What's the Maintenance Schedule for a Restaurant's Sewer Line? A Houston Guide

Here is what each interval covers and why it sits where it does.

Daily. Flush every floor drain with hot water at close. Pull and clean the basket strainers in each sink. Have your dish crew wipe greasy pans with a paper towel before anything hits the water. These take minutes and they keep the largest share of grease out of your lines.

Weekly. Pull the trap cups out of your floor drains and clean them properly. Run an enzyme treatment through the drains. Enzymes work on organic buildup between professional visits.

Monthly. Check your interceptor level yourself. Drop a pole to the bottom, pull it out slowly, and read the accumulation. Do this for a few months and you will know your actual fill rate instead of guessing.

Every 90 days. Interceptor evacuation. This is the required interval inside Houston city limits, and the next section covers it in full.

Quarterly to semi-annual. Hydro jetting of your kitchen drain lines. Heavy fry and high-volume kitchens sit at quarterly. Lighter concepts can often run semi-annual.

Annual. Camera inspection of the main sewer line. This is the item most restaurants skip, and it is the one that tells you whether the rest of your schedule is working.

Adjust these to your operation. A wing place and a sandwich shop do not need the same calendar.

This is the part that catches good operators off guard.

Your interceptor captures fats, oils, and grease before they reach the city sewer. Fats float, solids sink, and cleaner water exits the middle. When it works, most of your grease load never leaves the building.

Pumping empties that tank. That is the entire job. The truck arrives, evacuates the interceptor, scrapes it, and leaves you a manifest.

What pumping does not touch:

• The lines running from your sinks and floor drains to the interceptor
• The interceptor's inlet and outlet lines
• The main kitchen line carrying everything to your sewer connection
• Every branch line feeding into it

Grease still reaches those pipes. No interceptor captures everything, and any grease that gets past it goes down the line warm, cools, and sticks to the pipe wall.

That layer builds whether your trap is pumped or not. Month by month the pipe narrows, and one busy service finally overwhelms what is left.

This is why a restaurant with perfect pumping records still backs up. It is also why interceptor overflows happen in systems pumped two weeks earlier. The trap was fine. The line feeding it was not.

Two programs. Two intervals. Two line items in your maintenance budget.

The good news is that both are predictable, and neither one surprises a kitchen that runs them on schedule.

Two things about your interceptor are set by the city, not by you.

Section 47-512 of the Houston Code of Ordinances requires every interceptor inside city limits to be fully evacuated at least every 90 days.

A Notice of Waiver can change that interval. But only if you applied for one and the city approved it. Assuming you qualify is not the same as holding a waiver.

Inspections happen on a routine basis, and you will not always get notice. An inspector can arrive during service and ask to see your records.

That is why manifests matter as much as the pumping. A service that happened without documentation is a service you cannot prove.

There is also a capacity principle worth understanding, separate from the calendar. An interceptor works by giving grease room to float and solids room to sink. Once accumulation reaches roughly a quarter of the tank, that separation stops working. Incoming flow stirs the layers together and grease passes straight through to your line.

So the 90-day interval is a maximum, not a target. If your interceptor reaches that threshold in six weeks, your schedule is too long regardless of what the ordinance allows.

Consequences for falling behind are real. Violations can bring fines, required corrections at your expense, and in serious cases action against your permit. Confirm the specifics for your establishment with the City of Houston.

Jetting is what cleans the lines your interceptor pumping does not touch.

A high-pressure water stream scours the pipe wall and restores the full diameter. Snaking does something different. It punches a hole through the blockage and leaves the grease ring in place, which is why a snaked grease line backs up again in weeks.

Quarterly fits heavy-grease operations. Fryers, wok cooking, BBQ, burgers and wings, high covers, or any location with a backup history.

Semi-annual works for lighter concepts. Sandwich shops, cafés, kitchens with limited fry.

Start at quarterly if you are unsure, then stretch the interval once a camera inspection shows the lines staying clean.

A proper jetting visit covers more than the main line:

• Kitchen sink lines, including prep, dish, and pot wash
• Floor drain lines
• Interceptor inlet and outlet lines
• The main kitchen drain line
• Branch lines connecting individual fixtures

Two things worth knowing before you book.

Sequencing matters. Jetting a heavily loaded line pushes a large slug of grease toward your interceptor. A good contractor schedules a pump-out the same day or shortly after, because that extra load fills the trap faster than normal.

Older buildings need a camera first. Plenty of Houston commercial buildings still have cast iron. A technician should inspect the line and set pressure to suit the pipe material and condition before jetting anything.

Most restaurants skip this one. It is the item that tells you whether everything else on your calendar is working.

Once a year, have a camera run through your main sewer line.

What it shows you:

• How much buildup survived your last jetting
• Root intrusion through cracks or joints
• Separated joints and offsets
• Bellies where the line sags and collects waste
• The actual condition of the pipe, not an estimate

That first item is the one that pays for the visit. If the line is clean six months after jetting, you can stretch your interval. If it is already coating up at three months, you are behind and did not know it.

That is the difference between running a schedule and guessing at one.

The camera also catches structural problems while they are still small. Older Houston commercial buildings often have cast iron mains, and cast iron does not fail all at once. It corrodes, cracks, and separates over years.

One practical note. Ask for the footage and the report in writing. Before-and-after camera documentation from a jetting visit does double duty. It shows you the work was done properly, and it demonstrates a maintained drain program if an inspector asks about it.

Keep those files with your manifests.

Most grease enters your lines one pan at a time. That means your crew has more influence on your drain schedule than your plumber does.

Post this in the dish area:

• Wipe greasy pans with a paper towel before washing. The single highest-leverage habit in the kitchen
• Pour used oil into a sealed container for disposal. Never down a drain, ever
• Keep basket strainers in every sink and clean them every shift
• Flush floor drains with hot water at close
• Clean floor drain trap cups weekly
• Scrape plates into the trash, not the disposal

None of that is complicated. All of it is easy to let slip during a rush, which is exactly when it matters most.

Enzyme treatments have a place here too. They introduce bacteria that work on organic buildup between professional visits, and they help with odors.

Be clear about what they are, though. Enzymes supplement pumping and jetting. They do not replace either one. A kitchen running enzymes instead of a service schedule is still headed for a backup.

Train this with new hires on day one. Habits set in the first week tend to hold.

The restaurants that avoid emergency calls are rarely the ones with the best plumbers. They are the ones whose dish crew wipes the pans.

Five things turn a calendar into a working program.

Match frequency to your concept. Charts are a starting point. A wing place and a coffee shop should not run the same schedule, even at the same square footage.

Track your own fill rate. Check the interceptor monthly for a few months and record what you find. That data sets your real interval better than any general recommendation.

Schedule outside service hours. Pumping and jetting during a lunch rush costs you more than the service does. Most commercial work can be done early morning or after close.

Keep records in one place. Manifests, camera reports, jetting invoices. An inspector asking for documentation is not the moment to start looking for it.

Reassess after changes. New menu, higher volume, a kitchen renovation, or added equipment all change your grease load. The schedule that worked last year may not fit this year.

Watch for signs your interceptor is undersized:

• Grease appearing in the outlet line
• Pumping far more often than typical for your unit size
• Backups that keep happening despite consistent service

If your menu or volume has changed since it was installed, have the sizing re-evaluated.

On a first commercial visit, we walk the kitchen, locate and inspect the interceptor and cleanouts, camera the main line, and build an interval around what we actually find.

Our plumbers are state licensed and background checked. We have worked on Houston commercial kitchens since 2003, and we pull permits and handle inspections when a job needs them.