The answer to 'drainage system pests' is that common drainage system pests include rodents, insects, and debris buildup. Symptoms include slow drainage, foul odors, and visible pests. Solutions may involve clearing debris, using pest control methods, or repairing damaged drainage components.
For minor issues, homeowners can often address drainage system pests through DIY methods like flushing the system, setting traps, or using pest repellents. However, for more extensive problems or recurring issues, it's best to call in a professional landscaping or plumbing expert to properly diagnose and resolve the problem.