Wellington Water (water supply service providers to Upper Hutt) has released the Regional Standard for Water Services a collaborative effort with the Upper Hutt, Porirua, Hutt and Wellington City Councils. The regional standard consolidates engineering standards for storm water, waste water and water supply infrastructure in the four cities.
The new standard is intended to be used for new infrastructure in subdivisions and for replacements in existing areas. It is intended to ensure all work done on water networks complies with the Council’s objectives.
More information can be viewed on the Wellington Water website.
Wellington’s water is sampled and tested in accordance with the Ministry of Health’s Drinking Water Standards for New Zealand. The standards set out the sampling rate for the population served and the tests that must be carried out on all samples.
We carry out about 5,700 samples a year, at nearly 500 sites across the four cities. Sampling rates are also determined by whether or not the water is chlorinated. As most of Hutt City’s water supply is not chlorinated, it’s subject to more sampling than water for the other cities.
Because it is impracticable to monitor water supplies for all potential pathogens (bacteria that cause disease), E. coli is used as an indicator organism for faecal contamination of drinking water.
If a sample tests positive for E. coli, the water is resampled at the original and adjacent sites, an investigation and physical inspection are carried out on the affected area, and corrective action taken. Depending on the number of bacteria (or colony forming units) counted in the sample, this could include a boil water notice being issued and a reservoir or network could be dosed with chlorine to kill any bacteria present.
Wellington Water continues to monitor and manage the water supply system to ensure its safety, and will take close note of the learnings from the events in Havelock North in 2016.
For more information please visit the Wellington Water website.
Last updated on 31 Oct 2016