The Boise City Council adopted a tiered water conservation ordinance Tuesday that establishes mandatory watering restrictions during drought conditions, offers rebates for water-efficient landscaping, and sets higher rates for excessive residential water use during peak summer months. The ordinance responds to growing concerns about water supply adequacy as Ada County’s population continues to expand while the region’s water resources remain finite and increasingly strained by climate variability.
The ordinance establishes three conservation tiers that activate based on water supply conditions monitored by the city’s public works department. Tier 1 (voluntary conservation) encourages reduced outdoor watering. Tier 2 (moderate restrictions) limits residential watering to three days per week on an odd-even address schedule. Tier 3 (severe restrictions) limits watering to two days per week and prohibits car washing, fountain operation, and new landscape installation.
Why Water Conservation Matters for Ada County
The Boise area’s water supply comes from a combination of surface water diversions and groundwater wells that are recharged by snowpack and precipitation in the surrounding watershed. While the water system has adequate capacity under normal conditions, drought years — which have become more frequent — can stress supply to the point where conservation measures are necessary to maintain adequate pressure and fire suppression capability.
The city’s water director presented data showing that residential water consumption during peak summer months has increased 18% over the past five years, outpacing the 12% population growth during the same period. Much of the increased consumption is attributed to large-lot landscape irrigation in new residential subdivisions.
“Water is not unlimited, and we cannot assume that every summer will bring normal precipitation,” the director told the council. “This ordinance gives us the tools to manage our supply responsibly during dry years without resorting to emergency rationing.”
Rebates and Incentives for Water Efficiency
The ordinance includes a positive incentive component: homeowners who replace water-intensive lawns with drought-resistant landscaping can receive rebates of up to $500 through the city’s WaterWise program. The program also offers free irrigation audits to help homeowners identify and fix leaks, adjust sprinkler coverage, and optimize watering schedules.
What Comes Next
The conservation tiers take effect June 1. The city will distribute informational mailers to all water customers in May explaining the tier system, watering schedules, and available rebate programs. Residents with questions can contact the Boise Public Works Department or visit the city’s website for water conservation tips and resources.