The Water Services Authority says they are expecting further results around arsenic levels in the Waikato River this morning.
An elevated level of arsenic has been detected in the river which supplies drinking water to Hamilton and parts of Auckland.
It says there's no risk to public health and the water is safe to drink.
Authority Head of Operations Steve Taylor told Ryan Bridge that to impact health, people would need to drink at levels above the accepted value for 40 to 50 years.
But he says this is a marginal increase over acceptable value, which they expect to see reduced over coming days.
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