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Monday 26 February 2018
connected to the Methven water supply are being encouraged to continue boiling
their water, as Ashburton District Council investigates discolouration in the
supply that has been detected today.
issued a precautionary boil water notice for the scheme on Tuesday 20 February
due to high levels of turbidity (cloudiness) in the supply. Today, the water is
presenting with a yellow discolouration, and Council Assets Manager Andrew
Guthrie says this is being looked into.
we aren’t yet certain of the cause, it is expected that it will relate to the
recent heavy rainfall events in the catchment where the Methven water supply is
sourced. We will provide more information when we know more, and in the
meantime we’d urge residents to please continue boiling their drinking water,
and any water used in food preparation or for hygiene purposes.”
precautionary boil water notice was issued on Tuesday last week as the deluge
from Cyclone Gita began increasing turbidity levels. Metservice reports that
Methven received more than 100 millimetres of rain during the event.
periods of very heavy rain, turbidity of the source water increases to a level
which reduces the effectiveness of the UV equipment that we use to treat the
water. Since the end of last week, turbidity has returned to a lower level,
however a colour is now evident and this is also affecting the UV system. We
are unable to lift the notice until water has returned to normal.
water notices are necessary during these times because we cannot be certain
that treatment equipment is fully effective. The Methven supply typically copes
with some heavy rainfall events, however when the amount of rainfall reaches
the levels we saw last week, that’s when turbidity levels may become a problem.
current treatment system design was based on a very stable water source that
existed prior to the gallery upgrading. The treatment system is challenged by
these very high rainfall events and we have been actively investigating options
that will address this particular issue. However, it is extremely complex and
we need to be sure that any further investment in equipment is going to do the
Methven precautionary boil water notice will remain in place until further