Compost Manufacturing (United States) — NAICS 325315

1. Overview

Compost manufacturing is the business of turning organic waste — yard trimmings, food scraps, manure, wood, and treated sewage sludge (biosolids) — into a finished soil product through controlled aerobic (oxygen-fed) biological decomposition [1]. The economics sit at an unusual intersection: a composter often gets paid twice — once on the way in, as a "tipping fee" for accepting waste, and again on the way out, as product revenue when it sells the finished compost [2]. That dual revenue model, plus a wave of state laws forcing organic waste out of landfills, is what makes the industry interesting to investors right now.

Why an investor cares: the tailwind is unusually policy-driven. A dozen states now legally require food and yard waste to be diverted from landfills, and California goes further — it mandates that public agencies buy compost, effectively creating guaranteed demand [3][4]. At the same time, landfill costs keep rising, widening the gap that pushes waste toward composters [2]. The counterweight is a serious regulatory overhang on the biosolids feedstock stream (PFAS "forever chemicals"), thin margins, and a product that is heavy and cheap and therefore expensive to ship [5][6].

Public vs. private ways in: there is no U.S.-listed pure-play compost manufacturer. Public-market investors get exposure indirectly, through large diversified waste and environmental-services companies where organics is a small but growing segment [7]. The concentrated, fast-consolidating "pure" compost and organic-residuals business is largely private — owned by private-equity and infrastructure funds (TPG-backed Denali, Goldman Sachs-owned Synagro, Generate Capital-backed Atlas Organics), regional operators, and municipalities [8][9][10]. This is a sector where the most direct plays are private.

2. What it is and how it's structured

Scope. NAICS (North American Industry Classification System) code 325315 covers establishments primarily engaged in manufacturing compost through the controlled aerobic biological decomposition and curing of biodegradable materials [1]. It was carved out as its own six-digit code only in the 2022 NAICS revision (effective March 2022); before that, compost was buried inside broader fertilizer categories (NAICS 325314), so clean federal data on the industry is genuinely new and pre-2022 statistics are not a continuous historical series [11][12]. The code excludes nitrogenous fertilizer made from sewage or animal waste, phosphatic fertilizer, and businesses that merely mix fertilizer ingredients made elsewhere — those activities fall under NAICS 325311, 325312, and 325314, respectively [12].

What it excludes (adjacent codes). The classification line matters because most U.S. composting activity is captured elsewhere:

• Waste collection and treatment/disposal — including many landfill-adjacent composting operations run by solid-waste firms — falls under NAICS 562 (Waste Management and Remediation Services), not manufacturing.
• Fertilizer (mixing only) manufacturing is NAICS 325314; nitrogenous and phosphatic fertilizer manufacturing are 325311/325312 [13].
• Municipal and government-run composting sites are counted as government activity, not as manufacturers.
• Farms and nurseries composting on-site for their own use are classified in agriculture.

Operations. Commercial operators accept yard and tree trimmings, food scraps, crop residues, manure and, at some facilities, biosolids or anaerobic-digestion residue. They inspect and preprocess the material, remove packaging and physical contaminants, grind woody material, and blend carbon-rich and nitrogen-rich feedstocks. The biological stage requires management of moisture, oxygen, particle size and temperature. Active decomposition is followed by curing, screening, testing and, in some cases, blending with soil, sand or other components before bulk or bagged sale [14][15]. Production systems range from open windrows turned by mobile equipment to aerated static piles and enclosed in-vessel systems. A 2024 EREF/U.S. Composting Council survey (301 facility respondents) found windrows used by 42% of respondents, while 22% used multiple methods; yard waste was accepted by just under 80% and food waste by 51% [16].

Ownership mix. The population of operators is a barbell. At one end sit thousands of small, often single-site operators and municipal yard-waste facilities. At the other, a handful of PE- and infrastructure-backed national platforms (Denali, Synagro, Atlas Organics) and the organics divisions of the big public waste companies. Roughly one in five full-scale food-waste composting facilities is municipally owned, though many of those are operated under contract by private firms [17].

3. How big it is

Our federal figures (2022 Economic Census, NAICS 325315). These are the authoritative U.S. numbers, and they describe only establishments whose primary business is compost manufacturing:

• 88 firms [18].
• ~$756 million in total receipts ($755,865 thousand) [18].
• Highly unconcentrated at the top by manufacturing standards: the four largest firms accounted for 41.9% of revenue (CR4), the top eight 54.7% (CR8), the top 20 75.9%, and the top 50 95.1% [18]. The Herfindahl-Hirschman Index (HHI, a standard concentration measure where below 1,500 is "unconcentrated") was just 642.8 [18].
• Small Business Administration (SBA) size standard: a firm is "small" at or below 550 employees [19] — a high threshold that tells you the government expects most operators to be modest in size.

We do not have federal employment, establishment count, or payroll figures for 325315 in our ground-truth source, so this primer does not state them.

The undercount caveat — this is important here. The $756 million / 88-firm federal picture dramatically understates real U.S. composting activity, for structural classification reasons. Independent industry surveys tell a much bigger story: there are close to 5,000 composting facilities operating in the U.S. (most accepting only yard trimmings) [20]. The U.S. Composting Council's 2023 throughput survey — covering just 263 facilities in 40 states — found those facilities alone processed 14.4 million tons of organic feedstock and produced 6.0 million tons of finished compost, up from 5.2 million tons in 2021 [21]. The gap exists because the bulk of composting is done by municipalities and by waste-management companies whose primary code is NAICS 562, neither of which rolls up into the 325315 manufacturing census. Third-party market researchers, using a broader "compost product" definition, size the U.S. compost market in the multiple billions of dollars, with the U.S. representing roughly a fifth of a global market estimated near $6 billion in 2024 [22] — again, far above the narrow manufacturing-census receipts. (Note: a frequently repeated claim that the U.S. compost market has $5.6 billion in annual sales appears in an old microcap SEC filing citing the U.S. Composting Council, but the underlying study and methodology predate NAICS 325315 and should not be represented as current market size [23].) Treat the $756 million as "compost's dedicated manufacturing core," not the whole activity.

The feedstock opportunity. EPA estimates that U.S. retail, food-service, and residential sources generated 66.2 million tons of wasted food in 2019, of which just 3.3 million tons (5.0%) was composted [24]. Food accounts for 24.1% of landfilled municipal solid waste; adding yard trimmings, wood, and paper raises the organic share to 51.4% [14]. The gap between what is generated and what is composted is the structural opportunity — and the policy mandates are designed to close it.

4. The investable universe

There is no publicly traded pure-play. The table below shows the two realistic routes: (a) diversified public waste companies that run compost/organics as one line of a much larger business, and (b) the major private/PE-backed operators for whom organics is the business.

Public companies (indirect exposure; compost is a minor slice of each)

Compost and organics are not separately broken out as material revenue lines in these companies' financials — so buying the stock is a bet on solid waste broadly, with organics as optionality, not a targeted compost investment. (Scotts Miracle-Gro provides downstream exposure to branded growing media and lawn-and-garden demand, but its filings do not establish a separately reportable compost-manufacturing business; it should not be valued as a 325315 pure play [32].)

Major private / other owners (where the pure compost economics actually live)

• Denali (Denali Water Solutions / WeCare) — TPG-backed since 2020; describes itself as the nation's largest manufacturer of organic soil amendments; brands include WeCare (Northeast), New Earth (South/Texas), and Swanson Bark (Pacific Northwest); has made 13+ acquisitions; estimated ~$0.9 billion company-wide revenue [8][33].
• Synagro Technologies — the largest biosolids recycler in North America (800+ municipal/industrial customers across 35 states); owned by Goldman Sachs' West Street Infrastructure Partners III since 2020 and reportedly being marketed for sale [9][34].
• Generate Upcycle / Atlas Organics — backed by infrastructure investor Generate Capital; portfolio comprises eight compost locations with approximately 800,000 tons of annual capacity for green waste, food waste, and biosolids [10].
• Recology — 100% employee-owned; reported eight composting facilities in California and Oregon and more than 684,000 tons directed to composting at its facilities in 2022 [35][36].
• Cedar Grove — two Washington facilities processing more than 350,000 tons of food and yard waste annually [37].
• A1 Organics — leading regional composter (Colorado/Rocky Mountain region).
• Municipalities — cities and counties own a meaningful share of facilities, often operated under private contract [17].

These capacity disclosures are not an authoritative national ranking: reporting years, feedstock definitions, and inclusion of third-party processing differ. The Census does not identify the four leading firms by name.

5. How the money works

Compost operators make money on a two-sided model, and understanding the balance between the two sides is the whole game [2]:

1. Inbound — tipping fees. Waste generators (haulers, cities, food processors) pay the composter to accept material. The composter can charge a tipping fee below the local landfill's "gate rate" — typically pricing organics processing at ~80–90% of the municipal-solid-waste tip fee — and still win the volume, because it also earns on the finished product [2]. Where landfill tipping fees are high (e.g. the Northeast), inbound revenue can carry the business; where they are low (e.g. parts of the Midwest), the operator must lean on product sales [2]. The 2024 EREF/USCC survey found that at larger facilities, tipping fees supplied more than 80% of revenue on average; fees rarely exceeded $75 per ton except in private household food-waste collection [16]. Micro facilities, by contrast, received an average of only 25% of revenue from tipping fees [16].

2. Outbound — product sales. Finished compost sells in bulk for roughly $20–$50 per cubic yard wholesale, with a per-ton market value around $40–$100 depending on quality and region [2]. Buyers are landscapers, nurseries and topsoil blenders (commercial horticulture, the single largest end market at ~2.6 million tons in 2023) and farmers (~2.3 million tons) [21]. The survey found landscaping the most common channel (68% of respondents) and agriculture receiving approximately one-third of volume [16].

The practical implication is that many compost manufacturers are economically waste processors first and fertilizer sellers second. Long-term feedstock contracts can be more valuable than a strong retail brand. Well-structured contracts include guaranteed tonnage or put-or-pay terms, inflation escalators, feedstock specifications, and contamination surcharges — they reduce exposure to volatile finished-product demand and support project financing [38].

The structural story of the last decade has been a shift from tipping-fee dependence toward product revenue [2]. What makes or breaks a facility:

• The landfill-cost spread. The average cost of landfilling food waste topped $60/ton in 2024; every dollar landfill disposal rises makes composting more competitive on the inbound side [2].
• Product quality and contamination. Plastics and glass in incoming feedstock lower the value (and salability) of the finished compost; clean feedstock commands premium pricing. Contamination is the most important variable cost and capacity risk — at a 50,000-ton-per-year facility, one industry expert estimated that preprocessing a contaminated stream can cost 2.5 times as much per ton and require approximately twice the capital of processing clean feedstock [38].
• Freight radius. Compost is heavy and low-value per ton, so transport costs cap the economic shipping distance — this is a fundamentally local product, which is why the industry is fragmented and why operators cluster near both feedstock and end markets. The 2024 survey found 60% of respondents obtained feedstock from no more than 25 miles away [16].
• Throughput and cycle time. Faster, more controlled methods (aerated static pile, in-vessel) raise capacity and reduce odor complaints but require more capital than simple windrow turning.
• Capacity utilization and input mix. Like other manufacturers, margins hinge on running the site near capacity and on a favorable, steady feedstock supply.
• Scale. Large survey respondents averaged 2.9 employees per 10,000 tons of capacity, compared with 12.4 employees at smaller facilities — a significant labor-efficiency gap [16].

Exact industry operating, EBITDA, and net margins could not be established — the public waste companies do not report composting as a separate segment, and the Census does not provide operating profit.

6. What drives demand

• State organics-diversion mandates (the dominant driver). Twelve states now have food-waste diversion mandates — Vermont, Massachusetts, Rhode Island, New York, Maryland, Washington, New Hampshire, Connecticut, Illinois, Maine, New Jersey, and California [4]. These laws force organic material toward composters (inbound volume) and, in California's case, force demand for the finished product. Massachusetts lowered its commercial-food disposal-ban threshold from one ton per week to one-half ton per week effective November 1, 2022 [39].
• California SB 1383 specifically. The law targets a 75% cut in organic waste sent to landfills and requires jurisdictions to procure compost and other recovered organics — a rare policy that guarantees an end market. The procurement requirement began January 1, 2022, creating an end market as well as a diversion obligation [40][41]. California is estimated to still need 50–100 new composting facilities to meet its goals, and 2024 legislation added assistance for composters [3]. New York City launched mandatory citywide residential composting in April 2025 [4].
• The widening landfill-cost gap. Rising disposal fees make diversion cheaper by comparison [2].
• Agriculture and soil health. Compost improves water retention, soil organic carbon, aggregation and yields, and is increasingly tied to carbon-sequestration and regenerative-agriculture programs [42]. Organic farming is a favorable niche: USDA reports that certified organic cropland reached 3.6 million acres in 2021, up 79% from 2011, while certified operations exceeded 17,000 farms [43]. However, compost is not a one-for-one substitute for synthetic fertilizer — its nutrient-to-mass ratio is low and variable; USDA reports that only about 4% of manure-fertilized farmland received composted manure during 2015–2018 [44].
• Landscaping, horticulture, and construction. The largest current end market; demand tracks housing, landscaping and construction activity.
• Green infrastructure. Stormwater management, erosion control, and contaminated-site remediation are growing specification-driven uses, including in state transportation and public-works projects [42].

7. Regulation

Compost manufacturing is regulated at multiple levels, and regulation is simultaneously the industry's biggest tailwind (diversion mandates) and its biggest threat (biosolids/PFAS).

• Feedstock diversion mandates. State organics bans and California's SB 1383 procurement rules are, in effect, demand regulation (Sections 4 and 6) [3][4].
• Biosolids land application (EPA 40 CFR Part 503). Treated sewage sludge is a major feedstock (~1.5 million tons in the 2023 survey) [21]. The EPA regulates its land application, and this is where the risk sits.
• PFAS — the wildcard. In January 2025 the EPA released a draft risk assessment for PFOA and PFOS in sewage sludge/biosolids; the comment period drew more than 25,000 submissions and closed in August 2025, followed by additional draft guidance in mid-2026 [45]. EPA found potential human-health risk in some modeled scenarios involving PFOA- or PFOS-containing biosolids — that does not establish that all biosolids or biosolids compost is unsafe, but it makes supplier diligence, testing, contract indemnities, and end-market selection critical [46]. States are moving faster than the federal government: at least 10 states have introduced or passed PFAS-in-biosolids legislation, and at least 6 (Arizona, Massachusetts, New Hampshire, New York, Oklahoma, South Carolina) have proposed outright bans on land-applying biosolids [45]. Maine has already effectively banned it. New York's environmental regulator issued a December 2025 draft policy that would require PFAS sampling of biosolids-derived compost [45]. This patchwork could strand the biosolids feedstock stream and raise disposal costs for the sludge-based segment.
• Facility permitting. Composting sites are permitted under state solid-waste rules, with odor, runoff, and siting requirements that vary widely by state. The predominance of state-by-state regulation reduces standardization and raises development time [47].
• Product quality and pathogen control. Voluntary programs — notably the U.S. Composting Council's Seal of Testing Assurance (STA) — certify finished-product quality and are increasingly referenced in procurement specs. Pathogen control and product consistency matter particularly in food agriculture; USDA organic guidance requires allowed feedstocks and documented process control — one recognized method heats the complete pile to at least 131°F for at least three days [48]. A failure can eliminate the organic-agriculture market or trigger recall and liability.

8. Competitive dynamics and consolidation

The federal concentration data (CR4 of 41.9%, HHI of 642.8) paints the manufacturing core as fragmented [18] — and the broader ~5,000-facility population is more fragmented still [20]. But that snapshot understates an active roll-up. Neither national measure captures the economically relevant haul radius around an individual city or permitted facility — local barriers (zoning, odor setbacks, stormwater controls, collection contracts, hauling distance) can confer considerable market power even when national concentration is low.

• Private-equity and infrastructure capital are consolidating the top. TPG's Denali has grown by 13+ acquisitions into the largest national organic-residuals platform; Goldman Sachs owns Synagro, the largest biosolids recycler; Generate Capital backs Atlas Organics [8][9][10]. In August 2024, Synagro and Denali closed a mutual asset-transfer that rationalized their footprints — a sign the two largest players are actively reshaping the map [8].
• Synagro is reportedly in a sale process, which could hand the largest biosolids platform to a new infrastructure owner [34].
• The public waste majors are building organics capacity. Republic Services runs 25 organics facilities (including 13 compost sites) and is opening one of the country's largest, most advanced compost parks in San Bernardino; it processed more than 1.1 million tons of yard and food waste in 2025 [7]. WM operated 49 organics-recycling facilities at year-end 2025 [27]. Casella is likewise investing [31].
• Why it stays local. Because compost can't travel far economically, national scale comes from assembling regional operators rather than from a single mega-plant. Expect continued fragmentation at the bottom and continued roll-up at the top.

9. Risks

• PFAS / biosolids regulation — the single largest sector-specific risk; tightening rules could strand the sludge feedstock stream, raise disposal costs, and create legal liability [45][46].
• Feedstock contamination — plastics, glass, and confusion over "compostable" packaging degrade product quality and value; preprocessing contaminated streams is expensive and capital-intensive [38].
• Commodity and cyclical exposure — finished-compost prices track landscaping, construction and agricultural demand; it's a low-value bulk commodity [2]. Yard-waste volumes are seasonal and weather-sensitive; compost sales depend on spring planting, landscaping, construction, municipal projects and farm economics.
• Freight-bound, local margins — heavy, cheap product means small shipping radii and limited pricing power outside the local market.
• Siting and nuisance — odor complaints and community opposition (NIMBY) make new facilities hard to permit, even where policy demands more capacity [3]. Odor, dust, runoff, fires, and truck traffic create community-acceptance risk; a technically permitted facility can still lose its social license or face operating restrictions if poorly sited or managed.
• Policy dependence — much of the demand story rests on mandates; rollbacks, weak enforcement, or loosened procurement rules would soften it (California already amended SB 1383 requirements in 2024) [3].
• Thin margins and capital intensity — advanced, low-odor systems require meaningful capital, and returns depend on high throughput and clean feedstock. Site work (engineering, permitting, environmental studies, pad construction, drainage, leachate management) can account for a substantial portion of project cost [38][49].
• Substitutes — landfill disposal, incineration, animal feed, rendering, direct land application, and anaerobic digestion compete for feedstock; synthetic fertilizer, raw or pelletized manure, peat, coir, bark, topsoil, and other soil amendments compete for product demand; source reduction is environmentally preferable but reduces available feedstock.
• Labor availability — labor and physical contamination were among the most important operating concerns reported in the national survey [50].

10. How to invest and the outlook

Public-market routes. There is no pure-play stock. Investors wanting listed exposure buy the diversified waste companies — WM, Republic Services (RSG), Waste Connections (WCN), GFL Environmental (GFL), or Casella (CWST) — and accept that compost is a small, growing slice of a solid-waste business [7][25][30]. This is exposure to the theme (organics diversion, landfill economics), not to compost specifically. Tickers, share prices, and valuation multiples for these names reflect the whole waste enterprise, not the compost line.

Private routes (the more direct plays). The concentrated compost economics sit in private hands:

• PE- and infrastructure-fund platforms — TPG's Denali, Goldman's Synagro (the latter reportedly for sale), Generate Capital's Atlas Organics — are the largest pure exposures, accessible via fund co-investment or secondary opportunities [8][34][10].
• Regional operator roll-ups and direct facility ownership/development, often near feedstock and end markets.
• Project- and infrastructure-level financing, and public-private partnerships (P3s) with municipalities that need diversion capacity — California alone is estimated to need 50–100 new facilities [3]. P3 structures may involve publicly owned but privately operated facilities, privately financed facilities under municipal contracts, or full collection-and-processing concessions [51].

The most defensible private asset combines long-duration site control, difficult-to-replicate permits, dense collection routes, contracted inbound tons, enforceable contamination specifications, sufficient curing and storage space, and several credible product outlets. A facility relying mainly on spot food waste, short-term municipal policy, and optimistic compost-sale assumptions is substantially riskier.

Near-term drivers to watch (forward-looking). The demand backdrop looks structurally supportive: more states adding diversion mandates, California and New York City ramping procurement and residential collection, and a widening landfill-cost gap [2][3][4]. The swing factor is PFAS regulation of biosolids — the outcome of the EPA's risk assessment and the state patchwork will determine whether a large feedstock stream expands or contracts [45]. Expect continued consolidation at the top (a Synagro sale would be the next marker) and continued fragmentation of the long tail. Net judgment: a small, unglamorous, policy-levered manufacturing niche with a genuine secular tailwind and a genuine regulatory tail-risk — most cleanly accessed today through private capital rather than public equities.

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Sources

1. NAICS Association / U.S. Census Bureau, "NAICS Code 325315 — Compost Manufacturing" (2022). https://www.naics.com/naics-code-description/?v=2022&code=325315
2. HomeGuide, "2026 Compost Costs: Bulk Prices by Cubic Yard, Ton & Type" (2026); Green Mountain Technologies, "Landfill Costs Are Tipping the Scale Toward Composting"; Waste360, "Growing Compost Profits." https://homeguide.com/costs/compost-cost; https://compostingtechnology.com/landfill-costs-are-tipping-the-scale-toward-composting/
3. Waste Dive, "California's organics diversion mandate enters its 'adolescent age'" (2024) and "California law aims to expand options for compost procurement under SB 1383." https://www.wastedive.com/news/sb-1383-laws-changes-procurement-collection-requirements/727990/
4. U.S. Composting Council, "State and City Organics Bans, as of 2025." https://www.compostingcouncil.org/page/organicsbans
5. Beveridge & Diamond, "Biosolids and PFAS: A Regulatory Patchwork" (2026). https://pfas.foxrothschild.com/2026/02/biosolids-and-pfas-a-regulatory-patchwork/
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8. Waste360, "TPG to Acquire Denali Water Solutions" (2020); Synagro, "Synagro and Denali Close Mutually Beneficial Asset Transfer Agreement" (Aug 2024); PitchBook, "Denali Water Solutions Company Profile" (2026). https://www.waste360.com/mergers-acquisitions/tpg-to-acquire-denali-water-solutions; https://www.synagro.com/2024/08/22/synagro-and-denali-close-mutually-beneficial-asset-transfer-agreement/
9. PRWeb, "EQT Infrastructure Closes Sale of Synagro to Goldman Sachs' West Street Infrastructure Partners III" (2020); Synagro corporate profile. https://www.synagro.com/2020/12/22/eqt-infrastructure-closes-sale-of-synagro-to-goldman-sachs-west-street-infrastructure-partners-iii/
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13. Ask Kodiak, "NAICS 325314 — Fertilizer (Mixing Only) Manufacturing" and NAICS 32531 guide (2022). https://naics.askkodiak.com/naics/2022/325314
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15. Atlas Organics, "About — Our Process." https://atlasorganics.net/resources/about/
16. EREF / U.S. Composting Council, "2024 Composting State of Practice Survey." https://www.compostingcouncil.org/resource/resmgr/documents/2024-Composting-State-of-Pra.pdf
17. BioCycle, "Nationwide Survey: Full-Scale Food Waste Composting Infrastructure in the U.S." https://www.biocycle.net/us-food-waste-composting-infrastructure/
18. U.S. Census Bureau, 2022 Economic Census, Concentration Ratios and Receipts, NAICS 325315: 88 firms; $755,865 thousand receipts; CR4 41.9%, CR8 54.7%, CR20 75.9%, CR50 95.1%; HHI 642.8. https://data.census.gov/table/ECNSIZE2022.EC2200SIZECONCEN?q=EC2200SIZECONCEN; Iowa State CARD transcription: https://www.card.iastate.edu/files/publications/pdf/26PB51.pdf
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21. U.S. Composting Council, "Compost Throughput and Environmental Impact Survey" (2023 data, released 2025), reported via Waste360 and BioCycle: 6,002,260 tons finished compost produced; 14,379,113 tons feedstock; horticulture 2.6M / agriculture 2.3M tons end markets. https://www.waste360.com/organic-waste/us-composting-council-conducts-triennial-throughput-and-environmental-impact-survey
22. Valuates Reports, "Compost Market Size, Share and Insights 2025-2031" (global ~$5,975M in 2024; U.S. ~20.7% share); SkyQuest, "U.S. Residential Organic Compost Market" (~$407M in 2024). https://reports.valuates.com/market-reports/QYRE-Auto-32F2872/global-compost; https://www.skyquestt.com/report/us-residential-organic-compost-market
23. SEC Filing (2019), citing U.S. Composting Council $5.6B market claim — predates NAICS 325315, methodology not retrieved. https://www.sec.gov/Archives/edgar/data/1310527/000149315219004529/form10-k.htm
24. U.S. EPA, "Food: Material-Specific Data" (66.2M tons wasted food 2019; 3.3M tons composted). https://www.epa.gov/facts-and-figures-about-materials-waste-and-recycling/food-material-specific-data
25. WM (Waste Management), "Q4 and Full-Year 2024 Earnings" (2024 revenue ~$22.5B). https://investors.wm.com/news-releases/news-release-details/wm-announces-fourth-quarter-and-full-year-2024-earnings/
26. 24/7 Wall St., "Top 5 Waste Management & Landfill Stocks" (2026) — Republic Services ~$16.5B revenue, ~$67.9B market cap; companiesmarketcap.com — WM market cap ~$89B (2026). https://247wallst.com/investing/2026/01/25/top-5-waste-management-landfill-stocks-trash-cash/; https://companiesmarketcap.com/waste-management/marketcap/
27. WM (Waste Management), 2025 Form 10-K (49 organics-recycling facilities at year-end 2025). https://www.sec.gov/Archives/edgar/data/823768/000110465926012049/wm-20251231x10k.htm
28. StockTitan, "Waste Connections Reports Fourth Quarter 2024 Results" (2024 revenue ~$8.92B). https://www.stocktitan.net/news/WCN/
29. Waste Today, "GFL's 2024 results 'exceed expectations'" (2024 revenue ~$7.86B). https://www.wastetodaymagazine.com/news/gfl-q4-2024-results-exceed-expectations/
30. Casella Waste Systems, Form 8-K FY2025 results (FY2025 revenue ~$1.837B). https://www.sec.gov/Archives/edgar/data/911177/000091117726000006/cwst-ex991123125.htm
31. Casella Waste Systems, "Municipalities" / Resource Solutions segment (organics and biosolids). https://www.casella.com/municipalities/
32. Scotts Miracle-Gro, 2025 Form 10-K. https://www.sec.gov/Archives/edgar/data/825542/000082554225000022/smg-20250930.htm
33. Denali Water Solutions, "About Us" and brand pages (nation's largest manufacturer of organic soil amendments; WeCare, New Earth, Swanson Bark). https://www.denalicorp.com/about-us
34. ION Analytics / Infralogic, "Goldman Sachs markets waste business Synagro." https://ionanalytics.com/insights/infralogic/goldman-sachs-markets-waste-business-synagro/
35. Recology, "Employee Owned." https://www.recology.com/about-us/employee-owned/
36. Recology, "2023 Sustainability Report" (684,000+ tons directed to composting in 2022). https://www.recology.com/recology_news/read-our-2023-sustainability-report/
37. Cedar Grove, "About Us" (2 Washington facilities, 350,000+ tons). https://cedar-grove.com/about-us
38. Waste360, "How Composters Turn Scraps Into Scalable Profits" (contract structures, contamination costs, site development). https://www.waste360.com/organic-waste/how-composters-turn-scraps-into-scalable-profits-part-2-
39. Massachusetts Department of Environmental Protection, "Commercial Food Material Disposal Ban" (threshold lowered to 0.5 ton/week effective Nov 2022). https://www.mass.gov/guides/commercial-food-material-disposal-ban
40. CalRecycle, "SB 1383 Jurisdiction Guidance." https://calrecycle.ca.gov/organics/slcp/jurisdictions/
41. CalRecycle, "SB 1383 Procurement Guidance" (procurement requirement began Jan 1, 2022). https://calrecycle.ca.gov/Organics/SLCP/Procurement/
42. U.S. EPA, "Environmental Value of Applying Compost: Improving Soil Health" (2025). https://www.epa.gov/system/files/documents/2025-01/environmental-value-of-applying-compost.pdf
43. USDA Economic Research Service, "Organic Agriculture" (3.6M acres certified organic cropland 2021, up 79% from 2011; 17,000+ operations). https://www.ers.usda.gov/topics/natural-resources-environment/organic-agriculture
44. USDA Economic Research Service, "Despite Challenges, Research Shows Opportunity to Increase Use of Manure as Fertilizer" (4% of manure-fertilized farmland received composted manure 2015–2018). https://www.ers.usda.gov/amber-waves/2023/april/despite-challenges-research-shows-opportunity-to-increase-use-of-manure-as-fertilizer
45. Beveridge & Diamond, "Evolving State Regulation of Biosolids Recycling in the PFAS Era" and "EPA Extends Comment Period on Draft Risk Assessment for PFOA and PFOS in Biosolids"; Chemical & Engineering News, "EPA moves to cut risks from PFAS in fertilizer" (2026); U.S. EPA, "PFAS in Sewage Sludge." https://www.bdlaw.com/publications/evolving-state-regulation-of-biosolids-recycling-in-the-pfas-era/; https://www.epa.gov/biosolids/and-polyfluoroalkyl-substances-pfas-sewage-sludge
46. U.S. EPA, "EPA Releases Draft Risk Assessment to Advance Scientific Understanding of PFOA and PFOS in Biosolids." https://www.epa.gov/newsreleases/epa-releases-draft-risk-assessment-advance-scientific-understanding-pfoa-and-pfos
47. U.S. Composting Council, "State of Your State" (state-by-state regulatory overview). https://www.compostingcouncil.org/page/state-of-your-state
48. USDA National Organic Program, Guidance 5021 (pathogen control — 131°F for 3+ days). https://www.ams.usda.gov/rules-regulations/organic/handbook/5021
49. U.S. Composting Council, "Site Development Basics." https://hub.compostingcouncil.org/site-development-basics/
50. U.S. Composting Council / EREF, "USCC-EREF Release Report on Composting Practices in the U.S." (labor and contamination as top concerns). https://www.compostingcouncil.org/news/665609/USCC-EREF-Release-Report-on-Composting-Practices-in-the-U.S..htm
51. U.S. Composting Council, "Public-Private Partnerships." https://hub.compostingcouncil.org/public-private-partnerships/