Is also worth remembering that cash strapped fire services have to pay for repairs to hydrants.
Some years back, Thames Water were under pressure (excuse the pun) by politicians to cut down on water leaks. One of their means of doing so was to reinspect every hydrant and repair every fault, even (like a leaky spindle) it didn't effect firefighting. Thames water reached their leakage targets whilst the LFB picked up the tab.
The Herts F&RS used to (and may still do) test private hydrants on a fee-paying basis.
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It was round the same time, I attended a liaison meeting with Herts FRS and discovered that they were not testing any hydrants as their repair budget has been used up. Therefore it was decided, why bother finding faults if we can't fix them?
The LFB also toyed with the idea of limiting hydrant testing by establishing 'key hydrants' in certain geographical positions, which would be maintained and serviced. Other less significant hydrants would no longer be serviced - say as those in housing estates- as it was argued that most house jobs could be dealt with by the capacity of 2 - 4 pumping appliances.
So far, the recommendations of this little known report have stayed gathering dust. But with the fashion of employing senior managers from outside the fire service to run the show, it's only a matter of time before the accountants/managers dig this idea out and perhaps run with it.