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Answers to FAQ's on water chlorination

FAQ's regarding the Havelock North Water Supply.

What is the product going in? Is there ammonia in it?

The water system is being dosed with Sodium Hypochlorite. This does not contain ammonia.

What is the amount going in at the injection point?

The initial dose rate is one part per million.  This will be adjusted as the residual levels are monitored.

What is the level Council is aiming for across the system?

We are targeting a residual chlorine level of 0.7 parts per million (ppm). This will vary in the system depending on distance and location in the network.  The Drinking Water Standards allow a range residual chlorine in the reticulation from a minimum 0.2 parts per million up to 1.5 ppm.

How much is in a public swimming pool?

A public swimming pool typically has in the order of 10 times more chlorine than the water supply reticulation.

Is Council testing chlorine levels at different points across the system?

Yes, Council is testing chlorine levels at points right across the water supply reticulation system that is being chlorinated; in Flaxmere, Hastings, Bridge Pa and Havelock North. The same testing regimes will apply as more Council-owned supplies are chlorinated.

What are the levels used in the tankers supplying water in Havelock North?

The residual chlorine levels in the water tankers range from 0.4 to 0.9 ppm.

When did we last have to chlorinate the water, where, and for how long?

The Havelock North supply was chlorinated for two weeks in June after a mains pipe burst. Prior to that, the last chlorination of the system was 18 months ago in response to a positive e-coli indicator test.

When will the fluoride-free taps be back on?

The fluoride free taps will be back on once Council and the health authorities are certain that there is no risk of contamination.

How long will the boil water notice be on in HN (estimated)?

The boiled water notice will remain in place until Council and the health authorities are certain that the risk of contamination has passed. **Please note, the boil water notice was removed for Havelock North Saturday 3 September 2016.

Is council testing both supplies daily for any contamination? What about other Council-owned supplies?

Yes, water testing is being carried out on a daily basis in the Havelock North and Hastings water supply systems. Other Council-owned systems across the district are being tested as required by the drinking water standards

How long will daily testing continue?

Daily testing will remain in place until Council and the health authorities are certain that there is no risk of contamination. 

4 October 2017

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