The town recently began its twice-a-year water main- and hydrant-flushing program. Each spring and fall, the Water Department flushes the town’s nearly 1,000 hydrants. Flushing occurs Sundays through Thursdays from 7 a.m. to 3 p.m., starting at the Easton line and working west toward Attleboro. Flushing involves the use of high-velocity water to scour the inside surfaces of the water main, removing iron and manganese particles. Official said the flushing may cause a temporary discoloration of water, and residents should employ caution when using filtering systems, washing machines, and dishwashers. The current flushing program began a week ago and is scheduled to end Nov. 1.