What is the 25% Rule for grease interceptors in Macon?

Macon Water Authority regulations mandate that all grease interceptors and traps must be pumped and cleaned when the combined thickness of floating Fats, Oils, and Grease (FOG) and settled food solids exceeds 25% of the total liquid depth of the interceptor.

How often does the Macon Water Authority require grease trap pumping?

The Macon Water Authority requires all commercial food service establishments to pump and clean their grease interceptors at least once per quarter (4 times per year), regardless of whether the 25% limit has been reached.

What is the maximum allowable FOG discharge concentration in Macon?

The wastewater discharged from commercial kitchens in Macon-Bibb County must not exceed a Fats, Oils, and Grease (FOG) concentration of 300 mg/L.

Macon Water Authority Grease Trap Requirements & Code Section 12

For commercial food service establishments (FSEs) in Macon-Bibb County, managing Fats, Oils, and Grease (FOG) is not just a best practice—it is a strict regulatory requirement. The Macon Water Authority (MWA) aggressively monitors grease discharge to prevent sanitary sewer overflows (SSOs) and protect public infrastructure.

This guide outlines the critical operational benchmarks and compliance metrics commercial kitchens must maintain.

📋 The Core Compliance Benchmarks

Every food service business operating within the MWA service area must adhere to three central rules:

1. The 25% Pumping Rule

MWA regulations mandate that all grease interceptors and traps must be fully pumped and cleaned when the combined thickness of the floating Fats, Oils, and Grease (FOG) layer and the settled Food Solids layer exceeds 25% of the total liquid depth of the interceptor.

If your grease interceptor reaches this 25% threshold before your scheduled service, you must pump it immediately to prevent regulatory violations.

2. Mandatory Quarterly Pumping

Regardless of whether your interceptor has reached the 25% capacity limit, the MWA requires all commercial kitchens to pump and clean their interceptors at least once per quarter (4 times per year).

3. FOG Concentration Limit (300 mg/L)

The wastewater discharged from your establishment must not contain FOG concentrations exceeding 300 mg/L. Violations of this limit carry steep penalties, administrative fines, and potential service suspensions.

🛠️ Inspection Protocols & Manifest Tracking

MWA Grease Management Coordinators perform quarterly inspections of all commercial grease traps. During these inspections, they verify:

The depth of the FOG and solids layer using specialized core-samplers (Sludge Judges).
The integrity of the baffle walls and sanitary tees.
Pumping Manifest Logs: You must maintain records of all pumpings on-site for at least 3 years. These manifests must be completed by an approved, licensed hauler and submitted to the MWA.

To ensure your manifests are accepted, make sure to hire a verified local hauler: 👉 Browse Licensed Macon Grease Haulers

⚙️ How Often Do You Need to Pump?

Your specific pumping frequency depends heavily on the volume of meals you serve and the size of your grease trap. While a massive 1,500-gallon outdoor interceptor for a sandwich shop might only need quarterly cleaning, a fast-food fryer system with a small 500-gallon trap might require cleaning every 30 days to avoid violating the 25% rule.

You can calculate your estimated pumping interval instantly using our free tool: 👉 Macon Grease Trap Compliance Calculator

💼 Compliance Silo & External Links

Official Regulations: For the complete legal text, refer to the Macon Water Authority Grease Management Program Guidelines.
Service Registration: Submit your pumping logs and hauler certificates to the Macon Grease Management Coordinator.