Grease Trap Inspection for Boston Restaurants: What the Board of Health Is Actually Looking For

If you operate a restaurant in Boston, Cambridge, Somerville, or anywhere in Suffolk or Middlesex County, your grease trap isn't just a piece of plumbing equipment — it's a regulated device that must perform within specific parameters or you risk a violation, a fine, or a forced closure.

This guide explains exactly what Boston health inspectors evaluate when they look at your grease trap, what the most common violations are, and how to stay permanently ahead of any inspection.

How Boston Regulates Grease Traps in Restaurants

Boston's food establishment regulations require that all restaurants producing grease-laden wastewater maintain a functioning grease interceptor (trap) between their kitchen drains and the municipal sewer system. The Massachusetts Water Resources Authority (MWRA) and the Boston Plumbing Division enforce separate but overlapping requirements:

• MWRA Regulations (314 CMR 12.00): Requires grease interceptors to be maintained so that effluent discharged to the sewer contains less than 100 mg/L of fats, oils, and grease (FOG)
• Boston Plumbing Code (248 CMR 10.00): Requires grease traps to be cleaned and inspected at a frequency sufficient to prevent overflow
• Boston Board of Health: During food establishment inspections, inspectors will observe the grease trap area for overflow evidence, odor, and maintenance documentation

What Inspectors Actually Check

During a Boston Board of Health restaurant inspection, the plumbing component typically involves:

1. Grease Trap Accessibility

Is the grease trap access port clear and accessible? Grease traps buried under equipment or covered with stored items are a citation waiting to happen.

2. Evidence of Overflow

Inspectors look for grease staining around the grease trap access lid, on the floor around the trap, or backing up into floor drains near the trap — all signs of an overfull trap.

3. Maintenance Documentation

Boston inspectors increasingly ask for maintenance records. A written log showing regular inspection and cleaning is your best protection against a violation even if a problem is found — it demonstrates good faith maintenance practice.

4. Drain Flow Performance

Slow or backing-up floor drains adjacent to the grease trap suggest the trap is not functioning properly, even if it hasn't overflowed yet.

5. Odor Evidence

Significant grease trap odor — especially if it reaches the dining room — is a health code concern and can trigger an immediate follow-up requirement.

Common Boston Restaurant Grease Trap Violations

| Violation | Typical Fine | Consequence | |-----------|-------------|-------------| | Grease trap overflow/discharge to sewer | $500 – $5,000 | MWRA notice of violation | | No maintenance records | $250 – $500 | Required maintenance plan | | Accessible trap not cleaned for 90+ days | $300 – $750 | Re-inspection required | | Grease trap blocked or non-functional | Up to $10,000 | Possible permit revocation |

How MKMaintX Weekly Service Covers Your Grease Trap

Every weekly visit under MKMaintX's $69.99/week restaurant drain program includes a visual grease trap inspection. Our licensed plumbing technician:

• Opens the grease trap access port and visually assesses fill level
• Flags any overflow risk with advance notice (typically 2–3 weeks before your trap needs pumping)
• Documents the inspection in your written service report
• Coordinates with your grease trap pumping company when pump-out timing is approaching

This means you're never surprised by an overfull grease trap — and you always have documentation to show a Boston inspector.

Neighborhoods We Serve in Greater Boston

MKMaintX provides weekly restaurant drain and grease trap inspection services across:

• North End — Boston's oldest restaurant district, many with aging cast iron traps
• Back Bay — high-volume dining on Newbury Street and Boylston
• South End — restaurant-dense neighborhood with frequent health inspections
• Seaport / Innovation District — newer builds, high grease production
• Fenway — sports-adjacent volume surge management
• Cambridge — Kendall Square, Harvard Square, Central Square dining corridors
• Somerville — Davis Square, Union Square restaurant clusters
• Brookline, Newton, Quincy — suburban commercial dining

Schedule Your Free Boston Restaurant Drain Assessment

Contact MKMaintX or call 1-800-669-5808. A licensed Massachusetts plumbing technician will assess your grease trap configuration, drain count, and kitchen volume at no cost — and have your restaurant on a weekly maintenance schedule within 3–5 business days.

MKMaintX is a licensed Massachusetts plumbing and facility maintenance contractor with offices in Medford, Boston, and Peabody, MA.