These Illinois-based companies focus on environmental services, ranging from water management to waste disposal and recycling. The list includes a mix of established large firms and mid-sized companies. Notable examples are Nalco Water, An Ecolab Company, a global leader in water and process management solutions, and Stericycle, which provides services for medical waste disposal. Other companies like Culligan International offer water filtration systems, while Crystal Clean specializes in environmentally sustainable waste disposal. Daniels Health provides medical waste management solutions, and LRS is a waste and recycling company.
A significant pattern observed is the concentration of headquarters in the Chicago metropolitan area, including Bannockburn, Rosemont, Hoffman Estates, and Naperville. This suggests a regional hub for environmental services within Illinois. The founding dates of these companies also span a wide range, from the Metropolitan Water Reclamation District of Greater Chicago, established in 1889, to several companies founded in the late 20th and early 21st centuries like LRS and Sims Lifecycle Services.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Nalco Water, An Ecolab Companyecolab.com
A global leader in water and process management solutions, leveraging connected chemistry and digital innovation to optimize sustainability and business outcomes |
12,751 | |||
| 2 |
Stericyclelinktr.ee
A leading compliance company providing essential services for proper disposal of medical waste and confidential information, protecting client relationships and the environment |
6,777 | |||
| 3 | 4,160 | ||||
| 4 |
Culligan Internationalculliganinternational.com
Provides advanced water filtration, softening, and treatment systems for homes and businesses through a vast global dealer network. |
2,191 | |||
| 5 |
Crystal Cleancrystal-clean.com
A national leader in environmental services, HCC operates a network of branches across the US, focusing on environmentally sustainable waste disposal and recycling |
1,375 | |||
| 6 |
Daniels Healthdanielshealth.com
A global leader in healthcare innovation, providing safer solutions for medical waste management, with a focus on sustainability and staff safety |
1,064 | |||
| 7 |
LRSlrsrecycles.com
A leading waste and recycling company providing integrated services to millions of residential and commercial customers across ten states in North America |
906 | |||
| 8 |
Metropolitan Water Reclamation District of Greater Chicagomwrd.org
Treating wastewater and managing stormwater to protect public health and the environment for Chicago and 128 suburban communities. |
906 | |||
| 9 |
Sims Lifecycle Servicessimslifecycle.com
Specializing in managing retired electronic equipment and components, this company provides secure IT asset disposition and data center decommissioning services |
874 | |||
| 10 |
City of Napervillenaperville.il.us
The company is located in Naperville, offering a variety of amenities such as top schools, a great library system, parks, and healthcare providers in a low-crime environment |
616 | |||
| 11 |
Clover Imaging Groupcloverimaging.com
A leading company specializing in collecting and remanufacturing printer cartridges, offering environmentally friendly supplies that reduce printing costs and environmental impact |
567 | |||
| 12 |
ENTACT, LLCentact.com
Specializing in environmental remediation, geotechnical infrastructure, and ground improvement projects, this company provides cost-effective, high-quality solutions with a focus on safety and innovation |
525 | |||
| 13 |
V3 Companiesv3co.com
An employee-focused organization that prioritizes career development and community service, offering meaningful and rewarding opportunities for growth and leadership |
518 | |||
| 14 |
UCC Environmentaluccenvironmental.com
Global leader in environmental solutions for solids handling, wastewater treatment, and pollution control in power generation and heavy industrial markets since 1920 |
433 | |||
| 15 |
SET Environmental, Inc.setenv.com
SET Environmental provides nationwide environmental management services with a focus on integrity, innovation, and excellence to address clients' unique hazardous concerns |
416 | |||
| 16 |
Baxter & Woodmanbaxterwoodman.com
A consulting engineering and technology firm providing sustainable solutions to municipalities and government agencies in multiple states, with a focus on community value |
392 | |||
| 17 |
Weaver Consultants Groupwcgrp.com
A customer-focused consulting firm providing project management, regulatory compliance, and business solutions to clients across the United States since 1991 |
380 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 18 |
City of Jolietjoliet.gov
A vibrant city in Illinois, home to 150,000 residents, thriving businesses, and attractions County seat of Will County Located 40 miles southwest of Chicago |
379 | |||
| 19 |
Utilities Inc.uiwater.com
Corix companies provide sustainable water, wastewater, and energy utility infrastructure solutions to enhance life and promote thriving communities in North America |
373 | |||
| 20 |
Pharma Logisticspharmalogistics.com
A leading provider of pharmaceutical reverse distribution services, helping healthcare organizations remove expired inventory, reduce risk, and lower healthcare costs |
329 | |||
| 21 |
Culligan By WaterCoculligan.com
A leader in water treatment systems for residential, commercial, and industrial use with over 80 years of experience and global presence |
326 | |||
| 22 |
City of Springfield Illinoisspringfield.il.us
A local government in Springfield, Illinois, known for its rich history, strong business environment, and diverse city departments serving residents and businesses |
319 | |||
| 23 |
Mahoney Environmentalmahoneyes.com
Leader in recycling Used Cooking Oil for restaurants nationwide, offering innovative solutions for oil collection and facility maintenance to optimize operations |
307 | |||
| 24 |
Mr. Bult's, Inc.mrbults.com
A leading provider of long-haul waste transportation services with a vast fleet of equipment, nationwide service footprint, and tailored solutions for reducing costs |
249 | |||
| 25 |
RainSoft – A division of Aquion, Inc.rainsoftdealer.com
A company since 1953 providing whole-house water treatment systems, training, support, and exclusive sales territories with no franchise fees |
240 | |||
| 26 |
City of Des Plainesdesplainesil.gov
The company provides residents and businesses in Des Plaines, IL with access to transportation, amenities, and a vibrant community |
225 | |||
| 27 | 214 | ||||
| 28 |
Fuel Tech, Inc.ftek.com
Fuel Tech provides cost-effective and sustainable multi-pollutant emissions control technologies and water treatment solutions including NOx reduction systems and dissolved oxygen infusion technology |
185 | |||
| 29 |
Caruscarusllc.com
A family-owned company based in Illinois, focused on producing products to clean air, water, and soil for a sustainable future |
183 | |||
| 30 |
Clover Wirelessreconext.com
Global leader in cost-effective supply chain solutions for wireless industry, offering repair, reclamation, trade-in, and buyback programs to maximize value and minimize waste |
183 | |||
| 31 |
Tradewatertradewater.co
A mission-driven B Corp specializing in reducing greenhouse gas emissions by developing high-value projects and creating top-quality carbon offset credits |
82 | |||
| 32 |
GROUPE ASTRADEC ENVIRONNEMENTastradec-environnement.fr
Collects and treats all types of waste. Offers comprehensive waste management solutions for various industries. Environmentally responsible approach. |
80 | |||
| 33 |
Full Circle Electronics - formerly Sipi Asset Recoveryfullcircleelectronics.com
End-to-end electronics recycling solutions provider with locations in the US, Mexico, and Colombia Specializes in secure, environmentally compliant IT asset decommissioning |
72 | |||
| 34 |
BESI USAbesiusa.com
A woman-owned company specializing in developing, designing, and deploying innovative renewable energy technologies for various industries and projects worldwide |
9 | |||
Turn this list into pipeline
Tamtam finds the decision-makers at every company on a list like this one, with verified emails, phone numbers and the buying signals that tell you when to reach out.
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 12, 2026.
More company lists in Illinois
- The largest companies in Illinois 4,687
- Multinational companies in Illinois 831
- Manufacturers in Illinois 528
- Education providers in Illinois 370
- Financial services firms in Illinois 352
- Professional services firms in Illinois 339
- Companies with in-house R&D in Illinois 322
- Hardware manufacturers in Illinois 296
- IT Services and IT Consulting companies in Illinois 294
- Hospitals and Health Care companies in Illinois 280
- IT services companies in Illinois 274
- Healthcare providers in Illinois 262
- Retail chains in Illinois 260
- Financial Services companies in Illinois 248
- Critical infrastructure operators in Illinois 241
- Consulting firms in Illinois 238
- Logistics companies in Illinois 228
- Transportation, Logistics, Supply Chain and Storage companies in Illinois 215
- SaaS companies in Illinois 182
- Companies with a mobile app in Illinois 178
- Family-owned companies in Illinois 166
- Subscription businesses in Illinois 160
- Corporate groups and holding companies in Illinois 154
- Publicly traded companies in Illinois 154
The same list elsewhere in United States
- Environmental services companies in Texas 98
- Environmental services companies in California 95
- Environmental services companies in Florida 58
- Environmental services companies in New York State 39
- Environmental services companies in North Carolina 37
- Environmental services companies in Pennsylvania 35
- Environmental services companies in Washington State 29
- Environmental services companies in Ohio 26
- Environmental services companies in Alabama 25