What is the expected GPM water flow for outdoor garden hose?
Most house hold well test require 5gpm.
This flow rate is needed for many lenders, so 3 GPM is low. The well flow test are usually done for 3 hours non stop.
There can be many factors that reduce the flow.
Galvanized pipes are the worst, they fill up and end up with small channels inside the pipes limiting your flow , you put a pressure gauge on the spigot and have 60+ psi but when you open the flow it drops to 20, it happens I have picked several short buys and had to change the plumbing out.
Debris in the valves can also limit flow
Last debris in the foot valve is another problem for wells