The importance of root removal in a septic tank is to prevent clogs and blockages in the system. Tree roots can infiltrate the septic tank and its pipes, causing damage and obstruction. If left untreated, these roots can grow and expand, leading to costly repairs and potential system failure. Removing the roots helps maintain the proper functioning of the septic tank and prevents any potential backups or sewage leaks. Regular root removal is essential to ensure the longevity and efficiency of the septic system.