Yes, replacing an underground residential sewer line almost always requires a municipal plumbing permit and mandatory local government inspections. Because sewer replacement involves digging on or near public easements, connecting to city sewer mains, and altering critical sanitary plumbing infrastructure, municipal building codes require permits to ensure the work complies with environmental and structural standards. Unpermitted plumbing work can result in heavy fines and complicate future home sales. Verification: Contact your local municipal building or zoning department before starting any sewer replacement project.
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