Warminster Fiberglass has served the water and wastewater industry for more than six decades.
Founded in 1958, the company has continually earned the trust of municipalities, engineers, and contractors through dependable fiberglass-reinforced plastic (FRP) products and consistent, responsive service.
Ownership has changed over the years, but the reputation behind the Warminster name has remained a constant in the industry.
Every product we manufacture—whether a shelter, enclosure, or wastewater treatment component—is designed to perform in corrosive, high-moisture, and chemically aggressive environments.
Our FRP materials are lightweight, strong, and resistant to corrosion, making them ideal for long-term municipal and industrial use.


We pride ourselves on communication, speed, and accountability. Customers receive quick, thorough replies, and every request is reviewed by multiple team members to ensure nothing gets overlooked.
Our lead times are consistently shorter than many competitors, and our team is always available to help interpret project requirements or coordinate with engineers.
Most projects require some degree of customization—and that’s where we excel.
Our shelters and wastewater components can be tailored to meet project needs, including:
Whether working from a complete engineering package or a general concept, we build to match the design intent with accuracy and consistency.


Quality and compliance are essential in municipal and industrial environments. Our products incorporate:
These standards ensure our FRP products meet the expectations of engineers, inspectors, and regulatory requirements across the country.
Our mission has remained steady since the beginning: manufacture dependable FRP solutions, support our customers with exceptional service, and contribute to water and wastewater systems built for longevity.
Whether supplying shelters, enclosures, or the specialized components inside treatment plants, Warminster Fiberglass is dedicated to delivering products that perform for decades.