The Water File

Arizona water runs on rules that are a century deep and still moving — a court unwound part of the state's groundwater policy in April 2026, and a community on the Valley's northeastern edge got its first permanent hauled-water fill station in January 2026. That is why this page works the way a diligence file should: every claim below carries its source and an as-of date, and anything that could not be verified against its named source is not on the page.

None of it requires an expert to start. Each file is a record you can pull and a phone number that answers. The only deadline that matters is the one already running — the inspection period.

The first question is the simplest and the most skipped: who actually serves this parcel? No state agency keeps a parcel-to-provider lookup — ADWR says plainly that it does not maintain records of which parcels draw from which source (ADWR real-estate FAQ, read July 2026). The record is the seller's water bill, and the confirmation is a phone call.

The town that proves the point is Paradise Valley: four providers serve it — Berneil Water Company, City of Phoenix, City of Scottsdale, and EPCOR — and the street determines the provider. The town publishes a provider-boundary map for exactly this reason (Town of Paradise Valley, read July 2026). Which name is on the meter matters beyond the rate schedule: Scottsdale and Phoenix hold ADWR designations of assured water supply; Berneil and EPCOR's Paradise Valley district do not appear on ADWR's designated list (list of October 9, 2025) — and ADWR's own caveat is that designations “do not necessarily coincide with a city or town's corporate limits.”

Arcadia's green is not a landscaping choice — it is a property right. On SRP-eligible land, the water allotment is tied to the parcel itself: it cannot be bought, sold, or transferred separately, and an owner does not pay for the water — only the annual charges that deliver it. When the deed changes hands, the entitlement follows it; SRP charges an $8.10 name-change fee per deed and the account carries on (SRP shareholder information, owner's manual, and fee schedule, read July 2026).

Verification is direct. SRP publishes a service-territory map, and its Water Contact Center — (602) 236-3333, staffed around the clock — will discuss a specific parcel's status. Two traps are worth naming. First, irrigation is independent of the utility bills: a home can buy water from Scottsdale and power from APS and still hold an SRP irrigation entitlement (SRP sign-up page, July 2026). Second, the basic charge is billed whether or not anyone orders water — the base entitlement is two acre-feet per acre, and on SRP's calendar-year 2027 schedule (published March 2026) a one-acre lot runs $440.65 a year all-in, billed each November and due in early December.

Whether the house drains to a city main or a tank in the yard changes the escrow itself. Arizona rule R18-9-A316 requires the seller of any property served by an on-site wastewater system — conventional septic or an alternative system — to have it inspected by a qualified inspector within six months before the transfer. Maricopa County states the rule “takes precedence over any conflicting terms” in the contract (county Environmental Services, read July 2026). The seller hands the buyer the completed Report of Inspection and every permitting and maintenance document they hold — before close, one report per system.

The buyer inherits one duty that outlasts closing day: filing the Notice of Transfer within 15 calendar days after the transfer — in Maricopa County through the county Permit Center, $50 per parcel. It is a small filing with a deadline that does not care about moving boxes. Put it on the same calendar as the utilities.

Verification starts free: Maricopa County's Online Septic Search returns permitted septic records for a parcel as PDFs at no charge (county portal, confirmed July 2026). A sewered home shows a sewer charge on the utility bill instead — and for those, the sewer-line scope belongs inside the inspection period with the rest of the physical work. A parcel with no septic record and no sewer charge is not a mystery to shrug at; it is a finding to run down before the period ends.

Off the municipal grid — the North Scottsdale fringe, Rio Verde, pockets of the far Valley — the water is the buyer's to prove. Start at ADWR's Well Registry and search by parcel. Then trust it only as far as ADWR does: the department itself cautions that registrations can still name owners from decades back, that the map dot is not the well's physical location, and that it cannot guarantee a parcel has no well — “the best way to tell if a parcel has a well is to physically inspect the property” (ADWR real-estate FAQ, read July 2026).

A shared well is a contract, not a utility. ADWR does not regulate shared-well agreements — no state agency does — and disputes between neighbors are resolved in court (ADWR real-estate FAQ, read July 2026). Read the agreement in full during the inspection period — and confirm whether it is recorded: who pays for the pump, who owns the parcel under the wellhead, what happens when one party stops paying. After closing, the new owner updates the well registration with ADWR form 55-71A — $30 per well, filed with the recorded deed, only for wells physically on the purchased parcel.

Hauled water is the farthest edge, and Rio Verde Foothills is its dated case file. Scottsdale stopped supplying outside-city haulers at the end of 2022; a temporary standpipe district carried the community from October 2023 until it dissolved on December 31, 2025; and EPCOR's permanent fill station opened January 1, 2026 — 26788 N 176th Street, 7 a.m. to 6 p.m. daily, account and PIN required (EPCOR, read July 2026). Eligibility is tied to the parcel's APN and transfers to the new owner at sale, but a lot split can change it, and accounts running past twice the median use for two straight months risk disconnection. Buying there means verifying the parcel's standing with EPCOR — (800) 383-0834 — before the inspection period ends, not after.

Inside an Active Management Area — all of the Valley is one — new subdivisions must demonstrate a 100-year assured water supply before lots are sold, either through their own certificate or through a commitment from a designated provider (ADWR assured-supply program, read July 2026). Scottsdale and Phoenix are designated; the designation belongs to the provider's service area, not the city limits (ADWR designated list, October 9, 2025).

This is also where the rules are actively moving. ADWR paused new groundwater-reliant certificates after its June 2023 model projected unmet demand; a Maricopa County judge invalidated the policies behind that pause on April 21, 2026, and ADWR has said it intends to challenge the decision (HBACA v. ADWR, Maricopa County Superior Court; ADWR statements, July 2026). As of July 2026 the fight is unresolved — which is precisely why this page carries dates.

What it means at the kitchen table: a resale buyer on designated city water is not what that litigation is about. A buyer of a lot, a new build on the fringe, or a home on an undesignated private system should ask one precise question — which instrument covers this parcel's hundred years, a certificate or a designated provider's written commitment — and get the answer in writing. ADWR's assured-supply office answers at (602) 771-8599.

The file reduces to five records and five phone numbers. Print this section and work it top to bottom inside the inspection period — it is built to be finished in days, not weeks.

Each source below was read directly on July 16, 2026, and every factual claim above traces to one of them. Arizona water rules move — when a date here ages, the source is the place to confirm the current rule.

This guide describes public verification channels in general terms. It is educational content — not legal advice, not hydrology, and not a substitute for the advice of an Arizona attorney or a qualified inspector on a specific property. Derek Deardorff is a licensed Arizona real estate salesperson, not an attorney.