Waste Treatment and Disposal (U.S.) — NAICS 5622

A short rollup primer for a general investing audience — relevant to both public-market and private investors. This is the North American Industry Classification System (NAICS) 2022 four-digit industry group 5622, "Waste Treatment and Disposal," inside subsector 562 (Waste Management and Remediation Services) within sector 56 (Administrative and Support and Waste Management and Remediation Services). This level contains exactly one child industry — 56221, of the same name — so 5622 and 56221 are effectively the same thing. This page gives the level's own ground-truth federal statistics and a brief orientation, then points you to the 56221 primer for the full story.[1]

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1. Overview

This is the disposal endpoint of the American waste economy — the permitted facilities where waste actually gets treated, buried, or burned, as distinct from the trucks that collect it or the plants that recycle it. Every business in this level sells one thing: scarce, permitted disposal capacity, priced per ton. Owners earn high margins on each extra ton put through a mostly-fixed-cost asset, and are protected by regulation that both manufactures demand (the law forbids dumping waste elsewhere) and blocks new competition (almost no new disposal sites get permitted). The result is an infrastructure-like, cash-generative, recession-resistant complex — waste keeps arriving in booms and busts alike.[1]

2. What's inside — and why this level equals its one child

NAICS is a nested system: the four-digit industry group 5622 rolls up to a single five-digit industry, 56221, which in turn splits into four six-digit national industries. Because 56221 is the only child of 5622, the two levels cover exactly the same facilities, the same firms, and the same dollars. There is nothing in 5622 that is not in 56221.

The real internal variety lives one level down, inside 56221's four children:

• 562211 — Hazardous Waste Treatment & Disposal (incinerators, secure landfills, treatment plants for toxic waste) — ~36% of level receipts; the growth story.
• 562212 — Solid Waste Landfill (engineered nonhazardous burial sites) — ~50% of level receipts; the cash core.
• 562213 — Solid Waste Combustors & Incinerators (waste-to-energy plants) — ~6%; mature and slowly shrinking.
• 562219 — Other Nonhazardous Treatment & Disposal (composting, anaerobic digestion, liquid/industrial-waste treatment) — ~8%; small but fastest-changing.[1]

In one line: the cash is in landfill, the growth is in hazardous and organics, and the decline is in incineration. For the full contrast — who owns each child, how the economics differ, and how you can buy in — read the 56221 primer. This page does not duplicate it.

3. How big it is (this level's rollup figures)

Federal ground-truth for NAICS 5622 (our supplied statistics). Because this level equals its one child, these figures also match 56221 exactly. Note the mixed vintages: the Economic Census (receipts, firms, concentration) is 2022; County Business Patterns (CBP; establishments, employment, payroll) is 2023.

A few quick reads: average pay is roughly $81,000 per employee ($5.09B ÷ 62,599)[3] — skilled, licensed, technical work, not minimum-wage labor. Receipts run about $15 million per firm and $7.4 million per establishment[2][3] — capital-heavy sites, not storefronts.

Undercount and scoping caveats (large at this level).

• CBP is an employer-based series and the Economic Census generally excludes government-owned establishments.[3] The disposal endpoint is unusually governmental: a large share of active municipal landfills, many waste-to-energy plants (publicly owned, privately operated), and thousands of municipal composting sites sit mostly outside the ~$24.76B receipts figure.
• The figure also excludes captive on-site treatment (refineries, chemical plants, and mills that treat their own waste) and federal (Departments of Defense and Energy) hazardous and radioactive programs, which are large but budget-funded rather than commercial revenue.[1]
• Big integrated operators book much of their money under adjacent codes (collection, remediation, recycling), so any single-NAICS figure understates the total economics around waste disposal.
• Our federal file for this level contains no tonnage, capacity, utilization, tipping-fee, margin, or growth figure; none is invented here. (The U.S. Small Business Administration sets a $47 million average-receipts small-business threshold for the disposal industries; that figure comes from the SBA, not from this file.)[4]

4. The investable universe — where value concentrates

There is no public company that maps cleanly to NAICS 5622/56221. The listed names are diversified operators; each child's exposure is a segment inside a broader business. Value concentrates in two places: landfill — the profit core inside the integrated waste majors (Waste Management, Republic Services, Waste Connections, GFL Environmental, Casella Waste Systems) — and hazardous, where Clean Harbors is the near-pure-play and Veolia the international alternative. Incineration and organics have no listed pure-play; public exposure there is indirect at best, and most of those assets are held privately or by municipalities. See the 56221 primer for the full roster, tickers, and ownership map.[1]

5. How the money works

The model rhymes across the whole level: volume × price × utilization, protected by permits, offset by long-tail liabilities. Customers pay gate / tipping fees per ton to drop waste; because these are high-fixed-cost assets, every ton above breakeven is nearly pure margin, so utilization is the master metric. The permit is the moat — a finite, permitted volume that almost no one can replicate, which hands pricing power to whoever already owns capacity. A secondary energy-and-credit line runs through the level (landfill-gas and digester renewable natural gas, waste-to-energy electricity, and environmental credits) — high-margin, fast-growing, and policy-dependent. The offset is closure and post-closure liability: landfills fund ~30 years of monitoring, and hazardous operators carry cleanup and financial-assurance obligations. Full mechanics are in the 56221 primer.[1]

6. What drives demand

• Regulatory necessity — the baseline. Generators must move waste through a documented, permitted chain; they cannot legally dump it elsewhere. Regulation is effectively this industry's sales force.[1]
• Economic activity. Waste tracks population, consumption, construction, and industrial output; municipal trash is defensive, while construction/industrial/hazardous volumes are more cyclical.[1]
• Reshoring and industrial policy. New U.S. factories generate fresh hazardous and industrial streams — a tailwind landing mostly in hazardous.[1]
• PFAS — the shared wild card. The 2024 Environmental Protection Agency (EPA) designation of two "forever chemicals" (per- and polyfluoroalkyl substances, or PFAS) as hazardous substances is a demand driver for hazardous treatment but a liability overhang for landfills and organics.[1]
• Diversion mandates pull tonnage away from landfills and incinerators toward composting/organics — a headwind for two children and a tailwind for another.[1]

7. Regulation

Regulation is both the demand engine and the barrier to entry — the defining feature of the level. The Resource Conservation and Recovery Act (RCRA, 1976) governs waste "cradle to grave": Subtitle C covers hazardous facilities (which need a treatment, storage, and disposal facility, or TSDF, permit), and Subtitle D sets the floor for nonhazardous landfills. CERCLA / Superfund (1980) assigns cleanup liability, and its 2024 PFAS designation both expands cleanup work and creates new liability. The Clean Air Act limits incinerator emissions and requires gas collection on large landfills. State permitting and "not in my backyard" (NIMBY) opposition are the main practical barrier to new capacity — a curse for entrants and a gift to whoever already owns permitted sites. Detail by child is in the 56221 primer.[1]

8. Consolidation

The level looks only mildly concentrated — but the average misleads. The combined HHI is 537 and CR4 is 38.5%,[2] technically "unconcentrated." It stays low mainly because different giants lead different children — landfill majors dominate one, Clean Harbors dominates hazardous incineration, infrastructure-owned platforms dominate waste-to-energy — so no single firm rules the combined code. Inside the children, concentration ranges from a near-monopolized incineration niche to a genuinely fragmented composting field. And because disposal is a local business (transport cost and community acceptance limit alternatives), a single site often behaves as a local near-monopoly regardless of the national ratio. Since you cannot easily permit new capacity, the way to grow is to buy it, and the past few years have been a consolidation wave. Deal-by-deal history is in the 56221 primer.[1]

9. Risks

The main risks are shared across the level: PFAS regulatory uncertainty (the swing factor — a growth driver for hazardous but a cost overhang for landfills and organics); cyclicality in construction/industrial/hazardous volumes; environmental incidents and decades-long closure liability; subsidy dependence in the energy-and-credit line; cost inflation outrunning pricing; structural decline in incineration; and measurement/misclassification risk — no listed company maps to this NAICS level, so reported "environmental services" revenue is not the same as 5622 revenue. Full risk treatment is in the 56221 primer.[1]

10. How to invest, and the outlook

Public-market routes match the vehicle to the child: the integrated majors (Waste Management, Republic Services, Waste Connections, GFL, Casella) for the landfill cash core; Clean Harbors (and Veolia) for the hazardous growth pure-play; renewable-natural-gas developers for the energy/organics theme; and essentially no direct listed access to incineration or most of organics. Private-market routes are where most of the level actually lives — direct facility ownership, infrastructure and private-equity funds, project finance, private credit, and municipal bonds (a fixed-income way in, since so many disposal sites are government-owned).

Outlook (forward-looking judgment). Because 5622 equals its one child, the outlook is 56221's: a durable, cash-generative, regulation-driven disposal-infrastructure complex whose four children head in different directions — steady landfill cash, hazardous growth (regulation permitting), structural but small organics growth, and slow incineration decline. Consolidation should continue, with scarce permitted assets commanding premium prices. The central question is not "how much waste exists?" but "which owner controls the best permitted capacity — in the fastest-growing children — at the lowest all-in regulatory and environmental risk?" For the detail behind every claim on this page, see the 56221 primer.

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Sources

1. Child primer — Waste Treatment and Disposal (NAICS 56221) — the single child of this industry group, and the source for all cross-child detail (the four six-digit industries, ownership maps, tickers, deal history, and full regulatory and risk treatment). Built on U.S. Census Bureau 2022 NAICS definitions, Economic Census 2022, County Business Patterns 2023, company Form 10-K filings (Waste Management, Republic Services, Waste Connections, GFL, Casella, Clean Harbors, Veolia, Perma-Fix, OPAL/Montauk), and EPA RCRA / CERCLA / Clean Air Act / PFAS materials. (Full source list in the 56221 primer.)
2. U.S. Census Bureau, 2022 Economic Census — Concentration of Largest Firms, NAICS 5622 (receipts ~$24.76B; 1,630 firms; CR4 38.5% / CR8 54.5% / CR20 71.0% / CR50 80.5%; HHI 537). https://www.census.gov/programs-surveys/economic-census.html
3. U.S. Census Bureau, County Business Patterns: 2023, NAICS 5622 (3,326 establishments; 62,599 employees; ~$5.087B annual payroll; ~$1.253B Q1 payroll); CBP methodology (employer-only coverage; excludes most government employees). https://www.census.gov/programs-surveys/cbp.html
4. U.S. Small Business Administration, Table of Small Business Size Standards, 2023 (disposal industries threshold = $47.0M avg. annual receipts). https://www.sba.gov/document/support-table-size-standards