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Rain Water Collection Systems

Rainwater collection is more than runoff capture. Explore systems designed to support water reuse, storage planning, and site efficiency for all types of commercial, industrial, agricultural, and municipal sites.

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What is  Rain Water Collection ?

 

Rainwater collection captures runoff from roof surfaces and other catchment areas, directing it into storage for later use across commercial, industrial, agricultural, and municipal sites. Stored water may support irrigation, washdown, cooling, process use, and other non-potable demands depending on the operation and site requirements. Systems can range from a single tank installation to a larger-capacity rainwater storage system serving a facility, campus, or municipal site.

 

Storage selection depends on more than tank capacity alone. Required hold volume between rainfall events, available site space, delivery and installation access, inlet and overflow planning, material compatibility, and long-term maintenance expectations all affect the right configuration. Defining these conditions early helps avoid costly changes later and leads to a storage system that fits the site, the application, and the intended water use.

 

Who Works In This Field

Rainwater collection systems are specified and managed by facility managers, property managers, engineers, contractors, project managers, maintenance teams, agricultural operators, and municipal planners responsible for water reuse, site infrastructure, and stormwater strategy. Applications range from single-tank installations at commercial properties to larger-capacity systems serving campuses, farms, and public facilities. While project scope varies, the underlying requirement is consistent: dependable storage that supports planned water reuse and site-level water management.

The Problem They Face

Rainwater collection projects have to bridge the gap between inconsistent rainfall, required storage volume, and the physical constraints of the site. Limited footprint often restricts tank size, placement, and access, while material selection has to account for the environment, intended water use, and long-term exposure conditions. If overflow routing, inlet and outlet connections, service access, and maintenance requirements are not addressed early, the result is often a system that is harder to install, harder to maintain, and less effective once it is in service. 

Helpful Codes & Regulations

 

Rain water collection projects may need to meet local, state, or national codes depending on the application, jurisdiction, and how the stored water will be used. Requirements vary, but the standards below are commonly referenced in rain water storage system planning and tank selection. Not every standard applies to every project. A Sales Specialist can help you determine which codes are relevant to your specific installation.

 

  •  NSF/ANSI 61: Establishes health and safety requirements for materials and components that contact drinking water. Applies when stored rainwater may connect to or supplement a potable water system.    

  •  AWWA D100: Covers minimum requirements for the design, construction, inspection, and testing of welded carbon steel tanks used for water storage at atmospheric pressure. 

  •  AWWA D103: Covers minimum requirements for factory-coated, bolted carbon steel tanks used for water storage. Commonly referenced for field-assembled bolted steel installations.    

  •  ASTM D1998: The standard specification for polyethylene upright storage tanks, covering materials, design, construction, and testing for rotationally molded poly tanks. 

  • Local stormwater and building codes: Many jurisdictions have their own ordinances governing rainwater collection, overflow management, and allowable end uses. These vary by state and municipality and should be confirmed early in the project. 

 

 

Specialist Support for Your Storage Project

Talk with a specialist for practical guidance and equipment recommendations.

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Frequently Asked Questions

Common questions about Rain Water Collection and what you need to know!

How do I size a tank for a rain water collection system?

Tank sizing depends on your catchment area, local rainfall averages, and how much water you plan to use between rain events. A Sales Specialist can help you estimate the right capacity based on your site data and intended use.

Can rain water collection tanks be installed on tight sites?

Yes. Some tank types are better suited for constrained footprints than others. Poly vertical tanks and certain steel configurations can be sized to fit limited spaces while still providing useful storage volume.

What tank material works best for rain water storage?

Material selection depends on the site environment, volume requirements, and how the water will be used. Corrugated steel and stainless steel handle large volumes well, while poly tanks work for smaller, standalone systems. Your Sales Specialist can help match material to your project conditions.

What maintenance should I plan for with rain water storage?

Routine maintenance typically includes inspecting inlets, screens, and overflow outlets, along with periodic checks for sediment buildup inside the tank. Frequency depends on the tank type and local conditions, but annual inspections are a reasonable baseline for most installations.