Company lists · Data refreshed September 2026

Top 25 Water efficiency consultants based in the United States

Name: Water efficiency 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 390 companies tracked

RevenueBase identified 390 water efficiency consultants headquartered in the United States as of September 2026 and tracks 5,941 professional contacts across them, including 3,260 with verified work emails. Denver is the largest hub.

This list covers water efficiency 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

390Companies

5,941Contacts tracked

3,260Verified emails

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The 25 largest water efficiency consultants based in the United States

Ranked by team size

Top 25 of 390 water efficiency 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 efficiency 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	P2s	Indirect evidence	Long Beach, CA, United StatesHQ checked Sep 22, 2026	201-500	375 contacts →
	Indirect evidence “P2S has brought forward-thinking, sustainable engineering solutions to California, the Pacific Northwest, and beyond, for over 30 years.” Source: RevenueBase Database · checked Sep 22, 2026
3	Chemsearch FE	Partial evidence	Irving, TX, United StatesHQ checked Sep 22, 2026	1,001-5,000	251 contacts →
	Partial evidence “Chemsearch FE’s mission is simple-to help facilities save water, energy and reduce operating costs.” Source: RevenueBase Database · checked Sep 22, 2026
4	PEG	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 22, 2026	201-500	214 contacts →
	Indirect evidence “PEG presents a comprehensive capacity for the evaluation and understanding of a broad base of energy and environmental sustainability related programs, policies and initiatives.” Source: RevenueBase Database · checked Sep 22, 2026
5	Apex Water And Process	Partial evidence	St Michael, MN, United StatesHQ checked Sep 22, 2026	201-500	143 contacts →
	Partial evidence “Apex, a trusted leader in water and process management, delivers integrated solutions that empower agricultural, commercial, and industrial customers across the U.S.” Source: RevenueBase Database · checked Sep 22, 2026
6	Michaels Energy- An Inc. 5000 Company	Indirect evidence	La Crosse, WI, United StatesHQ checked Sep 22, 2026	51-200	121 contacts →
	Indirect evidence “Michaels Energy is a veteran-owned energy consulting firm that exists to help businesses minimize waste and maximize value.” Source: RevenueBase Database · checked Sep 22, 2026
7	KW Engineering	Partial evidence	Oakland, CA, United StatesHQ checked Sep 22, 2026	51-200	97 contacts →
	Partial evidence “In 1998, I started kW Engineering as a two-person firm with a singular vision: to become the leading technical experts at saving money in buildings by saving energy and water.” Source: RevenueBase Database · checked Sep 22, 2026
8	LRE Water A Spheros Environmental Company	Partial evidence	Denver, CO, United StatesHQ checked Sep 22, 2026	51-200	94 contacts →
	Partial evidence “LRE Water is now Spheros Environmental.” Source: RevenueBase Database · checked Sep 22, 2026
9	Niagara Conservation	Partial evidence	Flower Mound, TX, United StatesHQ checked Sep 22, 2026	51-200	81 contacts →
	Partial evidence “Founded by Bill Cutler in 1974, Niagara Conservation Corporation is a privately-held, leading manufacturer of water- and energy-conservation products & services.” Source: RevenueBase Database · checked Sep 22, 2026
10	Larry Walker Associates	Indirect evidence	Davis, CA, United StatesHQ checked Sep 22, 2026	51-200	79 contacts →
	Indirect evidence “Larry Walker Associates (LWA) is a privately owned firm headquartered in Davis, California, with offices in Berkeley, Yreka, Santa Monica, Ventura, San Diego, and Seattle, WA.” Source: RevenueBase Database · checked Sep 22, 2026
11	Spectrum	Strong evidence	Geismar, LA, United StatesHQ checked Sep 22, 2026	51-200	69 contacts →
	Strong evidence “At Spectrum, our mission is simple: to provide smarter, more efficient, and sustainable water solutions.” Source: RevenueBase Database · checked Sep 22, 2026
12	Homeyer Consulting Services, INC	Indirect evidence	Tewksbury, MA, United StatesHQ checked Sep 22, 2026	11-50	66 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 22, 2026
13	Kemco Systems	Partial evidence	Clearwater, FL, United StatesHQ checked Sep 22, 2026	51-200	55 contacts →
	Partial evidence “Kemco Systems, a CECO Environmental Brand, designs and manufactures energy and water conservation systems for Water Reuse/Recycle, Wastewater Treatment, Wastewater Filtration…” Source: RevenueBase Database · checked Sep 22, 2026
14	NCS Engineers	Partial evidence	Phoenix, AZ, United StatesHQ checked Sep 22, 2026	51-200	47 contacts →
	Partial evidence “NCS is an experienced water and wastewater engineering consulting firm with offices in Arizona, Maryland, Nevada, New Mexico and California.” Source: RevenueBase Database · checked Sep 22, 2026
15	Commercial Green Solutions	Partial evidence	Charlotte, NC, United StatesHQ checked Sep 22, 2026	51-200	43 contacts →
	Partial evidence “Commercial Green Solutions** is a long-established and respected Energy Consultant dedicated to helping clients: Dramatically reduce energy usage Lower energy spend Improve…” Source: RevenueBase Database · checked Sep 22, 2026
16	GKY	Partial evidence	Chantilly, VA, United StatesHQ checked Sep 22, 2026	11-50	37 contacts →
	Partial evidence “GKY is one of Virginia’s largest consulting groups dedicated to water resources and environmental sciences.” Source: RevenueBase Database · checked Sep 22, 2026
17	MLJ Environmental	Indirect evidence	Sacramento, CA, United StatesHQ checked Sep 22, 2026	11-50	35 contacts →
	Indirect evidence “Our solutions are tailored to every client because we have the experience to identify unique opportunities in every ecosystem we study.” Source: RevenueBase Database · checked Sep 22, 2026
18	PG Environmental	Indirect evidence	Golden, CO, United StatesHQ checked Sep 22, 2026	11-50	35 contacts →
	Indirect evidence “PG Environmental (PG) is an environmental consulting firm offering specialized technical expertise to federal and state agencies tasked with protecting and restoring our nation’s…” Source: RevenueBase Database · checked Sep 22, 2026
19	Nv5 NET Zero	Strong evidence	Hollywood, FL, United StatesHQ checked Sep 22, 2026	11-50	34 contacts →
	Strong evidence “NV5 Net Zero is a leading global energy efficiency consultancy.” Source: RevenueBase Database · checked Sep 22, 2026
20	Water Management INC	Strong evidence	Alexandria, VA, United StatesHQ checked Sep 22, 2026	11-50	33 contacts →
	Strong evidence “Water Management, Inc.(WMI) is well established in the field of water efficiency and conservation and has developed a successful track record since its founding in 1980.” Source: RevenueBase Database · checked Sep 22, 2026
21	Waterwise Consulting, INC	Indirect evidence	Glendora, CA, United StatesHQ checked Sep 22, 2026	11-50	33 contacts →
	Indirect evidence “Conserving our Natural Resources for Future Generations." WaterWise Consulting Inc.” Source: RevenueBase Database · checked Sep 22, 2026
22	Ecotope, INC	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 22, 2026	11-50	30 contacts →
	Indirect evidence “Ecotope has provided sustainable building design consulting and engineering services in the Pacific Northwest for over 40 years.” Source: RevenueBase Database · checked Sep 22, 2026
23	SBW Consulting, INC	Strong evidence	Bellevue, WA, United StatesHQ checked Sep 22, 2026	11-50	29 contacts →
	Strong evidence “SBW Consulting, Inc.(SBW) is a leader in energy and water efficiency.” Source: RevenueBase Database · checked Sep 22, 2026
24	Davids Engineering, INC	Indirect evidence	Davis, CA, United StatesHQ checked Sep 22, 2026	11-50	28 contacts →
	Indirect evidence “Since 1993, Davids Engineering, Inc.” Source: RevenueBase Database · checked Sep 22, 2026
25	Stetson Engineers INC	Indirect evidence	San Rafael, CA, United StatesHQ checked Sep 22, 2026	51-200	27 contacts →
	Indirect evidence “Stetson Engineers is an environmental consulting firm which works with Department of Justice, Department of Defense, Department of Interior, Tribal, private, municipal, county…” 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 efficiency 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 efficiency consultants.
Partial evidence: Its own public description names part of water efficiency consultants, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name water efficiency 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 390 water efficiency consultants based in the United States

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Water efficiency consultants based in the United States at a glance

As of Sep 22, 2026

54.9%Verified-email coverage

15.2Average contacts per company

1-10Median size (employees)

2.1%Largest-city concentration · Denver

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

261

11-50

51-200

201-500

1,001-5,000

5,001-10,000

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 390 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 efficiency 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 efficiency 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 efficiency 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 efficiency 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, 3,260 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 efficiency 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 efficiency consultants are there based in the United States?

RevenueBase identified 390 water efficiency 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 efficiency consultants?

Denver leads with 8 headquartered companies, followed by Austin (6) and Los Angeles (6).

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 3,260 verified decision-maker contacts tracked across these 390 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.