Senate committee advances bill requiring monthly and annual cloud-seeding reports after public testimony

Senate Bill 10‑64, a measure that would define cloud seeding activities and require monthly and annual reporting, was advanced out of committee after sponsor Tammy Nichols and several members of the public testified for greater transparency.

Senator Tammy Nichols, sponsor of the bill, told the committee the measure "creates clear definitions, enhancing transparency, ensuring accurate and regular reporting" and "cleans up and streamlines the existing section of Idaho's weather modification laws." She said stakeholders — including Idaho Water, Idaho Power and the Idaho Water Resource Board — helped shape the bill.

The bill would add statutory definitions for terms such as "board" and "cloud seeding," require operators to submit monthly operational reports to the Idaho Water Resource Board, and require an annual package that includes operational data, an environmental impact assessment, documentation of public engagement and effectiveness metrics (for example changes in snowpack or reservoir levels). Nichols told the committee the intent is to make reports accessible online so "cloud seeding operations are both accountable and responsible."

Public testimony underscored the contrasting views among researchers, operators and environmental advocates. Sarah Allstadt, testifying remotely, cited the 2024 Government Accountability Office cloud‑seeding assessment and urged stronger reporting and transparency, saying the report found "reliable information is lacking on the conduct of optimal effective cloud seeding and its benefits and effects" and that some studies' estimated effects were "not distinguishable from 0 with a high degree of statistical confidence." Taylor Van Arsdale, describing horticulture training and work in landscape installation, raised soil and ecological concerns about silver iodide and said "the EPA has noted that they do not have data sufficient to make a risk determination."

Melissa Blevins of Caldwell, who supported the bill, referenced Project Snowy research and quoted investigators expressing caution: "we cannot really generate an awful lot of snow," and noted that Project Snowy researchers linked seeding to clear effects in only a few clouds. Blevins also cited an Idaho Water Resource Board statement that the board receives about $10,000,000 a year for cloud‑seeding activities and said that level of public spending merits thorough and accessible evaluation.

Paul Arrington of the Idaho Water Users Association said the association supports the bill with proposed amendments and praised the sponsor’s stakeholder process. Arrington and other witnesses told the committee existing reports and a departmental webpage already provide some information but that codifying reporting requirements would standardize and centralize disclosures.

Committee members questioned the legal and water‑rights implications. Senator Guthrie asked whether cloud‑seeding‑generated water would receive a new priority date under prior appropriation; Paul Arrington answered that snowpack from seeding is treated the same as other snow when it melts and enters the prior appropriation system, meaning it does not create a separate class of water. Senator Taylor asked about potential fiscal impacts. Nichols replied that the Idaho Water Resource Board already issues annual reports and that she did not expect the bill to create new costs beyond existing reporting.

After discussion the committee voted to send Senate Bill 10‑64 to the fourteenth order for possible amendment. The motion was made on the floor, seconded, and carried by voice vote.

The bill now moves to the fourteenth order where sponsors and stakeholders expect technical adjustments before floor consideration.

Sources: committee hearing transcript; public testimony summarized from statements made during the hearing.