Why Two Homes on the Same Marana Street Can Carry Two Different Water Bills

"If we keep it the way it is, we will not be sustainable."

That's Marana Water Director Heidi Lasham, explaining to the town council in the fall of 2025 why the utility needed a multi-year rate increase. The board approved it, and the new schedule took effect on February 6, 2026, with more than 10 percent annual increases running through 2030 to catch up on decades of deferred pipe and plant maintenance.

Here's what that warning doesn't tell you if you're shopping for a home in Marana this fall: it only applies to some of the town.

Marana isn't served by one water utility. It's served by two, split by a boundary that has nothing to do with subdivision names, builder logos, or which HOA newsletter lands in your inbox. Depending on which side of that line a specific parcel sits, a buyer could be signing up for Marana Water's climbing rate schedule, or for Tucson Water's, which is on a noticeably gentler trajectory right now. And the split isn't new. It traces back to a 2016 intergovernmental agreement between the Town of Marana and the City of Tucson that carved out which parcels each utility gets to serve, and which ones it doesn't.

One Town, Two Water Companies

Marana Water is the town's own utility, drawing from local well fields in the Avra Valley sub-basin. Tucson Water is the much larger Pima County utility, and it has served pockets inside Marana's town limits for decades, mostly through old developer contracts that predate the current boundary rules. Under Tucson Water's "Non-Expansion Area" policy, those legacy pockets can keep their existing customers but can't grow beyond them.

In practice, that means Dove Mountain and Continental Ranch, two of the better-known master-planned communities in Marana, are Tucson Water customers, while Gladden Farms, Saguaro Bloom, Continental Reserve, and several smaller subdivisions in the Twin Peaks area are Marana Water customers. The 2016 agreement between the two towns spelled out exactly which parcels fall on which side, and it's the reason the town still occasionally has to patch its own paperwork. A Marana impact fee schedule updated as recently as February 2026 includes a line correcting the "Marana Water Resource fee for areas served by Tucson Water," a small bureaucratic detail that confirms the boundary is real enough to keep tripping up the town's own accounting.

A Line Drawn by Policy, Not Geography

The boundary isn't a ridge line or a wash. It's an administrative decision, and the record shows people arguing about exactly that when the current arrangement was being worked out around 2016. Tucson was weighing whether to extend water service to a new school site inside Marana in exchange for handing several other Marana parcels over to Marana Water. One Tucson councilman pushed back hard on the whole idea of moving lines around case by case.

"Why have a water service policy when you can change it on a whim?"

That tension is worth sitting with, because it's still the honest answer to "why does my neighbor have a different water bill than I do." Not soil. Not topography. A negotiated line that shifts when the two towns decide it should.

Two Very Different Rate Trajectories Right Now

The two utilities are not tracking the same path in 2026.

Marana Water's board-approved increase runs more than 10 percent a year from 2026 through 2030, with the first installment landing in February 2026. Lasham has been direct about why: the last full rate study was done in 2019, and operating and maintenance costs are projected to outpace revenue by more than $12 million by 2027 if nothing changes.

Tucson Water is on a calmer path for its existing customer base. In the spring of 2026, the city council opted for a 3.5 percent annual revenue increase for fiscal years 2027 through 2030, a more modest curve than Marana's. And there's a second wrinkle that specifically favors Marana's Tucson Water customers. Back in August 2025, Tucson Water restructured its rates to charge unincorporated Pima County customers 16 to 23 percent more, while explicitly naming incorporated communities, Marana among them, as the group whose average bill would actually drop by about $2 a month. Because Dove Mountain and Continental Ranch sit inside Marana's town limits, their Tucson Water bills fall into that more favorable incorporated tier, even though the utility itself is Tucson's.

So a household in Dove Mountain and a household in Gladden Farms aren't just on different utilities. One is riding a multi-year double-digit increase designed to fix decades of underinvestment. The other benefits from a rate class built for cities and towns, layered under a comparatively gentle multi-year plan.

The Gap Widens With the Meter, Not the Address

Before either utility's most recent increases took effect, a 2025 rate comparison compiled by Oro Valley's utility director laid out how close the two actually were at low usage, and how far apart they got as usage climbed.

At the lower tier, the gap is a rounding error. At the higher tier, it's nearly $35 a month, and that's before Marana's 10 percent annual increases and Tucson's 3.5 percent plan reshape both numbers going forward. A household with a small xeriscape yard and no pool will barely notice which utility serves them. A household with a pool, turf, or a larger irrigated lot, common in several of Marana's family-oriented communities, will feel the difference in July and August, when usage climbs into that second tier and stays there.

The Same Line Once Divided Water Quality, Too

This isn't the first time the boundary has mattered more than the subdivision name. Testing conducted by Marana Water in the years before 2019 turned up 1,4-dioxane and PFAS compounds above EPA health advisory levels in wells serving Saguaro Bloom, Continental Reserve, and several smaller neighborhoods including Happy Acres, La Puerta del Norte, Milligan's Acres, Ironwood Reserve, and Sunset Ranch Estates. Roughly 2,700 households were affected, and the town's own reporting at the time put the cost of building treatment infrastructure at $12 million to $15 million.

Continental Ranch, just a few miles away, was untouched. Not because of soil or luck, but because it draws from a completely separate system operated by Tucson Water. The utility line that decides your rate schedule is the same line that decided, years ago, whose water needed a treatment plan and whose didn't. Anyone curious about current water quality for a specific address can request the most recent consumer confidence report directly from whichever utility serves that parcel, since both publish them.

What This Means If You're Comparing Communities

Buyers weighing Gladden Farms against Dove Mountain, or Continental Ranch against Saguaro Bloom, are usually comparing HOA dues, park access, and floor plans. Fewer are asking who actually bills them for water, and at what trajectory. That question sits underneath the amenity comparison, not beside it, because it changes the real monthly cost of owning the home over the next four years, not just the sticker price on day one.

The utility a home sits on isn't always obvious from the subdivision name, either. Because the boundary was drawn parcel by parcel in 2016 rather than community by community, even later phases of an existing master plan can land on a different side of the line than earlier ones. That's the same reason the town's own fee schedule needed a correction in February 2026.

A Few Things Worth Checking Before You Write

• Ask the listing agent or builder which utility, not just which town, serves the specific parcel. Marana and Tucson Water both publish current rate schedules, and the difference is easy to confirm before you write an offer.
• If the home has a pool or a larger irrigated lot, compare the higher-tier rate, not just the base monthly minimum. That's where the two utilities diverge the most.
• Request the utility's most recent water quality report for the parcel's specific system, especially in the Twin Peaks area subdivisions with a documented testing history.
• Remember that a Community Facilities District tax line and a water utility are two separate things on the same property. A home can carry a CFD assessment and a Marana Water bill, or a CFD assessment and a Tucson Water bill, and the two don't move together.

Frequently Asked Questions

How do I find out which water utility serves a specific Marana address? Ask the listing agent, the builder, or check directly with Marana Water and Tucson Water, both of which can confirm service by parcel. It's a fast call and worth making before you're under contract.

Does being on Tucson Water instead of Marana Water affect resale value? There's no evidence the utility alone moves resale value in either direction. What it does affect is your ongoing cost of ownership, particularly at higher usage levels, which is worth factoring into a long-term affordability picture rather than a resale calculation.

Will new Marana subdivisions default to Marana Water going forward? Not automatically. The boundary follows the 2016 agreement and its parcel-by-parcel designations, and the town continues to update its own fee records as new phases open, which means the line isn't static even now.

Comparing water utilities parcel by parcel isn't the kind of thing most buyers think to do until they're already three months into ownership and staring at a summer bill that doesn't match what a neighbor two streets over is paying. If you're weighing communities in Marana and want a second set of eyes on the details that don't show up in the listing photos, Holiday Homes Family is happy to walk through it with you before you write anything.