JMJ Plumbing keeps commercial floor drains and floor sinks functioning properly in kitchens, service areas, and other high-use environments. These systems can clog, produce odors, and overflow when neglected or improperly installed. We clear blockages, correct improper connections, replace damaged components, and address drainage and venting issues that cause slow flow and sewer gas odors. The goal is safe, code-compliant drainage that performs reliably under daily use.
Signs You Need Floor Drain and Floor Sink Service
Floor drains and floor sinks are the first place a kitchen or facility problem shows itself, and the first place an inspector looks. Watch for these.
- Standing water that never fully clears — the drain, its trap, or the branch it serves is restricted by grease, food solids, or scale. Standing water on a kitchen floor is a slip hazard and a routine inspection finding.
- Sewer odor near a drain that is not used often — the trap has dried out, or the trap primer that is supposed to keep it filled has failed. An empty trap is an open path from the sewer into the building.
- A floor sink that overflows when the dish machine drains — the drain cannot handle the discharge rate, usually because grease has narrowed the line. It is not the dish machine’s fault and it will get worse each shift.
- Grease visibly building up at the grate or basket — fats and oils are cooling and sticking in the line just past the drain. What you can see at the top is a small fraction of what is coating the pipe downstream.
- Multiple floor drains slow at the same time — the problem is in a shared branch or the building main, not at individual drains. Clearing one will not fix it and the backup will find the lowest opening.
- A broken, missing, or loose grate — besides the trip hazard, an open drain lets debris into the line and is an easy citation during an inspection.
- Rusted, cracked, or sunken drain bodies — the drain assembly or the surrounding floor has deteriorated, which lets water travel under the finished floor instead of into the pipe.
Why Floor Drains and Floor Sinks Matter for Health Inspections
People use the two terms interchangeably, but they do different jobs. A floor drain sits flush with the floor and takes wash-down water and spills. A floor sink is a recessed, usually enamel-lined receptor that receives indirect waste from equipment such as ice machines, dish machines, prep sinks, steam tables, and beverage systems. Those lines discharge into the floor sink through an air gap, so that nothing from the drain can be drawn back into equipment that touches food or ice. That air gap is the whole point of the fixture, and it is one of the first things a health inspector checks.
Two conditions cause most floor sink and floor drain violations: standing water and odor. Standing water means the receptor is not draining at the rate the equipment discharges, which almost always traces to grease or solids in the branch line. Odor means a dry trap. In areas where a drain is used infrequently, a trap primer or a trap seal device is normally required to keep water in the trap, and those primers fail quietly. Requirements for primers, air gaps, and receptor sizing vary by jurisdiction and by which code edition your county has adopted, so we verify against your local requirements rather than assuming.
For a restaurant, this is not a maintenance nicety. A floor sink that backs up during service, a drain with an unsealed trap, or a waste line discharging directly into a receptor without an air gap can all become findings that interrupt operations. Keeping the lines flowing is far cheaper than defending an inspection.
Our Floor Drain and Floor Sink Service Process
- Walk the space and map the drains — we identify every floor drain and floor sink, what discharges into each one, and where the shared branches and cleanouts run. In older buildings this often has never been documented.
- Confirm how each one is actually flowing — we flood-test the receptors, watch the discharge rate against the equipment that feeds them, and check for standing water, odor, and backflow between fixtures.
- Clear the line the right way — cabling pulls a hole through a soft blockage; hydro jetting scours the grease off the pipe wall. For kitchen lines we usually recommend jetting, because a cabled grease line reloads within weeks.
- Check traps, primers, and air gaps — we verify that traps are holding water, that primers are working, and that indirect waste lines maintain a proper air gap over the receptor rather than sitting in it.
- Repair the hardware — broken grates, corroded strainers and baskets, failed primer valves, and deteriorated drain bodies get replaced so the fixture works and passes inspection.
- Set a service interval — we recommend a cleaning frequency based on your menu, your volume, and what came out of the line, and schedule it outside your service hours.
Floor Drain and Floor Sink Service Across North Metro Atlanta
JMJ Plumbing has been keeping commercial kitchens, breweries, grocery departments, schools, and facility wash-down areas draining across North Metro Atlanta since 1996. We serve Acworth, Alpharetta, Canton, Cumming, Dunwoody, Hickory Flat, Holly Springs, Johns Creek, Kennesaw, Marietta, Milton, Roswell, Sandy Springs, Smyrna, and Woodstock, along with the surrounding communities. Kitchen floor drains almost never fail on their own, so this work usually goes hand in hand with hydro jetting to scour the grease out of the branch, a camera inspection when the same line keeps backing up, and grease trap service to keep what belongs in the interceptor out of your drains.
Floor Drain and Floor Sink FAQs
What is the difference between a floor drain and a floor sink?
A floor drain is flush with the floor and collects wash-down water and spills. A floor sink is a recessed receptor that receives indirect waste from equipment such as ice machines, dish machines, and prep sinks through an air gap. The air gap keeps drain water from being drawn back into equipment that touches food, which is why inspectors look closely at floor sinks.
Why does our floor drain smell like sewer?
Almost always a dry trap. Every floor drain has a water seal that blocks sewer gas, and in a drain that is not used often the water evaporates and the seal disappears. Pouring water into the drain confirms it. If the odor returns quickly, the trap primer that is supposed to refill it has failed and needs to be repaired.
What is a trap primer and why does ours not work?
A trap primer is a small device that automatically feeds water to a floor drain trap so the seal cannot evaporate. They fail from mineral scale, a stuck valve, or a supply line that was capped during a remodel. Because the failure is silent, the first symptom is usually odor. Many jurisdictions require primers on infrequently used floor drains.
Why does the floor sink overflow when the dish machine drains?
Because the branch line cannot carry the discharge rate anymore. Dish machines dump a large volume of hot, greasy water in a short burst. As grease cools and coats the pipe wall, the effective diameter shrinks until the receptor cannot keep up. Clearing the line with a cable helps briefly; jetting the pipe wall is what actually restores capacity.
How often should commercial floor drains be cleaned?
It depends entirely on what goes down them. A high-volume kitchen with fryers typically needs its drain lines serviced on a regular recurring schedule, while a restroom or utility area drain may need far less. Rather than guessing, we base the interval on your menu, your volume, and the condition of the line when we first jet it.
Can our kitchen staff clean the floor drains themselves?
They can and should handle the daily part: pulling grates, removing baskets, and cleaning out solids before they reach the line. What staff cannot do is remove the grease film coating the branch pipe, and caustic drain chemicals tend to harden the problem rather than remove it. Regular professional cleaning handles the part in the pipe.
Will a health inspector cite us for standing water at a floor drain?
It is a common finding. Standing water on a kitchen floor is both a slip hazard and evidence that the drainage system is not working as designed, and it frequently appears on inspection reports. Specific scoring varies by county health department. The practical answer is that a drain holding water is telling you the line needs service before the inspector does.
Can you service floor drains without closing our kitchen?
Yes, and most of this work is done outside service hours. Jetting a kitchen line is wet, messy work that needs floor access, so we typically schedule it overnight, before opening, or on a closed day. The kitchen is cleaned up and back in service before your staff arrive for the next shift.
Floor drains backing up or holding water? Book floor drain and floor sink service online, or call JMJ Plumbing at (770) 966-9654. We are a Georgia Master Plumber licensed and insured company (MP210296) serving North Metro Atlanta businesses since 1996, with 24/7 emergency service when a kitchen line backs up mid-service.