Excavation Contractor Services

Emergency Services Available

Free Site Assessments

One-Year Workmanship Warranty

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Your Local Excavation Specialists


Koster Excavating LLC, a family-owned and owner-operated excavation contractor, has been serving Jefferson County, Lewis County, and St. Lawrence County, NY since 2004. With over 40 years of experience in the industry, we pride ourselves on our knowledgeable team, quick response times, and our ability to go above and beyond for our customers.


Our reputation is built on the trust and loyalty of our many repeat customers, who appreciate our personable, friendly staff and the owner's presence on-site for every job. To get started on any excavation project, contact us today. We provide free estimates and free site assessments. Emergency services are available!

Why Choose Koster Excavating?


Choosing Koster Excavating means choosing a local, owner-operated company with a stellar reputation. Our customers choose us for our friendly, knowledgeable team, our quick response times, and our commitment to going above and beyond for your excavation needs.


We are fully licensed and insured, and our team is certified to install Eljen septic systems. We start every job with a walkthrough, providing free estimates and site assessments to ensure we understand your needs and can provide the best service possible. Our owner will be there to support you during the process.


Our competitive prices and one-year workmanship warranty make us a reliable choice for your excavation needs. At Koster Excavating, our reputation speaks for itself. Contact us today to get started!

Personable, Friendly Staff

Fully Licensed and Insured

Quick Response Times

Certified for Eljen Septic Systems

Free Estimates

Over 40 Years of Experience

Complete Site Work

At Koster Excavating, we offer comprehensive site work services. From initial site assessments to final grading, our experienced team ensures every aspect of your project is handled with the utmost professionalism and expertise.

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Retaining Wall Services

Our retaining wall services are designed to enhance the functionality and aesthetics of your property. We use high-quality materials and proven techniques to create durable, attractive retaining walls. Get a free estimate today!

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Pond Installations

We specialize in pond installations, creating beautiful, functional water features that enhance your property's value and enjoyment. Our team handles every step of the process, from design to excavation to final touches.

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Spring Wells

Our spring well services ensure you have a reliable, clean water source. We use state-of-the-art equipment and methods to install and maintain spring wells, ensuring optimal performance. Let us give you a free site assessment today.

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Septic Systems

As certified installers of Eljen septic systems, we provide top-quality septic system services. From installation to maintenance, we ensure your system operates efficiently and effectively. Emergency service is available for pressing needs that can't wait.

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Farmland Improvements

We offer a range of farmland improvement services, designed to enhance productivity and value. From drainage solutions to land preparation, we provide expert services tailored to your farm's unique needs. Ask about our competitive pricing!

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Here's what our satisfied customers are saying...

At Koster Excavating LLC, we take pride in providing exceptional excavation services to our customers. We would be grateful if you could share your thoughts about our business with others. Your feedback helps us improve and helps others make informed decisions. Please take a moment to leave a review of Koster Excavating LLC and let others know what you think.

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Koster Excavating LLC

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