Is just a moderate sized house if there is a 550 foot run in/on it
Possibly has a meter and a 550 foot run to the house?
If so then the need for an EGC depends if the meter has a service disconnecting means associated with it. Just a meter with no disconnect/overcurrent protection - the load side conductors are still considered service conductors. Throw a (per defined) service disconnecting means in at the meter location, and the load side conductors are feeders and will require an equipment grounding conuctor.