At ESSI we believe in engineering a better future together — delivering world-class water treatment expertise with the personal service your project deserves.
ESSI Consulting was established to bring drinking water systems world-class expertise on water quality and treatment — combining the depth found in large engineering firms with the responsiveness only a small firm can deliver.
Founded in 2022 and headquartered in Escondido, California, ESSI is licensed in California, Oregon, Washington, and North Carolina. Our team has designed or assisted in designing nearly 30 groundwater treatment plants across the West Coast, and has experience on more than 50 groundwater treatment projects.
From preliminary planning through construction support and operations optimization — ESSI delivers at every stage of your project lifecycle.
Civil and environmental engineer with nearly 15 years of experience in water treatment planning, design, and construction. Author of several technical journal publications and a committee member of the AWWA Water Treatment Group.
Mr. Gress has managed projects with multiple subcontracts across municipal and commercial water treatment — from preliminary design through construction support. His expertise spans arsenic, iron & manganese, PFAS, chromium, nitrate, and biological treatment systems.
His approach emphasizes simple, cost-effective designs that engage operators and owners throughout the process — so teams know exactly what to expect when the plant is complete.
We respond promptly to all inquiries. Whether you have a specific project in mind or want to learn more about our services, we'd love to hear from you.
We'll respond within one business day.