Drain clogs usually develop gradually. Materials collect along the inside of the pipe, narrowing the passage until water can no longer flow freely. During quieter times of the year, a partially restricted drain may only seem slightly slow. When summer activities increase water use, that same drain may begin gurgling, producing odors, or backing up completely.
Kitchen drains are especially vulnerable during cookouts, holidays, and family gatherings. Grease, cooking oils, coffee grounds, starchy foods, and scraps can stick to pipe walls and trap other debris. Bathroom drains may also struggle as more people use showers, sinks, and toilets throughout the day.