The answer to 'why is my rodent infestation' is that rodents like mice, rats, or squirrels have likely found a way into your home to nest and find food. Common causes include easy access through cracks or holes, available food sources, and warm, dry shelter. Symptoms include droppings, gnaw marks, nests, and sightings of the rodents themselves.
To solve a rodent infestation, you'll need to identify and seal any entry points, remove food sources, and use traps or other humane control methods. While some DIY solutions may work for small infestations, it's best to call a professional pest control technician for larger problems or recurring issues to ensure the infestation is fully eliminated.