This case involves a homeowner who bought a house for a family of seven people and experienced two septic system backups before the close of the escrow and two septic system backups after the close of escrow. The purchase contract for the house included an addendum stating that the septic system in the house had been through numerous repairs due to blockage, which the sellers claimed had been a rat colony infestation of the septic tank that had been cleared out by Pest Control. There was a certified clearance on the septic system but there were still plumbing problems that existed. The previous owner of the house agreed to pay for the costs of getting a licensed plumber if the septic system was found to need a new leach field, and possibly a replacement of its PEX pipe system. The house had several other septic backups and during one of the backups, 500 to 700 gallons of sewage spilled from the downstairs toilet and shower into the hall and bedroom. The homeowners had to leave the property because of this backup. An environmental health specialist went to look at the septic system and determined that the septic system had failed.