Tucson AZ Water Restrictions 2026

Current water restrictions in Tucson, Arizona

Tucson is under a Critical Water Alert, limiting outdoor irrigation to 1 assigned day per week, as declared by Tucson Water in response to ongoing Colorado River supply constraints and the federally declared Tier 2 Shortage on the Colorado River system.

Tucson Water triggered the Critical Water Alert primarily because of the Central Arizona Project (CAP) pipeline, which delivers Colorado River water from Lake Havasu to Tucson and accounts for roughly half the city's supply. Under post-2026 federal operating guidelines, Arizona faces a potential 27% cut to its CAP allocation, compounding the Tier 2 Shortage already in effect. That shortage reduces Arizona's Colorado River deliveries by approximately 592,000 acre-feet annually statewide.

The city has partially cushioned this blow through its Underground Water Storage and Recovery Program, which has been banking surplus CAP water in the Tucson Basin aquifer since the 1990s. Those stored groundwater credits provide a meaningful buffer, but Tucson Water has been clear that banked supplies are not unlimited, and long-term delivery risk under post-2026 rules justifies emergency-level restrictions now.

At the state level, Arizona is operating under a Colorado River Tier 2 Shortage declaration coordinated through the Arizona Department of Water Resources (ADWR). Phoenix is simultaneously under Stage 2 Drought Response, reflecting how broadly the CAP shortfall is affecting the metro region.

Practically, these restrictions mean that a Tucson homeowner cannot run sprinklers or an irrigation timer on a random Wednesday morning. You must water only on your one assigned day, and only during early morning or late evening hours. Drip irrigation and hand-held hose watering with a shut-off nozzle remain exempt year-round, giving most desert landscaping a viable path through the restriction period. Contact Tucson Water at 520-791-3242 to confirm your assigned watering day.

Watering schedule and allowed days

Tucson Water assigns outdoor watering days based on your service address. Odd-numbered street addresses are typically assigned different days from even-numbered addresses, though Tucson Water may adjust assignments by zone during a Critical Water Alert. Call 520-791-3242 or check your account online at tucsonaz.gov/water to confirm exactly which day applies to your property — do not assume based on a neighbor's schedule.

Multi-family residential properties and commercial accounts fall under the same one-day-per-week rule for outdoor irrigation, but their assigned days may differ from single-family residential schedules. Commercial customers with large irrigated landscapes, such as apartment complexes or office parks, should contact Tucson Water directly for a site-specific schedule and to discuss whether any variance process applies to their account during the Critical Water Alert.

Tucson's arid landscape means many residents rely heavily on drip irrigation for desert trees and shrubs rather than spray heads. Drip systems are fully exempt from the day-and-hour restriction, which is critical for native and adapted species that need slow, deep watering. Saguaro cacti, palo verde trees, and desert willow — all common in Tucson yards — tolerate infrequent watering well but benefit from one deep drip cycle every week or two during summer monsoon gaps. These species should be prioritized if you are manually deciding which plants receive your single allowed spray-irrigation day.

What happens if you violate restrictions in Tucson?

Tucson Water enforces restrictions through a combination of automated smart meter data, field patrols by water conservation staff, and resident complaints submitted via the city's online portal or by calling 520-791-3242. Tucson Water's Advanced Metering Infrastructure (AMI) system can flag accounts with irrigation usage occurring outside permitted hours or on non-assigned days, making remote detection possible without a field visit. Complaint-based enforcement typically generates an inspection response within one to three business days.

If you receive a warning or fine and believe it was issued in error — for example, because your drip system activated during a non-permitted window — Tucson Water does have an appeals process. You can request a review by contacting the Water Conservation office directly at 520-791-3242. Document your irrigation controller settings and any maintenance logs before appealing, as the burden of demonstrating compliance rests with the account holder.

Other outdoor water rules

Beyond lawn and landscape irrigation, Tucson Water's Critical Water Alert restricts or conditions several other outdoor uses. In Tucson's desert climate, pool evaporation is among the highest practical concerns — pools can lose 1–2 inches of water per week to evaporation during summer. The following rules apply to non-irrigation outdoor water use:

• Swimming pools: Refilling to compensate for evaporation loss is permitted, but draining and fully refilling a pool is prohibited except for documented structural or health reasons approved by Tucson Water.
• Car washing: Permitted only with a hand-held hose fitted with a self-closing shut-off nozzle. Commercial car washes using recirculating water systems are exempt.
• Pressure washing: Restricted to essential health and safety uses only — cosmetic cleaning of driveways, patios, and exterior walls is not permitted during the Critical Water Alert.
• Decorative fountains: Required to be shut off unless they operate on a fully recirculating closed-loop system. Non-recirculating fountains must be turned off.
• Construction water: Dust control and concrete curing are considered essential and are not restricted, but contractors must use the minimum amount necessary and are subject to Tucson Water audits for large permitted projects.
• Restaurant outdoor water features: Ornamental water use at commercial dining establishments falls under the decorative fountain rule — recirculating systems allowed, single-pass systems must be shut down.

Water source and infrastructure

Tucson's water supply draws from three primary sources: Colorado River water delivered via the Central Arizona Project (CAP) pipeline, stored groundwater from the Tucson Basin aquifer, and a smaller share of local groundwater pumped directly from production wells.

The CAP pipeline carries Colorado River water from Lake Havasu on the Arizona-California border eastward across 336 miles to Tucson, arriving at the Hayden-Udall Water Treatment Plant on the city's south side — the largest water treatment facility in the Tucson Water system. CAP water has historically supplied roughly 50% or more of Tucson's treated water supply, making the Colorado River shortage declarations a direct operational concern rather than a distant upstream problem.

The Tucson Basin aquifer underlies the Tucson metropolitan area and is managed under the framework of the 1980 Arizona Groundwater Management Act and overseen by the Arizona Department of Water Resources. Tucson Water has been recharging this aquifer with surplus CAP water since the late 1990s through the Central Avra Valley Storage and Recovery Project (CAVSARP) and the Southern Avra Valley Storage and Recovery Project (SAVSARP). These facilities inject treated CAP water underground during high-allocation years, then extract it via recovery wells when CAP deliveries are cut. This banked supply is the primary reason Tucson entered the current shortage period in stronger shape than many neighboring utilities.

Tucson also participates in reclaimed water distribution through its Purple Pipe system, which delivers Class A+ reclaimed water from the Agua Nueva Water Reclamation Facility to golf courses, parks, and large commercial irrigators. Expanding reclaimed water use is central to Tucson Water's long-term CAP risk mitigation strategy.

Brown lawn protections in Arizona

Arizona homeowners are protected under ARS § 33-1817, which prohibits HOAs from fining, penalizing, or threatening enforcement action against a property owner whose landscaping has become drought-stressed or dormant because the owner is complying with a government-mandated water restriction. Under the Critical Water Alert issued by Tucson Water, your HOA legally cannot require you to maintain green turf or impose aesthetic penalties for a brown or dormant lawn resulting from the one-day-per-week watering limitation.

ARS § 33-1817 also prohibits HOAs from preventing homeowners from installing drought-tolerant or xeriscape landscaping in place of traditional turf, subject to reasonable rules about design and plant selection. This is particularly relevant in Tucson, where Tucson Water's Xeriscape Incentive Program (ZIP) actively encourages turf replacement with native and desert-adapted plants.

If your HOA sends a compliance notice about your landscape during the Critical Water Alert, use the following as a response template:

"This notice is to inform the HOA that any reduction in landscape appearance at [your address] is a direct result of compliance with the Critical Water Alert currently in effect under Tucson Water (520-791-3242, tucsonaz.gov/water). Under Arizona Revised Statutes § 33-1817, the HOA is prohibited from imposing fines or penalties for drought-related landscape dormancy while a government water restriction is in effect. I am watering on my assigned day in accordance with Tucson Water's current schedule. Please confirm receipt of this notice and that no enforcement action will be taken."

Lawn care during restrictions

Tucson's climate — roughly 12 inches of annual rainfall split between summer monsoons (July–September) and winter rains — means that Bermudagrass lawns in established neighborhoods are the most common turf type, but they are increasingly being replaced under Tucson Water's incentive programs. During the Critical Water Alert, Bermudagrass will likely go dormant and turn brown on a one-day-per-week schedule during peak summer heat, but it is not dead — the root system survives and the grass will green up when watering resumes or monsoon rains arrive. Do not scalp dormant Bermuda in an attempt to revive it; keep mowing height at 1.5–2 inches and wait for conditions to change.

The more sustainable path in Tucson is converting high-water turf to desert-adapted groundcovers, decomposed granite, or native plantings eligible for Tucson Water's Xeriscape Incentive Program (ZIP), which offers rebates per square foot of turf removed and replaced with qualifying low-water alternatives. Tucson's monsoon season provides free supplemental irrigation for established native plants, meaning Blue Grama, desert marigold, and brittlebush require almost no irrigation once rooted — a practical long-term response to multi-year CAP allocation uncertainty.

Common questions about Tucson water restrictions

What is my assigned watering day under Tucson's Critical Water Alert?

Tucson Water assigns outdoor watering days by service address. The fastest way to confirm your specific day is to call Tucson Water directly at 520-791-3242 or log into your account at tucsonaz.gov/water. Do not rely on a neighbor's schedule — assignments can vary by zone and may be updated during an active Critical Water Alert.

Can I water more than once a week if I only use drip irrigation?

Yes. Drip irrigation systems are fully exempt from the one-day-per-week restriction under Tucson Water's current rules. Drip emitters, soaker hoses, and subsurface irrigation do not count against your assigned day. You can run drip irrigation on any day and at any time. The restriction targets spray heads, rotors, and overhead sprinklers.

Can I wash my car at home under Tucson's current restrictions?

Yes, but only using a hand-held hose with a self-closing shut-off nozzle. Leaving a hose running unattended while washing a vehicle is not permitted. If you prefer a drive-through option, commercial car washes that use recirculating water systems are exempt from the restriction and are actually more water-efficient than most home washes.

Does Tucson Water use smart meters to catch watering violations?

Yes. Tucson Water has deployed an Advanced Metering Infrastructure (AMI) network across the service area that records water usage at regular intervals throughout the day. This means the utility can identify accounts with irrigation activity occurring outside permitted hours or on non-assigned days without sending a field inspector. Remote detection through meter data is the primary enforcement tool, supplemented by complaint reports from neighbors.

What rebates does Tucson Water offer for removing my lawn?

Tucson Water administers the Xeriscape Incentive Program (ZIP), which pays rebates per square foot for removing existing turf and replacing it with desert-adapted or low-water landscaping. The program also offers rebates for high-efficiency irrigation equipment, rain barrels, and soil amendments. Visit tucsonaz.gov/water or call 520-791-3242 to get current rebate amounts, as they are periodically adjusted based on program funding. Applications must be submitted before the turf removal begins.

My pool is losing water to evaporation — can I top it off?

Yes. Tucson Water permits pool top-offs to replace evaporation loss during the Critical Water Alert. What is not permitted is draining and fully refilling a pool, which requires prior approval from Tucson Water except for documented structural repairs or health and safety reasons. Tucson's dry desert air can evaporate 1–2 inches of pool water per week in summer, so using a pool cover significantly reduces how often you need to add water.

When will the Critical Water Alert end?

Tucson Water has tied the Critical Water Alert's end date to stabilization of the city's CAP allocation from the Colorado River. There is no fixed calendar date. The restriction will remain in effect until the Tier 2 Shortage on the Colorado River is downgraded and post-2026 CAP allocation guidelines are resolved at the federal level. The Arizona Department of Water Resources publishes regular updates on Colorado River shortage tiers at azwater.gov. Tucson Water will issue a formal public notice when the Alert is lifted or reduced.

Is my HOA allowed to fine me for a brown lawn right now?

No. Under Arizona Revised Statutes § 33-1817, your HOA cannot fine or penalize you for landscape dormancy that results from compliance with Tucson Water's mandatory water restrictions. If your HOA issues a notice about your lawn's appearance, respond in writing, cite ARS § 33-1817, and reference the active Critical Water Alert. Keep a copy of your correspondence and document your compliance with your assigned watering schedule.

What days can I water my lawn in Tucson?

1 assigned day/week Hand watering with a shut-off nozzle is typically allowed any day during permitted hours.

What time can I water in Tucson?

Watering is allowed Early morning or late evening only. Watering outside these hours is a violation even on your assigned day.

What are the fines for watering violations in Tucson?

First offense: Warning first. Repeat violations: Escalating fines. Contact Tucson Water for the full enforcement schedule.

When will water restrictions end in Tucson?

Current Critical Water Alert restrictions are in effect through Until CAP allocation stabilizes. Monitor https://www.tucsonaz.gov/water for the latest status.

Can I hand water during Tucson water restrictions?

Yes. Hand watering with a hose fitted with a shut-off nozzle is generally allowed on any day during permitted hours. Drip irrigation and soaker hoses are also typically exempt from the day-of-week schedule. Confirm specifics with Tucson Water.

How do I report a water waste violation in Tucson?

Contact Tucson Water at 520-791-3242 or visit https://www.tucsonaz.gov/water. Most utilities accept online reports and respond within 48 hours.