California Code, Public Resources Code - PRC § 3757.2

For the purpose of developing low-temperature geothermal resources, the supervisor may approve the exemption of any low-temperature geothermal well from Sections 3721, 3722, 3723, 3723.5, 3725.5, and 3745, if the resource is used domestically or in a noncommercial manner.  The supervisor may also approve the drilling of low-temperature geothermal wells at whatever locations he deems advisable, if no well is drilled or permitted to produce which is located within 15 feet of the outer boundary of the parcel of land on which the well is situated or within 15 feet of a public road, street, or highway dedicated prior to the commencement of drilling.