whakatiki and Pakuratahi watersheds. A new scheme to draw water from the Hutt River was proposed but Petone and Lower Hutt rejected the idea, withdrew from the Water Board, and developed the artesian (aquifer) supplies they still use today.

By 1943 the Hutt River scheme was developed largely due to Government assistance. The Kaitoke weir was built and a 56km pipeline connected it to the Lower Karori Reservoir.

By 1953 water-borne diseases had greatly reduced but there were still complaints about water quality. Chlorination plants were built at Wainuiomata, Karori and Kaitoke, and in 1965 fluoride was added to supplies sourced from the Hutt and Wainuiomata Rivers to improve dental health.

When Regional Council Arrives

In 1973 the Government required water resources to be managed on a regional basis, and so the Wellington Regional Water Board was formed. In 1980 this gave way to the Wellington Regional Council which assumed responsibility for the collection and treatment of water for the greater Wellington area.

The Te Marua storage lakes and treatment plant were opened in 1987, and the now redundant Morton Dam was decommissioned a year later due to earthquake risk. In 1992 the Upper Karori Reservoir was closed due to the same concerns.

The Wainuiomata Treatment Plant was opened in 1993. In 1998 the Karori reservoirs, no longer in use as a water supply, were turned into the Karori Wildlife Sanctuary. The water in the dams is still retained as a water supply in the case of an emergency.

In 2004 Wellington City Council collaborated with Hutt City Council to establish Capacity, a non-profit organisation which now maintains the water, sewerage and stormwater infrastructure for both councils.

Related Links

• Karori Wildlife Sanctuary website

Department Details:
Capacity (Wellington Water Management Ltd)