Rooted in Agriculture. Driven by Chemistry.
At Capacity Chemical, agriculture isn’t just our industry — it’s our heritage.
The Harvey family came to California during the Dust Bowl, drawn west by resilience and the promise of better land and opportunity. Since then, we have been deeply connected to California agriculture, working for generations at the intersection of chemistry, water, and soil health.
Our grandfather, Phil G. Harvey, founded Harvey Laboratories in Patterson, California, where innovation and integrity defined his work throughout the 1960s to 1980s. His son Mike Harvey carried that tradition forward, pioneering modern chemical applications for agriculture and industry, and later founding Enviro Tech Chemical Services, Inc. in Modesto — a national leader in food safety and sanitation chemistry until its acquisition by Arxada in 2021.
Today, brothers Phil H. Harvey and Aaron Harvey continue that legacy at Capacity Chemical in Westley, CA. We manufacture and supply specialty water-treatment and agricultural chemistries that help our distribution partners control scale, balance soil, and enhance water efficiency across the western United States.
Our work blends industrial precision with agricultural purpose — chemistry that performs reliably in the field and supports long-term sustainability from the ground up. Guided by generations of experience, we remain committed to the same principles our grandfather built his lab on:
Integrity. Technical mastery. Partnership.
From irrigation water treatment to sustainable soil chemistry, Capacity Chemical stands where service meets science — and where chemistry cultivates growth.
Our Locations
Plant 1: The Westley Site
Located in Westley, California, our facility occupies a piece of ground that has served California agriculture for nearly a century. Built in the early 1930s, the site was originally a warehouse and rail shipping point for Westside bean, hay, and grain crops, linking local growers to freight lines that carried their harvests across the country. Its proximity to the railroad made it a central hub for commodity transport and an enduring symbol of the region’s agricultural innovation and grit.
The town of Westley itself was laid out after the construction of the railroad by John Westley van Benschoten, a pioneer and member of John C. Fremont’s 1846 expedition to California. His legacy of enterprise and determination still defines the area today. Continuing that spirit, the Capacity Chemical Westley Site now serves as a modern manufacturing and distribution center for industrial water treatment and agricultural chemistry, carrying forward Westley’s long tradition of turning hard work and innovation into progress.
Warehouse 3: The Modesto Site
Warehouse 3 is located in Modesto’s historic Beard Industrial District, a center of industry and rail commerce that has supported California’s agricultural heartland for more than a century. Originally developed in the 1990s, the site features three modern industrial buildings designed for efficient storage, staging, and logistics operations, with high clearances, dock-high and grade-level access, and heavy-duty electrical capacity. Its position near Highway 99 and along the Modesto & Empire Traction Company rail line places it within one of the Central Valley’s most connected freight corridors — the same network that has powered Modesto’s food, beverage, and materials industries since 1911.
Surrounded by the legacy of companies such as Gallo, Del Monte, and Frito-Lay, Warehouse 3 continues the region’s tradition of practical innovation and reliable service. Today, it serves as a key distribution and logistics hub for Capacity Chemical, supporting the safe storage, handling, and movement of specialty water-treatment and agricultural chemistry products. From this location, the Harvey family’s commitment to precision, integrity, and long-term partnership remains rooted in the same Central Valley soil that has defined their story for generations.
Research & Development 2: The Oakdale Site
R&D 2 stands at the intersection of science, sustainability, and innovation in California agriculture. Located in Oakdale, this research and development facility serves as Capacity Chemical’s hub for exploring the future of water and soil treatment technologies.
Designed as a living laboratory, the site brings together advanced automation, environmental monitoring, and modern agronomic testing under one roof. Here, new chemistries and application methods are developed, refined, and validated in real-world growing environments.
R&D 2’s work centers on improving plant performance under challenging conditions — from salinity and drought to soil degradation and nutrient stress. Through partnerships with customers, growers, researchers, and equipment manufacturers, the facility also leads collaborative studies on irrigation maintenance and system rescue, advancing practical solutions that keep water infrastructure efficient and productive.
With its blend of field realism and scientific precision, the Oakdale R&D Facility embodies Capacity Chemical’s commitment to innovation, resilience, and sustainable progress in agriculture.