Company lists · Data refreshed September 2026

Top 25 Wetland management consultants based in the United States

RevenueBase identified 628 wetland management consultants headquartered in the United States as of September 2026 and tracks 8,749 professional contacts across them, including 4,610 with verified work emails. Seattle is the largest hub.

This list covers wetland management 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 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
628Companies
8,749Contacts tracked
4,610Verified emails
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The 25 largest wetland management consultants based in the United States

Ranked by team size
Top 25 of 628 wetland management consultants based in the United States, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to wetland management 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Indirect evidenceSeattle, WA, United StatesHQ checked Sep 29, 2026501-1,000880 contacts →

Indirect evidence

“At Parametrix, we help our clients imagine what's possible.”

Source: RevenueBase Database · checked Sep 29, 2026
2Indirect evidenceSan Francisco, CA, United StatesHQ checked Sep 29, 2026501-1,000732 contacts →

Indirect evidence

“ESA is a 100% employee-owned environmental consulting firm.”

Source: RevenueBase Database · checked Sep 29, 2026
3Partial evidenceGainesville, FL, United StatesHQ checked Sep 29, 2026201-500305 contacts →

Partial evidence

“Environmental Consulting & Technology, Inc.(ECT) is a multi-disciplinary environmental and sustainability consulting firm delivering strategy, permitting, design, and management…”

Source: RevenueBase Database · checked Sep 29, 2026
4Indirect evidenceBedford, NH, United StatesHQ checked Sep 29, 2026201-500189 contacts →

Indirect evidence

Source: RevenueBase Database · checked Sep 29, 2026
5Partial evidenceSan Rafael, CA, United StatesHQ checked Sep 29, 202651-200183 contacts →

Partial evidence

“WRA is an environmental consultancy that’s making a net positive impact.”

Source: RevenueBase Database · checked Sep 29, 2026
6Partial evidenceSeattle, WA, United StatesHQ checked Sep 29, 202651-200176 contacts →

Partial evidence

“Herrera Environmental Consultants is a leading engineering and scientific consulting firm focused on restoration, water, and sustainable development.”

Source: RevenueBase Database · checked Sep 29, 2026
7Partial evidenceMorrisville, NC, United StatesHQ checked Sep 29, 2026501-1,000136 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 29, 2026
8Indirect evidenceBerkeley, CA, United StatesHQ checked Sep 29, 202651-200115 contacts →

Indirect evidence

“Stillwater Sciences is committed to creating a better world through science.”

Source: RevenueBase Database · checked Sep 29, 2026
9Indirect evidenceSeattle, WA, United StatesHQ checked Sep 29, 202651-200110 contacts →

Indirect evidence

“Cascadia Consulting Group is a majority women-owned consulting firm specializing in environmental and sustainability solutions.”

Source: RevenueBase Database · checked Sep 29, 2026
10Partial evidenceChantilly, VA, United StatesHQ checked Sep 29, 2026201-500104 contacts →

Partial evidence

“Established in 1983, TechLaw provides environmental and management consulting services to the public sector nationwide.”

Source: RevenueBase Database · checked Sep 29, 2026
11Indirect evidenceMillersville, MD, United StatesHQ checked Sep 29, 2026201-500101 contacts →

Indirect evidence

“Our mission is to be the keystone species in the restoration of the Chesapeake Bay.”

Source: RevenueBase Database · checked Sep 29, 2026
12Indirect evidenceMechanicsville, VA, United StatesHQ checked Sep 29, 202611-50101 contacts →

Indirect evidence

“Consulting, Inc.(3e) is a dynamic and progressive certified small business that specializes in environmental studies, environmental engineering, environmental education, and…”

Source: RevenueBase Database · checked Sep 29, 2026
13Indirect evidenceDenver, CO, United StatesHQ checked Sep 29, 202651-20094 contacts →

Indirect evidence

“LRE Water is now Spheros Environmental.”

Source: RevenueBase Database · checked Sep 29, 2026
14Indirect evidenceCincinnati, OH, United StatesHQ checked Sep 29, 202651-20091 contacts →

Indirect evidence

“Environmental Solutions & Innovations, Inc.(ESI) is an employee-owned company providing clients with a one-stop shop for cultural and natural resource services, civil engineering…”

Source: RevenueBase Database · checked Sep 29, 2026
15Indirect evidenceGainesville, FL, United StatesHQ checked Sep 29, 202611-5087 contacts →

Indirect evidence

“Water and Air Research, Inc.”

Source: RevenueBase Database · checked Sep 29, 2026
16Indirect evidenceDavis, CA, United StatesHQ checked Sep 29, 202651-20079 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 29, 2026
17Indirect evidenceTrenton, NJ, United StatesHQ checked Sep 29, 202651-20071 contacts →

Indirect evidence

“Experience, Expertise and Excellence in Water Resources, Ecology, and Geotechnical Engineering.”

Source: RevenueBase Database · checked Sep 29, 2026
18Indirect evidenceJacksonville, FL, United StatesHQ checked Sep 29, 202651-20070 contacts →

Indirect evidence

“Environmental Services, Inc.(ESI) is a leading full service environmental consulting firm with national and international experience.”

Source: RevenueBase Database · checked Sep 29, 2026
19Indirect evidenceLos Gatos, CA, United StatesHQ checked Sep 29, 202651-20069 contacts →

Indirect evidence

“Since 1970, the highly-trained ecologists and professionals at H.”

Source: RevenueBase Database · checked Sep 29, 2026
20Indirect evidenceBaltimore, MD, United StatesHQ checked Sep 29, 202651-20069 contacts →

Indirect evidence

“We do environmental work.”

Source: RevenueBase Database · checked Sep 29, 2026
21Partial evidenceLakewood, CO, United StatesHQ checked Sep 29, 202611-5067 contacts →

Partial evidence

“We are a team of consultants who specialize in natural resource and environmental assessment, planning, and permitting.”

Source: RevenueBase Database · checked Sep 29, 2026
22Indirect evidenceSt. Paul, MN, United StatesHQ checked Sep 29, 202651-20065 contacts →

Indirect evidence

“EOR is a collaborative group of environmental and design professionals passionate about protecting our waters, restoring healthy ecosystems, and enhancing our community's unique…”

Source: RevenueBase Database · checked Sep 29, 2026
23Indirect evidenceDenver, CO, United StatesHQ checked Sep 29, 202611-5065 contacts →

Indirect evidence

“Wright Water Engineers, Inc.(WWE) is a water resources consulting engineering firm that was founded in 1961.”

Source: RevenueBase Database · checked Sep 29, 2026
24Indirect evidenceBend, OR, United StatesHQ checked Sep 29, 202651-20065 contacts →

Indirect evidence

“SummitWest is an environmental consulting company that is home to a team of dynamic, solution-oriented thinkers.”

Source: RevenueBase Database · checked Sep 29, 2026
25Indirect evidenceWalnut Creek, CA, United StatesHQ checked Sep 29, 202611-5059 contacts →

Indirect evidence

“Founded in 2011, Sequoia is a California-based, woman-owned, small, and disadvantaged business (WBE | SBE | DBE) that provides environmental consulting services to public agencies…”

Source: RevenueBase Database · checked Sep 29, 2026

Showing 25 of 628 wetland management consultants based in the United States

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Wetland management consultants based in the United States at a glance

As of Sep 29, 2026
52.7%Verified-email coverage
13.9Average contacts per company
1-10Median size (employees)
1.6%Largest-city concentration · Seattle
Sep 29, 2026Page data refreshed

Companies by employee count

1-10
394
11-50
185
51-200
40
201-500
5
501-1,000
3

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 628 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 wetland management 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 “wetland management 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 wetland management 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 wetland management 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, 4,610 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 wetland management 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 wetland management consultants are there based in the United States?

RevenueBase identified 628 wetland management 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?

Parametrix, headquartered in Seattle, tops this list with the largest team on record.

Which city has the most wetland management consultants?

Seattle leads with 10 headquartered companies, followed by Portland (8) and Gainesville (7).

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 4,610 verified decision-maker contacts tracked across these 628 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.