These time guidelines apply when a family of four is residing in a house full time. Interior lines should be checked first before looking into the sewage disposal system. When this occurs after a heavy rain, the septic system is especially suspect. Landscaping, foundation drains, and roof gutters should be planned to divert water away from the septic system. Septic systems aren't maintenance free, but, in most cases, they are less expensive for homeowners to maintain than monthly sewer bills would be.
Sewers can back up, too, and require roto-rooter services.
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