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The governments (local, state, and federal) are discouraging open loop systems. There are many reasons, such as problems with hard water deposits, people just dumping the outflow into the storm sewer, or watering their lawns in places with water shortages and restrictions. I installed my original system back in 1980. Since I am putting my outflow back in the ground and I haven't had any deposit problems, when I replaced my heat pump in 2004 my system was grandfathered in. My original system cost $3000, total, including air handling duct work (I already had a well and pump, so they only had to add the return wells), and the new replacement heat pump cost $3300 minus a utility rebate.
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