News Video | Policy | GPs | Hospitals | Medical | Mental Health | Welfare | Search


Health warning for SH1 on Hurunui River lifted


April 3, 2014

Health warning for SH1 on Hurunui River lifted

The Community and Public Health division of the Canterbury District Health Board has lifted its algal bloom health warning issued for State Highway One (SH1) on the Hurunui River / Rakahuri. This was issued on the 26 February 2014.

Recent surveys at SH1 on the Hurunui River / Rakahuri have shown the cover of potentially toxic blue-green algal mats (benthic cyanobacteria) in the river has decreased and cover is now below the levels that are of concern to public health.

Dr Alistair Humphrey, Canterbury Medical Officer of Health, says Environment Canterbury’s sampling for the summer season has now stopped and therefore the public will need to be aware of the potential for algal blooms themselves.

“The growth of algal mats is, however, less likely because of the cooler weather and the seasonal nature of the blooms,” Dr Alistair Humphrey says.

“Environment Canterbury will resume sampling again next summer when there is an increased likelihood of cyanobacterial growth.”

Facts about cyanobacteria:

• Appears as dark brown/black mats attached to rocks along the riverbed.
• The algae occur naturally but can increase rapidly during warmer months.
• It often has a strong musty smell and algal toxin concentrations can vary over short periods with changing environmental conditions.
• Although high river levels will remove the algal bloom, detached mats can accumulate along the shore and increase the risk of exposure to toxins.
• If a health warning is in place avoid contact with the water.
• Although district or city councils may place warning signs, these may not be seen at the numerous river access points, hence the need for people/ dog-walkers to treat every low-flowing river cautiously.
• Exposure to an algal bloom can cause skin rashes, nausea, stomach cramps, tingling and numbness around the mouth and fingertips. If you experience any of these symptoms visit your doctor immediately and please let your doctor know if you have had contact with lake water when there is a health warning in place.

For further information visit

Or contact Community and Public Health on (03) 364 1777.


© Scoop Media

Culture Headlines | Health Headlines | Education Headlines


Arts Festival: An Evening With Richard Dawkins

In a special one-off, New Zealand event at the Michael Fowler Centre, Dawkins will reflect on his eminent career as a scientist, and expand on the themes of inspiration, influence and ideas in his recent memoir, Brief Candle in the Dark: My Life in Science. More>>


Scoop Review Of Books: Worldly And Unworldly

"Being Magdalene" by Fleur Beale The situations shown in this youth novel are shocking, scary, and very moving as we experience Magdalene’s struggle to be a perfect girl as defined by the cruel and unreasonable leader of “The Children of the Faith”, as she moves reluctantly into young womanhood. More>>

Whistle Stop: Netball NZ To Implement New INF Rules

Netball New Zealand (NNZ) will implement the new Official Rules of Netball, as set down by the International Netball Federation (INF), from January 1, 2016. Key changes include the elimination of whistle following a goal, amendments to injury time and changes to setting a penalty. More>>


Scoop Review Of Books: Waiata Aroha

Vaughan Rapatahana on Chappy by Patricia Grace: With this eminently readable novel Patricia Grace returns to the full-length fiction stage after a hiatus of ten years. More>>

'Ithaca' At Q Theatre: Introducing NZ's World Class Cirque Troupe

NZ’s very own cirque troupe is set to become a household name with the premier of its adaptation of Homer’s Odyssey having secured a key season in Auckland. More>>

Music Awards: The Tuis Are Broody This Year

Topping off a sensationally eventful year both at home and internationally, Nelson born brother-sister duo Broods has taken home four Tuis from this year’s 50th annual Vodafone New Zealand Music Awards. More>>


Sport: Richie McCaw Retires From Rugby

Richie McCaw has today confirmed he is hanging up his boots and retiring from professional rugby. The 34-year-old All Blacks captain and most capped All Black of all time has drawn the curtain on his stunning international career which started in Dublin 14 years ago, almost to the day, and ended in London last month when he hoisted the Webb Ellis Cup aloft for the second time. More>>


Get More From Scoop



Search Scoop  
Powered by Vodafone
NZ independent news