Company lists · Data refreshed September 2026

Top 25 Water infrastructure consulting firms based in Houston, United States

Name: Water infrastructure consulting firms based in Houston, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 123 companies tracked

RevenueBase identified 123 water infrastructure consulting firms headquartered in Houston, United States as of September 2026 and tracks 10,741 professional contacts across them, including 4,254 with verified work emails. Across the United States, Houston is the largest hub for this category.

This list covers water infrastructure consulting firms 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 29, 2026 86% judged on-target in blind review

123Companies

10,741Contacts tracked

4,254Verified emails

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The 25 largest water infrastructure consulting firms based in Houston, United States

Ranked by team size

Top 25 of 123 water infrastructure consulting firms based in Houston, United States, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to water infrastructure consulting firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	LJA	Indirect evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,932 contacts →
	Indirect evidence “Employee-Owned.” Source: RevenueBase Database · checked Sep 29, 2026
2	Bge, INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,112 contacts →
	Indirect evidence “Ranked No.” Source: RevenueBase Database · checked Sep 29, 2026
3	Quiddity	Strong evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	501-1,000	683 contacts →
	Strong evidence “Quiddity is an award-winning, full-service civil engineering, planning, surveying, and consulting firm providing innovative solutions for public infrastructure and private…” Source: RevenueBase Database · checked Sep 29, 2026
4	Cobb, Fendley & Associates, INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	501-1,000	524 contacts →
	Partial evidence “Cobb, Fendley & Associates, Inc.(CobbFendley) is a nationally recognized infrastructure solutions firm with a regional focus and a commitment to excellence.” Source: RevenueBase Database · checked Sep 29, 2026
5	Rockwater Energy Solutions	Indirect evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	201-500	519 contacts →
	Indirect evidence “Rockwater is now Select Chemistry.” Source: RevenueBase Database · checked Sep 29, 2026
6	Lockwood, Andrews & Newnam, Inc. LAN	Partial evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	201-500	461 contacts →
	Partial evidence “Lockwood, Andrews & Newnam, Inc.(LAN) is a full-service consulting firm offering planning, engineering and program management services.” Source: RevenueBase Database · checked Sep 29, 2026
7	GSI Environmental INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	201-500	259 contacts →
	Partial evidence “GSI Environmental, Inc.(GSI), is an environmental engineering and science consulting firm committed to measuring, analyzing, and solving complex environmental problems around the…” Source: RevenueBase Database · checked Sep 29, 2026
8	Office Of The County Engineer	Indirect evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	501-1,000	248 contacts →
	Indirect evidence “Office of the County Engineer is a regional leader in providing wholly integrated professional services to a broad range of clients.” Source: RevenueBase Database · checked Sep 29, 2026
9	HVJ Associates	Partial evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	51-200	199 contacts →
	Partial evidence “Completing public infrastructure projects comes with tremendous pressure to serve the public while completing each project on-time and on-budget.” Source: RevenueBase Database · checked Sep 29, 2026
10	IDS Engineering Group	Partial evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	51-200	182 contacts →
	Partial evidence “Founded in 1970, IDS Engineering Group is a Houston-based civil engineering and surveying firm with over five decades of experience delivering infrastructure solutions for public…” Source: RevenueBase Database · checked Sep 29, 2026
11	Dec, NOW GFT	Indirect evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	1,001-5,000	128 contacts →
	Indirect evidence “Gannett Fleming is a privately held AEC firm partnering closely with our clients on some of the toughest challenges facing our communities today-and into the future.” Source: RevenueBase Database · checked Sep 29, 2026
12	DCCM	Strong evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	501-1,000	123 contacts →
	Strong evidence “DCCM provides design, consulting, and construction management services focused on infrastructure markets across the United States.” Source: RevenueBase Database · checked Sep 29, 2026
13	S&b Infrastructure, LTD	Partial evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	51-200	97 contacts →
	Partial evidence “S&B Infrastructure, Ltd.(S & BI) has been in existence since 1994 as part of S&B Holdings, Ltd,(one of the largest privately-owned engineering firms in the State of Texas).” Source: RevenueBase Database · checked Sep 29, 2026
14	Omega Engineers, INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	51-200	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, 2026
15	A&s Engineers, INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	51-200	79 contacts →
	Partial 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, 2026
16	Sowells Consulting Engineers SCE	Partial evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	11-50	66 contacts →
	Partial evidence “Sowells Consulting Engineers (SCE), established in 2010, is a professional services consulting firm specializing in leading project teams and providing quality control during the…” Source: RevenueBase Database · checked Sep 29, 2026
17	Civitas Engineering Group, INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	51-200	65 contacts →
	Indirect evidence “Civitas Engineering Group Inc.” Source: RevenueBase Database · checked Sep 29, 2026
18	Idcus INC	Strong evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	51-200	64 contacts →
	Strong 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, 2026
19	AUC Group	Partial evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	51-200	56 contacts →
	Partial evidence “Founded in 1970 and based in Houston, Texas, AUC Group has redefined water and wastewater treatment with unmatched flexibility in project timelines, financing, equipment, and…” Source: RevenueBase Database · checked Sep 29, 2026
20	Decon LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	11-50	55 contacts →
	Partial evidence “MBE \| SBE \| DBE \| HUB \| HHF, TBPE Firm No 16156 DECON LLC,founded by Fulvio Jaramillo, a consulting engineering firm committed to technical excellence, DECON’s services help…” Source: RevenueBase Database · checked Sep 29, 2026
21	JDM Group Company, LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	51-200	51 contacts →
	Partial 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, 2026
22	Rava Construction LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	51-200	47 contacts →
	Partial evidence “RAVA is a Houston, TX based construction and consulting firm specializing in construction projects including commercial buildings and waterworks facilities.” Source: RevenueBase Database · checked Sep 29, 2026
23	Blackline Engineering, LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	11-50	46 contacts →
	Partial evidence “Blackline Engineering, LLC is a Houston based engineering consulting firm that offers innovative design and project management services that are tailored for each client.” Source: RevenueBase Database · checked Sep 29, 2026
24	RPT Alliance LLC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	11-50	43 contacts →
	Indirect evidence “As of December 8, 2025, RTP Alliance has been acquired by by Bowman.” Source: RevenueBase Database · checked Sep 29, 2026
25	Vogler & Spencer Engineering, INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	11-50	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, 2026

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 infrastructure consulting firms. 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 infrastructure consulting firms.
Partial evidence: Its own public description names part of water infrastructure consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name water infrastructure consulting firms. 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 123 water infrastructure consulting firms based in Houston, United States

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Water infrastructure consulting firms based in Houston, United States at a glance

As of Sep 29, 2026

39.6%Verified-email coverage

87.3Average contacts per company

11-50Median size (employees)

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

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 123 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 infrastructure consulting firms, 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 infrastructure consulting firms”. 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 infrastructure consulting firms), 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 infrastructure consulting firms, 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, 4,254 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.

Water infrastructure consulting firms by metro in the United States

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 infrastructure consulting firms, 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 infrastructure consulting firms are there based in Houston, United States?

RevenueBase identified 123 water infrastructure consulting firms 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?

LJA, headquartered in Houston, tops this list with the largest team on record.

Which city in the United States has the most water infrastructure consulting firms?

Houston leads the United States with 123 headquartered companies, followed by New York (51) and Austin (49).

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 4,254 verified decision-maker contacts tracked across these 123 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.