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Gray water irrigation systems

Discussion in 'Irrigation' started by UNISCAPER, Aug 22, 2004.


    UNISCAPER LawnSite Bronze Member
    Messages: 1,426

    With a severe drought, and water in San Diego countty at a premium, we are going to install a 1000 gallon underground water tank, pump, and flitration so a client can use the water on thier landscape and small fruit grove. The home is being replumbed so the gray water does not enter the sewer/septic.

    Herezz the question. Do any of you know of a system comes as components, be engineered, so all I have to do is connect the pieces? If not, can you suggest what ad where to start looking for? I have done a few google searches, and came up with little to no info.

    Thanks for the help in advance.
  2. jerryrwm

    jerryrwm LawnSite Bronze Member
    Messages: 1,274


    You should contact a competant, experienced irrigation contractor for this installation if you don't feel confident about doing it. I know of no kits that are sold - connect A to B and then to C.

    The differences with system are minimal, but need to be addressed.

    1. Pump protection. The system needs to have a level control switch so the pump doesn't run dry. Also a high level switch that prevents overflow of the storage tank. It can either turn the system on automatically or act as a switch and allow the controller to come on and cycle through zones.

    2. This system will be only able to operate when there is water available. There is no switching back to domestic water. It needs to be isolated physically and no possible way to connect this system to one that has potable domestic water.

    Other than choosing the heads and valves the system is still an irrigation system. You may check local codes and determine if purple non-potable pipe is required.

    Hope that helps.

    Jerry R

    UNISCAPER LawnSite Bronze Member
    Messages: 1,426


    Thanks for the input. We are licensed irrigation contractors, and, we have installed a few gray water systems, but, we wodnering with watering restrictions that are being imposed, if anyone has assembled a kit as of yet.

    We usually bury 1,000 gallon tanks, use a 3/4 hp pump with a large cannister filration system. Purple pipe is code here. We also connect street water to another set of manifolds, all with anti siphon valves so gray water can't back up into drinking water. A low water sensor is used for when the tank is almost out, and the valve switches to street water.

    It is just a major PIA to put everything together, the gray water system itself runs $6,000.00 with the 220 lines for the pump, and all the hardware, and then all the cost of the regular system.

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