Underground fire service main installation — what to expect from permits to pressure test

Underground fire service can involve the water utility, civil contractor, sprinkler contractor and fire/building authority. Identify each responsibility before excavation or material orders. Confirm the approved design, service boundary and applicable permits for the address.

Send the civil/site plan, building sprinkler requirements, utility information, available supply data, existing service records and proposed schedule. Locate utilities through the established project process and agree access and excavation responsibilities with qualified personnel.

Materials, burial depth, restraint, connections, flushing and acceptance testing depend on the adopted standards, utility requirements, site conditions and approved plans. A generic table or internet procedure is not a substitute for that design. Agree when the authority and utility need to inspect before covering work.

Washington specifies license and competency requirements for sprinkler and underground work. Check the actual scope and qualifications. Level U is a specialized underground license; it is not the only license category that can have an underground scope.

Keep applicable inspection and test documents, as-built information, utility/authority acceptance and unresolved items together. We review qualified underground sprinkler scopes and coordinate the necessary site and local-authority handoffs. Fees and timing follow the agreed project scope.