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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

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  1.  
    +1, but....

    In the case of this thread, the OP has a 6000litre pumped rainwater store, and has sensibly come here for advice how to get started with outdoor plumbing projects. I'd say the advice given about hygiene is pretty wise - if say a future occupier of the house got lazy or confused while connecting up garden hoses, then the risk of contaminating the local drinking water is quite high.

    Always thought its unusual that breaking the water regs is a criminal offence, but compliance with building regs is a civil matter, even the bits about structural/fire/electrical safety.
    • CommentAuthorMike1
    • CommentTimeMay 1st 2021 edited
     
    Posted By: Peter_in_HungaryThe post by Mike1 is a very different situation to a garden tap.
    Of course :)

    It relates to the enlargement of the discussion to safeguards in the mains supply and water meters...

    Posted By: revorI was told not to concern myself as there was no risk, as the supply system ensured it could not happen.
    Posted By: owlmanI would imagine there are numerous check valves built into any delivery system, perhaps into meters for instance, just guessing.

    ...the common factor being the importance of check valves.
  2.  
    Posted By: WillInAberdeenn the case of this thread, the OP has a 6000litre pumped rainwater store, and has sensibly come here for advice how to get started with outdoor plumbing projects. I'd say the advice given about hygiene is pretty wise - if say a future occupier of the house got lazy or confused while connecting up garden hoses, then the risk of contaminating the local drinking water is quite high.

    If there is a rain water collection system then IMO the easiest and safest thing to do is to keep mains and rainwater systems totally separate.
    •  
      CommentAuthordjh
    • CommentTimeMay 1st 2021
     
    Posted By: Peter_in_HungaryIf there is a rain water collection system then IMO the easiest and safest thing to do is to keep mains and rainwater systems totally separate.

    +1

    When I started building our house I had planned to use rainwater for filling WCs. (SWMBO wouldn't consider any other indoor uses). But during the process I discovered quite how onerous the regulations are for mixing the two supplies and gave up on the whole idea. So our rainwater is just used to water the garden now, apart from that which goes straight into the duck pond (well, moorhen pond actually)
  3.  
    Indeed, the OP is planning to have one or more outside taps that dispense rainwater and several more that dispense drinking water. The concern is that someone (future occupier perhaps) connects a hose with a T connected to both taps, so they always have water out of the hose even when the tank is empty. Or perhaps deliberately connects the two taps with a hose, to top up the grey water system tank with mains water. Or just messes up which end of the hose is connected to what tap. Then, the double check valve in the mains tap will save the day, if it is present and still working.
    •  
      CommentAuthordjh
    • CommentTimeMay 1st 2021
     
    Posted By: WillInAberdeenthe double check valve in the mains tap

    Note that the check valves built-in to some taps are expressly excluded from consideration as the check valves that are required. You must have separate check valves in the pipe run.
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