Can I still build in Rio Verde Foothills with the water rules?

You can still build a home in Rio Verde Foothills under the current water rules, as long as you line up a legal, working water source before you build. Rio Verde Foothills is unincorporated Maricopa County with no city water line, so a new home runs on one of three things: hauled water delivered to an onsite storage tank, water filled at the new EPCOR fill station that opened January 1, 2026, or a private well. The crisis that made headlines, when neighboring Scottsdale cut off the standpipe these homes relied on, is over. A permanent supplier is now in place. The work for you is proving your water plan, not wondering whether one exists.

Below is the short history of the water fight, where things stand in 2026, and exactly what a new build needs to clear the water question.

What the Rio Verde Foothills water fight was about

The dispute came down to one fact: many Rio Verde Foothills homes have no well and no water line, so they buy water by the truckload. For years, haulers filled their trucks at a standpipe (a public water-fill spigot) owned by the City of Scottsdale, then delivered it to home storage tanks. That worked until Scottsdale, facing its own Colorado River cutbacks, ended that access on January 1, 2023. Hundreds of homes suddenly had no easy place to buy water.

The root cause is an Arizona land rule. Inside an Active Management Area, which includes the Phoenix area, a formal subdivision must prove a 100-year Assured Water Supply before lots can sell, a requirement the Arizona Department of Water Resources (ADWR) runs under the 1980 Groundwater Management Act. But land split into five or fewer parcels, often called a lot split or "wildcat" split, skips that subdivision review. Much of Rio Verde Foothills grew this way, one split at a time, so the homes were never required to lock in a 100-year water source.

The takeaway is that the water gap was a paperwork gap, not a dry-aquifer problem. The land was buildable. The supply chain to fill a water tank is what broke, and that is what got fixed.

It helps to picture how these homes use water day to day. A typical Foothills home keeps a buried or above-ground tank, often 2,500 to 5,000 gallons, and a hauler tops it off every few weeks. The home runs off the tank, not off a pipe in the street. So when the Scottsdale spigot closed, the trucks had nowhere to fill, and full tanks slowly ran down. That is why a single utility decision two towns over could threaten hundreds of homes at once.

How the EPCOR standpipe solved it

The fight ended with a permanent, regulated water supplier, EPCOR, building a new fill station for the community. Two steps got there. First, in 2023 the Arizona Legislature created the temporary Rio Verde Foothills Standpipe District so water could flow again while a long-term fix was built. Second, the Arizona Corporation Commission (ACC), the state agency that regulates private utilities, approved EPCOR's plan on November 29, 2023 to construct and run a dedicated standpipe for the area.

EPCOR finished the facility on schedule. Its fill station opened January 1, 2026, on 176th Street south of Rio Verde Drive, open daily from 7 a.m. to 6 p.m. The temporary standpipe district was dissolved December 31, 2025, the day before. So the stopgap handed off cleanly to the permanent system, with no repeat of the 2023 cutoff.

The cost side is real and worth knowing. The ACC set an initial rate of 16.28 dollars per 1,000 gallons, billed by the gallon and subject to later review. Property owners who want to build also pay a hook-up fee to enroll, reported around 24,000 dollars. EPCOR's own filing framed the supply as finite, with one company attorney telling the Commission, "There's only so much water that we can procure to serve this community." Hauled water is not cheap, but it is now reliable and regulated, which is the part buyers actually needed. These figures move, so confirm the current rate and hook-up fee with EPCOR as of your build date before you budget.

What this means for a new build today

For a new home, the rule is simple: you must show the county a legal water source as part of your plan, and you have three honest options. Pick one before you design the house, because it shapes your site and your monthly cost.

• EPCOR hauled water. You open an EPCOR account in the standpipe service area, install an onsite storage tank, and have a licensed hauler (or yourself, after a safety orientation) deliver water to it. This is the default path for lots with no well.
• Private well. If your parcel can hit usable water, you drill an exempt well, which ADWR defines under A.R.S. 45-454 as a well with a pump rated 35 gallons per minute or less for domestic use. A well removes the monthly hauling cost but carries its own drilling risk and cost.
• Shared well. Some parcels tie into a neighbor's well under a recorded shared well agreement. That can work, but the agreement terms matter a lot, so read them before you buy.

One caution for raw, unbuilt lots. In 2024, ADWR moved to stop new construction tied to splits that lacked a proven water supply, so a parcel's split history and water paperwork can affect whether the county will permit a new home. Confirm your specific lot's water status and permit path with Maricopa County and ADWR before you buy, since this part of the rules is still settling.

What to confirm before you buy a Foothills lot

Before you put money down on a Rio Verde Foothills lot, confirm the water path in writing, because it is the one item that can stall or sink a build. Ask these questions about the specific parcel, not the area in general.

• Is the lot in the EPCOR standpipe service area? Only homes inside the designated area can open an EPCOR account and haul from the new fill station. A parcel just outside the line has a harder water path.
• What is the well outlook? Look at ADWR well records for nearby parcels to see typical depth and yield. A neighbor's 600-foot well is a warning sign for your drilling budget.
• Does the lot already have a tank or well? An existing, working tank or well is real value. A bare lot means you carry the full cost of one of them.
• What is the split history? A parcel created by a recent five-or-fewer lot split may face extra ADWR or county scrutiny on water adequacy before a permit issues.

Get those answers before closing, since fixing a water gap after you own the land is far more expensive than walking away from a bad lot.

Building in Rio Verde Foothills is back to being a normal rural build, with water as the first box to check instead of an open question. For the rest of the rural checklist (well, septic, power, access, and the county permit), see our guide on what you need to build on rural land in Rio Verde, and our walkthrough of how to get water to a home in Rio Verde Foothills. A build-on-your-lot builder like Jematell Homes works in the Foothills and can confirm your water plan, the tank or well details, and the county permit so the water question is settled before the first inspection.

How Jematell Homes helps

We plan water and wastewater early so they never stall your permit. If you are planning a custom home in Scottsdale, Rio Verde, or the greater Phoenix metro, we are happy to walk through your project.

Sources

• EPCOR: Rio Verde Foothills Water Fill Station (start service)
• EPCOR Delivers Water Solution for Rio Verde Foothills, Facility Opens January 1, 2026 (media release)
• Arizona Department of Water Resources: Assured and Adequate Water Supply (AAWS) Overview
• A.R.S. 45-454 (Exemption of small non-irrigation wells; definitions)
• Arizona Corporation Commission