Jobs › Ecolab

Field Service Representative

Ecolab · Glenwood, IL · $59,500–$89,300 a year · Full time

Posted Sep 30, 2026 · We last checked this listing on Oct 6, 2026

Apply at Ecolab

Likely interview questions for this role

Written from this job description, not a generic list. Each one notes what the interviewer is really checking.

About your past

Tell me about a time you ran into a problem in the field that you couldn't solve yourself. How did you decide when to escalate?

What they are checking: Whether they know their limits and escalate at the right time instead of guessing or waiting too long.

You work alone most days. How do you keep your schedule, inventory and data logs on track?

What they are checking: Whether they are organized and self-directed enough to work in the field without close supervision.

Tell me about a time you suggested a better way of doing things to a customer.

What they are checking: Whether they promote best practices in a helpful way that customers actually accept.

What would you do

A customer asks you to skip a safety step so you can finish faster. What do you say?

What they are checking: Whether they will hold safety rules firmly even when a customer pressures them.

How would you explain a test result that's out of range to a plant manager who isn't a chemist?

What they are checking: Whether they can communicate clearly and build trust with customers who rely on their expertise.

You show up for a service visit and the equipment you need is not working. What do you do?

What they are checking: Whether they stay calm, find a workable solution and communicate honestly with the customer about the delay.

About the work

Walk me through how you would clean and disinfect a cooling tower. What safety steps come first?

What they are checking: Whether they know the actual process and the hazards involved, like chemical handling and confined spaces.

Why does Legionella control matter in cooling towers, and what are you looking for when you test the water?

What they are checking: Whether they understand the public health reason behind the work rather than just following a checklist.

What water chemistry tests have you run before, and how did you make sure your results were accurate?

What they are checking: Whether they have real testing experience and take care with readings that customers rely on.

What do you know about handling and storing water treatment chemicals safely?

What they are checking: Whether they understand chemical safety basics like labeling, compatibility and protective equipment.

Practice this interview out loud.

Offer builds a real interview for this exact role at Ecolab from your resume and this job description, asks the questions one at a time, and tells you what landed. The first one is free.

Practice this out loud

The full job description

As published by Ecolab.

Want to build a brighter, bolder future and cultivate your career? Join Ecolab’s team and help create a world in which we all thrive. Nalco Water, an Ecolab company, helps customers conserve more than 161 billion gallons of water annually. We serve industries from food & beverage to mining and manufacturing, delivering innovative solutions that reduce, reuse, and recycle water while protecting systems and equipment. Our team combines deep technical expertise with smart technology to drive efficiency, sustainability, and performance. Ecolab is seeking a Field Service Representative where your hands-on skills and customer-first mindset will help shape a more sustainable future. You’ll be part of a purpose-driven team that supports water treatment and disinfection systems across a variety of industries. You’ll work independently in the field, building trusted relationships with customers and delivering solutions that protect vital resources and improve operational performance. How You’ll Make an Impact: • Deliver expert service and support for cooling tower cleaning and water disinfection • Provide technical support and escalate complex challenges as needed • Build strong relationships with customers and promote best practices • Ensure full compliance with safety policies and procedures • Execute required chemistry tests, log and report data, and maintain product inventories at customer accounts • Provide routine service support to Sales Representatives in strategic district accounts to execute agreed upon customer system assurance plans • Provide technical support to customers; identifying and resolving customer pain points, escalating as required Position Details: • This position will be based in Glenwood, IL • The territory for this position covers a 100 mile radius • Targeted accounts are within the global high tech, downstream, etc. industries What’s Unique About This Role: • You’ll work in a dynamic, hands-on environment with autonomy and support • You’ll help customers meet sustainability goals while protecting their critical assets • You’ll gain access to industry-leading training and development programs Minimum Qualifications: • High school diploma or equivalent • 2 years of experience in water treatment or an industrial/mechanical environment • Position requires a current and valid Driver’s License with no restrictions • No immigration sponsorship available for this position Physical Requirements of Position: • Lifting up to 50 pounds • Exposure to hot, cold, noisy, or dirty environments • Stooping, kneeling, crouching, reaching, balancing, walking, standing, climbing Ecolab is committed to providing reasonable accommodation to qualified individuals with a disability. Preferred Qualifications: • Associate’s degree or trade school certification • Demonstrated mechanical aptitude • Experience in water treatment or specialty chemical industry • Familiarity with boilers, cooling towers, and wastewater treatment systems • Proficiency with Microsoft Office Suite What’s in it For You: • Starting on Day 1 : Access to our comprehensive benefits package including medical, dental, vision, matching 401K, company-paid pension, stock purchase plan, paid parental leave, select discounted childcare resources, and more! • The opportunity to take on some of the world’s most meaningful challenges, helping customers achieve clean water, safe food, and healthy environments. • The ability to make an impact and shape your career with a company that is passionate about growth. • The support of an organization that believes it is vital to include and engage diverse people, perspectives, and ideas to achieve our best. ​ About Ecolab: At Ecolab, we prioritize our talent-first philosophy by creating the most capable and diverse team to excel at our nearly three million customer sites. Building on a century of innovation, our 48,000 associates help deliver comprehensive science-based solutions, data-driven insights and world-class service to advance food safety, maintain clean and safe environments, and optimize water and energy use, and improve operational efficiencies and sustainability for customers in the food, healthcare, life sciences, hospitality and industrial markets in more than 170 countries around the world. Our solutions not only enhance operational efficiency but also contribute to sustainability and public health, making a positive impact on the world. We are committed to eliminating unnecessary complexities and embracing a beginner's mindset, continuously seeking new perspectives and innovative solutions to stay ahead in a rapidly changing world. Annual or Hourly Compensation Range The pay range for this position is $59,500-$89,300. Many factors are taken into consideration when determining compensation, such as experience, education, training, geography, etc. We comply with all minimum wage and overtime laws. Benefits Ecolab strives to provide comprehensive and market-competitive benefits to meet the needs of our associates and their families. Click here to see our benefits. If you are viewing this posting on a site other than our Ecolab Career website, view our benefits at jobs.ecolab.com/working-here. Potential Customer Requirements Notice To meet customer requirements and comply with local or state regulations, applicants for certain customer-facing roles may need to: - Undergo additional background screens and/or drug/alcohol testing for customer credentialing. Americans with Disabilities Act (ADA) Ecolab will provide reasonable accommodation (such as a qualified sign language interpreter or other personal assistance) with our application process upon request as required to comply with applicable laws. If you have a disability and require accommodation assistance in this application process, please visit the Recruiting Support link in the footer of each page of our career website.

Apply at Ecolab

More field service representative roles