It probably varies by local ordnance from jurisdiction to jurisdiction. In the city where I began my career as a beat cop it was 20 feet either side of the hydrant.
10 feet
In Georgia, you must park at least 15 feet away from a fire hydrant. This distance is established to ensure that firefighters have easy access to the hydrant in case of an emergency. Violating this rule can result in fines or your vehicle being towed. Always check local regulations, as they can vary by city or municipality.
15 feet
Although municipalities, each have their own restrictions, the normal law is fifteen feet.
15
10 feet?
15
Standard distance for parking from hydrant is 2 car lengths. Page 67 of the Maryland Drivers Handbook states you must be 15 feet from a fire hydrant, that is about 1 car length.
Better to park your car 20 feet away from the Fire Hydrant System because it is an emergency system. Anytime we need to keep it ready for use.Added: Once again, as it is with most traffic regulations, it depends on what jurisdiction you live in. Some locales specify a distance of 25 feet from a fire hydrant.As a general rule it is best to assume that you should leave at least one car's length of distance on either side of the fire hydrant to be safe.
In Maui, Hawaii, as in many places, you must park at least 15 feet away from a fire hydrant. This distance is enforced to ensure that firefighters have access to the hydrant in case of an emergency. Violation of this parking rule can result in fines or your vehicle being towed. Always check local signage for any specific regulations.
15 feet
You must park more than 50 feet away from rail road tracks. 10 feet from a hydrant. 25 feet from a crosswalk. 50 feet from a stop sign. and more than 20 feet of the driveway entrance to a fire station and over 75 feet on the side opposite a fire station entrance.