Company lists · Data refreshed September 2026

Top 25 Water quality consultants based in the United States

Name: Water quality consultants based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 1,251 companies tracked

RevenueBase identified 1,251 water quality consultants headquartered in the United States as of September 2026 and tracks 19,809 professional contacts across them, including 8,847 with verified work emails. Houston is the largest hub.

This list covers water quality consultants headquartered in the 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 22, 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 22, 2026 86% judged on-target in blind review

1,251Companies

19,809Contacts tracked

8,847Verified emails

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The 25 largest water quality consultants based in the United States

Ranked by team size

Top 25 of 1,251 water quality consultants based in the United States, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to water quality consultants: 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	Hazen And Sawyer	Indirect evidence	New York, NY, United StatesHQ checked Sep 22, 2026	1,001-5,000	2,100 contacts →
	Indirect evidence “As Hazen marks 75 years, we celebrate a legacy of absolute commitment to our clients while delivering the best technical work available anywhere.” Source: RevenueBase Database · checked Sep 22, 2026
2	Chem-Aqua, INC	Indirect evidence	Wilmington, DE, United StatesHQ checked Sep 22, 2026	10001+	864 contacts →
	Indirect evidence “Chem-Aqua is a unique combination of knowledge, experience and stability.” Source: RevenueBase Database · checked Sep 22, 2026
3	Trihydro Corporation	Strong evidence	Laramie, WY, United StatesHQ checked Sep 22, 2026	501-1,000	577 contacts →
	Strong evidence “Headquartered in Laramie, Wyoming, Trihydro provides environmental consulting, engineering and surveying, air quality and process management, information technology, and water and…” Source: RevenueBase Database · checked Sep 22, 2026
4	Westech Engineering	Partial evidence	Salt Lake City, UT, United StatesHQ checked Sep 22, 2026	501-1,000	554 contacts →
	Partial evidence “WesTech Engineering, LLC designs, engineers, and manufactures water and wastewater treatment process equipment for mineral, industrial, and municipal applications worldwide.” Source: RevenueBase Database · checked Sep 22, 2026
5	Ae2s Advanced Engineering And Environmental Services, LLC	Indirect evidence	Grand Forks, ND, United StatesHQ checked Sep 22, 2026	201-500	339 contacts →
	Indirect evidence “AE2S is a specialized civil/environmental consulting engineering firm that provides professional services and our unique brand of extreme client service to clients in the upper…” Source: RevenueBase Database · checked Sep 22, 2026
6	Parkson Corporation	Partial evidence	Fort Lauderdale, FL, United StatesHQ checked Sep 22, 2026	51-200	317 contacts →
	Partial evidence “Parkson Corporation is a supplier of innovative, cost effective solutions for potable water, process water, and industrial and municipal wastewater treatment.” Source: RevenueBase Database · checked Sep 22, 2026
7	Water Environment Federation	Strong evidence	Alexandria, VA, United StatesHQ checked Sep 22, 2026	51-200	279 contacts →
	Strong evidence “Formed in 1928, the Water Environment Federation® (WEF®) and its global network of Member Associations help provide water quality professionals with the latest in water quality…” Source: RevenueBase Database · checked Sep 22, 2026
8	Culligan By Waterco	Partial evidence	Lombard, IL, United StatesHQ checked Sep 22, 2026	501-1,000	265 contacts →
	Partial evidence “Culligan has over 80 years of experience in the design and distribution of water treatment systems for residential, commercial and industrial applications.” Source: RevenueBase Database · checked Sep 22, 2026
9	Aqua-Aerobic Systems, INC	Indirect evidence	Loves Park, IL, United StatesHQ checked Sep 22, 2026	51-200	207 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 22, 2026
10	Phigenics	Partial evidence	Warrenville, IL, United StatesHQ checked Sep 22, 2026	51-200	197 contacts →
	Partial evidence “Phigenics is a leading provider of safe, smart, and superior water management programs aligned with ANSI/ASHRAE Standard 188 and Centers for Medicare & Medicaid Services (CMS) QSO…” Source: RevenueBase Database · checked Sep 22, 2026
11	Newterra	Partial evidence	Coraopolis, PA, United StatesHQ checked Sep 22, 2026	201-500	185 contacts →
	Partial evidence “Newterra designs, engineers, manufactures, and services environmental, water and wastewater treatment solutions that assure great performance, superb reliability, and the highest…” Source: RevenueBase Database · checked Sep 22, 2026
12	Herrera Environmental Consultants	Strong evidence	Seattle, WA, United StatesHQ checked Sep 22, 2026	51-200	176 contacts →
	Strong evidence “Herrera Environmental Consultants is a leading engineering and scientific consulting firm focused on restoration, water, and sustainable development.” Source: RevenueBase Database · checked Sep 22, 2026
13	Smith & Loveless INC	Indirect evidence	Lenexa, KS, United StatesHQ checked Sep 22, 2026	201-500	172 contacts →
	Indirect evidence “S&L delivers long-lasting, reliable and easy-to-operate wastewater pumping and treatment systems for municipal, federal, and industrial-commercial applications.” Source: RevenueBase Database · checked Sep 22, 2026
14	Aqualis	Partial evidence	Morrisville, NC, United StatesHQ checked Sep 22, 2026	501-1,000	136 contacts →
	Partial evidence “AQUALIS is the national leader in water management, compliance and engineering, helping businesses meet complex water regulations while protecting long-term infrastructure.” Source: RevenueBase Database · checked Sep 22, 2026
15	Aquaphoenix Scientific	Strong evidence	Hanover, PA, United StatesHQ checked Sep 22, 2026	51-200	134 contacts →
	Strong evidence “AquaPhoenix is a custom manufacturer offering innovative products and services for industrial water quality testing and chemical feed and control.” Source: RevenueBase Database · checked Sep 22, 2026
16	Ensero Solutions	Partial evidence	Fort Collins, CO, United StatesHQ checked Sep 22, 2026	51-200	129 contacts →
	Partial evidence “Ensero Solutions is an environmental consulting and remediation business with specific expertise in environmental assessments and permitting solutions, mine water management…” Source: RevenueBase Database · checked Sep 22, 2026
17	CMS Environmental Solutions	Partial evidence	Greenwood Village, CO, United StatesHQ checked Sep 22, 2026	51-200	126 contacts →
	Partial evidence “CMS Environmental Solutions is a stormwater compliance consultant providing NOI permitting, development, dewatering planning, site inspections, and custom stormwater management…” Source: RevenueBase Database · checked Sep 22, 2026
18	Montgomery & Associates	Partial evidence	Tucson, AZ, United StatesHQ checked Sep 22, 2026	51-200	126 contacts →
	Partial evidence “M&A is a water resource consulting firm that partners with clients to address their evolving water resource challenges.” Source: RevenueBase Database · checked Sep 22, 2026
19	NCE Engineering & Environmental Services	Indirect evidence	Reno, NV, United StatesHQ checked Sep 22, 2026	51-200	122 contacts →
	Indirect evidence “NCE's experience is as extensive as the need for answers to the complex issues challenging designers and policy makers of the future.” Source: RevenueBase Database · checked Sep 22, 2026
20	Avantech, LLC	Partial evidence	Columbia, SC, United StatesHQ checked Sep 22, 2026	51-200	117 contacts →
	Partial evidence “AVANTech, LLC is a comprehensive industrial water treatment solutions provider.” Source: RevenueBase Database · checked Sep 22, 2026
21	HOH Water Technology, INC	Partial evidence	Palatine, IL, United StatesHQ checked Sep 22, 2026	51-200	110 contacts →
	Partial evidence “HOH is a leading water treatment chemical and service company, working to establish the new water technology standard at over facilities across the United States.” Source: RevenueBase Database · checked Sep 22, 2026
22	Skelly And Loy, Inc., A Terracon Company	Indirect evidence	Harrisburg, PA, United StatesHQ checked Sep 22, 2026	51-200	108 contacts →
	Indirect evidence “Established in 1969, Skelly and Loy is a privately owned, mid-sized corporation with 6 Mid-Atlantic offices.” Source: RevenueBase Database · checked Sep 22, 2026
23	Broadbent & Associates, INC	Partial evidence	Henderson, NV, United StatesHQ checked Sep 22, 2026	51-200	106 contacts →
	Partial evidence “Broadbent & Associates, Inc.(Broadbent) is an established environmental, water resources, and civil engineering firm.” Source: RevenueBase Database · checked Sep 22, 2026
24	Jones & Henry Engineers	Strong evidence	Toledo, OH, United StatesHQ checked Sep 22, 2026	51-200	101 contacts →
	Strong evidence “Today, Jones & Henry Engineers, Ltd, continues to provide high quality consulting services in water, wastewater, storm water, and civil engineering to municipalities and…” Source: RevenueBase Database · checked Sep 22, 2026
25	CK Associates Environmental Consultants	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 22, 2026	51-200	101 contacts →
	Indirect evidence “CK Associates is an environmental consulting firm that is fully owned by its employees.” Source: RevenueBase Database · checked Sep 22, 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 quality consultants. 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 quality consultants.
Partial evidence: Its own public description names part of water quality consultants, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name water quality consultants. 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 1,251 water quality consultants based in the United States

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Water quality consultants based in the United States at a glance

As of Sep 22, 2026

44.7%Verified-email coverage

15.8Average contacts per company

1-10Median size (employees)

1.8%Largest-city concentration · Houston

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

625

11-50

436

51-200

145

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 1,251 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 quality consultants, 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 the United States whose own description of what they do matches “water quality consultants”. 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 quality consultants), 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 quality consultants, and records with no verified work email. Companies headquartered outside United States 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, 8,847 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 22, 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 quality consultants, 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 quality consultants are there based in the United States?

RevenueBase identified 1,251 water quality consultants headquartered in the 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?

Hazen And Sawyer, headquartered in New York, tops this list with the largest team on record.

Which city has the most water quality consultants?

Houston leads with 22 headquartered companies, followed by Tampa (12) and Indianapolis (11).

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 8,847 verified decision-maker contacts tracked across these 1,251 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 22, 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.