In the UK, septic tank owners are responsible for ensuring their tanks are regularly maintained and emptied to prevent environmental contamination. Under the Environmental Permitting (England and Wales) Regulations, 2010, it is illegal to allow untreated sewage to pollute watercourses, meaning septic tanks must be properly maintained to avoid leaks or overflows. Professional septic tank emptying services must follow strict guidelines for the disposal of waste, ensuring it is treated at an authorised facility. Homeowners are encouraged to keep records of all maintenance and emptying services as proof of compliance.