Farmers are being asked to keep stock away from stopbanks during heavy rain periods this winter to prevent damage.
Bay of Plenty Regional Council said grazing stock need to be kept away from stopbanks so flood protection is retained for thousands of residents.
Landowners can be held liable for any damage to stopbanks, which help protect millions of dollars' worth of land and property in the Bay of Plenty, it said.
Cattle can graze on stopbanks when the ground is firmer in summer but should be kept to a minimum in the winter months.
Council principal works engineer Tony Dunlop said wetter soil conditions combined with heavy animals could weaken and damage stopbanks.