Dog Poop as a Resource: How Rerouting Pet Waste Could Generate Over $1 Billion in Energy and Fertilizer
Every year, suburban and urban dog owners in the U.S. produce an estimated 9.9 million tons of dog waste. Virtually all of it ends up in landfills — sealed in plastic bags, untreated, and generating methane as it slowly decomposes in an oxygen-deprived environment. That methane escapes into the atmosphere as a potent greenhouse gas, contributing to climate change while the plastic surrounding it persists for centuries.
But what if that waste stream were rerouted?
Wastewater treatment plants don't just clean water. A growing number convert biological waste into two valuable outputs: biogas — a renewable energy source that can replace fossil natural gas — and biosolids — nutrient-rich material used as agricultural fertilizer. The same infrastructure that handles human sewage is designed to handle dog waste too. The EPA recommends it.
We did the math on what rerouting the addressable U.S. dog waste stream through wastewater treatment would actually be worth.
The finding: If the addressable U.S. dog waste stream were fully rerouted through wastewater treatment, the potential value of the resulting biogas and biosolids fertilizer is estimated at over $1.19 billion annually — from a waste stream that currently produces nothing but landfill volume and greenhouse gas emissions.
A Note on the Numbers: Who We're Counting
The United States has approximately 90 million dogs (APPA 2026; AVMA 2025: 87.3 million). But not all of those dogs are relevant to this analysis.
Roughly 20% of U.S. dog owners live in rural areas where dogs roam freely and waste disperses naturally across open land. Realistically, these owners are unlikely to adopt a collection system — and the environmental calculus is genuinely different on ten acres than on a city sidewalk. That leaves approximately 72 million dogs in suburban and urban environments as the addressable market. Every figure in this analysis is based on that honest number.
How Wastewater Treatment Turns Waste Into Resources
Modern wastewater treatment plants don't simply filter water. They process the biological material in sewage through a series of steps that separate solids from liquids, and then — in facilities equipped for it — convert those solids into useful outputs.
The two primary outputs are:
Biogas — produced through anaerobic digestion, a process in which microorganisms break down organic material in the absence of oxygen, releasing methane-rich gas. This biogas can be used to generate electricity, heat, or — when purified — renewable natural gas (RNG) that can be injected directly into the gas grid. Biogas typically contains 55–75% methane, making it a genuine substitute for fossil natural gas.
Biosolids — the treated solid material that remains after biological processing. When processed to meet EPA standards (Class A or Class B), biosolids are nutrient-rich and widely used as a fertilizer and soil amendment in agriculture. In the United States, 70% of biosolids are land-applied to pasture, rangeland, and agricultural land for crop production — displacing commercial synthetic fertilizers.
Both outputs have real economic value. Both represent resources that are currently being destroyed when dog waste goes to a landfill instead of a treatment plant.
The Current State of Biogas at U.S. Treatment Plants
Not every wastewater treatment plant in the United States uses anaerobic digestion. Of the roughly 14,000 publicly owned treatment plants operating in the country, approximately 10% currently use anaerobic digestion technology. Of those, around 860 actively capture and use the biogas they produce — for electricity generation, heat, or renewable natural gas.
That leaves significant untapped potential. The American Biogas Council estimates that nearly 3,900 additional wastewater treatment plants could support anaerobic digestion, representing a major opportunity for both energy production and resource recovery as the technology continues to expand.
For the purposes of this analysis, we apply the current real-world split: approximately 10% of treatment capacity produces usable biogas, while approximately 90% produces biosolids for land application — reflecting where the industry actually is today, not where it could be.
The Math: Starting with the Waste
Assumptions and methodology
All calculations below use conservative, verifiable inputs. Sources are cited. This analysis represents a theoretical maximum based on full rerouting of the addressable waste stream. In practice, adoption would be gradual. The purpose is to illustrate the scale of the opportunity.
- Addressable dogs: 72 million suburban and urban dogs (APPA 2026, YouGov 2023 — excludes ~18M rural dogs)
- Total addressable waste: ~9.9 million tons/year (~19.8 billion lbs) — based on 72M dogs × ¾ lb/day × 365 days
- Moisture content of dog waste: ~75% — standard for fresh biological waste
- Dry organic solids: 25% of total = ~4.95 billion lbs (2.48 million tons)
- Volatile solids (digestible fraction): ~80% of dry solids = ~3.96 billion lbs
- Treatment split: 10% biogas / 90% biosolids — reflecting current WWTP capacity
- Biogas yield: ~10 cubic feet per lb of volatile solids (conservative mid-range estimate)
- Methane content of biogas: 60% (conservative; typical range 55–75%)
- Biosolids conversion: ~50% of dry solids become usable biosolids
- Natural gas energy value: 1,000 BTU per cubic foot; $3.52/MMBtu (2025 Henry Hub average)
- Biosolids fertilizer value: ~$50/dry ton (conservative land application value)
Calculation 1: Biogas Pathway (10% of Waste)
| Input / Output | Value |
|---|---|
| Volatile solids for biogas (10% of ~3.96B lbs) | ~396 million lbs |
| Biogas produced at 10 cu ft per lb | ~3.96 trillion cu ft |
| Usable methane at 60% of biogas | ~2.38 trillion cu ft |
| Energy content (1,000 BTU/cu ft) | ~2.38 quadrillion BTU |
| Gross value at $3.52 per MMBtu | ~$8.38 billion |
| Conservative estimate (10% capture efficiency applied) | ~$848 million/year |
Applied conservatively — accounting for capture efficiency, processing losses, and variable conversion rates — the biogas pathway from rerouting 10% of addressable dog waste through anaerobic digestion represents an estimated $848 million in annual energy value.
Calculation 2: Biosolids / Fertilizer Pathway (90% of Waste)
| Input / Output | Value |
|---|---|
| Dry solids available (90% of 2.48M tons) | ~2.23 million dry tons |
| Biosolids yield at 50% conversion | ~1.12 million dry tons |
| Direct fertilizer value at $50 per dry ton | ~$56 million/year |
| Fertilizer replacement value (avoided synthetic fertilizer cost) | ~$285–$375 million/year |
The direct biosolids market value — at conservative land application pricing — is approximately $56 million annually. When the fertilizer replacement value is included, the total economic benefit of the biosolids pathway rises to an estimated $285–$375 million in annual value.
Combined Value: What Full Rerouting Would Be Worth
Combined conservative annual estimate: ~$1.19 billion (biogas $848M + direct biosolids value $56M + midpoint fertilizer replacement). These estimates use 2025 benchmark prices, real-world conversion efficiencies, and 72 million addressable dogs. The theoretical upper bound — full biogas capture at higher methane yields from all 90M dogs — exceeds $8 billion annually.
| Adoption level | Dogs | Annual resource value | Bags eliminated |
|---|---|---|---|
| 1% | 720,000 | ~$14.6M/year | ~526 million |
| 5% | 3.6 million | ~$73M/year | ~2.6 billion |
| 10% | 7.2 million | ~$146M/year | ~5.3 billion |
| 25% | 18 million | ~$365M/year | ~13.1 billion |
| 100% (full addressable) | 72 million | ~$1.19B/year | ~21.6 billion |
To put this in perspective: the U.S. dog poop bag market was valued at $46.2 million in 2022 (Fact.MR), and the global market reached $152.7 million the same year. The resources being destroyed by routing dog waste to landfills instead of treatment plants are worth many times the value of the bags used to transport it there.
Beyond the Dollar Value: The Greenhouse Gas Equation
The environmental case goes further than dollars.
Dog waste in landfills decomposes anaerobically — without oxygen — and releases methane directly into the atmosphere as a byproduct. Methane is approximately 80 times more potent than carbon dioxide as a greenhouse gas over a 20-year period. This means that the millions of tons of dog waste currently going to landfills isn't just a missed resource opportunity — it's an active contributor to greenhouse gas emissions.
Rerouting that waste to treatment plants reverses the equation on two fronts:
- Methane that would have escaped into the atmosphere is instead captured, used for energy, and converted to carbon dioxide — a far less potent greenhouse gas — in the process.
- The biogas produced displaces fossil natural gas, avoiding the carbon emissions associated with burning conventional fuel.
The American Biogas Council estimates that fully realizing the U.S. biogas potential from wastewater treatment alone could reduce annual carbon dioxide emissions by 2.3 million metric tons — equivalent to the annual emissions from 430,000 passenger vehicles. Dog waste, properly rerouted, would contribute meaningfully to that figure.
The Missing Link: Getting the Waste There
The numbers above assume that dog waste actually reaches a treatment facility. Today, it almost never does. The barrier isn't infrastructure — municipal wastewater treatment systems are designed to handle biological waste, and the EPA recommends flushing as a safe disposal method. The barrier is practical: there has been no convenient, hygienic way for dog owners to collect waste during a walk and bring it home for toilet disposal.
That's the problem the Poddy addresses. A sealed, reusable collection device that makes the flush pathway the natural and easy choice — not the exception — is the missing link between the waste stream and the treatment infrastructure that can turn it into something valuable.
At scale, this represents something genuinely unprecedented: a consumer product that doesn't just reduce waste, but actively redirects a resource from destruction to recovery. Not a better bag. A better system.
Frequently Asked Questions
Can dog waste really be processed by wastewater treatment plants?
Yes. Dog waste contains similar biological content to human sewage, and municipal wastewater treatment infrastructure is designed to handle it. The EPA recommends flushing dog waste as a safe and environmentally sound disposal method, where local wastewater systems permit. Always confirm with your local water authority, as some older systems or septic installations may have limitations.
Why does this analysis use 72 million dogs instead of 90 million?
The U.S. has approximately 90 million dogs total, but roughly 20% live in rural areas where waste disperses naturally on open land. These owners are unlikely to adopt a collection-and-flush system, and including them would overstate the opportunity. Using 72 million suburban and urban dogs produces a more honest and defensible estimate.
What is biogas and how is it made from waste?
Biogas is produced through anaerobic digestion — a process in which microorganisms break down organic material in the absence of oxygen, releasing a mixture of methane and carbon dioxide. Biogas typically contains 55–75% methane, making it a genuine substitute for fossil natural gas. It can be used to generate electricity, heat, or — when purified into renewable natural gas — injected into the gas grid for broader use.
What are biosolids and are they safe to use as fertilizer?
Biosolids are the treated solid material that remains after biological processing at a wastewater treatment facility. When processed to meet EPA standards — Class A biosolids undergo treatment sufficient to reduce pathogens to undetectable levels — they are nutrient-rich and widely used as a soil amendment and fertilizer replacement in agriculture. In the United States, 70% of biosolids are land-applied for crop production.
How much of the potential is being captured today?
Very little from dog waste specifically — virtually none reaches treatment facilities today. Of the roughly 14,000 U.S. wastewater treatment plants, approximately 10% use anaerobic digestion technology, and about 860 actively capture and use their biogas. The infrastructure exists and is growing. What's missing is the behavioral shift that would route dog waste into that infrastructure rather than to landfills.
Is the $1.19 billion figure realistic?
It represents a theoretical upper bound based on full adoption across 72 million addressable suburban and urban dogs. In practice, adoption would be gradual — and the numbers scale proportionally. At 10% adoption, the annual value is approximately $146 million. At 50%, approximately $595 million. The opportunity is real, measurable, and currently going entirely to waste.
The waste stream nobody was looking at.
The Poddy is a patented, reusable dog waste retrieval system that makes flushing the easy choice on every walk — routing pet waste into the treatment infrastructure designed to turn it into something valuable. No bags. No landfill. No wasted resource.
Sources & Methodology:
- APPA 2026 National Pet Owners Survey — ~90 million dogs in the U.S. — americanpetproducts.org
- AVMA 2025 Pet Ownership and Demographics Sourcebook — 87.3 million dogs — avma.org
- YouGov 2023 Dog Owners Report — rural/suburban/urban dog ownership distribution
- Argonne National Laboratory: Tapping the Potential of Wastewater for a Sustainable Future — 10% of WWTPs use anaerobic digestion
- American Biogas Council: Biogas FAQs — 1,269 WWTPs with digesters; ~860 using biogas
- Environmental and Energy Study Institute (EESI): Fact Sheet — Biogas: Converting Waste to Energy
- Oklahoma State University Extension: Using Biosolids as a Plant Nutrient Source — 70% of biosolids are land-applied
- U.S. Energy Information Administration: Natural Gas Spot Prices 2025 — $3.52/MMBtu Henry Hub average
- U.S. EPA: How Does Anaerobic Digestion Work?
- ScienceDirect: Overview of biogas production at full-scale WWTPs in the United States — less than 10% currently produce biogas for beneficial use
- Fact.MR: Dog Poop Bags Market Report 2022–2032 — U.S. market $46.2M, global market $152.7M (2022)
- Washington State University: Novel Waste Treatment Converts Sewage to Biogas
Note: All dollar estimates are illustrative, based on publicly available benchmark prices and engineering conversion rates. Actual resource recovery values depend on local treatment infrastructure, feedstock quality, and energy market conditions. This analysis is intended to demonstrate order-of-magnitude opportunity, not to constitute a financial projection.