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. Foul odors in catchbasins or storm drains could indicate that sewage is entering groundwater, either from the home or a neighboring property's system. 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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