Grease Blockage Prevention Sewer Programs: How to Stop Buildup Before the Call Comes In

Grease blockage prevention sewer programs tend to look the same on paper: a jetting schedule, a restaurant inspection list, and a crew on call. They work until a bad week. Then one blockage becomes three, and your crew is back at the same manhole.

Prevention means changing what happens to grease before it hardens. It doesn't mean cleaning faster after it does.

Why Grease Blockages Keep Coming Back to the Same Spots

Grease cools, sticks to pipe walls, and builds in layers. Studies of sewer deposits have found that much of the hardened material is soap-like solids formed from fats reacting inside the pipe. Once it's built up, it isn't a liquid you can flush.

The same places fill up over and over:

• Low-velocity sections and sags

• Bends and joints that catch material

• Segments downstream of clusters of food service

• Lift station wet wells, where grease can form a mat
  

Jetting clears the plug. It doesn't change the conditions that built it. That's why the call comes back.

Step 1: Find Your Hot Spots

You already have the data. Pull your work orders, your jetting records, and your SSO reports. Sort by segment, not by year.

Most utilities already know their repeat-call list. Put it on a map and add what CCTV has shown. Those segments are where prevention pays back first, and they're where you should aim everything below.

Step 2: Cut the Load at the Source

Keep your FOG ordinance, interceptor requirements, and inspections. They reduce what enters the system. They don't remove what's already in it, or what comes from sources an inspection never reaches. How In-Pipe approaches FOG removal in wastewater covers what a program has to handle after the source controls have done their part.

Step 3: Break Down What Gets Past

This is where upstream biological dosing fits. Bacteria dosed near the hot spots produce enzymes that break down fats and oils before they build into deposits. That's a different job than jetting. Jetting moves grease out. Dosing keeps the next layer from forming.

Two honest limits:

• Heavy existing deposits should be cleaned first. Biology works on the ongoing load, not on a pipe that's already half full.

• It takes time to establish. Plan on watching trends over months, not days.
  

If you want the full program picture, In-Pipe's FOG elimination service shows how this runs across a system.

Step 4: Measure Prevention, Not Activity

A busy crew isn't proof of prevention. Track the numbers that show whether buildup is actually slowing down:

• Blockage calls per hot-spot segment

• Jetting frequency on the same segments. If you're jetting a line less often, that's the clearest sign it's working.

• Overflow events tied to FOG

• CCTV deposit condition, before and after
  

Compare quarter over quarter. If the hot-spot list isn't shrinking, adjust the dosing points or the program.

Put Your Hot-Spot List to Work

If the same manholes keep showing up in your work orders, that's a prevention problem, not a crew problem. Talk to In-Pipe about a FOG hot-spot review and map where treatment would cut your repeat calls.

Related reading: FOG Control: What It Is and How It Works