Comprehensive plumbing inspection template covering water supply, drainage, water heaters, fixtures, and sewer systems. Fill out online and download as PDF — no signup required.
What Is a Plumbing Inspection Report?
A plumbing inspection report is a detailed evaluation of a property's entire water supply, drainage, and waste removal systems. It documents pipe materials, water pressure, water heater condition, fixture operation, drain flow, sewer line status, and any visible leaks or damage. For home inspectors and plumbing professionals, it's the definitive record of what's working, what's wearing out, and what needs immediate attention.
Plumbing inspections happen during real estate transactions, annual maintenance evaluations, insurance assessments, and renovation planning. Unlike many building systems that are visible and accessible, plumbing is largely hidden behind walls, under floors, and underground — making systematic documentation critical. What you can see and test during an inspection often reveals problems that would otherwise stay hidden until they cause damage.
The financial stakes are high. Water damage is the second most common homeowner insurance claim, averaging $12,000 per incident. A failing water heater can flood a basement. Polybutylene supply lines can burst without warning. Cast iron drain pipes corrode from the inside out. A thorough plumbing inspection identifies these risks before they become emergencies, giving property owners the information they need to budget for repairs or negotiate sale prices.
For plumbing professionals, a well-documented inspection report builds credibility, justifies recommendations, and protects against liability. When you document that supply pipes are galvanized steel with visible corrosion, the recommendation to repipe isn't an upsell — it's a documented necessity backed by physical evidence.
What's covered
- Water Supply System: Main shutoff location & function, Pipe material identification, Water pressure measurement, Pressure regulator status
- Water Heater: Type, fuel, age & capacity, TPR valve & expansion tank, Temperature measurement, Overall condition rating
- Drain & Waste: Drain pipe material & condition, Cleanout accessibility, Venting adequacy, Backflow prevention devices
- Fixtures & Sewer: Kitchen & bath fixture condition, Drain flow testing, Sewer line evaluation, Leak & damage documentation
Why this checklist
Organized by system, not by room. Most plumbing checklists go room by room. This template is organized by plumbing system — supply, drainage, water heater, fixtures, sewer — because that's how plumbing actually works. A supply pipe problem affects every fixture downstream, and the report should reflect that relationship.
Pipe material identification is front and center. Galvanized steel, polybutylene, lead, and Orangeburg sewer pipes are all ticking time bombs. This template explicitly identifies pipe materials because material type is often more important than current condition — a "working fine" polybutylene pipe can still fail catastrophically without warning.
Water heater section covers what actually matters. Age, fuel type, and capacity are basic. This template also captures TPR valve status, expansion tank presence, and actual water temperature — the details that separate a code-compliant installation from a potential safety hazard.
Sewer and waste system gets dedicated attention. Sewer problems are the most expensive plumbing repairs. The dedicated sewer section documents sewage type, line condition, backup evidence, and sump/ejector pump status — the findings that can turn a $200 inspection into a $20,000 negotiation item.
How to Complete a Plumbing Inspection Report
- Start with the water supply system — Locate and test the main shutoff valve. Identify the supply pipe material — copper, PEX, CPVC, galvanized steel, or polybutylene. Measure water pressure with a gauge (40-80 PSI is normal). Check for a pressure regulator if pressure is high. Document everything visible from the meter to the fixtures.
- Evaluate the water heater — Record the water heater type, fuel source, manufacturer, age (from the serial number), and capacity. Check the TPR valve for proper installation and discharge pipe. Look for corrosion, leaking, and sediment buildup. Measure hot water temperature at the nearest fixture — 120°F is recommended, above 140°F is a scald risk.
- Inspect the drain and waste system — Identify drain pipe material — PVC, ABS, cast iron, or galvanized. Check accessible cleanouts and main drain flow by running multiple fixtures simultaneously. Verify that drain venting is present and functional (gurgling drains indicate venting problems). Note any backflow prevention devices.
- Test every fixture — Run every faucet, flush every toilet, and drain every fixture. Check for leaks under sinks, around toilet bases, and at shower pans. Test drain flow speed — slow drains indicate partial blockages. Check dishwasher and washing machine connections for proper installation and shut-off valve access.
- Assess the sewer system — Determine if the property connects to municipal sewer or septic. Look for evidence of sewer backup — stains in basement floor drains, sewage odors, or standing water. Check sump pump operation by adding water to the pit. Note any ejector pump systems. Recommend a sewer scope if the main line is older or shows signs of problems.
- Document concerns and recommendations — Note all visible leaks, water damage staining, pipe corrosion, and frozen pipe risks. Prioritize recommendations: safety issues first (gas water heater venting, TPR valve), then functional problems (leaks, slow drains), then maintenance items (water heater flushing, valve exercise). Be specific about what needs attention and why.
Common Mistakes in Plumbing Inspection Reports
Not testing the main shutoff valve. A main shutoff that hasn't been turned in 15 years may not close completely — or may break when operated. Note whether you tested it or not, and if not tested, explain why. In an emergency, a non-functional main shutoff turns a manageable leak into catastrophic water damage.
Failing to identify pipe materials. Saying "pipes appear to be in good condition" without identifying the material is meaningless. Galvanized steel pipes that look fine externally can be 80% blocked internally. Polybutylene pipes that test perfectly today can split tomorrow. Material identification drives the real recommendations.
Skipping the water pressure measurement. High water pressure (over 80 PSI) damages fixtures, appliances, and pipe connections over time. Low pressure (under 40 PSI) affects fixture performance. A $15 pressure gauge provides objective, measurable data that transforms "pressure seems okay" into "pressure measured at 72 PSI — within normal range."
Not running fixtures long enough. Quick on-off testing misses slow leaks that only appear under sustained pressure and drain problems that only manifest with volume. Run faucets for 30-60 seconds minimum. Flush toilets and watch the full cycle. Fill sinks and drain them to test drain capacity under load.
Ignoring the water heater age. A water heater that's "working fine" at 14 years old is past its expected lifespan and increasingly likely to fail — potentially flooding the area around it. Always decode the serial number to determine age, and always note when a unit is past its expected lifespan (8-12 years for tank heaters).
Common questions
How often should plumbing systems be inspected?
For occupied properties, a basic plumbing check should happen annually. A comprehensive professional inspection is recommended every 3-5 years for homes, annually for rental properties, and during every real estate transaction. Properties with older piping materials (galvanized, polybutylene, cast iron) warrant more frequent monitoring.
What pipe materials are considered problematic?
Galvanized steel corrodes internally and restricts flow over decades. Polybutylene (gray or blue plastic, common 1978-1995) is prone to sudden failure. Lead supply lines pose health hazards. Orangeburg sewer pipes (compressed tar paper) collapse over time. If you find any of these, it should be prominently noted in the report with replacement recommendations.
What should water pressure be?
Normal residential water pressure is 40-80 PSI, with 50-60 PSI being ideal. Below 40 PSI causes poor fixture performance. Above 80 PSI accelerates wear on pipes, fittings, appliances, and water heaters. A pressure regulator should be installed if incoming pressure exceeds 80 PSI. Always measure — never guess.
How do I determine a water heater's age?
The serial number contains the manufacture date, but every manufacturer encodes it differently. Common formats: first two digits as year (e.g., "19" = 2019), or letter-coded months (A=January through L=December). Check the manufacturer's website or use a water heater age decoder tool. The rating plate also often shows the manufacture date directly.
Should I recommend a sewer scope?
Yes, for any property with cast iron drain lines, trees near the sewer lateral, a history of backups, or homes older than 30 years. Sewer line replacement costs $5,000-25,000+. A $200-400 sewer scope is the best insurance against hidden problems. It's standard practice in many markets and becoming expected in real estate transactions.
What's the difference between a plumbing inspection and a sewer scope?
A plumbing inspection evaluates all visible and accessible plumbing components — pipes, fixtures, water heater, drains. A sewer scope is a camera inspection of the underground sewer lateral from the house to the city connection. They're complementary: the plumbing inspection covers what you can see, the sewer scope covers what you can't.