ESI'S High-Grade Rain Harvesting Systems
Rainwater harvesting systems engineered to drinking water standards
Most rainwater harvesting systems collect water and use it for non-potable requirements. ESI treats every gallon to potable standards, giving facilities, mission-critical operations, and water-stressed environments genuine water independence.
Proof over pitch. Every time.
So the solution is clear.
Facts & Figures of Choosing the Wrong Rainwater Harvest System
up to $30
Per Gallon
The cost of potable water delivery without a system that can treat to potable standards.
122 Million
Americans on Vulnerable Water Systems.
Over 1/3 of the US population relies on water systems that have violated safety standards at least once with 2000 US communities facing drinking water crises or active violations.
0
Other Contractors
Offer potable-standard rainwater harvesting systems for military installations. Every vendor in this category stops at non-potable reuse. ESI is the only rainwater harvesting company that has engineered a path to drinking water quality.
100%
Of Captured Water
Treated to potable standards in every ESI rain harvest system. Where other vendors deliver water suitable for flushing, ESI delivers water suitable for drinking. That distinction defines the category.
When a facility or community has no independent potable source and external supply is disrupted, operations stop and people are at risk. ESI exists to make sure that disruption never happens. Here is how...
THE ESI ADVANTAGE
ESI's rain harvesting systems are built to the potable standard that regulated facilities and mission-critical operations require, not just a collection-and-reuse system adapted after the fact.
ESI's systems integrate roof collection infrastructure, above-ground cistern storage, advanced multi-stage filtration, and solar power for fully off-grid operation. Every system treats captured rainwater to potable drinking water standards, including the stringent requirements of state health departments and federal environmental agencies. Real-time remote telemetry monitors water quality, flow rates, and system performance continuously.
ESI is the original equipment manufacturer behind one of the US Army's most recognized water resiliency programs. Selected by Pacific Northwest National Laboratory as the design and manufacturing partner, ESI has designed, built, deployed, and maintained potable-standard rain harvest systems for a US Army installation through hurricanes, grid failures, and nearly a decade of continuous expansion. We are not aware of another company in this category that has built a comparable record.
Every ESI rain harvest system operates on solar power, ensuring continued water production during grid failures caused by hurricanes, natural disasters, or prolonged utility outages. For facilities where water independence is a disaster preparedness requirement, off-grid capability significantly reduces risk.
ESI designs every rainwater harvesting system from site-specific water sampling data, the particulars of the facility that the system needs to service and the drinking water standards of that local jurisdiction. Systems are standardized into four scalable sizes and deployed in transportable ISO container platforms, enabling rapid installation across single facilities or entire installations. The engineering reflects the exact water demand, collection surface area, and regulatory standards of each specific site.
ESI standardized its rain harvest systems into four scalable sizes, each deployable in transportable ISO container platforms. From a single facility pilot to a multi-building installation-wide program, ESI's system architecture scales to the mission without requiring custom engineering from scratch at every expansion. For much larger requirements any size configuration can be integrated together for a larger capacity.
Every ESI rain harvest system includes integrated remote telemetry that tracks water quality, flow rates, storage levels, system performance, and any critical alarm parameters in real time. Facility managers and operations teams have continuous visibility into system status without requiring on-site inspections for routine monitoring. Problems are identified and addressed before they affect water supply.
ESI integrates every rain harvest system with the facility's existing infrastructure, building the collection system off the infrastructure to collect and store the rainwater for primary treatment. That stored water is used by the secondary and final treatment to connect to facility water distribution systems. Systems designed to operate independently from the grid continue producing potable water during power outages, hurricanes, and prolonged utility disruptions.
The U.S. Government has recommended ESI in over 99% of formal contractor performance evaluations over the past 14 years.
ESI has served as the continuous engineering, manufacturing, service, and warantee partner behind Fort Buchanan's rain harvest program from its pilot phase through its current 29-system deployment, including a US Army Corps of Engineers maintenance contract and an active PMIS contract since 2025. ESI does not build systems and move on. ESI stays. And all of our service is handled internally - we do not sub out.
Every person ESI sends to your installation has a direct ownership stake in the outcome. That is not a culture statement. It is a legal ownership structure that changes how people show up. When ESI wins, everyone who executed the contract wins with it.
Who Uses ESI RAINWATER HARVESTING Systems
Find your industry.
Military & Federal Installations
Federal and military facilities face water security requirements that standard municipal supply cannot always guarantee. ESI's rain harvesting systems provide potable-quality water independence for installations that need a reliable on-site water source that survives supply disruptions, supports operations across the full range of facility needs, and meets the compliance standards of regulated federal environments.
Municipal Facilities & Public Works
Municipal facilities managing operational water costs and conservation mandates benefit from commercial rainwater harvesting that reduces municipal supply dependency without creating compliance exposure. ESI engineers systems that meet the documentation requirements public-sector operators face under ongoing regulatory oversight.
Industrial & Regulated Commercial
Industrial facilities operating under water-use restrictions and environmental compliance requirements need a rainwater harvesting solution that produces compliant output and generates the documentation that regulatory oversight demands. Capturing rainwater in California and other water-stressed markets increasingly requires a system capable of meeting potable or near-potable standards that regulators and permits impose.
Off-Grid & Remote Facilities
Facilities without reliable municipal water access need systems built from the ground up for water independence. ESI's potable-standard approach means the water a system produces serves the full range of facility needs, not just non-potable applications. For remote industrial, government, and commercial operations, that is the difference between supplemental water and genuine water independence.
Related Services that Increase Water Savings
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Wash Rack Systems
ESI's closed-loop wash rack systems recycle all collected wash water, eliminating discharge and compliance exposure for regulated facilities and fleets of every type. For operations managing both wash water recycling and rainwater harvesting, ESI provides both capabilities under one contractor who understands how they interact.
Oil Water Separator Systems
The OWS system downstream of every wash rack operates under the same compliance standards as the wash rack itself. ESI builds proactive OWS maintenance programs that document inspection history, flag compliance gaps before they become enforcement actions, and integrate directly with wash rack operations so the full system performs as one.
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