Replaced water heater, Prv and installed new water heater shut off. Also we replaced the single wall vent with double wall vent and insulated the water lines to bring everything to code. The homeowner did also have a sewer backup which resulted in water coming out from the base of 2 toilets which was from when the homeowner was running the water to release the air from the system. I recommend they reach out to a septic company to inspect the septic tank/leech field.