Grease traps are essential for any commercial kitchen or food service establishment, preventing fats, oils, and grease (FOG) from clogging sewer systems. But how long do grease traps last? The answer depends on several factors, including material, maintenance, and usage.
In this guide, we’ll break down:
✔ The average lifespan of different grease trap types
✔ Key factors that shorten or extend their longevity
✔ When to replace a grease trap (vs. repair)
✔ Pro tips from WM Plumbing on maximizing grease trap efficiency
What Is the Life Expectancy of a Grease Trap?
The life expectancy of a grease trap varies based on:
- Material (stainless steel, plastic, or concrete)
- Size and capacity
- Maintenance frequency
- Local regulations
- Volume of FOG entering the system
Average Lifespan by Grease Trap Type
| Type | Lifespan | Best For |
| Stainless Steel | 15–25 years | High-volume kitchens, durability |
| Plastic (Polyethylene) | 10–15 years | Light to medium use, corrosion resistance |
| Concrete | 7–12 years | Outdoor, large-capacity systems |
Note: Poor maintenance can cut these lifespans in half!
5 Key Factors That Affect How Long Grease Traps Last
1. Material & Build Quality
- Stainless steel lasts longest (resists corrosion).
- Plastic is lightweight but cracks under heavy use.
- Concrete degrades from acidic FOG over time.
WM Plumbing Tip: Invest in high-grade stainless steel for busy kitchens.
2. Proper Sizing
- Undersized traps clog faster and wear out sooner.
- Oversized traps retain excess water, causing odors.
Rule of Thumb: Your grease trap should handle at least 2x your peak flow rate.
3. Maintenance Frequency
- Small indoor traps need cleaning every 1–3 weeks.
- Large outdoor traps require pumping every 1–3 months.
- Neglecting cleaning leads to clogs, corrosion, and failure.
4. What Goes Down the Drain
- Hot grease hardens and clogs pipes.
- Food scraps accelerate buildup.
- Harsh chemicals damage seals and bacteria balance.
WM Plumbing Pro Tip: Install sink strainers and train staff on proper disposal.
5. Local Regulations & Inspections
- Some areas mandate grease trap replacements after 10 years.
- Failing inspections can force early upgrades.
When Should You Replace a Grease Trap?
How often should you replace a grease trap? Watch for these signs:
✔ Visible Damage
- Rust/cracks (metal traps)
- Leaks or broken seals
- Foul odors that persist after cleaning
✔ Frequent Clogs & Backups
- If pumping is needed more than monthly, your trap may be failing.
✔ Falling Out of Compliance
- Old traps may not meet updated environmental codes.
✔ Kitchen Expansion
- Increased cooking volume may require a larger system.
WM Plumbing Recommendation: Inspect grease traps annually for early problem detection.
How to Extend the Life of Your Grease Trap
Follow these best practices to maximize your grease trap’s lifespan:
1. Stick to a Cleaning Schedule
- Small traps: Weekly cleaning
- Large traps: Quarterly professional pumping
2. Scrape Plates Before Washing
- Reduce food solids entering the drain.
3. Never Pour Grease Down the Drain
- Collect used oil in sealed containers.
4. Use Enzyme Treatments
- Helps break down FOG between cleanings.
5. Train Staff on Proper Use
- Educate employees on what not to discard in sinks.
6. Schedule Professional Inspections
- WM Plumbing’s experts can spot early wear before costly repairs.
WM Plumbing’s Grease Trap Services
When it’s time for repair or replacement, trust WM Plumbing for:
✅ Grease trap installation (right-sized for your needs)
✅ Routine pumping & maintenance
✅ Emergency clog removal
✅ Compliance inspections
Final Thoughts
How long do grease traps last? With proper care:
- Stainless steel: 15–25 years
- Plastic: 10–15 years
- Concrete: 7–12 years
Key Takeaways:
✔ Clean regularly to prevent buildup
✔ Size correctly for your kitchen’s needs
✔ Replace when damaged or outdated
✔ Work with professionals like WM Plumbing
Need help with your grease trap? Contact WM Plumbing today for expert service and long-lasting solutions!