Local water service adopted new tiered rates this year, so at the high end (above 6,000 gal I think) the cost is $13/1000gal. A recent bill that included 8,000 of a partial fill was $150; several years ago I filled the entire pool and it was only $168. A full fill now would be about a $350 bill by my estimation. When I did the full fill, the city didn't offer a refund of the sewer charge which is ridiculous IMO.
I don't think the FD will fill here, but haven't asked.
I did call a water delivery company. Their trucks haul 2,400gal and it's $150/truck. So for my pool, $1500 delivered.