From how the water system works to what it can grow — this is the knowledge most buyers never get.
The flood irrigation system serving the Greater Phoenix Valley has been running for over 100 years. Water begins as snow in the mountains, melts into the Salt and Verde Rivers, collects in SRP-managed reservoirs, and flows through 131 miles of main canals and 1,000 miles of laterals across the Valley.
On your delivery day, an SRP employee called a Zanjero (sahn-hair'-oh) opens a gate at the top of your neighborhood's system, and water flows by gravity through ditches, pipes, and channels to your property. You open your yard valve, flood your land 2–3 inches deep, and the water soaks in within a few hours — leaving deep moisture that tree roots chase downward for weeks.
SRP manages 746 billion gallons of stored water and delivers 260 billion gallons per year. Most of that water comes from the Salt and Verde watersheds, making it more resilient to Colorado River shortage declarations than CAP-dependent water supplies.
April through September. Neighborhoods receive water approximately every 14 days. Water is delivered 24 hours a day, 7 days a week including holidays.
October through March. Deliveries shift to approximately every 28 days — matching the reduced water needs of dormant and semi-dormant trees.
Each year, canals close for maintenance and no deliveries are scheduled. This typically happens January–February and aligns beautifully with the dormancy period of deciduous trees in Zone 9b. The desert knew what it was doing.
The annual basic charge and fees pay for water storage and system maintenance. You are not paying per delivery — you are paying to keep your account active. Cost varies by district.
In Arizona, flood irrigation water rights are generally appurtenant to the land — a legal term meaning they belong to the property, not the person. When a flood irrigated property sells, the water rights typically transfer with the sale automatically.
This means you are not purchasing water on a per-delivery basis. You are purchasing land that has the legal right to receive it.
Even if a previous owner stopped using their irrigation — paved the yard, filled it with gravel, or simply never activated the account — the water right typically remains with the parcel and can often be reinstated. (Depending on the condition of the infrastructure, reinstating a dormant system may require some investment — which is exactly why getting bids during the inspection period is critical.)
Most flood irrigation in the Greater Phoenix area — including properties served by SRP — draws from the Salt and Verde River watersheds, not the Colorado River. The shortage declarations affecting CAP water supplies do not impact SRP-served residential flood irrigation in the same way. That said, no water source in the desert Southwest is immune to long-term climate pressures, and conservation matters.
"First in time, first in right — Arizona's water law prioritizes the oldest appropriators. The SRP system has been delivering water to these neighborhoods since the early 1900s, making flood irrigation water rights among the most senior and secure in the state."— Camille Fairbanks, Flood Irrigation Specialist
USDA Hardiness Zone 9b is one of the most productive growing zones in North America. Paired with the deep, thorough watering of flood irrigation, it becomes something extraordinary.
Naval oranges, Arizona Sweet, Cara Cara, Meyer lemon, Lisbon, Eureka — citrus thrives in Zone 9b and produces abundantly on flood irrigation.
Desert Gold peach, Katy apricot, Santa Rosa plum — low-chill stone fruit varieties ripen early and prolifically in the Valley with the right watering.
Pakistan mulberry produces enormous, sweet fruit. Figs of nearly any variety thrive here and are among the easiest trees to grow on flood irrigation.
Champagne loquat, guava, pomegranate, and more — Zone 9b supports a surprising range of subtropical fruit that most of the country can only grow in a greenhouse.
Flood irrigation is not uniformly distributed within these areas. I can help you identify specific streets and properties — including those not correctly labeled in the MLS.