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Fire hydrant that usally leak at the base need to be service by replacing the main gate rubber That depends on the location of the leak.
The seals on the part that turns it on at the top can be replaced without digging as long as the water supply to the hydrant can be shut off at another location.
The hydrant is bolted to a flange which is attached to an underground pipe which itself probably has a few more underground that you cannot see.
Between the hydrant and the flange is a gasket, now if this gasket is leaking the hydrant will need to come off. Sometimes the bolts are exposed but not always.
Then if it is a fitting below that is leaking then some major excavation will need to be done.
I just recently did a repair on a 12 inch line here at the Golf course and the hole was quite large as the pipe was nearly ten feet under the surface at the leak.
Pinpointing the exact location of the leak is a problem as well.
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