> Enrich.chat gives AI agents verified work emails and mobiles. To use it from an agent, read https://enrich.chat/agents.md . This is the Markdown version of https://enrich.chat/companies-in/washington-dc/environmental-services/ # Environmental Services Companies in Washington, DC The bigger environmental services companies headquartered in Washington, DC, with what they do, their sizes and how to reach their people. By Enrich.chat Editorial. Updated October 22, 2026. **Short answer:** Among the environmental services companies counted in Washington, DC, the biggest by headcount range include Evoqua Water Technologies, Global Methane Initiative Gmi and Greenhouse Gas Protocol Ghg Protocol. They are mostly very small: 74% have 50 or fewer employees. ## Which environmental services companies are in Washington, DC? Among the companies whose public profile lists Environmental Services as their industry and Washington, DC as their headquarters, the biggest by headcount range include Evoqua Water Technologies, Global Methane Initiative Gmi, Greenhouse Gas Protocol Ghg Protocol, US Environmental Protection Agency (EPA) and Verra. Names link to a company profile where we have one. | Company | Employees | | --- | --- | | Evoqua Water Technologies | 10,001+ | | Global Methane Initiative Gmi | 1,001 to 5,000 | | Greenhouse Gas Protocol Ghg Protocol | 501 to 1,000 | | [US Environmental Protection Agency (EPA)](https://enrich.chat/company/us-environmental-protection-agency-epa/) | 201 to 500 | | Verra | 51 to 200 | | Land Trust Alliance | 51 to 200 | | American Forest Foundation | 51 to 200 | | Amazon Conservation | 51 to 200 | | C-Quest Capital | 51 to 200 | | Paintcare | 51 to 200 | | Peer Consultants, P.C | 51 to 200 | | Forest Climate Working Group | 51 to 200 | | Sustainable You | 51 to 200 | | Beyond Trees Network | 51 to 200 | | Modulus | 51 to 200 | | Bird City Network | 51 to 200 | | Green Business Certification Inc Gbci | 11 to 50 | | Association Of Plastic Recyclers Apr | 11 to 50 | | Ndc Partnership | 11 to 50 | | Earthday.Org | 11 to 50 | | Carbon180 | 11 to 50 | | Forest Trends Association | 11 to 50 | | Natural State | 11 to 50 | | Conservation X Labs | 11 to 50 | | P4g Partnerships | 11 to 50 | The table shows the 25 biggest by headcount range, with ties broken by audience size. The charts and percentages below cover every company counted for this page, not just these 25, and companies with fewer than 11 employees are not counted. Headquarters is the location on each company's public profile. ## What do environmental services companies in Washington, DC do? Environmental Services is a broad label. The most common NAICS codes among them are 522320 (25%), 541620 (25%) and 561730 (25%). **Figure: What environmental services companies in Washington do.** Bars for the share of counted environmental services companies with each code: 522320 25%, 541620 25%, 561730 25%, 813910 25%. *Share of counted environmental services companies in Washington by their NAICS code.* [NAICS 522320](https://enrich.chat/naics/522320/)[NAICS 541620](https://enrich.chat/naics/541620/)[NAICS 561730](https://enrich.chat/naics/561730/) ## How big are they? 74% of the environmental services companies counted in Washington, DC have 50 or fewer employees, and the middle one is in the 11 to 50 range. Companies with fewer than 11 employees are not counted. **Figure: Size of environmental services companies in Washington.** Seven columns for the share of counted environmental services companies in Washington in each employee range: 11 to 50 74%, 51 to 200 19%, 201 to 500 2%, 501 to 1,000 2%, 1,001 to 5,000 2%, 5,001 to 10,000 0%, 10,001+ 2%. *Share of counted environmental services companies in Washington in each employee range.* ## How do you reach the people at environmental services companies in Washington, DC? The people to talk to are usually owners, operations and business development leaders. Build the list in three prompts to your AI agent. ### 1. Count them (free) Counting who matches never uses credits. ```text Use www.enrich.chat to count the environmental services companies in Washington, DC ``` ### 2. Find the people (5 credits per person) Name the roles you sell to. Each person returned is 5 credits, and name, title and company are included. ```text Use www.enrich.chat to find the owners, operations and business development leaders at environmental services companies in Washington, DC, with their titles ``` ### 3. Get their work emails (10 credits each) An email is 10 credits only when one is found. Every email comes with a status: verified, catch-all or unknown. ```text Use www.enrich.chat to find the work emails for these people and tell me which ones are verified ``` ## More to explore Other industries in Washington, DC: [Nonprofit Organizations](https://enrich.chat/companies-in/washington-dc/non-profit-organizations/)[Consulting Firms](https://enrich.chat/companies-in/washington-dc/business-consulting-and-services/)[IT Services Companies](https://enrich.chat/companies-in/washington-dc/it-services-and-it-consulting/)[Real Estate Companies](https://enrich.chat/companies-in/washington-dc/real-estate/)[Software Companies](https://enrich.chat/companies-in/washington-dc/software-development/)[Hospitals and Health Care Organizations](https://enrich.chat/companies-in/washington-dc/hospitals-and-health-care/)[Law Firms](https://enrich.chat/companies-in/washington-dc/law-practice/)[Financial Services Companies](https://enrich.chat/companies-in/washington-dc/financial-services/)[Construction Companies](https://enrich.chat/companies-in/washington-dc/construction/)[Public Relations Firms](https://enrich.chat/companies-in/washington-dc/public-relations-and-communications-services/)[Advertising Agencies](https://enrich.chat/companies-in/washington-dc/advertising-services/)[Technology and Internet Companies](https://enrich.chat/companies-in/washington-dc/technology-information-and-internet/)[Legal Services Firms](https://enrich.chat/companies-in/washington-dc/legal-services/)[Education Organizations](https://enrich.chat/companies-in/washington-dc/education-administration-programs/)[Colleges and Universities](https://enrich.chat/companies-in/washington-dc/higher-education/)[Government Agencies](https://enrich.chat/companies-in/washington-dc/government-administration/)[Research Services Firms](https://enrich.chat/companies-in/washington-dc/research-services/)[Architecture Firms](https://enrich.chat/companies-in/washington-dc/architecture-and-planning/)[Training and Coaching Firms](https://enrich.chat/companies-in/washington-dc/professional-training-and-coaching/)[All of Washington, DC](https://enrich.chat/companies-in/washington-dc/) ## Frequently asked questions ### Which are the biggest environmental services companies in Washington, DC? Among those counted, they include Evoqua Water Technologies, Global Methane Initiative Gmi, Greenhouse Gas Protocol Ghg Protocol, US Environmental Protection Agency (EPA) and Verra, ranked by headcount range. ### How big are environmental services companies in Washington, DC? 74% of those counted have 50 or fewer employees, and the middle one is in the 11 to 50 range. Companies with fewer than 11 employees are not counted. ### Which companies count as environmental services? Companies whose public profile lists Environmental Services as their industry and whose headquarters are in Washington, DC. ## Try this prompt Find the people at environmental services companies in Washington, DC ```text Use www.enrich.chat to find the owners, operations and business development leaders at environmental services companies in Washington, DC, with titles and verified work emails ``` ## Related - [Companies using a technology](https://enrich.chat/companies-using/) - [Nonprofit Organizations in Washington, DC](https://enrich.chat/companies-in/washington-dc/non-profit-organizations/) - [Consulting Firms in Washington, DC](https://enrich.chat/companies-in/washington-dc/business-consulting-and-services/) - [IT Services Companies in Washington, DC](https://enrich.chat/companies-in/washington-dc/it-services-and-it-consulting/) - [Real Estate Companies in Washington, DC](https://enrich.chat/companies-in/washington-dc/real-estate/) - [Tech stack lookup](https://enrich.chat/tools/tech-stack-lookup/)