Parents at an Australian primary school say the dodgy water supply their students have put up with for years is making them sick.

The P&C at Gidgegannup Primary School, northeast of Perth , says drinking fountains run dry, water is discoloured and the air-conditioning often fails.

WATCH THE VIDEO ABOVE: Bottles replace drinking fountains as water quality investigated at Perth school.

Parents do not know what is causing the issues, but say the saga has dragged on for five years and is affecting the health of their children.

“There was vomiting, there was diarrhoea, stomach aches, just throughout the whole year,” mum Kylea McCarthy told 7NEWS.

“It wasn’t until I took her over to our local GP ... and he said, ‘Yeah, we’ve got a couple of kids coming through from the primary school, and

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