Company lists · Data refreshed September 2026

Top 25 Wastewater treatment system designers based in the United States

Name: Wastewater treatment system designers 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 1,273 companies tracked

RevenueBase identified 1,273 wastewater treatment system designers headquartered in the United States as of September 2026 and tracks 26,071 professional contacts across them, including 10,054 with verified work emails. Houston is the largest hub.

This list covers wastewater treatment system designers 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

1,273Companies

26,071Contacts tracked

10,054Verified emails

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The 25 largest wastewater treatment system designers based in the United States

Ranked by team size

Top 25 of 1,273 wastewater treatment system designers 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 wastewater treatment system designers: 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	Brown And Caldwell	Indirect evidence	Walnut Creek, CA, United StatesHQ checked Sep 22, 2026	1,001-5,000	2,473 contacts →
	Indirect evidence “Headquartered in Walnut Creek, Calif, Brown and Caldwell is an employee-owned firm with 2,100+ professionals serving clients locally and globally from 52 locations.” Source: RevenueBase Database · checked Sep 22, 2026
2	Carollo Engineers	Partial evidence	Walnut Creek, CA, United StatesHQ checked Sep 22, 2026	1,001-5,000	1,718 contacts →
	Partial evidence “For more than 90 years, Carollo Engineers has been dedicated exclusively to water and wastewater solutions.” Source: RevenueBase Database · checked Sep 22, 2026
3	Westech Engineering	Strong evidence	Salt Lake City, UT, United StatesHQ checked Sep 22, 2026	501-1,000	554 contacts →
	Strong 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
4	UCC Environmental	Strong evidence	Waukegan, IL, United StatesHQ checked Sep 22, 2026	201-500	389 contacts →
	Strong evidence “UCC Environmental (UCC) is a global leader in environmental solutions for solids handling, wastewater treatment and pollution control technologies in power generation and other…” Source: RevenueBase Database · checked Sep 22, 2026
5	Parkson Corporation	Strong evidence	Fort Lauderdale, FL, United StatesHQ checked Sep 22, 2026	51-200	317 contacts →
	Strong 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
6	Infiltrator Water Technologies Decentralized Wastewater Treatment Solutions	Strong evidence	Old Saybrook, CT, United StatesHQ checked Sep 22, 2026	501-1,000	295 contacts →
	Strong evidence “Protecting the environment with innovative wastewater treatment solutions for over 35 years, Infiltrator is the leading manufacturer of onsite wastewater treatment products in…” Source: RevenueBase Database · checked Sep 22, 2026
7	Culligan By Waterco	Strong evidence	Lombard, IL, United StatesHQ checked Sep 22, 2026	501-1,000	265 contacts →
	Strong 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
8	Valicor	Indirect evidence	Monroe, OH, United StatesHQ checked Sep 22, 2026	201-500	254 contacts →
	Indirect evidence “Valicor is a trusted partner for sustainable waste management solutions.” Source: RevenueBase Database · checked Sep 22, 2026
9	Prominent North America	Partial evidence	Pit, United StatesHQ checked Sep 22, 2026	201-500	251 contacts →
	Partial evidence “ProMinent North America is part of the global ProMinent Group, a pioneer in metering technology and water treatment solutions with roots in Heidelberg, Germany.” Source: RevenueBase Database · checked Sep 22, 2026
10	Huber Technology US	Indirect evidence	Denver, NC, United StatesHQ checked Sep 22, 2026	201-500	243 contacts →
	Indirect evidence “HUBER Technology, LLC, the U.S.” Source: RevenueBase Database · checked Sep 22, 2026
11	Usabluebook	Partial evidence	Waukegan, IL, United StatesHQ checked Sep 22, 2026	5,001-10,000	241 contacts →
	Partial evidence “Rely on USABlueBook for everything you need for water and wastewater operations and maintenance.” Source: RevenueBase Database · checked Sep 22, 2026
12	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
13	Fluence Corporation	Partial evidence	Minneapolis, MN, United StatesHQ checked Sep 22, 2026	201-500	195 contacts →
	Partial evidence “Formed in 2017 following the consolidation of independent water treatment solution providers Emefcy and RWL Water, Fluence Corporation was established with the vision of becoming…” Source: RevenueBase Database · checked Sep 22, 2026
14	Newterra	Strong evidence	Coraopolis, PA, United StatesHQ checked Sep 22, 2026	201-500	185 contacts →
	Strong 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
15	Felix Construction Company	Indirect evidence	Phoenix, AZ, United StatesHQ checked Sep 22, 2026	201-500	178 contacts →
	Indirect evidence “Felix Construction Company is a general engineering contractor and construction management company with a specific focus on: Water production facilities, well sites, booster pump…” Source: RevenueBase Database · checked Sep 22, 2026
16	Smith & Loveless INC	Strong evidence	Lenexa, KS, United StatesHQ checked Sep 22, 2026	201-500	172 contacts →
	Strong 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
17	Orenco Systems, INC	Partial evidence	Sutherlin, OR, United StatesHQ checked Sep 22, 2026	201-500	170 contacts →
	Partial evidence “Nobody wants to worry about whether their wastewater is contaminating nearby rivers, streams, and wells.” Source: RevenueBase Database · checked Sep 22, 2026
18	National Water Main Cleaning Company	Indirect evidence	Kearny, NJ, United StatesHQ checked Sep 22, 2026	51-200	150 contacts →
	Indirect evidence “National Water Main Cleaning Co.” Source: RevenueBase Database · checked Sep 22, 2026
19	Apex Water And Process	Indirect evidence	St Michael, MN, United StatesHQ checked Sep 22, 2026	201-500	143 contacts →
	Indirect 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
20	A&b Process Systems	Partial evidence	Stratford, WI, United StatesHQ checked Sep 22, 2026	201-500	142 contacts →
	Partial evidence “We are an industry leader in the design, engineering, development, fabrication, and installation of process systems for many industries that touch the lives of almost everyone on…” Source: RevenueBase Database · checked Sep 22, 2026
21	Rh2 Engineering	Partial evidence	Bothell, WA, United StatesHQ checked Sep 22, 2026	51-200	136 contacts →
	Partial evidence “RH2 is an innovative, full-service engineering firm specializing in water and wastewater related projects.” Source: RevenueBase Database · checked Sep 22, 2026
22	Aqualis	Indirect evidence	Morrisville, NC, United StatesHQ checked Sep 22, 2026	501-1,000	136 contacts →
	Indirect 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
23	Water Works Engineers	Indirect evidence	Scottsdale, AZ, United StatesHQ checked Sep 22, 2026	51-200	135 contacts →
	Indirect evidence “Water Works Engineers is a leading civil and environmental engineering firm specializing in innovative and sustainable solutions for water infrastructure projects across the…” Source: RevenueBase Database · checked Sep 22, 2026
24	Tomorrow Water	Strong evidence	Anaheim, CA, United StatesHQ checked Sep 22, 2026	51-200	133 contacts →
	Strong evidence “Tomorrow Water is an innovative environmental solutions company specializing in both wastewater and organic waste treatment.” Source: RevenueBase Database · checked Sep 22, 2026
25	Donohue & Associates, INC	Indirect evidence	Sheboygan, WI, United StatesHQ checked Sep 22, 2026	51-200	129 contacts →
	Indirect evidence “Donohue & Associates is an employee-owned, multi-disciplined engineering firm dedicated to one focus: water.” 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: wastewater treatment system designers. 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 wastewater treatment system designers.
Partial evidence: Its own public description names part of wastewater treatment system designers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name wastewater treatment system designers. 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 1,273 wastewater treatment system designers based in the United States

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Wastewater treatment system designers based in the United States at a glance

As of Sep 22, 2026

38.6%Verified-email coverage

20.5Average contacts per company

11-50Median size (employees)

2.4%Largest-city concentration · Houston

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

488

11-50

510

51-200

205

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 1,273 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 wastewater treatment system designers, 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 “wastewater treatment system designers”. 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 wastewater treatment system designers), 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 wastewater treatment system designers, 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, 10,054 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.

Wastewater treatment system designers by metro

Wastewater treatment system designers in Houston31

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 wastewater treatment system designers, 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 wastewater treatment system designers are there based in the United States?

RevenueBase identified 1,273 wastewater treatment system designers 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?

Brown And Caldwell, headquartered in Walnut Creek, tops this list with the largest team on record.

Which city has the most wastewater treatment system designers?

Houston leads with 31 headquartered companies, followed by Phoenix (13) and Austin (12).

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 10,054 verified decision-maker contacts tracked across these 1,273 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.