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Staff warns Idaho water rule will create 'dry subdivisions' and complicate landscaping, fire protection and development
Summary
Planning staff said an Idaho Department of Water Resources change effective July 1 limits domestic well permits for irrigation in subdivisions, producing 'dry subdivisions' unless surface water rights or community wells exist; commissioners discussed consequences for landscaping, fire suppression and construction costs.
Planning Administrator Joshua Chase told the commission that the Idaho Department of Water Resources has issued guidance (effective July 1) limiting domestic well permits so they no longer authorize irrigation for new subdivisions, meaning lots without surface irrigation rights or a community well will effectively be "dry." Chase said staff received letters for two subdivisions indicating they would be dry under the IDWR position.
"These will be dry subdivisions," Chase said when describing the IDWR policy's practical effect. Commissioners and other participants raised immediate questions about the rule's reach (for example, whether it applies to subdivisions with final plat approval before July 1) and noted that the state indicated potential clarifying language could come in December.
Speakers warned of several consequences: landscaped buffers and screening that rely on irrigation may fail; the nursery and landscaping industry may need to shift to drought‑tolerant stock; and fire‑protection strategies that depend on household irrigation or sprinkler systems could be constrained. Commissioners cited examples where landscape irrigation helped during wildfire response and warned that limiting irrigation could increase fire vulnerability absent alternative mitigation.
Chase said staff will share IDWR and related documents with commissioners and coordinate with public works and fire to understand code implications — for example, whether landscape requirements should be revised or alternate mitigation (hardscaping, rock work, different plant palettes) should be recommended.
Next steps: staff will circulate the IDWR language and coordinate cross‑departmental review with public works and the fire protection authorities before drafting code amendments or guidance for applicants.
