Yes, rainwater collection is legal in Wyoming, but its permissibility hinges on compliance with state water rights laws and local ordinances. Wyoming adheres to the prior appropriation doctrine, meaning unregulated collection could infringe on downstream users’ rights. The Wyoming State Engineer’s Office (SEO) monitors compliance, particularly for systems exceeding 100 gallons or those tied to groundwater permits. Recent 2026 draft guidelines propose stricter reporting for larger systems, reflecting growing scrutiny in arid regions.
Key Regulations for Rainwater Collection in Wyoming
- Prior Appropriation Doctrine: Collection must not diminish natural flows that impact senior water rights holders. The SEO may require permits for systems storing over 100 gallons or those diverting runoff from natural channels.
- Local Ordinances: Counties like Laramie and Teton enforce additional restrictions. For example, Teton County mandates permits for all residential systems, with inspections for structural integrity and water quality.
- Groundwater Permits: Systems relying on groundwater recharge or storage may trigger Wyoming’s Groundwater Management Plan, particularly in the High Plains Aquifer region. Failure to register can result in fines up to $1,000 under W.S. § 41-3-103.
Violations are typically addressed through cease-and-desist orders or administrative penalties. Consult the SEO’s 2026 Water Development Office Report for updates on evolving compliance standards.