The first sign of light at the end of the tunnel for Pahiatua's water supply.

Yesterday the bore water tested clear of E.coli.

The town has been on water boil notice since Friday, and it's important to note that notice is still in place.

Tararua Mayor Roly Ellis said it's a good sign, but there's a way to go yet.

"We've had a couple of positive ones, but this was the first negative one. We need two more, so it will be another couple of days before we can in fact give the OK to residents to drink the water without boiling it."

The mayor is cautious about blaming E Coli for the death of livestock in the town.

READ MORE: Resident claims Pahiatua's dodgy water killed calves

This after a woman, who's farm is on the town supply, said she's had four calves suddenly die.

Young calves can be affected by a raft of different things, he said, and urged anyone who's worried about livestock that may have had water from the town supply to call a vet.

"It's very, very dangerous to point the finger at something and say that was E Coli. It could be 101 different things. So, I suggest that lady get hold of a vet, and get them out, and the vet will tell them."

He said he is proud of the way his community is handling the scare.

People have just got on with things, he said.

"I'm just very grateful for the way the community have handled it."