Geoengineering Bills by State
2025 Regular Session
Adjourned Session ended Apr 30, 2025
Governor: Greg Gianforte
| Bill # | Details | Effective | Status | |
|---|---|---|---|---|
|
2019 Regular Session
|
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| HJ40 | Study of weather modification | Passed | ||
| Montana House Joint Resolution 40 passed in 2019 directing a legislative study of weather modification laws to propose changes that would encourage increased use of cloud seeding technology for enhancing precipitation and water supplies. |
Last update Wed 1 May 2019 |
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| Note: Resolution filed with Secretary of State May 1 2019 | ||||
|
2021 Regular Session
|
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| SB29 | Revise weather modification and control laws | Died in process | ||
| Montana Senate Bill 29 passed the Senate in 2021 but died in the House revising weather modification laws to streamline the licensing process mandate 100000 dollar liability insurance require environmental review and facilitate increased use of cloud seeding technology. |
Last update Thu 29 Apr 2021 |
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| Note: Passed Senate; rejected by House floor. | ||||
|
2025 Regular Session
Session Adjourn Wed 30 Apr 2025
|
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| SB473 | Prohibit weather modification. | House Not Concurred | ||
| Montana Senate Bill 473 passed the Senate in March 2025. Still, it died in the House, prohibiting large-scale geoengineering practices such as stratospheric aerosol injection and solar radiation management, while explicitly protecting cloud seeding for agriculture and water management. |
Last update Fri 23 May 2025 |
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| Note: Survived Senate drama; died on House floor | ||||
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