The $25 Billion Problem Hiding in Your Sewer Lines

Most municipal wastewater operators know FOG is a problem. What's harder to fully reckon with is the scale of it.

According to the EPA, blockages — the majority caused by fats, oils, and grease — trigger between 23,000 and 75,000 sanitary sewer overflows every year across the United States. Cities collectively spend around $25 billion annually just removing FOG deposits and managing the downstream effects of those overflows. And that's before accounting for the environmental damage, the public health liability, or the community relations fallout when untreated sewage reaches a neighborhood creek.

If your team is running vacuum trucks on a rotating schedule to keep up with it, you already know: the tab never stops.

Why Grease Traps and Enforcement Aren't Enough

The instinct to manage FOG through grease trap requirements and inspection programs is understandable. In theory, if every food service establishment maintains their interceptor properly, the problem should stay contained before it ever reaches your collection system.

In practice, it doesn't work that way.

Research from North Carolina State University — whose faculty are among the leading experts on FOG worldwide — found that grease interceptor maintenance and management varies significantly across establishments. Most clean their traps every two to three months. Monthly cleaning is considerably more effective at limiting outflows of long-chain fatty acids — but very few operators hit that mark consistently.

And even when the rules are right, enforcement is a separate problem. Most municipalities simply don't have enough staff to keep up with regular inspections. Add budget pressure, political interference at the council level, and the ongoing financial strain that restaurants operate under, and the compliance picture gets considerably messier.

The honest conclusion: waiting for upstream compliance to solve your downstream FOG problem is not a strategy. It's a gamble.

What FOG Is Actually Doing Inside Your Pipes

Here's the chemistry that makes FOG so tenacious — and why conventional cleaning only buys temporary relief.

When fats and oils enter the collection system, they don't stay liquid. Through a process called hydrolysis, they break down into free fatty acids and glycerols. Those free fatty acids then react with calcium in the sewer pipe through a process called saponification — the same basic chemistry that makes soap. The result is a hardened, calcium-based deposit that adheres to pipe walls and doesn't wash away on its own.

This is why a hydro-jet gets your pipes flowing again today and you're back in the same spot in six months. You've removed the blockage, but the conditions that created it — the biological and chemical environment inside your collection system — are exactly the same as before.

The Compounding Problem: Fatbergs Left unmanaged, those hardened deposits grow. "Flushable" wipes — a rapidly expanding problem in municipal systems — latch onto FOG accumulations and accelerate the process dramatically. The resulting masses, commonly called fatbergs, aren't just a nuisance. They're expensive, time-consuming, and damaging to remove.

One Michigan fatberg — 100 feet long and 19 tons — cost $100,000 to extract. A Maryland utility reported more than 10,000 gallons of untreated sewage leaked into a local creek due to a fatberg-related blockage. These aren't hypotheticals. They're the logical endpoint of reactive FOG management.

A Different Approach: Treating the Biology, Not Just the Blockage

In-Pipe Technology's approach starts with a different premise: the sewer collection system itself is a large biological reactor. It already contains enormous populations of microorganisms. The question isn't whether biology is active in your system — it is. The question is whether the biology is working for you or against you.

When anaerobic conditions dominate and FOG accumulates, the wrong bacteria win. Sulfate-reducing biofilms proliferate. Hydrogen sulfide production climbs. Infrastructure corrodes. Treatment plant influent quality degrades.

In-Pipe introduces proprietary blends of aerobic, vegetative bacteria — specifically selected for hydrocarbon digestion — directly into the collection system at strategic dosing locations near FOG point sources. These bacteria use a broad panel of enzymes to break down the ester and lipid bonds in fats, oils, and grease before they can solidify and accumulate. The dosing panels are installed inside manholes and pump stations, require no external power, no above-ground storage, and are reloaded every 30 to 60 days by In-Pipe's service team — all without entering confined spaces.

The goal isn't to clean your pipes. It's to change the microbial environment so the problem stops regenerating.

What That Looks Like in Practice

Crown Point, Indiana faced a common inflection point: treatment capacity constraints that pointed toward expensive capital expansion. In 2007, they chose In-Pipe Technology instead.

The results over the following three years: sludge production per pound of influent dropped 36% by TSS measurement and 41% by BOD. Total hauled sludge fell 27%, saving the city nearly $19,000 annually and eliminating the need for facility expansion. The plant produced 3,120 fewer tons of biosolids over that period. Aeration energy dropped 50%. FeCl consumption — a chemical cost — dropped 50% as well.

That's not a different maintenance schedule. That's a fundamentally different system performance.

Is Your FOG Program Managing the Problem or Solving It?

If the same lines keep showing up on your jetting rotation, it's worth asking that question directly.

In-Pipe Technology works with municipal operators and utilities to evaluate FOG programs and identify where bioaugmentation can reduce operational costs, decrease maintenance cycles, and improve system-wide performance — without capital expansion and without chemicals. Learn more at in-pipe.com