There are some places in California where the cities records and permits department may show on record that the septic tank on a particular property was converted into a sewage line. However, this information may have come before the city was incorporated. After incorporation, numerous properties have discovered those permits are not accurate. You see, it is a strong possibility that even though the person or company that claimed to have laid the sewage line down on that property never did. They may have laid lines down on some of the property on a particular street and simply skipped over one or two of those homes. Permits possibly were falsified and we will never know without taking additional steps to guarantee exact possibility at a cost. And as for the city records, well, the city can only go by the previous documented paperwork .