Every homeowner should know where there main house trap is located. Your house trap should be checked every two years. If you have tenants or trees on your property it should be checked once per year to avoid major backups. All other drains such as bathtubs, sinks, vanities, toilets yard drains, etc should be cleaned when they start to run slowly or make an unusual sound. A $49.95 Any Sewer or Drain, Inc. offers sewer and drain cleaning contracts to our customers.