Commercial plumbing

Property types and what each one needs

Restaurants and food service. The most demanding plumbing environment there is. Grease interceptors, high-volume kitchen drains, floor sinks and drains, hand wash stations, ice machine and dishwasher connections, and a health inspection standard that is not negotiable. Failures here close you.

Retail and offices. Restrooms are the whole story. Flush valves, sensor faucets, drain blockages, water heaters and the occasional roof drain or break room. Low complexity, high visibility. An out-of-order restroom is what customers remember.

Multi-family. Repeating fixtures at scale, shared stacks where one unit's blockage becomes three units' problem, and the water heater question, central plant or individual units. Water damage between floors is the risk that dominates everything else.

Medical and dental. Backflow prevention taken seriously, specialist fixtures, vacuum and air systems, and a compliance regime with a paper trail.

Warehouse and industrial. Long runs, high-demand fixtures, process water, and eye wash and safety shower stations that have their own testing requirements.

Salons, laundromats and car washes. High water use, hair and lint loads that block drains at a rate domestic systems never see, and hard water that destroys equipment quickly.

Schools and churches. Heavy intermittent use, long idle periods that dry traps and stagnate lines, and work windows measured in specific weeks of the year.

Grease interceptors and kitchen drains

For food service this is the single most consequential system on the property, and the one most likely to produce a closure.

What it does. Slows the flow so fats, oils and grease separate and float, and solids settle, before wastewater reaches the sewer. Municipalities require it and they enforce it.

Service intervals are regulated, not advisory. Most Texas jurisdictions require pumping when the grease and solids layer reaches a quarter of the depth, with documented service records. Failing an inspection because the records are missing is as real as failing on condition.

Keep the manifest. The pumping record is the document an inspector asks for. A tidy folder of manifests has resolved more inspections than any amount of explanation.

Undersized interceptors are common in older kitchens and in spaces converted to food service without the plumbing being reassessed. If yours needs pumping monthly, it is probably too small for the operation rather than being abused.

Line jetting. Kitchen drain lines coat internally no matter how good the interceptor is. Scheduled jetting on a quarterly or semi-annual interval prevents the Friday-night backup that closes the dining room. It is maintenance that pays for itself the first time it prevents a closure.

Floor drains and floor sinks. Required indirect connections for ice machines, dishwashers and prep sinks. They block, they smell when traps dry, and they get flagged at inspection.

What staff put down the drain is the underlying variable. A five-minute briefing and a labelled grease bin do more for kitchen drains than most equipment.

Backflow, compliance and documentation

Commercial properties carry testing and record-keeping obligations that residential ones do not.

Backflow prevention assemblies are required wherever the water supply could be contaminated back through a cross-connection, irrigation, boilers, fire suppression, food service equipment, medical suites.

Annual testing is mandatory in essentially every Texas jurisdiction, by an approved backflow tester, with results filed with the water purveyor. Missing the test can mean a notice and, eventually, disconnection.

Common failures. Debris on a check valve, a failed relief valve, or freeze damage, backflow assemblies sit outside and are among the most freeze-vulnerable items on any Texas property.

Freeze protection for assemblies is worth doing properly. Replacing a large commercial assembly is not a small invoice.

Water heater and boiler compliance. Commercial water heaters have their own requirements for venting, combustion air, relief valve discharge and, in some occupancies, temperature limits and mixing valves.

Accessibility. Restroom fixture heights, clearances, lavatory pipe insulation and control operability are inspected items on any remodel or new fit-out.

Keep the records together. Backflow test reports, grease manifests, permits and inspection sign-offs. Whoever asks for them will ask at short notice.

Working around a business that is trading

This is what separates commercial work from residential work more than any technical difference.

After hours as the default for anything disruptive. Restaurants get overnight or the closed day. Retail gets before opening. Offices get evenings and weekends. Schools get holidays.

Isolate the smallest area possible. Shutting off one restroom or one branch instead of the building is worth planning for, and it depends on isolation valves existing where they should. On properties where they do not, adding them is a good early investment.

Phase the work. Restrooms one at a time so there is always one in service. A multi-family stack floor by floor.

Tell people what is happening. Notices, timing, expected restoration. Half the complaints on commercial work are about surprise rather than inconvenience.

Site conditions. Badging, keys, alarm codes, dock access, insurance certificates and vendor requirements. Sorted before the van arrives, not at the door.

Temporary provision where a shutdown will be long, portable facilities, a temporary water heater, bottled supply for a kitchen.

Emergency response. Twenty-four hour dispatch, because a burst line at 2am in a commercial building is a business continuity event and not just a plumbing one.

Planned maintenance instead of surprises

On commercial property, reactive plumbing is the expensive way to buy the same work with a closure attached.

Scheduled drain jetting for food service and any property with grease or hair loads. Quarterly or semi-annual, planned into the closed hours.

Grease interceptor service on a defined interval with manifests filed.

Annual backflow testing tracked and submitted before the due date rather than after the reminder.

Water heater servicing. Anode and sediment on tanks, descaling on tankless. In hard Texas water, commercial heaters scale faster than residential ones simply because they cycle far more.

Fixture audits. Running flush valves and dripping faucets across twenty restrooms add up to a bill worth noticing, and the repairs are trivial.

Isolation valve exercise. Valves that are never operated seize. Finding that out during an emergency is the worst possible time, and exercising them annually costs almost nothing.

Camera inspection of main lines on older properties, so a failing sewer is discovered on a Tuesday morning rather than during service.

A documented plan. Fixture counts, equipment ages, service history and next due dates. It makes budgeting possible and it is exactly what a property manager needs at renewal.