Well Improvement

Looking at an older house in Arizona with an older well. Last report showed a depth of 270', 8" steel casing, 1½ hp pump at 10gpm. In general is there a way to get closer to 17ish gpm with a new pump? We'd be looking at irrigation needs as well as 6 person household. Any insight on where else I may post this question would be helpful as well. Thank you!