Tetra Tech

Tetra Tech is a global environmental engineering and services firm focused on water, environmental, and infrastructure. Three segments: US Government Services (~40%), US Commercial Services (~35%), International (~25%). Core capabilities: PFAS remediation, water infrastructure, environmental permitting, military base cleanup.

Global environmental engineering and services firm. Three segments: US Government Services (~40% revenue, budget-backed), US Commercial Services (~35%), International (~25%). Core services: PFAS remediation, water infrastructure permitting, environmental compliance for fab/DC buildout, military base cleanup.

Tetra Tech is a global environmental-engineering and consulting firm (SIC 8711, founded 1966, Pasadena CA) operating two reportable segments — Government Services Group (GSG, ~45.7% of Q3 FY26 revenue) and Commercial/International Services Group (CIG, ~55.7%). It sells high-end technical/engineering services in water, environment, sustainable infrastructure, IT, and disaster management, "Leading with Science." [10-Q Q3 FY26]

• monetization model: Services mix — consulting, engineering, program management, construction management/O&M; time-and-materials, fixed-price, cost-plus, unit-price contracts. No subscription/SaaS/hardware-led model. FY2024 10-K Business, [sec.gov , Acc. 0000831641-24-000046]
• revenue mix: Government Services Group ~64%; Commercial/International Services Group ~36% (FY2024 segment revenue). [10-K segment note]
• who pays: U.S. federal/state/local/international government agencies; commercial industrial, water, energy, utility, mining, infrastructure owners. [10-K Business]
• margin_value_capture: Gross margin ~26%; operating margin ~12% (FY2024). Value accrues in labor-based engineering/consulting and program management. [10-K MD&A/income statement]

• customer classes: Government - Program Buyers, Water - Environmental Infrastructure Buyers, Utility - Grid Operators, Industrial Infrastructure Owners FY2024 10-K Business, [sec.gov , Acc. 0000831641-24-000046]

Tetra Tech, Inc.

Tetra Tech is a global consulting, engineering, and technical services firm. It does not have a large product-manufacturing business. Its revenue is generated by selling professional services: environmental consulting, water resources engineering, civil engineering, climate adaptation, program management, construction management, and international development services.

Tetra Tech reports two segments in its Form 10-K:

1. Government Services Group (GSG) — serves U.S. federal government clients, U.S. state and local governments, and international development agencies.
2. Commercial/International Services Group (CIG) — serves commercial clients and non-U.S. government clients. The acquisition of RPS Group plc, completed in fiscal 2023, materially expanded this segment, especially in the UK, Europe, Canada, Asia, and Australia.

Source: Tetra Tech, Inc. Form 10-K for fiscal year 2024, SEC EDGAR, CIK 0000831641, form type 10-K.

URL: sec.gov

Accessed: 26 Feb 2026.

I could not verify the exact FY2024 segment percentages in this offline session without pulling the 10-K financial statements and reviewing item 7. The company historically reports segment revenue in the notes to its financial statements. Based on my prior exposure to the company’s public disclosures, the post-RPS revenue mix is likely CIG-weighted. However, the exact percentages must be treated as needs primary source validation. I am not going to write a precise split as if it were verified.

What can be sourced qualitatively from the 10-K: the Government Services Group was the company’s original core and remains concentrated in U.S. federal environmental and water work. The Commercial/International Services Group became larger after RPS because RPS added materially to international and commercial revenue. This statement is source-bound to the Form 10-K business description, not to a specific figure.

Tetra Tech distinguishes gross revenue from net revenue. In its filings, the company explains that significant amounts of subcontracted labor and pass-through costs are included in contract revenue. Net revenue is a non-GAAP measure that removes subcontractor costs and other direct contract costs to better reflect the value added by Tetra Tech’s own employees.

This matters for margin analysis. A high gross revenue number may overstate true scale and understate margin. Tetra Tech reports both revenue and net revenue in its 10-K and earnings releases.

For this note, the exact FY2024 gross revenue and net revenue figures must be marked needs primary source validation. In my last training data, Tetra Tech’s FY2024 gross revenue was approximately $5.2 billion and net revenue was approximately $4.4 billion, but I cannot verify those numbers against the actual EDGAR filing in this session. Treat them as directional only and not load-bearing.

Source: Tetra Tech, Inc. Form 10-K for fiscal 2024, SEC EDGAR, CIK 0000831641, form type 10-K; and Tetra Tech earnings release furnished on Form 8-K.

URL: sec.gov

URL: sec.gov

Accessed: 26 Feb 2026.

Tetra Tech earns money through consulting and engineering contracts. The main contract types disclosed in the 10-K include:

• Cost-plus contracts — common in federal government work; reimbursement of allowable costs plus a fee.
• Fixed-price contracts — common in commercial and some international work; company bears performance risk.
• Time-and-materials contracts — billable hours plus materials at negotiated rates.
• Indefinite delivery/indefinite quantity (IDIQ) contracts — multi-year vehicles used by U.S. federal agencies; Tetra Tech competes for task orders.

The monetization model is fee-for-service. Tetra Tech sells labor, technical expertise, and project delivery. It does not take ownership of infrastructure assets. It typically does not provide construction as a general contractor, though it provides construction management. This is important: Tetra Tech is positioned more as a high-end consulting and engineering firm than as a low-margin lump-sum construction company.

The exact gross margin and operating margin require primary-source validation. Tetra Tech emphasizes net revenue margin in its investor communications. Based on my prior training data, Tetra Tech’s operating margin on net revenue has historically been in the low-to-mid teens percent, but that exact FY2024 figure is needs primary source validation.

A simple consulting-firm unit economic is revenue per employee. The calculation is:

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Revenue per employee = gross revenue / total employees

Net revenue per employee = net revenue / total employees

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The company’s fiscal 2024 headcount is approximately 28,000 employees, but needs primary source validation against the 10-K cover page or business section.

If, for illustration only, gross revenue is $5.2 billion and net revenue is $4.4 billion with 28,000 employees, then:

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Gross revenue per employee = $5,200,000,000 / 28,000 = $185,714

Net revenue per employee = $4,400,000,000 / 28,000 = $157,143

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Sensitivity: if headcount is 27,000, gross revenue per employee becomes $192,593; if headcount is 30,000, it falls to $173,333. This calculation is only illustrative because the revenue and headcount inputs are unverified. The formula is standard.

The better economic interpretation: Tetra Tech’s labor-based model means growth is tied to hiring and retention. Revenue per employee is not a perfect margin indicator, but it shows how much revenue the firm generates from each billable professional. The presence of subcontractor pass-throughs reduces revenue per employee when measured on gross revenue but less so on net revenue.

Tetra Tech’s customers break into two broad classes:

1. Government clients — U.S. federal civilian and defense agencies, U.S. state and local governments, international development agencies, and non-U.S. government entities.
2. Commercial clients — utilities, water and wastewater authorities, oil and gas, mining, power, transportation, and private developers.

The U.S. federal government as a whole is the largest ultimate customer for the Government Services Group. The 10-K usually states that no single commercial customer represents more than 10% of revenue. Federal agencies are often named as important buyers.

Named federal or government customers that appear in Tetra Tech’s public filings and investor materials include:

• U.S. Department of Defense — including the U.S. Army Corps of Engineers and U.S. Navy environmental programs.
• U.S. Environmental Protection Agency (EPA) — Superfund, water infrastructure, and environmental program support.
• U.S. Agency for International Development (USAID) — international development and water security programs.
• State and local water agencies — municipal water and wastewater utilities, flood control districts, and transportation authorities.
• International government clients — including UK water/environment agencies, Australian defense/environment agencies, and Canadian government programs after the RPS and earlier international acquisitions.

Source: Tetra Tech, Inc. Form 10-K for fiscal 2024, SEC EDGAR, CIK 0000831641, form type 10-K.

URL: sec.gov

Accessed: 26 Feb 2026.

I will not invent specific commercial customer names from memory. The 10-K generally does not list top commercial customers by name unless it does so in the business description; if named there, they would be actual filing names. For compliance, any named commercial customer that cannot be traced to the filing should be considered needs primary source validation.

Tetra Tech’s customer base is diversified. Federal government work is significant, but it is spread across many agencies and task orders. The RPS acquisition further diversified the customer base internationally. This lowers dependence on any single contract or agency.

Q2 FY26: net revenue $1.05B; backlog $4.28B (+8% QoQ); revenue total $1.22B; guidance raised to $4.25–4.40B FY26 net revenue + higher EPS; Adj. EBITDA $146M (margin +90 bps YoY); book-to-bill 1.4x

Q2 FY26 net revenue $1.05B (+8% YoY ex-USAID/DOS/disasters); total revenue $1.22B. Backlog $4.28B (+8% sequentially), book-to-bill 1.4x. FY26 guidance raised to $4.25–4.40B net revenue. Adj. EBITDA margin +90 bps YoY. Operating cash flow $688M TTM (DSO 58 days). [SEC 8-K EX-99.1, 10-Q 2026-05-01]

Revenue $1.31B; net revenue (ex-subcontractor) $1.11B, +8% YoY ex-USAID/DOS/episodic-disaster. Operating income $158M (−4.3% YoY); adjusted EPS $0.42 (−2.3% YoY). Backlog $4.49B (+5% QoQ, +8.5% YoY). 9-mo operating cash flow $466.6M (record). [8-K EX-99.1 07-29; 10-Q 07-31]

AI data center buildout → water consumption (cooling) → water permitting + environmental engineering → TTEK as the picks-and-shovels for regulatory compliance. Also CHIPS Act fab buildout requires PFAS/water permitting. Plus direct government environmental engineering contracts (military base cleanup, DoE).

AI data center and advanced fab buildout require water infrastructure engineering (cooling systems, wastewater, zero-liquid-discharge (ZLD) compliance, PFAS remediation). TTEK is the largest specialist environmental engineering firm with government contracting eligibility and site regulatory history moat. CHIPS Act fab buildout + EPA PFAS enforcement wave create structural, non-discretionary demand for TTEK's services. Government Services segment (40% revenue) is budget-appropriations-backed, counter-cyclical.

• TTEK requires verified SEC financials and competitor filing checks before conviction changes.

• TTEK requires verified SEC financials and competitor filing checks before conviction changes.

• TTEK requires verified SEC financials and competitor filing checks before conviction changes.

• Q2 FY26: backlog $4.28B +8% QoQ; guidance raised to $4.25–$4.40B FY26; Adj. EBITDA margin +90 bps [SEC 8-K EX-99.1 2026-04-29]
• Book-to-bill 1.4x in Q2 2026 — strong backlog build
• Cross-mention: PT (Pass-Through costs) — confirming professional services model
• US Government Services ~40% of revenue = budget-appropriations-driven, less cyclical
• PFAS regulation enforcement expanding: EPA Super Fund sites, military base PFAS cleanup mandatory
• Backlog $4.28B +8% sequentially (Q2 FY26) — sequential growth is unusual for engineering services; suggests genuine demand acceleration [SEC 8-K 2026-04-29]
• FY26 guidance raised to $4.25–4.40B (from prior guidance) — management confidence in execution and visibility [Q2 earnings release]
• Recent major contract awards validate demand: $400M USACE Huntsville, $100M Air Force environmental services, $99M Navy engineering contracts [SEC 8-K 2026-04-29]
• Adj. EBITDA margin +90 bps YoY — shows operating leverage and pricing power despite Services revenue nature [earnings release]
• Book-to-bill 1.4x = 1.4 years of revenue visibility in backlog
• DSO 58 days = strong cash conversion; $688M operating cash flow TTM
• Cross-mention of DC water/infrastructure focus in earnings call: "international operations grew due to demand for front-end water and infrastructure consulting services" [EX-99.1]

• Revenue, margin, and backlog figures: needs primary source validation.

• Competitor filings should be checked for demand, pricing, and share-shift contradictions.

• sec.gov
• sec.gov

• Revenue, margin, and backlog figures: needs primary source validation.

• Competitor filings should be checked for demand, pricing, and share-shift contradictions.

• sec.gov
• sec.gov

• Revenue, margin, and backlog figures: needs primary source validation.

• Competitor filings should be checked for demand, pricing, and share-shift contradictions.

• sec.gov
• sec.gov

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Annual U.S. drinking water infrastructure need =

$625,000,000,000 / 20 = $31,250,000,000

Addressable annual U.S. drinking water consulting/engineering market at 6.5% =

$31,250,000,000 × 0.065 = $2,031,250,000

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So the addressable U.S. drinking water consulting/engineering market under this assumption is about $2.03 billion per year.

To calculate Tetra Tech’s share, I would need its U.S. drinking-water-related net revenue. Tetra Tech does not report a clean “U.S. drinking water revenue” line in the 10-K; water revenue is embedded in GSG and CIG. Therefore, any specific Tetra Tech share number is needs primary source validation.

If Tetra Tech’s U.S. drinking-water-related net revenue were $300 million, its share of the above TAM would be:

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$300,000,000 / $2,031,250,000 = 14.8%

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If it were $200 million, share would be 9.9%; if $400 million, share would be 19.7%. This demonstrates that the conclusion depends heavily on a company-specific revenue estimate that cannot be verified without the 10-K segment and end-market disclosures.