Water, Sewage and Other Systems — NAICS 2213

A rollup primer for both public-market and private investors. NAICS 2213 is a NAICS industry group (4-digit) — the North American Industry Classification System is the federal code set used to organize U.S. business statistics. This level is a genuine rollup of three different businesses: drinking water, wastewater, and district energy. Core figures are U.S. federal statistics; company detail lives in the three child primers.

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1. Overview

NAICS 2213 groups the three "networked" utilities that pipe something other than electricity or gas to your building: drinking and irrigation water (221310), wastewater/sewage treatment (221320), and steam, hot water, and chilled water — "district energy" (221330). All three share the same investor-relevant DNA: each system is a local natural monopoly (once the pipes are in the street, no one builds a competing network), demand is recession-resistant, and the assets are old and expensive to replace — which turns mandated upgrades into a decades-long spending cycle.[7][11]

But the three children are not interchangeable, and that contrast is the whole point of looking at 2213 as a group rather than at one utility bill. They differ in size (water is ~13× the size of district energy), in who owns them (from ~84% municipal in water to ~98% government in sewage to fund-and-campus ownership in district energy), in concentration, and in how — or whether — a public-market investor can touch them. This page leads with those differences, then covers the group as a whole.

The single most important structural fact spans all three: most of this infrastructure is owned by governments, not companies. That is why federal business statistics undercount the group, and it is exactly why private capital treats the municipal majority as a consolidation target.[3][8]

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2. What's inside — how the three children differ

NAICS builds industries as a nested tree; at the 4-digit level, 2213 has three 6-digit children.[1] Here is the contrast an investor should lead with:

Four contrasts do the work:

• Size. Water dwarfs the other two. Drinking water is ~82% of the group's receipts; sewage ~12%; district energy ~6%.[2] So when you buy "the group," you are ~80% buying the water story.
• Ownership. All three are government-heavy, but on a gradient: water is ~84% municipal (leaving a real ~13% investor-owned slice you can buy),[3] sewage is ~98% government (almost nothing to buy directly),[8] and district energy is an oligopoly of local monopolies owned by infrastructure funds, universities, and cities.[13][14]
• Concentration. Counter-intuitively, each child is more concentrated than the group. The four largest firms hold 39.9% of water, 54.6% of sewage, and 69.4% of district energy — but only 34.7% of the whole group.[1][2] Pooling three separate local-monopoly markets dilutes measured concentration, because a big water firm is not competing with a big steam firm. Read the group CR4 as a statistical artifact, not as evidence of competition.
• Direction of travel. Water and sewage are in growth modes driven by mandated replacement of aging pipes and treatment plants; district energy has shrinking thermal volumes (efficiency, warm winters, building-level heat pumps) but rising capital intensity as fossil plants are converted.[7][11][12]

Scope note. The group excludes electric power (2211) and natural gas distribution (2212), bottled water manufacturing (312112), septic pumping (562991), and pipeline/sewer-line construction (237110). Full boundaries are in each child primer.

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3. Size — this level's ground-truth figures

The figures below are our ingested federal statistics for NAICS 2213 as a whole. They tie out cleanly to the three children (the child receipts sum to the group total; establishments and employment match exactly), which is why the shares in Section 2 are precise rather than estimated.

The HHI was suppressed by the Census Bureau for this group, so we do not state one.[2]

Undercount caveat — read this before trusting the size. These are business statistics, and they capture mainly the private, for-profit slice of each child. Government ownership dominates all three: ~84% of community water systems, ~98% of wastewater systems, and the majority of district-energy plants (universities, hospitals, cities, military bases) sit outside the Census Bureau's business surveys.[3][8][13] So the $19.96 billion is best read as the private-sector baseline, not the size of the underlying service. The physical asset base is worth vastly more: the EPA's (U.S. Environmental Protection Agency) 20-year need is ~$625 billion for drinking water and ~$630 billion for wastewater alone, and the American Society of Civil Engineers (ASCE) values wastewater assets at over $1 trillion and grades drinking water "C-" and wastewater "D+".[4][7][11] District energy is smaller but similarly understated — integrated utilities code steam to their electric line, so New York's Con Edison steam operation alone booked ~$703 million in 2025, more than half the entire national 221330 census total.[12] Treat the capital-needs and physical-inventory numbers, not the receipts, as the gauge of scale.

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4. The investable universe — where the value concentrates

The group's public-market value is overwhelmingly a water story; sewage and district energy offer almost no direct listed exposure.

Listed (mostly water). The buyable equities are a short list of regulated water utilities that also carry the group's small wastewater leg: American Water Works (NYSE: AWK), Essential Utilities (NYSE: WTRG), American States Water (AWR), California Water Service (CWT), SJW Group / H2O America (SJW), and smaller names — Middlesex Water (MSEX), York Water (YORW), Artesian Resources (ARTNA), and reuse-tilted Global Water Resources (GWRS).[20] These serve the investor-owned utility (IOU) slice — utilities owned by private companies rather than governments. Wastewater rides inside them as the smaller, faster-growing leg (for AWK, ~$422 million, or 9%, of regulated revenue).[8] The defining event is AWK's pending ~$20.24 billion all-stock acquisition of Essential Utilities (announced October 27, 2025), creating a ~$40 billion platform serving ~19.5 million people across 17 states, targeting a Q1 2027 close.[10]

No pure play for sewage or district energy. There is no listed "sewage-treatment" stock and no U.S. "district-energy" stock. For district energy the closest listed name is Consolidated Edison (NYSE: ED), whose Manhattan steam system is only ~4% of a large electric-and-gas utility; KKR (NYSE: KKR) and Antin (Paris: ANTIN) offer only look-through manager fees from the funds that own the assets.[12][14]

Where the value actually sits — private and government. Across all three children the bulk of the assets are outside the stock market:

• Municipal departments and districts — the ~84% of water, ~98% of sewage, and the many city/federal district-energy systems. This is the pool private capital is consolidating.[3][7][8]
• Private contract operators — Veolia, Jacobs, and Inframark run a large share of outsourced water/wastewater operations (~81% of outsourced O&M capacity), and New Mountain Capital's 2026 Inframark–Azuria combination tops $2.5 billion in revenue.[15]
• Infrastructure-fund platforms — in district energy, Vicinity Energy (Antin), Cordia (KKR), and CenTrio (QIC/Ullico); in water/wastewater, funds rolling up small regulated systems.[14]

Full company tables, market caps, and private-owner detail live in the three child primers.

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5. How the money works — shared engine, three variations

The group shares one core engine and splits by owner type.

• Regulated, investor-owned (the main public-equity route). Water and wastewater IOUs, and Con Edison's steam utility, earn the classic utility formula: allowed earnings ≈ rate base × approved equity share × allowed return on equity (ROE). A state Public Utility Commission (PUC) tallies invested capital (pipes, plants, meters) as the rate base, then sets customer rates to recover operating costs, depreciation, plus a set profit percentage — the allowed ROE, recently ~9.5%–10.3% for water.[17][20] So capital spending is the growth story: every dollar invested and allowed into the base enlarges what the utility earns on. Returns are dented by regulatory lag — the delay between spending and the rate increase that recovers it — which states soften via decoupling and infrastructure surcharges.[19]
• Municipal (the largest owner class). Cities run systems to break even, recovering costs through user charges and funding capital with tax-exempt revenue bonds — a cheap-financing edge private buyers must beat on efficiency.[18]
• Contract operators and concessions (asset-light). Operators earn management and operating fees under multi-year operations-and-maintenance (O&M) or design-build-operate (DBO) contracts, not a rate-base return. In district energy, merchant platforms sign 20–50-year energy-service agreements (fixed capacity charge + commodity pass-through, often take-or-pay), and campus public-private partnerships (P3s) pay a large upfront sum for a 40–50-year utility concession.[14][19]

Where the children diverge economically. Water is the cleanest rate-base compounder (biggest IOU slice). Sewage runs the same formula but on a tiny for-profit base, so most of it is municipal break-even economics plus operator fees. District energy is the most varied: rate-regulated (ConEd steam, which under-earns — 6.65% actual vs. a 9.25% authorized ROE in 2025), merchant/contract, and concession models all coexist, and it is the only child with a merchant/contract pricing layer.[12][19]

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6. Demand drivers

Growth across the group is not about selling more volume — water usage is flat to falling and district-heat volumes are declining — but about mandated replacement and treatment upgrades that regulators let owners earn a return on.

• Aging infrastructure. Drinking water scored "C-" and wastewater "D+" on the ASCE's 2025 report card; the EPA puts 20-year needs at ~$625 billion (water) and ~$630 billion (wastewater).[4][7][11]
• Lead and contaminants. An estimated 9+ million lead service lines must be replaced within a decade under the EPA's 2024 Lead and Copper Rule Improvements, and the EPA's 2024 PFAS drinking-water limits (per- and polyfluoroalkyl substances — long-lasting "forever chemicals") force treatment spending, with a 2026 revision proposal in flux.[5][6]
• Population and reuse. Wastewater's served population is projected to rise from 270.4 million (2022) to 287.4 million by 2042, plus growing water-reuse and resource-recovery investment.[7]
• Decarbonization (district energy). Building-emissions mandates (New York City's Local Law 97, Boston's BERDO) push campuses and downtowns to swap fossil boilers for electric boilers, heat pumps, and thermal storage — a capital cycle over a shrinking volume base.[21]

Each mandate is double-edged: it forces spending, but that spending grows the rate base owners earn on.

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7. Regulation

All three children face two separate referees that do not move in lockstep, which is the structural source of regulatory lag:

• Economic regulators — state PUCs set rates, allowed ROE, and cost recovery for the investor-owned portion only (most visibly for water IOUs and for Con Edison's steam rate plan). Municipal systems set rates through local boards.[17]
• Quality/environmental regulators — the EPA sets standards for all systems, public or private: the Safe Drinking Water Act (lead, PFAS limits) for water; the Clean Water Act and its National Pollutant Discharge Elimination System (NPDES) discharge permits plus biosolids rules for sewage; and Clean Air Act rules that drive fuel-switching for district energy.[6][7]

The live wildcard across water and sewage is PFAS — quality rules can force sudden spending, but the money arrives only after a rate case. A structural growth channel unique to district energy is thermal energy network (TEN) legislation (New York's 2022 law and others), which lets utilities rate-base networked-geothermal systems.[18] The Federal Energy Regulatory Commission (FERC) touches the group only when a district-energy plant sells power to the grid; it does not regulate water or sewer rates.

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8. Consolidation

The unifying thesis across the group: thousands of small, cash-strapped, mostly municipal systems sell to better-capitalized buyers — listed utilities and, increasingly, private infrastructure funds.

• Water and sewage. The accelerant is fair-market-value (FMV) laws, adopted in about 13 states, which let an acquirer put a municipal system's higher appraised value (rather than depreciated book value) into rate base — making deals more profitable and giving cities a reason to sell.[16] American Water closed 13 acquisitions in 2024 and guides to 15–25 deals a year; layered on the AWK–Essential merger, this is the clearest secular trend in the sector.[8][10]
• District energy. A national oligopoly of local monopolies is being assembled by infrastructure capital — Antin bought Veolia's U.S. business (→ Vicinity), KKR bought Clearway's (→ Cordia), and Brookfield sold its platform for ~$4.1 billion — alongside billion-dollar campus P3s.[14]

Expect M&A to stay active across all three children.

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9. Risks

The group's risks are shared, with different emphasis by child:

• Regulatory and affordability risk. Profit for the IOU slice depends entirely on regulators, who can grant a lower ROE or deny a rate increase — especially as bills rise and investor-owned systems already charge meaningfully more than public ones.[20]
• Interest-rate sensitivity. All three are capital-heavy and debt-financed; the listed water names trade as "bond proxies" (income holdings whose prices tend to fall when rates rise).[20]
• Compliance and contamination liability. PFAS, lead, and biosolids spending is recoverable eventually, but owners face remediation, litigation, and the risk regulators disallow some spending.[6][7]
• Stranded-asset and bypass risk (district energy specific). Mandatory fossil-plant conversion can strand assets, and customers leaving for building-level heat pumps trigger a fixed-cost spiral over declining volume.[12]
• Execution/approval risk. Big deals need multi-state approvals and years of integration; the AWK–WTRG merger is still pending.[10]
• Operational. Cyberattacks on plant control systems, an aging operator workforce, construction inflation, and wet/dry-weather volume swings.

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10. How to invest & outlook

Which parts are attractive vs. at risk. The most investable and defensible part of the group is regulated water (and the wastewater riding inside it) — the biggest child, the deepest listed roster, and the clearest rate-base growth. Sewage offers essentially the same engine but almost no direct equity: reach it through the same water utilities, through contract operators, or through tax-exempt municipal sewer revenue bonds (the most accessible fixed-income exposure). District energy is the smallest and most specialized — a slow-growing core with a decarbonization capital supercycle, and no pure public play, so it is naturally a private-market allocation (infrastructure funds, campus concessions, TEN rate-basing).

Two ways in.

• Public markets: own the listed water utilities — classic defensive, dividend-growth compounders with yields roughly 2.3%–4.3%, trading at premium price-to-earnings (P/E) multiples (AWK ~24×, WTRG ~18×) you pay for monopoly protection and visible rate-base growth — or diversified water ETFs (Invesco Water Resources, PHO; First Trust Water, FIW) and picks-and-shovels equipment/engineering suppliers.[20]
• Private markets: infrastructure and water-focused funds, direct system ownership and operation, O&M/DBO platforms, campus P3s, and municipal/project bonds — the same rate-base and fee engines, often augmented by rolling up small municipal systems.

Near-term drivers to watch: (1) rate-base growth funded by the lead/PFAS/pipe-and-plant replacement capital cycle across water and sewage;[4][6][7] (2) municipal consolidation accelerated by FMV laws;[16] (3) the AWK–Essential merger closing (~Q1 2027);[10] (4) PFAS rule revisions and state PUC ROE decisions, which set how much mandated spending actually earns a return;[6][20] and (5) building-decarbonization mandates and thermal-network legislation in district energy.[18][21]

Bottom line. NAICS 2213 is three defensive, regulation-driven local-monopoly utilities bolted together — but they are not equals. Water is the large, growing, investable core; sewage is the same economics with almost nothing to buy directly; district energy is a small, fragmented niche in a decarbonization retrofit cycle, reachable mainly through private capital. Buying "the group" is ~80% a bet on regulated water and its mandated, decades-long spending cycle.

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Sources

1. U.S. Census Bureau — County Business Patterns 2023 and 2022 Economic Census, NAICS 2213 and children 221310 / 221320 / 221330 (establishments 5,210; employees 52,028; payroll; and NAICS hierarchy / exclusions). https://www.census.gov/programs-surveys/cbp.html; https://www.census.gov/naics/
2. U.S. Census Bureau — 2022 Economic Census, NAICS 2213 and children (receipts $19,962,733k total; 4,321 firms; concentration CR4 34.7% / CR8 45.7% / CR20 59.3% / CR50 69.7%; HHI suppressed; child receipts 221310 $16.28B, 221320 $2.420B, 221330 $1.263B). [Core figures per Histometrics ingested federal statistics for NAICS 2213.] https://data.census.gov/table/ECNBASIC2022.EC2222BASIC
3. U.S. Environmental Protection Agency — Safe Drinking Water Information System (SDWIS) and drinking-water program data (community water system ownership: ~84% government-owned, serving ~87% of population). https://www.epa.gov/ground-water-and-drinking-water
4. U.S. EPA — 7th Drinking Water Infrastructure Needs Survey and Assessment (2023); ~$625B 20-year drinking-water need. https://www.epa.gov/dwsrf
5. U.S. EPA — Lead and Copper Rule Improvements (LCRI), October 2024 (replace ~9M+ lead service lines within 10 years). https://www.epa.gov/ground-water-and-drinking-water/lead-and-copper-rule
6. U.S. EPA — PFAS National Primary Drinking Water Regulation (April 2024) and 2026 revision proposal; PFAS wastewater/biosolids assessments. https://www.epa.gov/sdwa/and-polyfluoroalkyl-substances-pfas
7. U.S. EPA — 2022 Clean Watersheds Needs Survey (CWNS) Report to Congress (2024): 17,544 publicly owned treatment works (POTWs) serving 270.4M / 82%; ~$630.1B total need; 287.4M served projected by 2042. https://www.epa.gov/system/files/documents/2024-05/2022-cwns-report-to-congress.pdf
8. American Water Works Company — 2025 Form 10-K (~98% of U.S. wastewater systems government-owned; wastewater ~$422M / 9% of regulated revenue; fair-market-value laws; acquisition cadence). https://www.sec.gov/Archives/edgar/data/1410636/000141063626000034/awk-20251231.htm
9. Essential Utilities — Full-Year 2025 Results, February 2026 (~5.5M people, 9 states; municipal wastewater acquisitions). https://www.essential.co/news-releases
10. American Water & Essential Utilities — merger announcement, October 27, 2025 and 2026 state-approval updates (~$20.24B / ~$40B combined; 0.305 exchange ratio; ~19.5M people, 17 states; ~$29.3B rate base; Q1 2027 target). https://ir.amwater.com/news-and-events/financial-releases
11. American Society of Civil Engineers — 2025 Report Card for America's Infrastructure: Drinking Water (C-) and Wastewater (D+, assets valued >$1T). https://infrastructurereportcard.org
12. Consolidated Edison, Inc. — Form 10-K FY2025 (steam revenue ~$703M; steam ≈4% of consolidated revenue; steam peak demand ~-0.9%/yr; steam authorized ROE 9.25% vs. 6.65% actual for 12 months ended 12/31/2025). https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001047862&type=10-K
13. U.S. Energy Information Administration / ICF / IDEA — U.S. District Energy Services Market Characterization (2018; 2012 data: ~660 systems; university/hospital/municipal ownership). https://www.eia.gov/analysis/studies/buildings/districtservices/pdf/districtservices.pdf
14. District-energy infrastructure owners — Antin/Vicinity ($1.25B, 2019), KKR/Cordia (~$1.9B, 2021), QIC-Ullico/CenTrio, Brookfield sale (~$4.1B, 2021); university campus P3s. https://cordiaenergy.com/about-us/; https://www.vicinityenergy.us/
15. Contract operators — Veolia (550+ communities), and Bluefield Research, U.S. Municipal Water & Wastewater Utility Outsourcing Market (Veolia / Jacobs / Inframark ~81% of outsourced O&M); New Mountain Capital Inframark–Azuria combination, April 2026 (>$2.5B revenue). https://www.bluefieldresearch.com/download/36547
16. National Association of Water Companies — fair-market-value legislation tracker (~13 states as of 2024). https://nawc.org
17. National Association of Regulatory Utility Commissioners (NARUC) — Ratemaking Fundamentals and Principles (rate-base × allowed-return model). https://www.naruc.org/commissioners-desk-reference-manual/3-ratemaking-fundamentals-and-principles/
18. New York State — Utility Thermal Energy Network and Jobs Act (UTENJA, 2022) and thermal-energy-network pilots (utility rate-basing of networked geothermal). https://buildingdecarb.org/
19. IBISWorld — Water Supply and Irrigation Systems in the US (broader definition; decoupling/infrastructure-surcharge context) and district-energy energy-service-agreement structures. https://www.ibisworld.com
20. Company filings and market data (approximate, mid-2026): market capitalizations, revenue, dividend yields (~2.3%–4.3%), P/E multiples (AWK ~24×, WTRG ~18×), and allowed-ROE / rate-case benchmarks (~9.5%–10.3%) for AWK, WTRG, AWR, CWT, SJW, MSEX, YORW, ARTNA, GWRS; water ETFs PHO and FIW.
21. Building-decarbonization mandates — New York City Local Law 97 (2019) and City of Boston BERDO. https://www.nyc.gov/site/sustainablebuildings/ll97/local-law-97.page; https://www.boston.gov/departments/environment/berdo

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Ground-truth note: core NAICS 2213 statistics (receipts, firm/establishment counts, employment, payroll, concentration ratios) are taken from official U.S. Census Bureau data; the group HHI is suppressed and is not stated. Federal business statistics undercount this group because the large majority of U.S. water, sewage, and district-energy systems are government/municipally owned and fall outside private-business surveys — the single most important structural fact about the sector. The three child industries (221310 water, 221320 sewage, 221330 district energy) differ materially in size, ownership, concentration, and investability; this page contrasts them and points to the child primers for full detail.