Homeowners are responsible for drains that fall within the boundary of your property, including toilets, sinks, and any pipes attached to your baths or showers. If the drainage problem occurs outside of your property, the pipe maintenance falls to the sewage or water company. For business owners in rented or shared premises, the responsibility for the drains and pipes is left to the landlord or property management company, but this will depend on the terms of your lease. If you are the owner of the property, then such problems are your responsibility.