Plumbing Contractor Documentation Requirements

IPC and UPC Documentation Requirements

Most of the United States uses either the International Plumbing Code (IPC) or the Uniform Plumbing Code (UPC). California, Oregon, Washington, and several other western states use the UPC; most other states use the IPC. Both codes contain explicit documentation requirements that go beyond just getting an inspection signed off.

Key IPC/UPC documentation obligations:

• Permit and approved plans: Approved plans must be on site during all inspections. Many inspectors will reschedule rather than inspect without approved plans — document plan availability in your daily logs.
• Product approval documentation: Materials not listed in the IPC/UPC approved materials tables must have product approval documentation from a recognized third-party testing lab (ICC-ES, NSF, IAPMO). Keep this documentation in the project file.
• Pressure test records: Both IPC and UPC require test records to be retained. The test must be witnessed by the inspector in most jurisdictions — schedule inspections specifically for pressure tests.
• Plumbing riser diagrams: Commercial projects typically require as-built riser diagrams showing stack locations, fixture unit loads, pipe sizes, and cleanout locations. Submit riser diagrams at project closeout.

Pressure Test Documentation

Pressure testing is the plumbing equivalent of the electrical rough-in inspection — you cannot conceal piping until the test is passed and documented. IPC Section 312 and UPC Section 712 define the test requirements.

DWV (drain, waste, vent) pressure test documentation:

• • Air test: 5 psi gauge pressure for 15 minutes with no leakage — document start pressure, end pressure, time, and inspector name
• • Water test: plug all openings, fill to flood level rim of highest fixture — document time held, any leakage, and inspector sign-off
• • Date, time, and inspector ID on all test records

Water supply piping pressure test documentation:

• • Working pressure test at system design pressure (minimum 15 psi) for 15 minutes — or 50 psi air or water test for 15 minutes
• • Document initial pressure, pressure after hold period, pass/fail, inspector sign-off
• • Gas piping: separate pressure test per IFGC Section 406 — 3 psi for 15 minutes for residential, higher for commercial and industrial

Sewer Lateral Documentation

Sewer lateral documentation is among the most consequential plumbing documentation a contractor can produce. Problems with laterals often don't surface for years — and when they do, the contractor who installed the lateral and the contractor who "fixed" it are the first ones called. Complete original documentation is the best protection.

Critical sewer lateral documentation:

• Connection documentation: Pipe size, material, connection method (saddle tap, Y-connection, main replacement), connection depth, and location relative to the building and property line. Photograph the connection before backfill.
• Invert elevation documentation: Record the invert elevation at the building cleanout and at the main connection. Slope must meet minimum code requirements (typically 1/4" per foot for 4" pipe). Use the pipe grade calculator to verify and document slope.
• Cleanout locations: Photograph and document all cleanout locations with dimensions from permanent references (building corners, property pins). Future owners, plumbers, and excavators need to find these.
• CCTV inspection records: Many cities now require a televised inspection of new sewer laterals before connection to the public main. The CCTV video and written report must be submitted to the city before connection approval.
• Trench backfill documentation: Some jurisdictions require compaction testing in the sewer lateral trench zone. Document backfill material type, lift thickness, and compaction test results.

Inspection Sign-Off Documentation

Plumbing inspections typically occur in sequence: underground rough-in, above-slab rough-in, top-out (vent stack), and final. Each inspection sign-off must be retained in the project file — losing the inspection record card is a serious problem if future work requires permit history verification.

• • Underground rough-in: Before pouring slab or backfilling — photograph after inspection approval
• • Above-slab rough-in: After framing, before insulation or drywall — includes pressure test
• • Top-out inspection: Vent stack penetrations through roof — may be combined with rough-in in some jurisdictions
• • Final inspection: All fixtures set, all cleanouts accessible, backflow preventers installed and tagged

Backflow Prevention Documentation

Backflow prevention documentation is ongoing — unlike most other plumbing documentation, backflow records must be maintained and submitted annually for the life of the installation. Water utilities take backflow protection seriously and can revoke water service for non-compliant installations.

• • Device manufacturer, model, and serial number
• • Installation date and location (including orientation — devices must be installed horizontally or in the approved orientation)
• • Hazard level classification (health hazard vs. non-health hazard)
• • Initial field test report by a certified tester — most utilities require test within 30 days of installation
• • Annual test reports submitted to the water utility
• • Repair records with pre- and post-repair test reports

Frequently Asked Questions