Why dont I have full waterpreasure (hot or cold) at kitchen faucet. Why would I not have?

there might be a leak in the line somewhere thats causing the bad water preasure it really sounds like one might go out side to see if theres a really soggy area that just won't dry up its possible its in the yard some where it could be a leak at the water heater or in the basement how is the flushing in the bathroom water preasure there at at all if you pay your own water bill you could see if there has been any different readings at the meter some times you can see it between the water meter as to how much your using