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.
LISTEN ABOVE

Bruce Weir: Independent urban planner and strategic development expert on the amendments to the fast-track system
03:45

Rachel Mackintosh: E tū National Secretary on ACT's plan to freeze minimum wage, lower youth training rate
02:49

Ryan Bridge: I wouldn't hold your breath for tax cuts
01:46