Slow drainage is most often caused by an issue with your private side sewer pipe (lateral), such as offset joints, or inside blockages caused by roots or grease. The District has a Lateral Replacement Grant Program that can help you pay for a significant share of the cost for qualifying applications. If neighbors are having similar slow drainage, there may be a problem within the public sewer pipes. For service call the District at 415-259-2949. If neighbors are not having a problem, you may need to call a plumbing company.