The answer to 'drainage system pests' is that common pests that can infest drainage systems include rodents, insects, and other small animals. Symptoms of a pest infestation may include slow or clogged drains, strange noises coming from the pipes, and visible signs of pests. Solutions can include using pest control methods like traps, baits, or repellents, as well as physically removing debris and obstructions from the drainage system.
It's generally best to call a professional landscaping or pest control company to address drainage system pests, as they have the specialized tools and expertise to properly identify and eliminate the problem. Attempting DIY pest control methods can be risky and may not fully resolve the issue.