Building a Pool in the Catalina Foothills
Pima County permits, the Hillside Development Zone, rock close to the surface, washes, HOA review and what a Foothills pool costs, from Omni Pool Builders and Design in Tucson.
Short answer: A pool in the Catalina Foothills is permitted by Pima County Development Services, because the Foothills are unincorporated. The County’s rules are lighter than the Town of Oro Valley’s: a 48 inch barrier, a door alarm accepted where the house is part of the barrier, and a cover that limits evaporation before final. The permit has run $300 to $450 on our jobs. What makes a Foothills pool different is the lot: slope, rock close to the surface, washes, the view you are building toward, and an HOA that reviews the plan before the County sees it.
For what the pool itself costs by size and type, see our Tucson pool cost guide. For the County’s full rule set, see pool permit requirements in Pima County. This page covers what is different in the Foothills. Updated November 2026.
Where the Catalina Foothills are
The Catalina Foothills are the unincorporated area on the south slope of the Santa Catalina Mountains, north of River Road, east of Oracle Road and west of Sabino Creek, running up to the Coronado National Forest. Most people draw the line by the Catalina Foothills School District, whose boundary follows First Avenue, Ina Road, Sunrise Drive, Campbell Avenue, River Road, Snyder Road and Camino Seco up to the forest. Parcels at the edges can fall inside the City of Tucson or the Town of Oro Valley, and those are permitted under different rules. Check which authority covers your address before you compare bids.
Who permits your pool in the Foothills and what it costs
Pima County Development Services issues the pool permit, reviews the plans and inspects the pool. Since January 1, 2026 the County has applied the 2024 International Swimming Pool and Spa Code and the 2023 National Electrical Code with its own amendments, adopted by Ordinance 2025-15.
- Permit cost. The County fee schedule has no separate pool line. On our new pool jobs in unincorporated Pima County from 2022 to 2026, the permit and plan review came to $300 to $450. A pool with an attached spa costs a little more to permit.
- Plan review. Typically 8 to 10 business days on our Pima County pool permits. A lot in a regulatory floodplain runs on the Regional Flood Control District schedule, which can add several weeks.
- Barrier. At least 48 inches, measured on the side away from the pool. Every city and town around Tucson requires 60 inches, and we recommend 60 inches everywhere. Where the house is part of the barrier, the County accepts a listed door alarm; self-closing, self-latching door hardware is the alternative and runs about $600 to $1,000 more.
- Cover. A cover that limits evaporation must be on site before the County approves the final inspection. Our solar evaporation cover is about $330 up to 300 square feet and about $440 for 301 to 600 square feet.
- Setbacks. At least 4 feet from any side or rear property line, pool equipment at least 4 feet from the barrier, and no part of the pool inside a 45 degree line drawn from the bottom of any footing. Inspectors do not verify property lines, so if the corner pins are missing, plan on a survey.
The full list, with sources, is on our Pima County pool permit page.
Building on a Foothills lot
Slope and the Hillside Development Zone
Pima County’s Hillside Development Zone applies to any lot with slopes of 15 percent or more that are longer than 50 feet and higher than 7.5 feet. Parts of the upper Foothills fall inside it. The pool excavation itself does not need a grading permit when it is authorized by the building permit, but a hillside lot carries rules that reach the pool, the deck and the walls around it:
- A grading plan with a defined grading area and calculations of proposed and allowable grading, showing the pool, walls, fences, septic and utilities, with existing contours at two foot intervals.
- An allowable graded area set by lot size. A lot of 20,000 to 43,560 square feet gets 10,000 to 17,424 square feet of grading, or 40 percent of the lot if that is more. A lot of one acre to 72,000 square feet gets 17,425 to 21,600 square feet, or 30 percent.
- Grading may extend no more than 6 feet beyond the structural development perimeter, and slopes of 25 percent or more are off limits apart from narrow exceptions.
- No exposed cut or fill slope taller than 15 feet, and retaining walls no more than 10 feet above natural grade, with planting benches on taller slopes.
- Ungraded areas stay fenced and untouched during construction: no stockpiles, no equipment parked on the desert.
- Grading on a slope of 15 percent or more, or a cut or fill over 5 feet and steeper than 3 to 1, triggers a Type I grading permit. The County fee is $66, or $235 in the Hillside Development Zone.
On a hillside lot the question is not whether the pool fits, it is whether the pool, the deck, the equipment pad and the walls fit inside the graded area the lot is allowed. That is decided on the site visit, before the design is drawn.
Rock close to the surface
The Foothills have the shallowest bedrock of any point we have checked around Tucson. USDA soil mapping near Skyline Drive shows soft bedrock at about 16 inches and hard bedrock at about 24 inches. Near Sunrise Drive it shows gravel with a dense layer at about 19 inches. The rock is the gneiss of the Santa Catalinas: a 1961 University of Arizona study mapped Catalina gneiss north of a fault that runs roughly east to west near Pontatoc Road and Campbell Avenue, with softer sand and silt beds south of it. The higher up the slope you are, the sooner the bucket hits rock.
The whole Foothills sits on an alluvial fan coming off the mountain, and the ground moves more than it does on the valley floor. Most Foothills lots get rebar at 6 inches on center, against our usual 6 by 12 schedule, and the sealed engineering for each lot sets the final spacing. The dig takes extra cleanup for the small boulders that come out of it, and the shell usually takes extra shotcrete to fill the voids the rock leaves behind. Shotcrete has to pass behind every bar, and a void behind the steel gets exposed and structurally repaired, never patched over, so rock in the hole means more yardage, not a thinner shell. The PHTA Builder’s Manual notes that a finished pool usually weighs less than the soil removed, so settlement is rarely a problem unless the ground was disturbed, loose or placed as fill, which then has to be recompacted to its original strength or better.
What rock does to the job: a rock hammer on the excavator, more days in the hole, more haul-off, and voids in the rock face that take extra shotcrete. Rock and caliche commonly add $3,000 to $15,000 on a Tucson pool, and on a Foothills lot the rock is priced from the site visit, not from a table. A soils report review or a radar test with an observation letter runs about $500 to $1,000. Ask every bidder how rock is priced, per unit, in writing. See who pays for the soil report and whether excavated material can be reused as fill.
What happens when we hit rock
Our field standard is the same on every Foothills dig. We track excavation depth from a protected benchmark, not from the changing grade or the operator’s eye, and we log the soil, fill, rock, water and utilities as they appear. Over-excavation, soft pockets and cave-ins are mapped and reported, never hidden, and are fixed by an approved method. When the ground in the hole differs from what the engineering assumed, rock where soil was expected, voids, old fill or groundwater, we stop and bring the geotechnical or structural engineer back before we continue. What the hole looks like never substitutes for the engineer’s direction. The PHTA Builder’s Manual classes caliche and hardpan as Type A soils and notes that stable rock can be excavated with vertical walls and stays put, while anything heavy near the hole, including retaining walls, spoil piles and equipment, pushes sideways on the excavation wall, which is why we plan where the spoil goes before the first bucket.
Boulders are not always a haul-off item. When the design can use them, we lift the boulders in the dig path, store them at the back of the lot and reset them after excavation; we did that on a 2026 Foothills job instead of trucking them away. The whole excavation, every exposed condition and every repair is photographed and surveyed before steel covers it, and the full cage, the penetrations and the bonding are photographed and released before shotcrete, so every Foothills shell has a record of what is under it.
Washes, floodplains and erosion hazard setbacks
Foothills lots drain to the Rillito through a set of washes that run south off the mountain. In July 2022 Finger Rock Wash put water through at least 10 homes along Havasu Road in Coronado Foothills Estates, half a mile north of Skyline Drive, and the Regional Flood Control District said flows there have grown since the 2020 Bighorn Fire burned the upper watershed. The County treats these washes seriously, and so do we.
- A floodplain use permit from the Pima County Regional Flood Control District is required before construction for a pool in a regulatory floodplain or erosion hazard area. Regulatory floodplains include areas along any wash with a base flood discharge of 100 cubic feet per second or more, and areas subject to sheet flooding. The District says these permits may take several weeks.
- Every regulatory wash carries an erosion hazard setback, mapped floodplain or not, from 25 feet on small washes to 500 feet on major watercourses, usually measured from the top of the bank. The setback binds structures and septic systems, not pools, walls or fences, but the District recommends keeping every improvement outside it and warns that anything inside may have to be repaired or replaced. An Arizona registered civil engineer can reduce it with a study.
- Often only part of a lot is in a floodplain, so where the pool sits decides whether a permit is needed. On our jobs the permit itself has carried no fee, but the pool equipment usually has to be raised on an 18 inch block platform, which adds about $700 to $1,500.
- Backwash and drain water stay on your property and never go to a street or a wash. A cartridge filter is cleaned by hand and avoids the backwash question.
More on setbacks, septic and floodplain rules.
The view, and where the pool goes
Foothills lots were laid out for privacy, desert vegetation, the natural terrain and mountain views, and most of them slope south, so the mountain is behind the house and the city lights are downhill. That is why so many Foothills pools sit on the downhill side of the lot, with a raised wall, a vanishing edge or both. A pool built out over a slope needs a retaining wall and a deeper, engineered shell on the low side, and the wall, the deck and the exposed slope all count against the hillside grading rules above. A pool pushed uphill toward the house runs into the 45 degree footing rule. The site visit is where we work out which of those your lot allows, and what each one costs. The engineered plan then shows every retaining wall that supports the pool or sits within a 3 to 1 slope of it, which the County requires.
Retaining walls and raised bond beams on a slope
Retaining walls and raised bond beams on a sloped lot are priced from the site visit and from what the engineering requires. At minimum the civil engineer produces a slope engineering sheet, which runs about $400. The wall typically gets a large footing to anchor it into the slope, no less than 18 by 18 inches as a toe-down. We treat the slope and the wall as one system: global stability, wall drainage, the load the pool and deck put on the slope, access and the permanent grading are all coordinated before the dig. A retaining wall with no pressure relief drainage acts as a dam, and that is one of the failure modes we design against. The wall and hardscape work is done under our CR-21 hardscaping and irrigation license, ROC 326882.
On one 2025 Foothills lot just north of the river, the yard fell away below the spa so steeply that we weighed cutting the slope into block terraces so water could get out without eroding the bank. The plan became a rounded walkway with flagstone step pads, rip rap and landscape pockets to stop erosion, with the drainage routed around the lower sitting area. That is the kind of decision the site visit exists for.
HOA and architectural review
Most Foothills subdivisions have an HOA, and many are gated. Pima Canyon Estates, Sin Vacas, La Paloma, Ventana Canyon, Skyline Country Club, Sabino Mountain, Finisterra, Cobblestone, The Summit at Finger Rock, Canyon View, Hacienda del Sol and Catalina Foothills Estates are all gated or guard gated. An HOA architectural committee reviews the pool plan before the County sees it, and its guidelines can restrict wall height, wall color, equipment screening, lighting and how much of the lot is disturbed. An HOA can add to the County’s barrier rules but cannot lower them. Contact your HOA for its current submittal rules; the County permit and the HOA approval are separate, and the Arizona Registrar of Contractors recommends that your contract say who handles the HOA submittal. On our jobs it works like this: you get the HOA’s requirements and hand them to us, we prepare the plan and the paperwork, and we send the package back to you to deliver to the HOA. See what an HOA can and cannot change.
What a Foothills pool costs
Our custom concrete pools run $65,000 to $200,000 installed in 2026. A mid-size pool of about 16 by 32 feet usually runs $85,000 to $130,000, and an attached spa adds about $18,000 to $35,000. The lot is what moves a Foothills pool inside that range, through the items below.
| Foothills item | Typical cost (approximate) |
|---|---|
| Rock or caliche excavation | $3,000 to $15,000, priced from the site visit |
| Soils report review, or a radar test with an observation letter | About $500 to $1,000 |
| Slope engineering sheet from the civil engineer (sloped lots) | About $400 |
| Haul-off, per load | $500 to $1,500 |
| Narrow gate or side yard access | $2,000 to $6,000 |
| Extra depth, each added 6 inches | Up to about $500 |
| Raised walls, vanishing edge, large water features, sloped lot | Pushes the pool into the $130,000 to $200,000 and up range |
| Decking and coping | $10,000 to $25,000 |
| Pool equipment raised on an 18 inch platform (floodplain lots) | About $700 to $1,500 |
| Evaporation cover (required before final) | About $330 up to 300 sq ft, about $440 for 301 to 600 sq ft |
| Pima County permit and plan review | $300 to $450 (our jobs, 2022 to 2026) |
| Type I grading permit, if triggered | $66, or $235 in the Hillside Development Zone (County fee) |
| Permits, engineering and soils report together | $1,000 to $4,000 |
Ranges are rounded from Omni projects in 2026 and are estimates, not quotes. Retaining walls on a sloped Foothills lot are priced from the site visit. Every pool is custom to the owner and the property, and your written proposal sets the price. Full detail in the Tucson pool cost guide.
Foothills neighborhoods
These are the Foothills subdivisions we have built in, with what matters for a pool in each one.
- Catalina Foothills Estates. John Murphey’s original subdivisions from the late 1920s on, with early homes by Josias Joesler. Large lots laid out to keep the desert and the views.
- Skyline Country Club. Golf community established in 1963, gated. USDA maps the shallowest bedrock in the Foothills near Skyline Drive.
- Coronado Foothills Estates. Not gated, platted in the early 1960s before floodplain rules, and crossed by Finger Rock Wash. Check the floodplain status of the lot before you design.
- Ventana Canyon. Ten subdivisions around the Ventana Canyon golf course, started in the mid 1980s, partly guard gated, with golf course and city light views.
- La Paloma. Gated golf community around the Westin La Paloma, started in the mid 1980s, with city light and mountain views.
- Pima Canyon Estates. Guard gated, up to 330 custom homes against the Coronado National Forest, mostly built in the last two decades.
- Sin Vacas. Guard gated, next to Pima Canyon, lots up to an acre, with mountain and city views.
- Cobblestone. Private, high in the Foothills, lots often over an acre, contemporary homes.
- Alta Vista. Not gated, in one of the hilliest parts of the Foothills, with panoramic mountain and city views. Slope rules apply on most lots.
- Sabino Mountain, Finisterra, The Summit at Finger Rock, Canyon View and Hacienda del Sol. Gated subdivisions with HOA review.
How we build a pool in the Foothills
- Site visit. We walk the lot with you, find the corner pins, the septic tank and field if there is one, the washes, the slope and the access route for the excavator. We confirm the parcel is permitted by Pima County and not the City or Oro Valley, and check it against the County floodplain map.
- Design. Our designers build the pool as a 3D model, placed for the view and inside the lot’s setbacks and grading limits, and paint the layout on the ground before anything is dug.
- Engineering. An Arizona registered structural engineer seals the shell design, with the steel schedule set for the ground. Every Omni shell starts at #3 bar on 6 by 12 inch spacing and goes to 6 by 6 on poor ground, with an automatic cover or on a long pool. Retaining walls that support the pool are on the plan. A soils report or radar test goes in when the ground calls for it.
- HOA submittal. You collect the HOA’s requirements, we prepare the plan and the paperwork, and the package goes to your HOA before the County, so the County review is not wasted on a plan the HOA sends back.
- Permit. PDF plans and sealed calculations go to Pima County Development Services, with a floodplain use permit from the Regional Flood Control District where the lot needs one. Plan review has typically taken 8 to 10 business days on our County permits.
- Build. Dig to startup typically takes 6 to 12 weeks, longer in rock. The County inspects the steel and bonding before the shell is shot and the bonding again before the deck, and the barrier and the evaporation cover have to be in place before final. Plan on about 3 to 6 months from contract to swimming.
The step by step schedule is on our pool build process page, and the timeline detail is in how long it takes to build a pool.
Pools we build in the Catalina Foothills
Our 2026 Pool and Hot Tub Alliance International Awards of Excellence gold, in the category for a spa built in conjunction with a swimming pool, went to a Catalina Foothills project: a freestanding spa at the base of the mountain, where the soil and rock called for structural reinforcement with three times the standard rebar, and a retaining wall designed to work as a privacy wall while keeping the mountain view. It is one of Omni’s four 2026 PHTA awards and was featured in AQUA Magazine in October 2026, built with Pentair equipment, an Artistic Pavers deck, a StoneScapes pebble interior and Akua Mosaics tile. We design every barrier, door and cover to the County code in effect on the day we pull the permit, and we build the shell for the ground the site visit finds, not the ground the price assumed.
- Licensed. We are a Tucson pool builder licensed under Arizona ROC KA-5 282151, dual swimming pool contractor, residential and commercial, and ROC CR-21 326882 for hardscaping and irrigation.
- Awarded. 2026 Pool and Hot Tub Alliance International Awards of Excellence: gold for a spa built with a pool, silver for a vanishing edge pool, and bronze in two categories. Arizona Daily Star Readers’ Choice winner, 2019 to 2026.
- Close by. Our design center is at 6640 N Oracle Rd, Suite 130, Tucson, AZ 85704, on Oracle Road at the western edge of the Foothills, with finish, tile and equipment samples.
We also remodel and resurface existing pools, build commercial pools and handle pool removal in the Foothills.
Call (520) 222-8503, request a design consultation or browse our portfolio.
Frequently asked questions about building a pool in the Catalina Foothills
Who issues pool permits in the Catalina Foothills?
Pima County Development Services, because the Catalina Foothills are unincorporated Pima County. Parcels at the edges can fall inside the City of Tucson or the Town of Oro Valley, which issue their own permits under different rules, so check the parcel first.
How much does a pool permit cost in the Catalina Foothills?
On our new pool jobs in unincorporated Pima County from 2022 to 2026, the permit and plan review came to $300 to $450. A pool with an attached spa costs a little more to permit. If the lot triggers a Type I grading permit, the County adds $66, or $235 in the Hillside Development Zone.
How tall does a pool fence have to be in the Catalina Foothills?
Pima County requires at least 48 inches, measured on the side away from the pool, with gates that open outward, self-close and self-latch. The City of Tucson and the towns around it require 60 inches, and we recommend 60 inches everywhere. Where the house is part of the barrier, the County accepts a listed door alarm.
Does the Hillside Development Zone affect a pool?
Yes, on any lot with slopes of 15 percent or more that are longer than 50 feet and higher than 7.5 feet. The pool, deck, walls and equipment pad have to fit inside the graded area the lot is allowed, which is set by lot size, and the grading plan has to show them. Exposed slopes are limited to 15 feet and retaining walls to 10 feet above natural grade, and slopes of 25 percent or more are off limits apart from narrow exceptions.
Is there rock under Catalina Foothills lots?
Often. USDA soil mapping near Skyline Drive shows soft bedrock at about 16 inches and hard bedrock at about 24 inches, the shallowest of any point we have checked around Tucson. Rock and caliche commonly add $3,000 to $15,000 to a Tucson pool, and on a Foothills lot the rock is priced from the site visit.
Do I need a floodplain permit for a pool near a wash in the Foothills?
If the pool is in a regulatory floodplain or erosion hazard area, yes. The Pima County Regional Flood Control District requires a floodplain use permit before construction, and the permit may take several weeks. Regulatory floodplains include areas along any wash with a base flood discharge of 100 cubic feet per second or more. On our jobs the permit itself has carried no fee, but the pool equipment usually has to be raised on an 18 inch block platform, which adds about $700 to $1,500.
How much does a pool cost in the Catalina Foothills?
Our custom concrete pools run $65,000 to $200,000 installed in 2026, and a mid-size pool of about 16 by 32 feet usually runs $85,000 to $130,000. On a Foothills lot, rock, slope, retaining walls, access and haul-off are the items that move the number, and a raised wall or vanishing edge pushes the pool toward the top of the range.
What does a retaining wall for a pool on a sloped Foothills lot involve?
A slope engineering sheet from the civil engineer, about $400, and typically a large footing to anchor the wall into the slope, no less than 18 by 18 inches as a toe-down. The wall is priced from the site visit and from what the engineering requires, and it needs pressure relief drainage so it does not act as a dam.
Do I need HOA approval for a pool in the Catalina Foothills?
Where an HOA exists, yes, and most Foothills subdivisions have one. The HOA architectural review and the County permit are separate. An HOA can add to the County’s barrier rules but cannot lower them. You collect the HOA’s requirements, we prepare the plan and paperwork, and you deliver the package to the HOA.
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