Rainwater Harvesting Tanks

Xerxes Rainwater tank

Harvesting Rainwater Addresses Water Shortages

With severe water shortages and diminishing supplies even in traditionally water-rich regions, it is more important than ever to collect and reuse water. Businesses, homes and communities install Xerxes’ fiberglass storage tanks so they have all the water they need for both everyday and emergency use. Harvested rainwater can be used for irrigation and landscaping, and, when treated, it can supply greywater or even potable water.  

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Diameters

Nominal diameters
from 4 feet to 12 feet

Capacities

600 to 60,000 gallons
2,900 to 150,000 liters

Models

Corrosion-resistant, watertight
single-wall and double-wall

Installations

One-piece, factory-fabricated tanks for quick and easy installation

Rainwater Harvesting Tank Data Sheet
Rainwater Harvesting Tank Guide Spec
Resource Library

Why choose a Xerxes rainwater harvesting tank?

  • Ideal for tight site footprints and remote locations
  • Integral, high-profile fiberglass ribs increase structural strength 
  • Designed to withstand H-20 / HS-20 axle loads
  • Underground tank optimizes land use

Xerxes tanks meet – or exceed – industry standards

Several industry standards address the growing need for standby water for rainwater harvesting systems.

IAPMO/ANSI Z1002

Can be manufactured to comply with IAPMO/ANSI Z1002

ANSI/AWWA D120​

Thermosetting Fiberglass-Reinforced
Plastic Tanks

NSF/ANSI/CAN 61​

Can be manufactured as an
NSF 61-listed tank

Rainwater Tanks Success Stories

Rainwater tank Washington DC

Residential complex - Washington, D.C., US

Reusing rainwater can minimize strain on municipal systems.

The developer of a Washington, D.C. waterfront apartment building with ground-level retail needed a system for water harvesting and recycling in a limited space. Because of our custom manufacturing and field modification capabilities, we were able to provide just the right size tanks for the small footprint instead of the originally specified wide-diameter piping system. Two fiberglass tanks, with a total capacity of 40,000 gallons, were the long-term solution for collecting, disinfecting and storing water for the project. The developer benefited from Xerxes’ turnkey approach, with our access openings, fiberglass ladders, flanged nozzles and anchoring system. The water is being reused as greywater, which provides ongoing cost savings and water conservation.

Greenhouse rooftop - Wisconsin, US

Collecting, treating and reusing rainwater adds up

A complete water harvesting system was designed for the 60,000-square-foot glass rooftop of the Milwaukee County Greenhouses in Wisconsin using Xerxes’ durable fiberglass tanks. Four of our tanks collect approximately 38,000 gallons of water for every one-inch rain event. The collected rainwater is then filtered, disinfected and redistributed for year-round irrigation inside the greenhouses. This translates into a potential capture and reuse of more than one million gallons of rainwater and snow melt every year. The state-of-the-art facility at this site, and the cost savings it provides, enables the county to serve the community in many ways, including conserving valuable water resources.

greenhouse