Company lists · Data refreshed September 2026

Top 22 Water infrastructure engineering firms based in Seattle, United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 30 companies tracked

RevenueBase identified 30 company matches for water infrastructure engineering firms associated with Seattle, United States as of September 2026 and tracks 2,425 professional contacts across them, including 1,709 with verified work emails. Across the United States, Houston is the largest hub for this category (139 companies); Seattle has 30.

This list covers company matches for water infrastructure engineering firms associated with Seattle, 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 September 19, 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 Sep 19, 2026 How this list was built

30Companies

2,425Contacts tracked

1,709Verified emails

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The 22 largest water infrastructure engineering firms based in Seattle, United States

Ranked by team size

Top 22 of 30 company matches for water infrastructure engineering firms based in Seattle, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 19, 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	Parametrix	Exact match	Seattle, WA, United StatesHQ recorded Sep 19, 2026	501-1,000	880 contacts →
	Exact match “At Parametrix, we help our clients imagine what's possible.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
2	Anchor QEA	Exact match	Seattle, WA, United StatesHQ recorded Sep 19, 2026	501-1,000	479 contacts →
	Exact match “Headquartered in Seattle, Washington, Anchor QEA is a nationally recognized environmental science and engineering consulting firm specializing in aquatic, shoreline, and water…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
3	Delve Underground	Exact match	Seattle, WA, United StatesHQ recorded Sep 19, 2026	201-500	311 contacts →
	Exact match “Delve Underground is a leader in heavy civil engineering, serving the transportation, water, wastewater, and energy industries.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
4	Magnusson Klemencic Associates	Exact match	Seattle, WA, United StatesHQ recorded Sep 19, 2026	51-200	190 contacts →
	Exact match “We engineer the future of the built environment, one structure, skyline, and community at a time.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
5	Herrera Environmental Consultants	Exact match	Seattle, WA, United StatesHQ recorded Sep 19, 2026	51-200	176 contacts →
	Exact match “Herrera Environmental Consultants is a leading engineering and scientific consulting firm focused on restoration, water, and sustainable development.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
6	Perteet INC	Exact match	Seattle, WA, United StatesHQ recorded Sep 19, 2026	51-200	126 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
7	Gray & Osborne	Exact match	Seattle, WA, United StatesHQ recorded Sep 19, 2026	51-200	99 contacts →
	Exact match “Municipal Engineering Services” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
8	Hart Crowser, A Division Of Haley & Aldrich	Exact match	Seattle, WA, United StatesHQ recorded Sep 19, 2026	51-200	49 contacts →
	Exact match “Hart Crowser’s engineers and scientists have the up-to-date knowledge to support practical designs and recommendations.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
9	LPD Engineering Pllc	Exact match	Seattle, WA, United StatesHQ recorded Sep 19, 2026	11-50	19 contacts →
	Exact match “Improving our communities through economical, functional and sustainable civil design solutions.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
10	Watershed Science & Engineering	Exact match	Seattle, WA, United StatesHQ recorded Sep 19, 2026	11-50	16 contacts →
	Exact match “At WSE, our focus is on service.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
11	Jacobson Consulting Engineers	Exact match	Seattle, WA, United StatesHQ recorded Sep 19, 2026	11-50	12 contacts →
	Exact match “Your trusted partners, delivering innovative solutions and expert civil site development.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
12	Latitude 48 Engineers	Exact match	Seattle, WA, United StatesHQ recorded Sep 19, 2026	1-10	8 contacts →
	Exact match “OUR FIRM We're a Seattle based Civil Engineering Firm focused on superior service accompanied with cutting edge analysis and design capabilities.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
13	Green Earth Operations, INC	Exact match	Seattle, WA, United StatesHQ recorded Sep 19, 2026	11-50	8 contacts →
	Exact match “Green Earth Operations is an environmental science and engineering firm providing objective analysis and environmentally responsible solutions to meet the needs of our clients.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
14	Confluence Engineering Group LLC	Exact match	Seattle, WA, United StatesHQ recorded Sep 19, 2026	1-10	7 contacts →
	Exact match “Confluence is a world-class drinking water quality firm focused on providing clients exceptional water quality engineering, planning, and applied research services.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
15	Ergosync Engineering	Exact match	Seattle, WA, United StatesHQ recorded Sep 19, 2026	11-50	6 contacts →
	Exact match “Ergosync is a full-service electrical and systems engineering company offering design services, project management, construction support, and commissioning services.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
16	Coterra Engineering, Pllc	Exact match	Seattle, WA, United StatesHQ recorded Sep 19, 2026	1-10	6 contacts →
	Exact match “Located in the Phinney Ridge neighborhood of Seattle, Coterra provides civil engineering services to private organizations and public agencies, offering a range of expertise in…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
17	Pacific Stormwater	Exact match	Seattle, WA, United StatesHQ recorded Sep 19, 2026	1-10	6 contacts →
	Exact match “Founded in 2014 as a small, woman-owned engineering consulting firm with a specialty in stormwater treatment design, Pacific Stormwater has gone on to serve a variety of clients…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
18	CM Design Group	Exact match	Seattle, WA, United StatesHQ recorded Sep 19, 2026	1-10	5 contacts →
	Exact match “CM Design Group, LLC is a Seattle based civil engineering design firm established in 2011.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
19	Thorco Construction	Exact match	Seattle, WA, United StatesHQ recorded Sep 19, 2026	1-10	3 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
20	Patrick Harron & Associates, LLC	Exact match	Seattle, WA, United StatesHQ recorded Sep 19, 2026	1-10	1 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
21	Transcon Company LLC	Exact match	Seattle, WA, United StatesHQ recorded Sep 19, 2026	1-10	1 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
22	Robin Kirschbaum, INC	Exact match	Seattle, WA, United StatesHQ recorded Sep 19, 2026	1-10	1 contacts →
	Exact match “Consulting engineers delivering sustainable, cost-effective water infrastructure projects for public agency and private clients.” Recorded in the RevenueBase company graph · Sep 19, 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 “water infrastructure 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 22 of 30 water infrastructure engineering firms based in Seattle, United States

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Water infrastructure engineering firms based in Seattle, United States at a glance

As of Sep 19, 2026

70.5%Verified-email coverage

80.8Average contacts per company

11-50Median size (employees)

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

Email recency for this list is measured across the whole United States list rather than for Seattle, so it is reported there. Company counts and contact totals on this page are exact for Seattle, over 30 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 Seattle, United States whose business descriptions match “water infrastructure 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 1,709 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 September 19, 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.

Water infrastructure 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 “water infrastructure engineering firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many water infrastructure engineering firms are there based in Seattle, United States?

RevenueBase identified 30 company matches for water infrastructure engineering firms associated with Seattle, United States as of September 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?

Parametrix 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 water infrastructure engineering firms?

Houston leads the United States with 139 company records, followed by Austin (59) and New York (58). Seattle has 30.

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 1,709 professional contacts with verified work emails tracked across these 30 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 September 19, 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.