Company lists · Data refreshed September 2026
Top 25 Water resources engineering staffing companies based in Houston, United States
RevenueBase identified 48 water resources engineering staffing companies headquartered in Houston, United States as of September 2026 and tracks 1,618 professional contacts across them, including 299 with verified work emails. Across the United States, Houston is the largest hub for this category.
This list covers water resources engineering staffing companies headquartered in Houston, United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 29, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest water resources engineering staffing companies based in Houston, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 262 contacts → | ||||
Partial evidence “Progressive is a global staffing company connecting STEM talent with leading companies in the Power and Utilities, Renewable Energy, Oil and Gas, and Manufacturing industries.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 2 | 250 contacts → | ||||
Indirect evidence “CTS - Complete Technical Services, Inc.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 3 | 80 contacts → | ||||
Partial evidence “Based in Houston, Texas, Nearterm Corporation is one of the nation’s leading executive search, interim staffing and consulting firms with two distinct market focuses in Healthcare…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 4 | 79 contacts → | ||||
Partial evidence “Founded in 1984, OMEGA is an engineering and construction management firm specializing in infrastructure, civil engineering, highway engineering, transportation planning, railway…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 5 | 79 contacts → | ||||
Strong evidence “The objective of A&S is to provide municipal engineering services, with focus on water districts, municipalities, and land development.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 6 | 65 contacts → | ||||
Partial evidence “Civitas Engineering Group Inc.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 7 | 64 contacts → | ||||
Partial evidence “Infrastructure Consulting & Engineering, LLC (formerly IDCUS Inc.), is a leading Texas-based professional services, civil engineering, and consulting firm specializing in public…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 8 | 51 contacts → | ||||
Indirect evidence “Since 2008… JDM Group Company has been providing consulting and construction services for both public and private sector clients in a cost effective, timely, and innovative manner.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 9 | 35 contacts → | ||||
Partial evidence “Vogler & Spencer Engineering provides civil engineering consulting services to public and private clients in the Houston area and surrounding counties.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 10 | 31 contacts → | ||||
Strong evidence “Aurora Technical Services, LLC is a Houston-based civil engineering consulting firm that provides engineering expertise focused on water and wastewater pipelines.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 11 | 21 contacts → | ||||
Strong evidence “Kenall is a SB and W/M/DBE company committed to providing civil engineering, geotechnical engineering, transportation engineering, water resources planning, environmental…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 12 | 19 contacts → | ||||
Partial evidence “SIA Solutions LLC (SIA) has merged with Salas O'Brien and continues to focus on program and project-specific engineering and technical solutions in Environmental Consulting…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 13 | 14 contacts → | ||||
Strong evidence “Comal Services provides staffing support for businesses in the engineering, field operations, and skilled trades industries.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 14 | 14 contacts → | ||||
Partial evidence “Award winning Zarinkelk Engineering Services, Inc.(ZESI), established in 2001, is a Houston, Texas-based, woman-owned, consulting engineering firm.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 15 | 12 contacts → | ||||
Partial evidence “Founded in 1988, Lentz Engineering, LLC is a civil engineering and consulting firm providing services in Austin, Houston, and the surrounding cities.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 16 | 9 contacts → | ||||
Partial evidence “Krest Engineers, LLC, a multi-discipline engineering consulting firm established in 2023, is dedicated to serving both public and private sector clients in Texas through offering…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 17 | 9 contacts → | ||||
Strong evidence “In business since 1983, we provide Engineering and Technical staffing and search services across the country in both contingency and retained search capacities for most…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 18 | 8 contacts → | ||||
Partial evidence “We invest our capital to design and construct cutting edge water supply systems that substantially reduce our clients’ costs by delivering low-cost alternative water instead of…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 19 | 8 contacts → | ||||
Partial evidence “Sandlot Engineering, LLC is a boutique civil engineering firm with passionate and proactive team members that want to make the world a better place through sustainable design of…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 20 | 7 contacts → | ||||
Partial evidence “Established in 1971, Sander Engineering Corporation (“SEC”) is a well-established, full service civil engineering design firm based in Houston.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 21 | 6 contacts → | ||||
Strong evidence “Diaz Engineering, LLC is a woman-owned civil engineering firm based in Houston, Texas, specializing in water resources and flood risk management.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 22 | 5 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 23 | 3 contacts → | ||||
Strong evidence “Rayne Engineering+Skilled Trades is The Engineering & Skilled Trades Technical Staffing and Recruiting firm.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 24 | 2 contacts → | ||||
Indirect evidence “We are Recruiting Experts.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 25 | 2 contacts → | ||||
Indirect evidence “InPipe Consultants, LLC is a Limited Liability Company, located in Houston, Texas.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: water resources engineering staffing companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names water resources engineering staffing companies.
- Partial evidence
- Its own public description names part of water resources engineering staffing companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name water resources engineering staffing companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 48 water resources engineering staffing companies based in Houston, United States
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Water resources engineering staffing companies based in Houston, United States at a glance
As of Sep 29, 2026Companies by employee count
Email recency for this list is measured across the whole United States list rather than for Houston, so it is reported there. Company counts and contact totals on this page are exact for Houston, over 48 companies.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among water resources engineering staffing companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in Houston, United States whose own description of what they do matches “water resources engineering staffing companies”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names water resources engineering staffing companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among water resources engineering staffing companies, and records with no verified work email. Companies headquartered outside Houston are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 299 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 29, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names water resources engineering staffing companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many water resources engineering staffing companies are there based in Houston, United States?
RevenueBase identified 48 water resources engineering staffing companies headquartered in Houston, United States as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Progressive, headquartered in Houston, tops this list with the largest team on record.
Which city in the United States has the most water resources engineering staffing companies?
Houston leads the United States with 48 headquartered companies, followed by Austin (24) and Portland (19).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 299 verified decision-maker contacts tracked across these 48 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 29, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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