Company lists · Data refreshed September 2026

Top 25 Environmental monitoring system providers based in the United States

Name: Environmental monitoring system providers based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 534 companies tracked

RevenueBase identified 534 environmental monitoring system providers headquartered in the United States as of September 2026 and tracks 13,650 professional contacts across them, including 5,852 with verified work emails. Houston is the largest hub.

This list covers environmental monitoring system providers 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 19, 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 19, 2026 86% judged on-target in blind review

534Companies

13,650Contacts tracked

5,852Verified emails

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The 25 largest environmental monitoring system providers based in the United States

Ranked by team size

Top 25 of 534 environmental monitoring system providers based in the United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to environmental monitoring system providers: 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	HACH	Indirect evidence	Loveland, CO, United StatesHQ checked Sep 19, 2026	1,001-5,000	3,095 contacts →
	Indirect evidence “At Hach, we ensure water quality for people around the world, and every associate plays a vital role in that mission.” Source: RevenueBase Database · checked Sep 19, 2026
2	Particle Measuring Systems	Strong evidence	Niwot, CO, United StatesHQ checked Sep 19, 2026	501-1,000	483 contacts →
	Strong evidence “Overview Particle Measuring Systems sets the standard for contamination monitoring.” Source: RevenueBase Database · checked Sep 19, 2026
3	Mesa Laboratories, INC	Partial evidence	Lakewood, CO, United StatesHQ checked Sep 19, 2026	501-1,000	323 contacts →
	Partial evidence “Mesa Labs helps you monitor and maintain higher standards in any environment – from the air we breathe to the critical moments of life-saving care.” Source: RevenueBase Database · checked Sep 19, 2026
4	Picarro	Indirect evidence	Santa Clara, CA, United StatesHQ checked Sep 19, 2026	201-500	297 contacts →
	Indirect evidence “Reducing emissions, detecting leaks, mitigating risk, optimizing operations, ensuring compliance and advancing research are some of the challenges facing our clients.” Source: RevenueBase Database · checked Sep 19, 2026
5	Alpha Analytical	Indirect evidence	Westborough, MA, United StatesHQ checked Sep 19, 2026	501-1,000	254 contacts →
	Indirect evidence “Since 1987, Alpha Analytical, Inc.” Source: RevenueBase Database · checked Sep 19, 2026
6	OTT Hydromet	Indirect evidence	Sterling, VA, United StatesHQ checked Sep 19, 2026	201-500	231 contacts →
	Indirect evidence “OTT HydroMet works to deliver customer outcomes by providing decision makers with vital insights they trust.” Source: RevenueBase Database · checked Sep 19, 2026
7	Dickson	Partial evidence	Addison, IL, United StatesHQ checked Sep 19, 2026	51-200	223 contacts →
	Partial evidence “Since 1923, the Dickson Company has helped numerous organizations monitor their most sensitive environments.” Source: RevenueBase Database · checked Sep 19, 2026
8	Rees Scientific	Partial evidence	Trenton, NJ, United StatesHQ checked Sep 19, 2026	51-200	210 contacts →
	Partial evidence “Rees Scientific provides continuous automated monitoring to a limitless number of applications in a wide range of industries.” Source: RevenueBase Database · checked Sep 19, 2026
9	Ysi, INC	Strong evidence	Yellow Springs, OH, United StatesHQ checked Sep 19, 2026	201-500	194 contacts →
	Strong evidence “YSI is the maker of environmental, laboratory, and municipal monitoring instruments, sensors, software, systems, and data collection platforms for water quality monitoring and…” Source: RevenueBase Database · checked Sep 19, 2026
10	Plateau GRP	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 19, 2026	51-200	192 contacts →
	Indirect evidence “Plateau Grp provides innovative and agile IT solutions to customer challenges.” Source: RevenueBase Database · checked Sep 19, 2026
11	LWS Lighthouse Worldwide Solutions	Indirect evidence	White City, OR, United StatesHQ checked Sep 19, 2026	201-500	175 contacts →
	Indirect evidence “When you need to monitor your cleanroom for contamination, Lighthouse is your premier solution provider.” Source: RevenueBase Database · checked Sep 19, 2026
12	In-Situ Environmental	Partial evidence	Fort Collins, CO, United StatesHQ checked Sep 19, 2026	201-500	170 contacts →
	Partial evidence “In-Situ simplifies water monitoring for surface water, coastal, groundwater, aquaculture, drinking water and wastewater applications with reliable, low-maintenance instrumentation…” Source: RevenueBase Database · checked Sep 19, 2026
13	Earthsoft	Strong evidence	Pensacola, FL, United StatesHQ checked Sep 19, 2026	51-200	168 contacts →
	Strong evidence “EarthSoft is the recognized leader in providing environmental and geotechnical data management and decision support systems for industrial organizations, government agencies…” Source: RevenueBase Database · checked Sep 19, 2026
14	Meter Group	Partial evidence	Pullman, WA, United StatesHQ checked Sep 19, 2026	201-500	164 contacts →
	Partial evidence “METER Group designs and manufactures scientific instrumentation that delivers real-time, environmental data to the agricultural, urban, and research sectors.” Source: RevenueBase Database · checked Sep 19, 2026
15	TASC	Partial evidence	Seabrook, TX, United StatesHQ checked Sep 19, 2026	201-500	161 contacts →
	Partial evidence “Automation and Technology Group: Specializing in Analyzer System Integration.” Source: RevenueBase Database · checked Sep 19, 2026
16	Advanced Environmental Laboratories, INC	Partial evidence	Jacksonville, FL, United StatesHQ checked Sep 19, 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 19, 2026
17	Lamotte Company	Partial evidence	Chestertown, MD, United StatesHQ checked Sep 19, 2026	201-500	154 contacts →
	Partial evidence “Since 1919, we are a leading manufacturer of environmental testing equipment for water and soil.” Source: RevenueBase Database · checked Sep 19, 2026
18	Cleanair Engineering	Indirect evidence	Palatine, IL, United StatesHQ checked Sep 19, 2026	51-200	152 contacts →
	Indirect evidence “Since its founding in 1972, CleanAir has an established reputation for excellence on projects of all sizes, ranging from boiler, APC equipment and cooling tower efficiency testing…” Source: RevenueBase Database · checked Sep 19, 2026
19	Li-Cor	Strong evidence	Lincoln, NE, United StatesHQ checked Sep 19, 2026	201-500	136 contacts →
	Strong evidence “LI-COR is a leader in environmental measurement and monitoring solutions.” Source: RevenueBase Database · checked Sep 19, 2026
20	ESC Spectrum Corporation	Indirect evidence	Austin, TX, United StatesHQ checked Sep 19, 2026	51-200	114 contacts →
	Indirect evidence “Based in Austin, Texas, ESC Spectrum, an Alliance Technical Group company, is a leading provider of products and services for customers in a variety of industries, from Electric…” Source: RevenueBase Database · checked Sep 19, 2026
21	Metiri Group	Partial evidence	Geneva, IL, United StatesHQ checked Sep 19, 2026	201-500	112 contacts →
	Partial evidence “Established in 2019, Metiri Group has focused on using full-service environmental laboratories to deliver testing services to inform the decisions that improve the lives of people…” Source: RevenueBase Database · checked Sep 19, 2026
22	Edstrom Industries	Indirect evidence	Waterford, WI, United StatesHQ checked Sep 19, 2026	201-500	102 contacts →
	Indirect evidence “Avidity Science launches its golden anniversary with a year-long celebration of achievements and milestones from the past 50 years.” Source: RevenueBase Database · checked Sep 19, 2026
23	SKC INC	Indirect evidence	Eighty Four, PA, United StatesHQ checked Sep 19, 2026	51-200	95 contacts →
	Indirect evidence “SKC is a well-known and respected leader in industrial hygiene and occupational safety.” Source: RevenueBase Database · checked Sep 19, 2026
24	Field Environmental Instruments	Indirect evidence	Pittsburgh, PA, United StatesHQ checked Sep 19, 2026	51-200	95 contacts →
	Indirect evidence “What is the FEI Advantage?” Source: RevenueBase Database · checked Sep 19, 2026
25	Locus Technologies	Partial evidence	Mountain View, CA, United StatesHQ checked Sep 19, 2026	51-200	95 contacts →
	Partial evidence “Locus Technologies is the only scientist-driven software company at the nexus of analytical and field data management, Environmental, Health, and Safety (EHS) compliance, and…” Source: RevenueBase Database · checked Sep 19, 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 monitoring system providers. 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 monitoring system providers.
Partial evidence: Its own public description names part of environmental monitoring system providers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name environmental monitoring system providers. 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 534 environmental monitoring system providers based in the United States

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Environmental monitoring system providers based in the United States at a glance

As of Sep 19, 2026

42.9%Verified-email coverage

25.6Average contacts per company

11-50Median size (employees)

2.1%Largest-city concentration · Houston

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

212

11-50

218

51-200

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 534 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 monitoring system providers, 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 monitoring system providers”. 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 monitoring system providers), 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 monitoring system providers, 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, 5,852 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 19, 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 monitoring system providers, 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 monitoring system providers are there based in the United States?

RevenueBase identified 534 environmental monitoring system providers 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?

HACH, headquartered in Loveland, tops this list with the largest team on record.

Which city has the most environmental monitoring system providers?

Houston leads with 11 headquartered companies, followed by San Diego (9) and Pittsburgh (8).

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 5,852 verified decision-maker contacts tracked across these 534 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 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 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.