How Idaho's domestic well law applies to Teton Heights.
There's understandable confusion in Eastern Idaho right now. The Legislature changed the domestic well law in 2025, then amended it again in 2026. Here's the full picture and where Teton Heights Division 6 stands.
What actually happened in the Legislature
Here's the timeline so you can see exactly how the rules evolved.
Before 2025 — the original domestic exemption
Idaho Code §42-111 and §42-227 allowed any homeowner to drill a private well for "domestic" use without a separate water-right permit. "Domestic" included household water plus irrigation of up to ½ acre of lawn, garden, or landscaping per home. This is why most rural Idaho subdivisions rely on private wells for both drinking water and yards.
2025 — Senate Bill 1083 tightens the rules for new subdivisions
Effective July 1, 2025, SB 1083 amended §42-111 and §42-227. For new subdivisions platted on or after that date, the domestic exemption no longer covered outdoor landscape irrigation the same way — developers and lot owners had to look at shared systems or separate water rights for lawns and landscaping.
This is the change that generated headlines like "Idaho ends well irrigation for subdivisions." It applied going forward — but it created immediate uncertainty for lots that had already been planned or platted.
2026 — Senate Bill 1222 grandfathers existing subdivisions
Signed into law by Governor Little on February 18, 2026, SB 1222 amended the domestic-well statutes again to fix the unintended consequences of SB 1083. The key provision: subdivisions platted and approved before July 1, 2025 remain under the prior rules, and lot owners can continue to use a private domestic well to irrigate their lawn, garden, and landscaping up to the ½-acre limit — just as they always could.
References
- • Idaho Senate Bill 1083 (2025) — Amended Idaho Code §§42-111 and 42-227, effective July 1, 2025
- • Idaho Senate Bill 1222 (2026) — Grandfather provision for subdivisions platted before July 1, 2025; signed Feb 18, 2026
- • IDWR Administrator's Memorandum — Application Processing No. 80 / Adjudication No. 62 (June 25, 2025)
- • Idaho Department of Water Resources — Domestic Exemption page
This page is a plain-English summary, not legal advice. For your specific situation, contact IDWR or a licensed Idaho water-rights attorney.