Company lists · Data refreshed September 2026

Top 25 Environmental lab staffing agencies based in the United States

Name: Environmental lab staffing agencies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 954 companies tracked

RevenueBase identified 954 environmental lab staffing agencies headquartered in the United States as of September 2026 and tracks 23,509 professional contacts across them, including 6,498 with verified work emails. New York is the largest hub.

This list covers environmental lab staffing agencies 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 28, 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 28, 2026 86% judged on-target in blind review

954Companies

23,509Contacts tracked

6,498Verified emails

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The 25 largest environmental lab staffing agencies based in the United States

Ranked by team size

Top 25 of 954 environmental lab staffing agencies based in the United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to environmental lab staffing agencies: 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	Pace Analytical Services	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,228 contacts →
	Indirect evidence “Pace® Science and Technology Company makes the world a safer, healthier place.” Source: RevenueBase Database · checked Sep 28, 2026
2	Alliance Technical Group	Partial evidence	Decatur, AL, United StatesHQ checked Sep 28, 2026	1,001-5,000	956 contacts →
	Partial evidence “Alliance is a new kind of environmental services company-powered by innovation, focused on service, and committed to client success.” Source: RevenueBase Database · checked Sep 28, 2026
3	Trojan Labor	Partial evidence	Goose Creek, SC, United StatesHQ checked Sep 28, 2026	n/a	732 contacts →
	Partial evidence “Trojan Labor Specializes in matching Customers who have industrial and Light Industrial staffing needs while never forgetting who the CUSTOMER is.” Source: RevenueBase Database · checked Sep 28, 2026
4	Emsl Analytical, INC	Partial evidence	Cinnaminson, NJ, United StatesHQ checked Sep 28, 2026	501-1,000	719 contacts →
	Partial evidence “As the nation's leading environmental testing firm, EMSL's network of nationwide laboratories has been providing quality analytical services since 1981.” Source: RevenueBase Database · checked Sep 28, 2026
5	Trillium Staffing Solutions	Partial evidence	Kalamazoo, MI, United StatesHQ checked Sep 28, 2026	1,001-5,000	653 contacts →
	Partial evidence “Trillium Staffing Solutions is an employment service specializing in staffing, training, testing, on-site services, human resources and safety consulting.” Source: RevenueBase Database · checked Sep 28, 2026
6	Automation Personnel Services, INC	Indirect evidence	Birmingham, AL, United StatesHQ checked Sep 28, 2026	10001+	624 contacts →
	Indirect evidence “Automation Personnel Services was founded in Birmingham, AL almost 30 years ago and has expanded coast to coast with 40 Branch offices in eleven states.” Source: RevenueBase Database · checked Sep 28, 2026
7	Hirequest Direct	Indirect evidence	Nashville, TN, United StatesHQ checked Sep 28, 2026	n/a	618 contacts →
	Indirect evidence “HireQuest Direct specializes in day labor, general labor, disaster recovery, skilled labor, janitorial, site clean-up, composite crew, demolition, administrative, hospitality…” Source: RevenueBase Database · checked Sep 28, 2026
8	Proman Staffing USA	Partial evidence	Northbrook, IL, United StatesHQ checked Sep 28, 2026	201-500	560 contacts →
	Partial evidence “PROMAN Staffing has more than 50 offices in 12+ states across the USA.” Source: RevenueBase Database · checked Sep 28, 2026
9	NSC	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 28, 2026	1,001-5,000	473 contacts →
	Partial evidence “Welcome to NSC, the Skilled Staffing Experts!” Source: RevenueBase Database · checked Sep 28, 2026
10	Ascend Staffing	Partial evidence	North Salt Lake, UT, United StatesHQ checked Sep 28, 2026	51-200	388 contacts →
	Partial evidence “In 1969, we evolved from a local staffing firm to a national leader, specializing in light industrial, non-clinical hospital, and clerical roles.” Source: RevenueBase Database · checked Sep 28, 2026
11	Enthalpy Analytical	Indirect evidence	North Little Rock, AR, United StatesHQ checked Sep 28, 2026	501-1,000	349 contacts →
	Indirect evidence “Our laboratory service experts provide clients with precision testing support, innovative scientific approaches, and high-quality data that delivers a sense of certainty.” Source: RevenueBase Database · checked Sep 28, 2026
12	At Your Service Staffing	Indirect evidence	New York, NY, United StatesHQ checked Sep 28, 2026	1,001-5,000	262 contacts →
	Indirect evidence “For more than 30 years, At Your Service has been helping our clients produce memorable moments.” Source: RevenueBase Database · checked Sep 28, 2026
13	Alpha Analytical	Indirect evidence	Westborough, MA, United StatesHQ checked Sep 28, 2026	501-1,000	254 contacts →
	Indirect evidence “Since 1987, Alpha Analytical, Inc.” Source: RevenueBase Database · checked Sep 28, 2026
14	Environmental Works, INC	Partial evidence	Springfield, MO, United StatesHQ checked Sep 28, 2026	201-500	238 contacts →
	Partial evidence “Environmental Works, Inc.(EWI) offers truly comprehensive environmental solutions for a variety of industries, businesses, and municipalities.” Source: RevenueBase Database · checked Sep 28, 2026
15	Specialized Staffing Solutions	Partial evidence	South Bend, IN, United StatesHQ checked Sep 28, 2026	n/a	201 contacts →
	Partial evidence “Specialized Staffing Solutions employs thousands of employees each year in the Michiana region for Light Industrial, Office Administrative, Technical and Direct Professional…” Source: RevenueBase Database · checked Sep 28, 2026
16	NVT Staffing, INC	Partial evidence	Falls Church, VA, United StatesHQ checked Sep 28, 2026	501-1,000	199 contacts →
	Partial evidence “NVT Staffing is a direct reflection of the rapid growth and expansion of our parent company, Northern Virginia Temporaries, Inc.” Source: RevenueBase Database · checked Sep 28, 2026
17	Resource Options, INC	Strong evidence	Needham, MA, United StatesHQ checked Sep 28, 2026	n/a	187 contacts →
	Strong evidence “Resource Options Inc.(ROI) provides custom staffing solutions to the design, construction, environmental, & emergency response industries.” Source: RevenueBase Database · checked Sep 28, 2026
18	Action Labor And Staffing Connection	Partial evidence	West Palm Beach, FL, United StatesHQ checked Sep 28, 2026	51-200	180 contacts →
	Partial evidence “Action Labor is first in the temporary staffing field, with jobs filled each year, providing off-site employment services for every type of business.” Source: RevenueBase Database · checked Sep 28, 2026
19	Enviroscience, INC	Partial evidence	Stow, OH, United StatesHQ checked Sep 28, 2026	51-200	176 contacts →
	Partial evidence “EnviroScience is a team of over 150 expert biologists, commercial divers, environmental engineers, and environmental scientists that provides biomonitoring, environmental…” Source: RevenueBase Database · checked Sep 28, 2026
20	Midway Staffing	Partial evidence	Hillside, IL, United StatesHQ checked Sep 28, 2026	1,001-5,000	167 contacts →
	Partial evidence “If you’re looking for a rewarding position to grow your career, you can find it here at Midway Staffing.” Source: RevenueBase Database · checked Sep 28, 2026
21	Advanced Environmental Laboratories, INC	Partial evidence	Jacksonville, FL, United StatesHQ checked Sep 28, 2026	51-200	158 contacts →
	Partial evidence “Advanced Environmental Laboratories, Inc.(AEL) is a NELAP/TNI and DOD certified, national full-service laboratory firm, headquartered in Jacksonville, Florida, with additional…” Source: RevenueBase Database · checked Sep 28, 2026
22	Smithers	Partial evidence	Wareham, MA, United StatesHQ checked Sep 28, 2026	1,001-5,000	155 contacts →
	Partial evidence “Smithers is a leading provider of environmental risk testing to the Agrochemical, Pharmaceutical, and Chemical industries.” Source: RevenueBase Database · checked Sep 28, 2026
23	Mostardi Platt	Partial evidence	Elmhurst, IL, United StatesHQ checked Sep 28, 2026	51-200	140 contacts →
	Partial evidence “Since the passage of original environmental legislation nearly four decades ago, both private and public industry have turned to Mostardi Platt for guidance in complying with air…” Source: RevenueBase Database · checked Sep 28, 2026
24	Graymar Environmental Services, LLC	Indirect evidence	Cherry Hill, NJ, United StatesHQ checked Sep 28, 2026	201-500	137 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026
25	Safe T Professionals, LLC	Strong evidence	Chandler, AZ, United StatesHQ checked Sep 28, 2026	51-200	130 contacts →
	Strong evidence “We are a successful environment health and safety staffing/staff augmentation and consulting firm with services available worldwide.” Source: RevenueBase Database · checked Sep 28, 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: environmental lab staffing agencies. 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 environmental lab staffing agencies.
Partial evidence: Its own public description names part of environmental lab staffing agencies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name environmental lab staffing agencies. 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 954 environmental lab staffing agencies based in the United States

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Environmental lab staffing agencies based in the United States at a glance

As of Sep 28, 2026

27.6%Verified-email coverage

24.6Average contacts per company

11-50Median size (employees)

2.5%Largest-city concentration · New York

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

342

11-50

341

51-200

171

201-500

501-1,000

1,001-5,000

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 954 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 environmental lab staffing agencies, 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 “environmental lab staffing agencies”. 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 environmental lab staffing agencies), 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 environmental lab staffing agencies, 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, 6,498 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 28, 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 environmental lab staffing agencies, 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 environmental lab staffing agencies are there based in the United States?

RevenueBase identified 954 environmental lab staffing agencies 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?

Pace Analytical Services, headquartered in Minneapolis, tops this list with the largest team on record.

Which city has the most environmental lab staffing agencies?

New York leads with 24 headquartered companies, followed by Houston (21) and San Diego (10).

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 6,498 verified decision-maker contacts tracked across these 954 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 28, 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.