^ no fire department does it.
IF YOU DO NOT KNOW HOW TO REMOVE A TANK REGULATOR DO NOT ATTEMPT TO DO SO!
general fire and safety in ralston will hydrostatically test any HPA cylinder for $20, however the reg must be removed from the bottle before it is brought in and i highly suggest you take it to someone who is trained and experienced in removing and re-attaching the regulators
http://www.generalfiresafety.com/
if you do not know how to remove a regulator safely and don't wish to take it to anyone locally to remove it you can mail the tank and reg to ninja paintball USA and they will remove, hydro, and re-attach the regulator but it costs about $40 a bottle plus shipping