Koester covers all of New York State – including Long Island, Northern New Jersey and Canada for sales, application, implementation, and servicing of water and wastewater.


From actuators and blower to pumps and valve vaults, Koester has the right equipment to meet your water and wastewater needs. We represent over 40 leading manufacturers and continually search for new and evolving technologies to offer our customers.Learn More


Koester maintains an inventory, and has access to a comprehensive range of OEM and compatible parts to get you back in business as quickly as possible because we know how critical it is to you and your operations.Learn More


Whether it’s a failed pump, a chemical feed system malfunction or a sludge dewatering issue that occurs in the middle of the night, our commitment is to help relieve and eliminate your problem.Learn More


Equipment ages, becomes obsolete, or new and improved technology comes along. Koester has been retrofitting equipment for more than half a century and is ready to assist you to meet your specific needs.Learn More

Resources & News

Corporate Brochure
To assist municipalities, engineers, contractors and maintenance personnel in selecting equipment and solutions for water and wastewater, Koester provides several downloadable resources. View Now
Line Card
Koester Associates Partners with Bilfinger Airvac® View Now

What Customers Say

“Your company is great to deal with. You have great service and handle everything with utmost professionalism.”
“We appreciate the progressive thinking and commitment to customers that is constantly exhibited by Koester employees.”