Most of us never stop to think if the water we're drinking is safe and clean - we just expect it.
Parents with sick children on Friday did the natural thing and got them a glass of water to keep their fluids up.
At that stage, they did not know the water was the problem.
It is the responsibility of the Hastings District Council to ensure this district has safe drinking water.
On Tuesday, the Havelock North supply was clear. Two days later, a presence was detected.