I just bought a house with a 1,000 gallon propane tank owned
by the house and property tax is paid on the tank which is
a California-only thing I hear.

They just filled the tank up to 85% (they wouldn't fill further
they told my wife, otherwise it could blow up, they said).

They told me the price is $1.45 per gallon of propane plus
about a twenty dollar "hazmat" fee whatever that means, for a
total price a bit over a thousand dollars for the fill.

They said they "inspected" the system (which was existing), and
they inspected the tank which is on on four-inch thick concrete
slab bolted down by straps for earthquakes), and they charge $100
for that inspection (my wife let them in the house but she doesn't
know what they did).

I never had propane before.
I don't begrudge them anything.

But, I also don't know what's normal.
Is this normal stuff?