A health warning put in place because of high contamination levels in Ngongotaha Stream will not be lifted until the source of contamination can be identified, a health official says.
But some locals are saying they will not stop using the waterway until people start getting sick or "fish start turning belly up".
Toi Te Ora Public Health Service issued the health warning on Tuesday, stating there were elevated levels of bacterial contamination in the stream, increasing the risk of water users getting sick or contracting infections.
The warning was issued for the section of the stream near the railway bridge.
An A4-size laminated sign has been posted on the end of the bridge.