Cisterns: Design Criteria & Requirements for RainScapes Rewards Rebates

Download a printable version of requirements (PDF)

• Required supporting documents

  • Location plan (with graphic scale); indicate foundation area
  • HOA approval letter, if applicable

• Minimum size

  • 250 gallons

• Maximum size

  • Residential: 500 gallons (exceptions can be considered on a case-by-case basis)
  • Commercial/Institutional: 2,000 gallons (exceptions can be considered on a case-by-case basis)

• Location

  • On private property
  • Above ground, installed on a solid, level support base that is designed to hold the weight of the water harvesting system when full. (A full 250-gallon plastic tank weighs over 2,000 pounds!)
  • Set away from window wells so that they can't overflow into a window well
  • Overflow must drain onto a splash block directed to a pervious surface (grass, garden, etc.) or be directed back into the downspout using an inline diverter
  • Overflow drainage outlet must be directed a minimum of 4 feet away from building’s foundation
  • Positive overflow drainage away from foundation
  • Overflow must not change the pre-existing flow path of stormwater
  • After application submittal, you will be contacted for a preliminary inspection to ensure site suitability.

• Design/Installation

  • If re-purposing a cistern, rain barrel, or container, it needs to be food grade
  • Should have secure lid and/or screen
  • Should have water spigot at the bottom of the barrel for releasing water
  • Should be made of hard plastic or a metal tank designed for water; no bags
  • Overflow with pipe that releases water onto the ground but directed away from cistern’s base
  • Clear access for cleaning the inlets when necessary

• Final steps

  • Submit itemized receipts (tax will be subtracted).
  • Electronically sign and submit the Property Owner Agreement.
  • Schedule and pass final inspection.