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Committee approves updated well-construction standards including geothermal provisions and revised bonding
Summary
The committee approved revised well construction standards that add definitions for geotechnical borings, allow low-temperature geothermal wells to be built to cold-water standards under specific conditions, and revise bonding amounts tied to flow and temperature to cover decommissioning costs.
The House Resources and Conservation Committee approved a package of revised well-construction standards after departmental staff described changes intended to clarify construction and bonding requirements and accommodate low-temperature geothermal development.
Craig Saxton and Eric Bowe presented the well construction docket; Eric Bowe described the rule as a 0-based rewrite that reorganizes content and clarifies substantive changes concentrated in definitions, bonding, casing and sealing standards. The pending rule adds a definition for "geotechnical borings" and clarifies when horizontal borings for utility installations and other non-well activities are excluded from well rules.
The rule allows low-temperature geothermal (LTG) wells with bottom-hole temperatures below specified thresholds to be constructed to cold-water well standards if they do not flow at land surface, and it sets cementing and sealing requirements for wells with bottom-hole temperatures greater than 140 degrees Fahrenheit. The department said the changes reflect drilling-community input and aim to reduce ambiguity when drillers encounter warm water.
Bonding requirements were revised to reflect decommissioning costs based on flowing characteristics and temperature. Under the rule language explained to the committee, an owner of an artesian low-temperature geothermal resource well must maintain a bond of $5,000; flowing low-temperature wells that reach land surface must carry higher bonds ($10,000); and flowing wells with bottom-hole temperatures of 140 degrees Fahrenheit or more carry higher bonds (up to $20,000, consistent with Idaho Code limits). IDWR staff said the bonding tiers reflect the relative difficulty and cost of emergency well decommissioning.
Roger Batt, representing the Idaho Groundwater Association, testified in support and said the industry participated in negotiated rulemaking. Representative Raybould described the rules as increasing consistency and safety for operators under a common standard. Representative Miller and others asked technical questions about bonds, casings and artesian flow; IDWR staff responded with statutory citations and practical reasons for the bond levels.
Representative Raybould moved approval. The committee adopted the docket by voice vote.
