Lake Mead is sitting at roughly half its capacity. That number has improved modestly from its 2022 low, but a report this week from Cronkite News makes clear the reprieve is not a resolution: Arizona could face a 77% reduction in its share of Colorado River water as the seven-basin states remain deadlocked on a post-2026 operating framework.

Seventy-seven percent is not a rounding error. Arizona receives about 2.8 million acre-feet from the Colorado annually under current guidelines. A cut of that magnitude would land almost entirely on the Central Arizona Project canal — the infrastructure that moves river water to Phoenix, Tucson, and the farms in between.

What's actually changing

The current operating rules, negotiated after the 2000s drought exposed serious overallocation, expire at the end of 2026. Replacement guidelines have not been finalized. The Cronkite News report signals that if states cannot reach a voluntary agreement, federally imposed cuts could follow a formula that hits Arizona particularly hard because of how water rights were structured in the original 1922 Colorado River Compact. Arizona holds junior rights in key categories, which means it absorbs cuts first.

Municipal utilities in Phoenix and Tucson have spent the last decade building alternative supplies — groundwater banks, reclaimed water systems, and contracts with the Central Arizona Groundwater Replenishment District. The City of Tucson has publicly stated it can operate without Colorado River water for an extended period. The City of Phoenix is in a stronger position than most, but not invulnerable, especially under sustained drought.

Smaller cities and unincorporated communities dependent on the CAP with thinner groundwater banks are more exposed. Agricultural users in Pinal County, who hold the most junior CAP rights, have already seen significant cuts and are not the primary concern for most residential readers of this site.

What this means for households is not imminent tap shutoffs. It means water is going to get more expensive, landscape restrictions are going to tighten, and the gap between households with good water habits and those without is going to widen.

What we'd actually do

Find out who your water provider is and what their Colorado River exposure looks like. This takes one search. Go to your utility's website and look for their annual water resource plan or integrated resource plan. Most Arizona municipal utilities publish these. You want to know what percentage of their supply comes from CAP versus groundwater versus reclaimed water. If your utility is heavily CAP-dependent with limited groundwater backup, that's relevant to every decision below.

Cut outdoor water use by 20% this summer, starting this month. In Arizona, outdoor irrigation typically accounts for 60–70% of residential water use. A drip system audit, raising your irrigation controller's cycle time during cooler overnight hours, and replacing two or three high-water-use plants with xeriscape alternatives can hit that target without meaningful lifestyle change. The Arizona Department of Water Resources maintains a free plant database with water-use ratings for common landscaping species.

Store a two-week supply of drinking water for your household. This is not about Colorado River cuts causing a tap shutoff next month. It's about the general principle that a supply you depend on is under structural stress. FEMA's standard guidance is 72 hours; we think two weeks is more honest for a household in a desert state with aging infrastructure. One gallon per person per day is the baseline. A family of four needs roughly 56 gallons — achievable with commercially filled water containers or a gravity filter system paired with stored tap water in food-grade containers.

Ask your HOA or city about greywater reuse rules. Arizona has relatively permissive greywater rules for laundry-to-landscape systems, meaning water from your washing machine can be legally redirected to irrigate non-edible plants without a permit in most cases. This is a low-cost infrastructure change — typically under $100 in parts — that meaningfully reduces outdoor water demand.

Check your home's water meter for slow leaks. Turn off every fixture and appliance in your home, then watch the meter for 15 minutes. If the dial moves, you have a leak. The average U.S. household loses nearly 10,000 gallons a year to leaks, according to EPA WaterSense data. In a state facing structural supply constraints, that waste has a real cost — financial and civic.

The bigger picture

Arizona has been planning for Colorado River reductions for years. The state is not caught flat-footed, and Phoenix is not going to run dry because of a negotiating deadline. But planning at the utility scale and planning at the household scale are different things, and most Arizona families have done more of one than the other.

Water security is not a prepper topic. It is a desert-living topic. The households that build durable habits now — lower outdoor use, stored reserves, an understanding of where their water actually comes from — are the ones that weather rate increases, use restrictions, and the occasional infrastructure event without crisis. That's the goal: durability, not drama.