"The Colorado River is changing, but thanks to decades of smart water portfolio management, infrastructure investments and your continued dedication to conservation, the future of Oro Valley's water supply remains resilient and secure." That was Oro Valley Water Utility director Peter Abraham's message to customers in the utility's newsletter, as reported by Tucson Local Media. He also wrote that the coming cut "will not alter your water availability."
The accounting backs him up. The full reassurance, though, applies to one utility's customers, and a buyer touring homes around Oro Valley can't take for granted which utility serves the house they like. The Colorado River decision lands on each utility's ledger in its own way, so the useful question during a home search is which ledger an address belongs to.
The town name on a listing is not the water account
Oro Valley Water Utility runs two separate systems. One is the Oro Valley Water Service Area. The other is the Countryside Water Service Area, which the utility's 2026 annual report describes as a small satellite area about two miles west of the Town boundary. So the utility serves customers outside the Town, and its history shows it hasn't been the only provider in the area. The Town's own history of its water system mentions a 2002 settlement involving the Cañada Hills, Metro Water and Rancho Vistoso water companies. Metro Water District says its Main service area runs from Lambert Lane south to River Road, between Thornydale Road and First Avenue/Oracle Road, which reaches up to the Town's southern edge.
We haven't found a published list showing which named Oro Valley neighborhoods are served by which provider, so the check has to be done one address at a time. There are two public tools for it:
- ADWR's Community Water Systems map shows provider service areas and provider details. The Arizona Department of Water Resources warns that some public water systems don't submit maps, so a blank spot may just mean missing data.
- Pima County's water provider GIS layer shows provider boundaries for eastern Pima and southern Pinal counties. It leaves out Tucson Water on purpose and points users to Tucson Water's own layer or to the utility directly.
Three ledgers behind one tap
The cut lands softly for Oro Valley Water Utility customers because of how the utility uses its Colorado River water. In 2025 it produced 9,474 acre-feet of water. That broke down as 4,629 acre-feet of groundwater, 2,863 acre-feet of Central Arizona Project water and 1,982 acre-feet of reclaimed water. The reclaimed water never reaches a kitchen faucet. It irrigates four 18-hole golf courses, the Naranja Park athletic fields and the athletic field at Painted Sky Elementary, and it runs through a system completely separate from drinking water.
The utility's CAP entitlement is 10,305 acre-feet, and it buys the full amount every year. According to the annual report, that water goes three ways:
- Recharged into the aquifer and recovered for delivery to the Oro Valley and Countryside drinking water systems.
- Recharged to earn replacement credit for the groundwater pumped from the utility's wells.
- Recharged and stored at nearby facilities for future use, which earns Long-Term Storage Credits.
The third use is what's left after the first two. The water delivered to taps and the water needed to offset pumping come out first, and whatever remains goes underground as savings. By December 31, 2025, those savings came to an estimated 39,908 acre-feet of storage credits that can be pumped and delivered to the Oro Valley service area. The utility also holds a separate Groundwater Allowance Account of about 19,500 acre-feet, which ADWR granted along with its assured water supply designation.
Where the 1,443 acre-feet comes out
The cut comes out of that savings account. The Bureau of Reclamation's Record of Decision on August 21, 2026, asks every CAP municipal and industrial user to take 14% less water. Abraham told the Town's Water Utility Commission on September 14 that, for Oro Valley, this works out to 1,443 acre-feet, leaving a projected 8,862 acre-feet for the next water year if the estimate holds. Because the utility uses less Colorado River water than it's allocated, Abraham wrote, the cut "only reduces the excess water we would normally store underground; it does not touch the water needed for your taps."
CAP users submit their orders for the next calendar year every October 1, and Abraham said he would again ask for the full 10,305 acre-feet. The Town's September 2026 executive report gives the cut a start date of January 2027.
The longer-term picture matters more to a buyer thinking in decades. In early July 2026, ADWR approved a modification of the Town's Designation of Assured Water Supply. Under it, the utility has shown the state it has enough water to serve the Town for at least the next 100 years. The designation includes the projected water demand of the possible "Tangerine 880" annexation, which is still a proposal and hasn't been annexed. A planned project called NWRRDS is meant to make up to 4,000 more acre-feet of recovered CAP water deliverable each year, and the April 2026 annual report estimated it would be finished in FY 2027.
The systems are also physically connected. In 2012, the Town linked its system to Tucson Water's so that Tucson Water's pipes could carry Oro Valley's CAP water to Oro Valley taps. That connection is about moving water. It doesn't decide which utility bills a given home.
What shows up on the bill instead
The cut won't change what comes out of the tap, but the bill is another matter. The utility's FY 2026/27 rate study recommended raising monthly base rates for drinking water while leaving the per-gallon rates, the groundwater preservation fee and all reclaimed water rates unchanged. A customer with a 5/8-inch meter using 7,000 gallons a month was projected to pay $1.86 more per month.
The Town's posted schedule, labeled as proposed rates effective July 4, 2026, sets a $25.17 monthly base rate for a 5/8-inch meter. Residential usage tiers run $3.02, $5.02, $8.17 and $12.32 per 1,000 gallons, plus a $1.00 groundwater preservation charge per 1,000 gallons of drinking water. With the top tier priced at roughly four times the first, how much water a household uses moves the bill more than the base-rate change does. The Town's conservation page offers water-use tools and residential audits, and it doesn't list a staged shortage schedule or mandatory restrictions.
Same cut, different neighbors
Buyers comparing Oro Valley with Dove Mountain or the Catalina Foothills will run into several utilities, and each is handling the same 14% cut its own way:
| Utility | CAP position | Stated near-term outlook | Recent rate action |
|---|---|---|---|
| Oro Valley Water Utility | 1,443 of 10,305 acre-feet cut in 2027 | Cut reduces stored water, not tap supply | Base rate only; about $1.86 more per month at 7,000 gallons |
| Tucson Water | Allocation a little under 145,000 acre-feet per year | No immediate change in service or daily water-use rules | Annual 3.5% revenue increases; new rates took effect July 6, 2026 |
| Marana Water | 14% cut expected in 2027; CAP is 15% of its portfolio | Stage One drought status, voluntary 5% reduction | 10.5% increase took effect earlier in 2026 |
| Metro Water District | 14% cuts expected in 2027 and 2028, per its August 10, 2026 board record | Stores excess CAP water in groundwater savings facilities | Increase approved; no further increases planned for 2027–2028 |
The table sources are AZPM for Tucson's allocation, the City of Tucson's rate page, Marana's water resources page, Metro Water's August 10 board minutes, and a statewide report on tucson.com for the Marana and Metro rate actions. Metro's board record dates from before the August 21 decision.
Tucson Water's setup is a lot like Oro Valley's. The Arizona Daily Star reported that Tucson Water can legally take nearly 45% more CAP water than its customers use and has been storing the extra underground, which lets it absorb modest cuts without reducing deliveries. Some costs may still come later. KOLD reported on August 27 that a CAP official said water rates at large municipal utilities could rise, while a University of Arizona researcher said Tucson has stored at least six years of supply.
Put together, the four utilities show the pattern. Each has a buffer of stored water, a stated outlook and its own rate path, and an address's utility determines which of those applies.
November 3 adds one more document to the file
Water supply and growth decisions are tied together in Oro Valley right now. Proposition 431, the OV Path Forward General Plan, is on the November 3, 2026 ballot. The Town says it would guide future decisions on roads, parks, safety and growth. The 100-year designation already counts the possible Tangerine 880 annexation, so the water plan is built to cover more growth than the Town has today. For buyers comparing Oro Valley addresses this fall, the general plan and the water designation are worth reading together.
A Few Questions We Hear Often
Does the 14% cut mean water restrictions for Oro Valley homes in 2027? The utility says the cut reduces water it would otherwise store and doesn't affect tap supply. The Town's conservation page lists no mandatory restriction stages.
Will my water bill change because of the cut? For Oro Valley Water Utility customers, the FY 2026/27 rate study recommended raising only the base rate, and its example customer was projected to pay $1.86 more a month. Other utilities have their own rate schedules, which are summarized in the table above.
How do I find out which utility serves a specific home? Look up the address on ADWR's Community Water Systems map and Pima County's provider layer. The Pima layer doesn't include Tucson Water, so a Tucson Water address needs Tucson Water's own map or a call to the utility.
Here's one more detail we track on every Oro Valley-area transaction: which utility serves the home, what its rate schedule looks like and how much stored water stands behind it. If you're comparing addresses and want that information gathered along with everything else, the Tierney Lococo Team will put it together for you before you write an offer. Work With Us.
This article is general information, not legal, tax or financial advice. Consult a qualified professional about your situation.