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For larger commercial and multifamily buildings that may have problems complying with minimum rainwater provisions in the Virginia Plumbing Code, designers may submit a request to utilize this alternative method with their proposed rainwater harvesting system. If designing to the CSA B805-18/ICC 805-2018 standard, the designer must clearly show how the proposed system complies with the requirements of the chosen compliance path defined in the standard.
It requires 2,300 kilowatt-hours of electricity to pump, treat, transmit and distribute one million gallons of potable water. See note about Cap One Block C below – code modification that was approved ensures that about 4.8 million gallons of potable water demand is deferred, leading to over 11,000 kw-hr of deferred electric demand.
Shane Murphy email June 19, 2018: Also, Gordon took a look at the cistern sizing calculations and historical rainfall data. The cisterns affected (all except the McLean 2 building cistern which, as noted, is under the old code) were previously designed to provide approximately 6,500,000 gallons of makeup water per year. Based on the assumed lost areas due to the new code the cisterns would only provide approximately 1,700,000 gallons per year. The delta at the current average Fairfax Water consumption rate equates to an additional $16,400 per year that Capital One would have to pay in water fees due to the new code changes
Update to NVBIA/NAIOP Regarding Rainwater Harvesting
A Fairfax County, VA, publication
Department of Land Development Services
Update to NVBIA/NAIOP regarding rainwater harvesting
March 21, 2019
Rainwater harvesting update
• Problem statement:
Plumbing code definitions of
rainwater restrict harvesting
from rooftop collection
surfaces most types of reuse.
– Example: collection from
publicly accessible dog runs or
park use on top of a building
– Reuse of water for cooling
towers is not approvable per
• Working solution: Applicant
can pursue alternative
compliance path via code
– Applicant can reference
Association (CSA) –
International Code Council
(ICC) document .
– CSA B805-18/ICC 805-2018
– Includes prescriptive and
– Staff has approved two
developments in Tysons.
Building Official’s blog update is available
For additional information, please contact