# Top 50 Environmental Services companies in California

Tamtam tracks 74 Environmental Services companies headquartered in California. This list ranks the 50 largest by number of employees on LinkedIn, led by Brown and Caldwell, Carollo Engineers and Partner Engineering & Science, Inc.. Their median headcount is 387. Half of them were founded in 1991 or later. The most common headquarters are San Francisco (8), Sacramento (3) and Walnut Creek (3).

The companies listed in California primarily operate in environmental services, offering a range of consulting, engineering, and management solutions. These are mostly large, established firms, many of which are privately held or public agencies.

Key companies include Brown and Caldwell, specializing in water and environmental sectors; Carollo Engineers, focused exclusively on water-related engineering; Rain For Rent, providing temporary liquid handling solutions; and Recology, offering waste collection, recycling, and composting services. A notable pattern is the presence of several public agencies, such as the State Water Resources Control Board and Los Angeles County Sanitation Districts, indicating a significant public sector involvement in environmental management.

🇺🇸 California · 50 companies · Updated Nov 14, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Brown and Caldwell](https://www.tamtam.ai/c/brown-and-caldwell) (brownandcaldwell.com)<br>Privately-held environmental firm specializing in US water and environmental sectors Offering engineering, scientific, consulting, and construction services globally Passionate about innovation and service excellence | Environmental Services | 🇺🇸 Walnut Creek | 2,556 | 1947 |
| 2 | [Carollo Engineers](https://www.tamtam.ai/c/carollo-engineers) (carollo.com)<br>Specializing solely in water related engineering, we provide innovative solutions, unparalleled client service, and a collaborative working environment since 1933 | Environmental Services | 🇺🇸 Walnut Creek | 1,803 | 1933 |
| 3 | [Partner Engineering & Science, Inc.](https://www.tamtam.ai/c/partner-engineering-and-science-inc) (partneresi.com)<br>National firm providing engineering, environmental, and energy consulting services, from due diligence to design, construction, maintenance, and compliance in various industries | Environmental Services | 🇺🇸 Torrance | 1,438 | 2007 |
| 4 | [Rain For Rent](https://www.tamtam.ai/c/rain-for-rent) (rainforrent.com)<br>Provider of temporary liquid handling solutions through pumps, tanks, filtration, and spill containment for flood relief, construction dewatering, sewer bypasses, and turnarounds. | Environmental Services | 🇺🇸 Bakersfield | 1,386 | 1934 |
| 5 | [State Water Resources Control Board](https://www.tamtam.ai/c/state-water-resources-control-board) (waterboards.ca.gov)<br>The company works under the California Environmental Protection Agency to preserve, enhance, and restore water quality for environmental protection and public health | Environmental Services | 🇺🇸 Sacramento | 1,377 |  |
| 6 | [Recology](https://www.tamtam.ai/c/recology) (recology.com)<br>Recology provides waste collection, recycling, and composting services in multiple states, prioritizing sustainability, employee ownership, and customer satisfaction | Environmental Services | 🇺🇸 San Francisco | 1,306 | 1920 |
| 7 | [SCS Engineers](https://www.tamtam.ai/c/scs-engineers) (scsengineers.com)<br>Environmental solutions provider with expertise in compliance, technology, consulting, engineering, construction, O&M, monitoring, and compliance for private and public sector clients | Environmental Services | 🇺🇸 Long Beach | 1,278 | 1970 |
| 8 | [Blackstone Consulting, Inc.](https://www.tamtam.ai/c/blackstone-consulting-inc) (blackstone-consulting.com)<br>A minority-owned company providing environmental, security, facilities maintenance, staffing, and food service management services to national and international clients since 1991 | Environmental Services | 🇺🇸 Los Angeles | 1,091 | 1991 |
| 9 | [Resource Innovations](https://www.tamtam.ai/c/resource-innovations) (resource-innovations.com)<br>A women-led energy transformation focused on clean energy solutions, specializing in energy efficiency and guiding utilities through complex challenges | Environmental Services | 🇺🇸 Half Moon Bay | 1,072 | 2016 |
| 10 | [Los Angeles County Sanitation Districts](https://www.tamtam.ai/c/los-angeles-county-sanitation-districts) (lacsd.org)<br>The company provides wastewater and solid waste management services, converting waste into resources like reclaimed water, energy, and recycled materials | Environmental Services | 🇺🇸 Whittier | 997 | 1923 |
| 11 | [California Department of Toxic Substances Control](https://www.tamtam.ai/c/california-department-of-toxic-substances-control) (dtsc.ca.gov)<br>Protecting California's people and environment from harmful effects of toxic substances by enforcing laws, reducing waste generation, and promoting chemically safer products | Environmental Services | 🇺🇸 Sacramento | 919 |  |
| 12 | [Dudek](https://www.tamtam.ai/c/dudek) (dudek.com)<br>Employee-owned firm with 800+ environmental and engineering professionals nationwide, specializing in improving infrastructure and natural environment for public and private clients since 1980 | Environmental Services | 🇺🇸 Encinitas | 850 | 1980 |
| 13 | [SCS Global Services](https://www.tamtam.ai/c/scs-global-services) (scsglobalservices.com)<br>Trusted leader in third-party environmental, sustainability, and food quality certification, auditing, testing, and standards development, driving practices for sustainable development worldwide | Environmental Services | 🇺🇸 Emeryville | 762 | 1984 |
| 14 | [Environmental Science Associates](https://www.tamtam.ai/c/environmental-science-associates) (esassoc.com)<br>Employee-owned environmental consulting firm with expertise in planning, design, permitting, mitigation, restoration, and compliance for diverse projects across various regions | Environmental Services | 🇺🇸 San Francisco | 746 | 1969 |
| 15 | [South Coast Air Quality Management District](https://www.tamtam.ai/c/south-coast-air-quality-management-district) (aqmd.gov)<br>Regulatory agency in Southern California working to improve air quality by controlling emissions from stationary sources and advocating for public health | Environmental Services | 🇺🇸 Diamond Bar | 740 |  |
| 16 | [Athens Services](https://www.tamtam.ai/c/athens-services) (athensservices.com)<br>Family-owned waste collection & recycling company serving 275,000+ customers in greater Los Angeles area with focus on sustainability & community investment | Environmental Services | 🇺🇸 City of Industry | 702 | 1957 |
| 17 | [FCS](https://www.tamtam.ai/c/fcs) (firstcarbonsolutions.com)<br>Leading provider of environmental, sustainability, and compliance solutions with expertise in CEQA/NEPA, compliance, permitting, natural resources management, and more Join our team! | Environmental Services | 🇺🇸 Irvine | 613 | 1982 |
| 18 | [LSA](https://www.tamtam.ai/c/lsa) (lsa.net)<br>A diversified environmental, transportation, and community planning firm offering expert services in various fields, operating across nine California offices | Environmental Services | 🇺🇸 Irvine | 582 | 1976 |
| 19 | [Mill](https://www.tamtam.ai/c/mill) (mill.com)<br>Innovative system to help individuals reduce household waste and odors, promoting smarter waste management practices for a cleaner environment | Environmental Services | 🇺🇸 San Bruno | 550 |  |
| 20 | [JJ&S Environmental Services](https://www.tamtam.ai/c/jj-and-s-environmental-services) (jjandsenvironmental.com)<br>The company specializes in large-scale remodeling and emergency projects, particularly water or fire damage, with a focus on transparent pricing and accepting any project | Environmental Services | 🇺🇸 Anaheim | 529 | 2013 |
| 21 | [Rincon Consultants](https://www.tamtam.ai/c/rincon-consultants) (rinconconsultants.com)<br>Provides environmental sciences, planning, and engineering consulting services, offering solutions for environmental planning, biological resources, cultural resources, water, site assessment, and sustainability. | Environmental Services | 🇺🇸 Ventura | 524 | 1994 |
| 22 | [Citizens'​ Climate Lobby](https://www.tamtam.ai/c/citizens-climate-lobby) (citizensclimatelobby.org)<br>Educating and training individuals to lobby lawmakers for environmental causes; nonpartisan, nonprofit, grassroots organization | Environmental Services | 🇺🇸 Coronado | 491 | 2007 |
| 23 | [Environmental Services](https://www.tamtam.ai/c/environmental-services) (envirosvs.com)<br>A multi-functional company offering inspection, remediation, and restoration services for indoor air quality issues, mold, allergens, and property-related problems | Environmental Services | 🇺🇸 San Francisco | 448 | 1993 |
| 24 | [AEI Consultants](https://www.tamtam.ai/c/aei-consultants) (aeiconsultants.com)<br>A company offering building, environmental, land, and sustainability consulting services across North America, working with various players in real estate industry | Environmental Services | 🇺🇸 Walnut Creek | 444 | 1992 |
| 25 | [Bay Area Air Quality Management District](https://www.tamtam.ai/c/bay-area-air-quality-management-district) (baaqmd.gov)<br>Regional agency regulating air pollution in San Francisco Bay Area, promoting healthy breathing environment through science-based policies, leadership, collaboration, and equity | Environmental Services | 🇺🇸 San Francisco | 387 | 1955 |
| 26 | [American Leak Detection](https://www.tamtam.ai/c/american-leak-detection) (americanleakdetection.com)<br>Specializing in non-destructive detection, the company accurately and efficiently identifies hidden water, sewer, and gas leaks in various types of buildings worldwide | Environmental Services | 🇺🇸 Palm Springs | 386 | 1974 |
| 27 | [Burrtec Waste](https://www.tamtam.ai/c/burrtec-waste) (burrtec.com)<br>A leading waste management company in California, providing top-notch service to industrial, commercial, municipal, and residential customers for over 50 years | Environmental Services | 🇺🇸 Fontana | 350 |  |
| 28 | [Golden Gate National Parks Conservancy](https://www.tamtam.ai/c/golden-gate-national-parks-conservancy) (parksconservancy.org)<br>Nonprofit partner supporting the Golden Gate National Recreation Area through collaboration, awareness building, volunteer opportunities, and education, connecting people to parks | Environmental Services | 🇺🇸 San Francisco | 346 | 1981 |
| 29 | [CR&R Incorporated](https://www.tamtam.ai/c/cr-and-r-incorporated) (crrwasteservices.com)<br>Innovative environmental recycling collection company serving millions of people and thousands of businesses in Southern California counties | Environmental Services | 🇺🇸 Stanton | 345 | 1963 |
| 30 | [Picarro](https://www.tamtam.ai/c/picarro) (picarro.com)<br>This company designs and manufactures precision instruments for various applications, utilizing cavity ring-down spectroscopy technology for global deployment and reliability | Environmental Services | 🇺🇸 Santa Clara | 313 | 1997 |
| 31 | [ACTenviro, a Republic Services Company](https://www.tamtam.ai/c/actenviro-a-republic-services-company) (actenviro.com)<br>An employee-owned environmental management company providing hazardous waste management, recycling, treatment, and compliance services throughout the western United States | Environmental Services | 🇺🇸 San Jose | 302 | 2000 |
| 32 | [3Degrees Group, Inc.](https://www.tamtam.ai/c/3degrees-group-inc) (3degreesinc.com)<br>This company helps businesses achieve renewable energy and decarbonization goals by providing sustainability consulting and environmental market solutions worldwide | Environmental Services | 🇺🇸 San Francisco | 292 | 2007 |
| 33 | [GreenWaste](https://www.tamtam.ai/c/greenwaste) (greenwaste.com)<br>An industry leader in recycling and waste diversion, specializing in material collection, processing, and sales with a focus on environmental sustainability and innovation | Environmental Services | 🇺🇸 San Jose | 222 | 1991 |
| 34 | [California Coastal Commission](https://www.tamtam.ai/c/california-coastal-commission) (coastal.ca.gov)<br>The company is dedicated to safeguarding and improving California's coast and ocean through sustainable development, science-based regulation, public engagement, education, and coordination | Environmental Services | 🇺🇸 San Francisco | 193 | 1972 |
| 35 | [TreePeople](https://www.tamtam.ai/c/treepeople) (treepeople.org)<br>This organization in Los Angeles focuses on utilizing trees and nature-based solutions to address climate change impacts, engaging communities for a greener city | Environmental Services | 🇺🇸 Beverly Hills | 170 | 1973 |
| 36 | [Ascent](https://www.tamtam.ai/c/ascent-sacramento) (ascent.inc)<br>A collaborative company solving unprecedented challenges through planning, design, science, and kindness with offices across multiple cities and a focus on a caring work environment | Environmental Services | 🇺🇸 Sacramento | 169 | 2010 |
| 37 | [ECORP Consulting, Inc.](https://www.tamtam.ai/c/ecorp-consulting-inc) (ecorpconsulting.com)<br>Environmental consulting firm offering full service capability for regulatory compliance, environmental planning, permit negotiation, and mitigation design to public and private land owners since 1987 | Environmental Services | 🇺🇸 Rocklin | 166 | 1987 |
| 38 | [Terraphase Engineering Inc.](https://www.tamtam.ai/c/terraphase-engineering-inc) (terraphase.com)<br>Environmental and engineering consulting firm providing cost-effective solutions, technical expertise, and regulatory compliance to achieve clients' project goals | Environmental Services | 🇺🇸 Oakland | 165 | 2010 |
| 39 | [Geo-Logic Associates, Inc.](https://www.tamtam.ai/c/geo-logic-associates-inc) (geo-logic.com)<br>Employee-owned consulting firm offering multidisciplinary services in engineering, geology, hydrogeology, environmental compliance, and water resources for various projects across 27 US locations | Environmental Services | 🇺🇸 Ontario | 163 | 1991 |
| 40 | [Beewise](https://www.tamtam.ai/c/beewise) (beewise.ag)<br>This company designs modern beehives to prioritize the well-being and longevity of bees, providing a healthier and more natural living environment | Environmental Services | 🇺🇸 San Ramon | 160 | 2018 |
| 41 | [SEI](https://www.tamtam.ai/c/sei-san-rafael) (seiinc.org)<br>Environmental nonprofit building leaders for sustainability solutions through programs in schools, communities, and businesses to create thriving, resilient communities | Environmental Services | 🇺🇸 San Rafael | 159 | 1997 |
| 42 | [Heirloom](https://www.tamtam.ai/c/heirloom) (heirloomcarbon.com)<br>Developing cost-effective DAC technology to remove CO2 from the atmosphere quickly First facility in North America capturing CO2 for major clients like Microsoft | Environmental Services | 🇺🇸 San Francisco | 158 | 2020 |
| 43 | [ArborWorks, LLC](https://www.tamtam.ai/c/arborworks-llc) (arborworksinc.com)<br>Vegetation management and wildfire hazard mitigation services for various sectors, accredited by industry organizations, with expertise in tree care and forestry | Environmental Services | 🇺🇸 Oakhurst | 152 | 2003 |
| 44 | [Alliance Environmental Group, LLC.](https://www.tamtam.ai/c/alliance-environmental-group-llc) (alliance-enviro.com)<br>A leading environmental specialist in California, offering services including asbestos, mold, and lead removal, air duct cleaning, and trauma scene cleanup | Environmental Services | 🇺🇸 Azusa | 150 | 1995 |
| 45 | [Verdani Partners](https://www.tamtam.ai/c/verdani-partners) (verdani.com)<br>A sustainability consulting firm specializing in greening existing buildings, LEED certification, and corporate sustainability strategies, empowering organizations to create regenerative buildings and communities | Environmental Services | 🇺🇸 Carlsbad | 82 | 2012 |
| 46 | [Partner Energy](https://www.tamtam.ai/c/partner-energy) (ptrenergy.com)<br>Provide energy efficiency engineering, sustainability, ESG consulting, project financing expertise, and support for renewable energy and incentive programs nationwide. | Environmental Services | 🇺🇸 Los Angeles | 57 | 2009 |
| 47 | [Rubicon Carbon](https://www.tamtam.ai/c/rubicon-carbon) (rubiconcarbon.com)<br>A next-generation carbon solutions provider delivering at-scale decarbonization projects and enterprise-grade solutions for carbon credit purchases | Environmental Services | 🇺🇸 Marina Del Rey | 49 | 2022 |
| 48 | [EnerPath](https://www.tamtam.ai/c/enerpath) (enerpath.com)<br>EnerPath helps businesses and communities save energy by offering a transparent, real-time delivery platform with proven products and services | Environmental Services | 🇺🇸 Redlands | 46 |  |
| 49 | [AWR](https://www.tamtam.ai/c/awr) (datasdy.site)<br>Environmental consulting firm specializing in resolving contamination and water resource issues for government, industry, and developers through a range of services Email for more information | Environmental Services | 🇺🇸 Alameda | 44 | 1997 |
| 50 | [Eurofins Air Toxics, Inc.](https://www.tamtam.ai/c/eurofins-air-toxics-inc) (airtoxics.com)<br>An ISO 17025 accredited air testing laboratory specializing in EPA, CARB, and ASTM methods, serving public and private sector clients | Environmental Services | 🇺🇸 Folsom | 32 | 1989 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 14, 2026.

## More company lists in California

- [The largest companies in California](https://www.tamtam.ai/l/largest-companies-california) (15,258)
- [Multinational companies in California](https://www.tamtam.ai/l/multinational-companies-california) (2,587)
- [SaaS companies in California](https://www.tamtam.ai/l/saas-companies-california) (1,854)
- [Software Development companies in California](https://www.tamtam.ai/l/software-development-companies-california) (1,649)
- [AI companies in California](https://www.tamtam.ai/l/ai-companies-california) (1,296)
- [Companies with in-house R&D in California](https://www.tamtam.ai/l/r-and-d-companies-california) (1,272)
- [Manufacturers in California](https://www.tamtam.ai/l/manufacturers-california) (1,065)
- [Hardware manufacturers in California](https://www.tamtam.ai/l/hardware-companies-california) (984)
- [IT Services and IT Consulting companies in California](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-california) (968)
- [Education providers in California](https://www.tamtam.ai/l/education-companies-california-united-states) (950)
- [Subscription businesses in California](https://www.tamtam.ai/l/subscription-businesses-california) (939)
- [Venture capital and private equity firms in California](https://www.tamtam.ai/l/vc-and-private-equity-firms-california) (917)
- [Professional services firms in California](https://www.tamtam.ai/l/professional-services-firms-california) (880)
- [Companies with a mobile app in California](https://www.tamtam.ai/l/companies-with-mobile-app-california) (827)
- [Retail chains in California](https://www.tamtam.ai/l/retail-chains-california) (802)
- [IT services companies in California](https://www.tamtam.ai/l/it-services-companies-california) (796)
- [Venture Capital and Private Equity Principals companies in California](https://www.tamtam.ai/l/venture-capital-and-private-equity-principals-companies-california) (731)
- [Financial services firms in California](https://www.tamtam.ai/l/financial-services-firms-california) (711)
- [Financial Services companies in California](https://www.tamtam.ai/l/financial-services-companies-california) (642)
- [Healthcare providers in California](https://www.tamtam.ai/l/healthcare-providers-california) (569)
- [AI-native companies in California](https://www.tamtam.ai/l/ai-native-companies-california) (561)
- [Hospitals and Health Care companies in California](https://www.tamtam.ai/l/hospitals-and-health-care-companies-california) (555)
- [Consulting firms in California](https://www.tamtam.ai/l/consulting-firms-california) (551)
- [Public sector organisations in California](https://www.tamtam.ai/l/public-sector-organisations-california) (536)

## The same list elsewhere in United States

- [Environmental Services companies in the United States](https://www.tamtam.ai/l/environmental-services-companies-united-states) (534)
- [Environmental Services companies in New York State](https://www.tamtam.ai/l/environmental-services-companies-new-york-state) (48)
- [Environmental Services companies in Texas](https://www.tamtam.ai/l/environmental-services-companies-texas-united-states) (44)
- [Environmental Services companies in Florida](https://www.tamtam.ai/l/environmental-services-companies-florida-united-states) (28)
- [Environmental Services companies in Pennsylvania](https://www.tamtam.ai/l/environmental-services-companies-pennsylvania-united-states) (27)

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Source: https://www.tamtam.ai/l/environmental-services-companies-california