Which of the following can cause regular blockages in a drain?

Tree roots are well-known to be a common cause of regular blockages in drains. As trees grow, their roots can invade underground pipes in search of moisture and nutrients. If a drain or sewer line has any cracks or joint separations, the roots can penetrate these openings, leading to obstructions that restrict or completely block the flow of water. This can result in slow drainage, backups, and even damage to the piping system.

This issue is particularly prevalent in older neighborhoods where the infrastructure may have deteriorated over time, making it easier for roots to infiltrate the pipes. Additionally, the nature of certain tree species, such as willows and oaks, makes them more likely to cause such issues due to their aggressive root systems. Regular maintenance and inspections can help mitigate this problem, but once roots have infiltrated the system, removal can be necessary to restore proper drainage functionality.