Following heavy rain, Icon Water is advising anyone downstream of Molonglo River to be aware there may be some effluent in the catchment and to avoid using the water supply for the next 24 hours.

This is a precautionary measure following an incident at the Lower Molonglo sewage treatment plant in Canberra, which caused semi-treated sewage to spill into the Molonglo River.

The amount is likely to be minimal.

The Yass, Murrumbateman, Binalong and Bowning town water supply is not affected.

Any concerns, residents should contact Icon Water on 02 6248 3111.