Bay of Plenty Regional Council is warning people not to swim or play in beach outfalls, stormwater drains or ponds following the region’s long period of hot, dry weather.

The Council's water scientist, Paul Scholes, says because of the weather, many stormwater drains and ponds have little or no flow, leaving the water at risk of bacterial contamination.

He says the water is stagnant and the high temperatures increases bacteria and a build-up of other contaminants which could be a health risk to both people and pets.

Mr Scholes says water at Harrisons Cut outfall onto Papamoa Beach, where families often swim and paddle, is being regularly monitored for health risks.