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The Warkworth Cement Works swimming hole is likely to face another algal bloom and colour change this summer, according to Auckland Council.
Last summer, concerns about the popular swim spot were raised, after the water became a rusty red colour.This prompted tests by Council, which revealed the discolouration to be an algal bloom of no harm to swimmers.
Principal specialist for health enforcement Darryl Thompson says the algal bloom was probably caused by increased nutrient levels from nearby tree felling and high temperatures.
“With the removal of the trees nearby it is likely that nutrient levels will still be high from the associated runoff, so it is more likely than not to return to some degree,” Darryl says.
Water testing also took place over summer to monitor E. coli levels, but tests have since ceased after levels were confirmed to be harmless.
