Do you have working fire hydrants?
When we built the house we were required to install a 2500 gal water tank hooked up to a fire hydrant we installed near the house. The hydrant had to have fire dept. hose fittings.
Over time we have added an additional 3500 gals of storage, an electric pump with 1” hose fittings, a gas powered pump with 1” hose fittings and 200’ of 1” hose. Things do need to be updated and added to though.