Hawaii Water Restrictions 2026

Water restrictions in Hawaii are primarily set by local utilities. State agencies coordinate drought declarations and unlock emergency funding but do not directly set municipal watering schedules.

Honolulu Board of Water Supply serves the Honolulu area and coordinates conservation messaging with the state drought management framework.

Hawaii water restrictions are coordinated through the Commission on Water Resource Management (CWRM) under the Hawaii Water Code (HRS §174C). Each county — Honolulu on Oahu, Hawaii County on the Big Island, Maui County, and Kauai County — manages its own water supply separately. The Honolulu Board of Water Supply (BWS) — the largest utility, serving Oahu's 1 million residents — maintains a conservation program tied to Oahu's Southern Oahu Basal Aquifer levels and Koolau Mountain stream flows. Hawaii's rainfall varies dramatically by location: windward sides of the islands receive 200+ inches annually while leeward communities near Honolulu receive 15-20 inches, creating widely different conservation needs within a single island.

Stage 1 (current): Voluntary reduction requested. Recommended odd/even guidance. No fines at Stage 1.

Stage 2 (if triggered): Mandatory odd/even. Fines begin at $100 per violation. Enforcement by utility field staff.

Stage 3 (severe): 1 day/week watering. Higher fines.

Honolulu BWS uses a three-stage conservation system: Stage 1 is a conservation advisory requesting voluntary reduction; Stage 2 activates odd/even restrictions with enforcement; Stage 3 restricts outdoor irrigation to one day per week. BWS triggers are based on aquifer levels at the Pearl Harbor Aquifer, Honolulu's primary drinking water source, combined with Koolau Mountain stream flow indices. Hawaii's geology — volcanic basalt aquifers — recharges quickly during heavy rainfall events compared to mainland sedimentary aquifers, giving BWS flexibility to ease restrictions rapidly when rainfall patterns normalize.

Hawaii lawn grasses handle voluntary 3-day/week schedules when watered deeply rather than shallowly.

Accept natural seasonal dormancy — do not fight it with extra irrigation.

Consider native plant conversion for parkway strips and low-traffic landscape areas.

Hawaii's residential lawns — predominantly Bermuda Grass and St. Augustine at lower elevations, with grass-free landscaping increasingly common on water-stressed leeward properties — handle Hawaii's periodic conservation measures differently from mainland cool-season lawns. Bermuda and St. Augustine both tolerate significant drought stress before permanent damage occurs; going semi-dormant during Stage 2 restrictions is a normal and healthy response rather than a sign of lawn failure. Leeward Oahu and the dry south coasts of other islands are moving toward drought-tolerant native plant landscaping, and BWS offers rebates for removing irrigated turf and replacing it with native or drought-adapted species.

Hawaii HOA law typically requires HOAs to accept municipal conservation ordinances during active Stage 2+ declarations.

Document compliance with the active city advisory or ordinance if your HOA sends a violation letter.

File complaints with your state's Real Estate Commission if an HOA persists after ordinance compliance is documented.

Hawaii Revised Statutes Chapter 514A (condominiums) and Chapter 421J (planned community associations) establish that association rules must comply with applicable law. Honolulu BWS mandatory restrictions constitute applicable city-county ordinances under which HOA lawn appearance enforcement is suspended during active conservation measures. Hawaii homeowners should document BWS restriction notifications and respond in writing to any HOA violation notice. The Hawaii Office of Consumer Protection handles formal HOA enforcement complaints and provides guidance on the applicable statutory framework.

Hawaii's Bermuda, St. Augustine, and Zoysia lawns handle Honolulu Board of Water Supply Stage 2 odd/even restrictions well because of the grasses' natural drought tolerance. On permitted days, run spray zones 25-30 minutes or rotor zones 40-50 minutes to deliver a deep irrigation event. Water between 5 AM and 10 AM — Hawaii's trade winds make midday irrigation extremely wasteful, with 40%+ evaporation loss in windy leeward communities.

Hawaii's volcanic basalt soils drain quickly in most residential areas; two deep weekly sessions are generally sufficient, with three sessions during extended dry spells. Cycle-and-soak is rarely needed on Hawaii's typically well-drained soils. Raise Bermuda mowing height to 4 cm (1.5 inches) and St. Augustine to 8 cm (3 inches) during active restrictions. Allow warm-season lawns to enter semi-dormancy during the driest stretches — recovery is typically within 7-14 days of restriction end because Hawaii's year-round warm climate supports continuous growth.

Local resource: University of Hawaii Cooperative Extension Service (ctahr.hawaii.edu) has offices on all major islands providing free soil testing and landscape consultation calibrated to Hawaii's unique island conditions. Honolulu Board of Water Supply (808-748-5000) operates a comprehensive customer conservation program including free irrigation audits, smart controller rebates, and turf-replacement rebates for leeward-coast residents converting to drought-adapted native landscaping.