Company lists · Data refreshed October 2026

Top 24 Conservation engineering firms based in Washington, United States

Name: Conservation engineering firms based in Washington, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 10, 2026 40 companies tracked

RevenueBase identified 40 company matches for conservation engineering firms associated with Washington, United States as of October 2026 and tracks 418 professional contacts across them, including 228 with verified work emails. Across the United States, Houston is the largest hub for this category (132 companies); Washington has 40.

This list covers company matches for conservation engineering firms associated with Washington, United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed October 10, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Oct 10, 2026 How this list was built

40Companies

418Contacts tracked

228Verified emails

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The 24 largest conservation engineering firms based in Washington, United States

Ranked by team size

Top 24 of 40 company matches for conservation engineering firms based in Washington, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 10, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Delon Hampton & Associates, Chartered	Exact match	Washington, DC, United StatesHQ recorded Oct 10, 2026	51-200	74 contacts →
	Exact match “Delon Hampton & Associates, Chartered (DHA), is a professional consulting engineering firm specializing in civil and structural engineering, as well as program and construction…” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
2	Peer Consultants, P.C	Exact match	Washington, DC, United StatesHQ recorded Oct 10, 2026	51-200	72 contacts →
	Exact match “In 1978, PEER was established under Dr.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
3	Northbridge	Exact match	Washington, United StatesHQ recorded Oct 10, 2026	11-50	25 contacts →
	Exact match “At Northbridge, we provide our clients with the tools and expertise to help solve complex financial, policy, and environmental challenges.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
4	SZ PM Consultants, INC	Exact match	Washington, DC, United StatesHQ recorded Oct 10, 2026	11-50	24 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
5	Foxxstem	Exact match	Washington, DC, United StatesHQ recorded Oct 10, 2026	11-50	23 contacts →
	Exact match “FOXXSTEM is a professional engineering consulting firm that inspires and creates infrastructure that connects people to communities and communities to opportunities for better…” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
6	North Arrow, INC	Exact match	Washington, DC, United StatesHQ recorded Oct 10, 2026	11-50	23 contacts →
	Exact match “DUNS Number: 08-001-8268 CAGE Code: 7GN69 SBA Certified Small Business District of Columbia Certified Business Enterprise (CBE) Metropolitan Washington Airports Authority Local…” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
7	Interagency INC	Exact match	Washington, DC, United StatesHQ recorded Oct 10, 2026	11-50	20 contacts →
	Exact match “InterAgency provides preconstruction consulting for the Washington Metro Area’s most complex and challenging infrastructure projects.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
8	Bradley Site Design, INC	Exact match	Washington, DC, United StatesHQ recorded Oct 10, 2026	11-50	20 contacts →
	Exact match “Located in Washington, DC, Bradley Site Design is a dynamic Landscape Architecture, Civil Engineering and Planning firm founded in 1994 and dedicated to the creation of socially…” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
9	Bfa, INC	Exact match	Washington, MO, United StatesHQ recorded Oct 10, 2026	11-50	19 contacts →
	Exact match “BFA is a consulting civil engineering firm located in downtown Washington, Missouri.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
10	Blackwoods Group	Exact match	Washington, DC, United StatesHQ recorded Oct 10, 2026	1-10	13 contacts →
	Exact match “Blackwoods Group is an agriculture and natural resource consulting firm that provides a variety of services ranging from government relations to development and implementation of…” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
11	LEE And Associates, INC	Exact match	Washington, DC, United StatesHQ recorded Oct 10, 2026	11-50	11 contacts →
	Exact match “lee and associates, inc (lai) is a respected and highly responsive firm offering planning and design professional services as it relates to how man relates to the land and the…” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
12	Designgreen, LLC	Exact match	Washington, DC, United StatesHQ recorded Oct 10, 2026	1-10	7 contacts →
	Exact match “Designgreen, LLC is a woman-owned engineering firm located in the District of Columbia offering professional consulting and technical support services for small and large projects…” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
13	DRM International, INC	Exact match	Washington, DC, United StatesHQ recorded Oct 10, 2026	1-10	7 contacts →
	Exact match “DRM International, Inc,(DRM) is a leading DIsadvantaged Business Enterprise (DBE) professional engineering consulting firm offering engineering, architectural, planning…” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
14	Huska & Horgan Engineering	Exact match	Washington, DC, United StatesHQ recorded Oct 10, 2026	1-10	6 contacts →
	Exact match “Founded in 2016, Huska & Horgan Engineering, formerly Huska Consulting, is a top-notch civil engineering firm serving the greater Washington, D.C.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
15	Grotheer & CO	Exact match	Washington, DC, United StatesHQ recorded Oct 10, 2026	11-50	5 contacts →
	Exact match “GROTHEER & CO, a small business located in Washington, DC, has been practicing professional engineering since 1954, and has completed thousands of projects for local and federal…” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
16	Core Engineers Consulting Group	Exact match	Washington, DC, United StatesHQ recorded Oct 10, 2026	1-10	4 contacts →
	Exact match “CORE Engineers Consulting Group (CORE Group) is a Washington DC based engineering firm specializing in code consulting and fire protection engineering for the building and…” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
17	Greening Urban LLC	Exact match	Washington, DC, United StatesHQ recorded Oct 10, 2026	1-10	4 contacts →
	Exact match “Greening Urban is a civil engineering firm with built projects in Washington, D.C; Maryland; and Virginia.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
18	Deborah Brosnan & Associates	Exact match	Washington, DC, United StatesHQ recorded Oct 10, 2026	1-10	3 contacts →
	Exact match “Leading and innovative company that finding solutions, bridging gaps and driving positive action for clients and the planet.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
19	Mzdesigns, Pllc	Exact match	Washington, DC, United StatesHQ recorded Oct 10, 2026	1-10	3 contacts →
	Exact match “We are trusted advisors, planners, designers and engineers.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
20	Allied Companies	Exact match	Washington, DC, United StatesHQ recorded Oct 10, 2026	11-50	2 contacts →
	Exact match “Professional services firm providing civil and environmental engineering as well as Program Management & Construction Management to government and private clients.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
21	Warwick Group Consultants, LLC	Exact match	Washington, DC, United StatesHQ recorded Oct 10, 2026	1-10	2 contacts →
	Exact match “Warwick Group Consultants is the Nation's premier consulting firm for local governments with coastal projects involving beach nourishment, dredging, aquatic ecosystem restoration…” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
22	Empower Infrastructure	Exact match	Washington, DC, United StatesHQ recorded Oct 10, 2026	1-10	2 contacts →
	Exact match “EMPOWER INFRASTRUCTURE LLC is registered as CBE, SBE, and DBE for Washington DC, DDOT, Virginia, VDOT, and WMATA.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
23	Build Better Group BBG	Exact match	Washington, United StatesHQ recorded Oct 10, 2026	11-50	1 contacts →
	Exact match “The Clean Energy DC Act, passed in December 2018, is the nation’s first 100% renewal energy bill and the most aggressive, fastest-acting climate change legislation in the country.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
24	Global, Inc. USA	Exact match	Washington, DC, United StatesHQ recorded Oct 10, 2026	1-10	1 contacts →
	Exact match “Global, Inc.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “conservation engineering firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 24 of 40 conservation engineering firms based in Washington, United States

See the full list, filter by size, metro and specialty, and access 228 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Conservation engineering firms based in Washington, United States at a glance

As of Oct 10, 2026

54.5%Verified-email coverage

10.4Average contacts per company

1-10Median size (employees)

Oct 10, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

Email recency for this list is measured across the whole United States list rather than for Washington, so it is reported there. Company counts and contact totals on this page are exact for Washington, over 40 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with Washington, United States whose business descriptions match “conservation engineering firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 228 professional contacts with verified work emails across the full matched dataset. 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 October 10, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Conservation engineering firms by metro in the United States

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “conservation engineering firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many conservation engineering firms are there based in Washington, United States?

RevenueBase identified 40 company matches for conservation engineering firms associated with Washington, United States as of October 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Delon Hampton & Associates, Chartered tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United States has the most conservation engineering firms?

Houston leads the United States with 132 company records, followed by New York (82) and Austin (75). Washington has 40.

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 228 professional contacts with verified work emails tracked across these 40 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on October 10, 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 SmartSearch, 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.