The programme's frame: equipment maintained in working order, certification annually, records kept three years — and the operational trigger is the 25% rule, not the calendar. A high-output kitchen hits 25% in weeks; a small café takes months. Our plan visits measure the accumulation and schedule against the rule, so the answer for your kitchen is a number from your tank, not a generic interval.
Restaurants: the FOG programme, in plain English
what does a Nashville restaurant actually owe on its drains? Commercial drain cleaning in Nashville is priced on a written plan at Drain Cleaning Nashville Pros, set from a site visit before work starts. Restaurants also carry a legal duty most never hear about — Metro's FOG programme (Code §15.60) requires interceptor maintenance, annual certification and three years of records, and the 25% rule decides when pumping is due.
Metro Nashville's FOG programme — Fats, Oils and Grease, under Metro Code §15.60 and Policy 2004-01 — exists because one kitchen's grease doesn't stay one kitchen's problem. FOG leaves a commercial kitchen hot and liquid, cools in the line, and plates onto the pipe wall; what escapes the building enters a public main that every business on the street shares. So the programme puts the equipment and the paperwork on the operator:
- Grease control equipment, installed and maintained. A food service establishment must have an interceptor sized and kept in working order — not installed once and forgotten.
- Annual certification. The equipment's condition gets certified on a yearly cycle.
- Three years of records. Pumping and maintenance records are kept for three years and produced when Metro asks.
What we do inside that frame is the drain side: grease lines jetted on a schedule matched to the kitchen's output — hydro jetting is the method, because a cable knocks a hole through grease and leaves the coating — interceptor drain-side maintenance, and the documentation habit that makes certification a filing exercise instead of a scramble. A kitchen that jets on a calendar doesn't buy Friday-night emergencies; that's the whole pitch, and it's priced in writing before the first visit.
The 25% rule: the number that decides when pumping is due
what is the 25% rule? Pump the interceptor when the accumulated grease and solids reach 25% of the liquid depth. Past that point the interceptor stops intercepting — FOG passes through into the sewer with the wastewater, the equipment is effectively absent, and the liability for what reaches the main belongs to the operator, not the building, not the landlord, not the city.
That one rule is why commercial drain work can't run on vibes. Our plan visits check the accumulation against the 25% line between pumpings, log it, and flag the pumping date while it's still a scheduling decision instead of a compliance failure. The log is yours — dated entries, three years deep, ready for the certification file.
Two kinds of interceptor, one honest paragraph
Interiors run on small hydromechanical interceptors (HGI, ASME A112.14.3) — the under-sink grease traps, rated in gallons per minute, matched to the fixtures they serve. Exterior service runs on gravity interceptors (GGI, ASME A112.14.4) — the big in-ground tanks, sized by volume, that serve whole kitchens. The distinction matters because the maintenance differs: an HGI is a frequent, small job; a GGI is a pumped tank on the 25% rule's clock. Commercial drainage specialists Nashville TN searches land on companies that blur the two; we'd rather name the standards and let the equipment on your site decide which paragraph is yours.
The pumping honesty note
Interceptor pumping — physically removing the accumulated grease and solids from a gravity tank — is a licensed hauler's job in Tennessee, with manifesting and disposal rules attached. We don't do it, and we don't imply we do. What we do is everything around it: the jetting, the drain-side maintenance, the 25% checks that tell you when the hauler is due, and the referral to licensed haulers we work alongside. A company that quietly lets you believe its drain crew pumps your interceptor is selling you a compliance gap. This paragraph is on the page so ours never does.
Property managers and multi-unit buildings
Davidson County's housing stock is 40.3% multi-unit, and the drain problem at portfolio scale isn't price — it's proof. The deliverable our commercial work is built around, per unit and per visit: camera footage of the line, a written fault note a tenant and an owner can both read (wipes versus roots versus structure, settled on video), and an invoice that matches the quote. Portfolio scheduling runs on the maintenance plan structure, and the who-pays machinery — URLTA duties, tenant-caused carve-outs, damage terms in writing — lives on the landlords & property managers page, because that's the page your owners will ask you to forward.
STR operators: the between-guest problem
Nashville runs roughly 7,000 permitted short-term rentals, and an STR drain failure has a shape houses don't: it happens with a guest in residence or a check-in at 3 p.m., and the cost isn't the cleaning, it's the refund, the rebooking, and the review. STR work from us is the same priced work — single-fixture and main-line prices off the cost page's one list — with the portfolio discipline applied to calendars: lines camera-checked before peak season rather than during it, and a maintenance schedule for the properties whose lines have a known pattern. The honest sentence: we won't promise a response time we can't keep in writing; what we put in writing is the price and the proof.
A word on the relief question commercial callers bring from Metro's own FAQ — is this a free service? Metro's §15.40.050(B) relief sequence, the one where Metro repairs a failed right-of-way segment, runs differently for commercial customers: residential relief is free; commercial customers are billed. The full sequence is on the who-owns page, and it starts, for everyone, with a plumber's documented attempt — one more reason the camera footage from the first visit is a business asset, not a souvenir.
Commercial drain cleaning Nashville contracts from us carry no list price, deliberately: they're priced from the site visit, in writing before work starts — see the cost page for the residential list and the quoting rules every contract follows. Call (615) 555-0134 to book the site visit. Bring your last pumping record if you have one; if you don't, that tells us where to start.
No — pumping is a licensed hauler's job, and we refer it rather than imply it. We jet the lines, maintain the drain side, run the 25% checks between pumpings, and keep the log your certification file needs. One call to us coordinates it; the hauler's manifest stays the hauler's.
There's no honest shelf price for contract work — a 40-seat café and a hotel kitchen aren't the same plan. Commercial terms are priced from the site visit and written before work starts. The residential version of the plan is published at $149 per scheduled visit on the maintenance page, which gives you the shape of our pricing: per visit, in the open, no discovery invoices.
Yes — that's half the point of camera-first commercial work. The footage shows the cause (wipes and foreign objects read differently on camera than roots or structural failure), the written fault note goes to you in forwardable form, and the who-pays conversation with the tenant rests on evidence instead of assertion. The legal frame is laid out on the landlords page.
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