E-Coli has been found in three water supplies in Dunedin

The City Council is urging caution after the Bacteria was detected in Karitane.

Do not drink' notices have also been put in place in Waikouaiti and Hawksbury Village.

Water group manager Tom Dyer says residents are urged to use water tanks available in their communities.

Dunedin City Council is unsure of the cause at this stage, but further testing will continue over the weekend.