What Does a Commercial Plumbing Inspection Include?

A commercial plumbing inspection covers every system that brings water into your building and every system that takes it out — supply lines, valves, drainage, sewer connections, backflow devices, water heaters, fixtures, and grease traps. Here’s what we actually look at, what we find most often in Woodland, Davis, and Yolo County commercial properties, and what it means for your business.

The Water Coming In

We trace the water supply from the point it enters the building through every distribution pipe, valve, and connection.

Shut-off valves are the first thing we test, and they’re the thing most business owners have never touched. Every commercial building has a main shut-off, zone shut-offs, and individual fixture shut-offs. In theory. In practice, we find shut-offs that have been painted over, buried behind shelving, or seized from corrosion because nobody’s turned them in a decade. A shut-off valve that doesn’t actually shut off is the difference between “turn off the water and wait for the plumber” and “watch your building flood for 45 minutes while we drive over.”

We test every accessible valve. If one doesn’t close, we flag it.

Water pressure gets measured at multiple points. The working range for most commercial systems is 40 to 80 psi. Below 40, fixtures underperform — toilets don’t flush fully, faucets trickle, and the dishwasher doesn’t clean. Above 80, you’re stressing every fitting, hose connection, and valve in the building. High pressure is especially common in parts of Woodland where the municipal supply pushes harder than the building’s plumbing was designed for. A simple pressure-reducing valve solves it, but you have to know the problem exists first.

Pipe condition gets a visual check everywhere we can access — utility rooms, crawl spaces, above drop ceilings, behind access panels. We’re looking for corrosion, green staining on copper, white mineral crust on connections, and any sign of moisture that shouldn’t be there. In Yolo County, our hard water accelerates corrosion and scale buildup inside pipes, so even relatively new buildings can develop problems faster than you’d expect.

The Water Going Out

The drainage side is where most of the expensive surprises hide.

We test every drain in the building — sinks, toilets, urinals, floor drains, specialty fixtures. We’re not just checking whether they drain. We’re watching how they drain. A toilet that flushes slowly, a floor drain with standing water around it, a sink that gurgles after the water goes down — these are all early warnings that something downstream is partially blocked.

Floor drains get special attention in commercial buildings because they’re the ones everyone ignores. A dry floor drain trap means sewer gas is coming into the building. A slow floor drain in a commercial kitchen is a slip-and-fall lawsuit waiting to happen. We check every one.

Sewer camera inspection isn’t part of every routine visit, but we recommend it annually for any building over 20 years old, and more often if we’ve found problems before. The camera shows us the inside of the main drain and sewer line — tree root intrusion, cracks, pipe bellying (where the pipe has sagged and creates a low spot that collects waste), and corrosion in cast iron lines. A lot of older commercial buildings in Woodland still have original cast iron drain lines that are approaching the end of their usable life. A camera tells us exactly how bad it is and how much time you have before it needs replacement.

Vent system — we check that vents are connected, unobstructed, and functioning. A blocked or disconnected vent causes slow drainage, gurgling, and sewer odor inside the building. We’ve found vent caps sealed over during roof work, vent stacks plugged with bird nests, and in one memorable case, a vent pipe that was never connected to anything — it just terminated inside the wall cavity. The building had a sewer smell that three different “solutions” hadn’t fixed because nobody had looked at the venting.

Backflow Prevention

If your building has a backflow prevention assembly — and if you’re a commercial property in Woodland or Davis, you almost certainly do — it requires annual testing and certification. This isn’t optional. It’s a code requirement enforced by the local water authority.

A backflow device stops contaminated water from flowing backward into the public water supply. If the device fails or isn’t tested, you’re in violation. Fines vary, but more importantly, you’re running without the safety mechanism that protects the water supply from whatever’s in your plumbing system — grease, chemicals, bacteria, whatever your business produces.

We test the device, verify it’s the right type for your application (RPZ, DCVA, or PVB — each has specific use cases), check for leaks, and update the certification tag. If it fails the test, we repair or replace it on the spot.

We keep the records so you don’t have to chase paperwork when the water authority asks.

Water Heaters

Commercial water heaters get worked hard. A restaurant’s unit may run almost continuously during service hours. A salon or medical office depends on reliable hot water for every client interaction.

When we inspect a commercial water heater, we’re looking at things the owner usually can’t see or wouldn’t think to check. Sediment at the bottom of the tank is probably the biggest issue we deal with in Yolo County. Our hard water dumps calcium and magnesium into the tank constantly. That mineral sludge settles to the bottom, insulates the water from the burner, and forces the unit to run longer and hotter to do the same job. It drives up your gas bill, shortens the tank’s life, and eventually causes failure.

We drain a sample to check sediment levels. We test the temperature and pressure relief valve — the safety device that prevents the tank from overpressurizing. We check the anode rod, which is the sacrificial metal rod inside the tank that absorbs corrosion so the tank walls don’t. When the anode rod is used up, the tank itself starts corroding from the inside. Replacing an anode rod costs a fraction of what replacing the whole water heater costs.

We also check venting, gas connections, burner condition, and expansion tanks where applicable. A water heater that “works fine” can still be a ticking clock if nobody’s looking at the components that wear out. More on our water heater services.

Fixtures

Every faucet, toilet, urinal, and specialty fixture in the building gets checked. We’re looking for leaks, drips, running toilets, and fixtures that aren’t performing correctly.

Here’s a number that gets business owners’ attention: a single running toilet wastes roughly 200 gallons per day. In a commercial building with six or eight restroom stalls, two or three running toilets can waste over 15,000 gallons a month — hundreds of dollars in water cost before you even factor in the sewer charges. Most of the time, it’s a $5 flapper valve. But nobody checks because the toilet still “works.”

We also check for code compliance on specialty fixtures — ADA-accessible faucets, proper spacing, commercial hand sink requirements for food service, eyewash station functionality. If your business gets inspected by the health department or a fire marshal, these things matter.

Grease Traps (Restaurants and Food Service)

If you serve food, your grease trap is a regulated piece of equipment. We check capacity, flow, buildup levels, and cleaning records.

An undersized or neglected grease trap doesn’t just cause drain backups in your kitchen. It sends fats, oils, and grease into the municipal sewer system, which can draw fines from the local sewer district. We’ve seen restaurants in Woodland get hit with notices because their trap was being cleaned on the wrong schedule — not because anyone was cutting corners, but because the original trap was too small for the actual volume the kitchen was producing.

We’ll tell you whether your trap is sized correctly and whether your cleaning schedule makes sense for your actual output.

What Happens After

When we’re done, you get a report. Not a form with checkboxes — an actual summary of what we found, what needs attention now, what can wait, and what to plan for over the next 12 months. If something needs repair, we give you a price on the spot. If it doesn’t need anything, we tell you that too.

The report is yours to keep for property management records, insurance documentation, and compliance purposes.

How Often

For most commercial properties, once a year is the baseline. Backflow testing is annual (required by code). Grease traps need more frequent attention — quarterly at minimum for busy kitchens. High-traffic restroom fixtures in retail and hospitality benefit from quarterly checks.

If your building is older, if you’ve had problems before, or if you’re taking over a property and don’t know what shape the plumbing is in, call us for an initial assessment and we’ll recommend a schedule based on what we actually find — not a one-size-fits-all template.

We’ve Been Doing This a While

Yolo Plumbing Inc. has handled commercial plumbing for businesses across Woodland, Davis, Winters, and Yolo County since 2011. Restaurants, offices, retail spaces, ag facilities — we know the systems and we know the area. Voted among the best plumbing companies in Yolo County by The Davis Enterprise and The Daily Democrat since 2013.

We do the work before we get there so we can hit the ground running — that saves you money and time.

(530) 293-7192 — Schedule your inspection

Want it to flow…and service from a pro? Call Yolo Joe!