Complete Guide to Off-Grid Water Systems in Rural Arizona

Water is the single most critical resource for any off-grid property in rural Arizona. Unlike solar power, which you can add incrementally, water access needs to be figured out before you start building. In Cochise County, where annual rainfall averages just 12 to 14 inches, a reliable water system is not optional — it is your lifeline.

This guide covers every water option available to rural Cochise County property owners, with real cost estimates and practical advice from our experience installing dozens of off-grid water systems across the Sulphur Springs Valley.

Understanding Your Water Needs

Before choosing a system, calculate your daily water consumption. A single person living off-grid typically uses 30 to 50 gallons per day for drinking, cooking, cleaning, and basic hygiene. A couple or small family should plan for 75 to 150 gallons daily. If you are running livestock or irrigation, those numbers increase dramatically.

Your storage capacity should cover at minimum two weeks of usage without resupply. For most households in Cochise County, that means 1,500 to 3,000 gallons of storage at a minimum.

Option 1: Hauled Water with Storage Tanks

This is the most common starting point for off-grid properties in the area. A water hauler delivers bulk water to your property and fills a storage tank. In Cochise County, expect to pay between $0.03 and $0.05 per gallon for delivered water, with most haulers requiring a minimum delivery of 1,000 gallons.

You will need a food-grade polyethylene tank rated for potable water. We recommend a minimum of 2,500 gallons for a single-person setup and 5,000 gallons for a family. Tanks should be placed on a level, compacted pad. A good contractor sets tanks on a graded pad with proper base preparation to prevent settling, and positions the tank outlet for gravity feed or easy pump access.

A pressurized delivery system from the tank to your home requires a 12V or 24V demand pump, a pressure tank, and basic plumbing. This setup provides normal household water pressure at every faucet and costs between $500 and $1,200 for parts depending on the complexity.

Option 2: Well Drilling

A private well provides the most reliable long-term water supply, and it is a five-figure decision. Depth is what drives the cost, and depth in this basin has been increasing for decades.

From ADWR's own well registry, across 801 exempt wells in the Sunsites and Pearce area: the median depth across all years is 400 feet, but for wells drilled since 2015 the median is 540 feet, with the middle half falling between 500 and 680. Median recorded static water level at registration is 232 feet. A well drilled in 1985 at 167 feet tells you nothing useful about what you would need to drill today.

We are deliberately not printing a cost-per-foot here. Every figure we could find online came from a lead-capture site with no stated methodology, and they contradict each other by a factor of three. Get two or three written quotes from licensed drillers working this valley, and take the registry depths to that conversation. Our full article on wells and the Willcox AMA has the depth-by-decade breakdown and the permitting steps.

The advantage is independence. Once drilled and equipped, your water cost drops to just the electricity to run the pump, which a solar system can handle easily. A well also significantly increases your property value.

Before drilling, check with the Arizona Department of Water Resources. A domestic well with a pump capacity of 35 gallons per minute or less does not need a groundwater permit — it needs a Notice of Intention to Drill and a licensed well-drilling contractor. That exemption still applies inside an Active Management Area.

Which matters, because the Willcox Active Management Area was designated on 8 January 2025 and covers Willcox, Pearce, Sunsites, Kansas Settlement and Dragoon. Benson, St. David, Sierra Vista and Tombstone are not in any AMA; Douglas, Elfrida and Sunizona are in the Douglas AMA. The designation does not stop you drilling a domestic well, but it changes the filing fee and it changes what the land around you can do.

One more free step before you commit to anything: look up the wells near your parcel on ADWR's Wells 55 registry map. You can read the depth and static water level of every registered well around you, and pull the driller's log once you have a registration number. It is better information than any seller will give you.

Option 3: Rainwater Harvesting

Arizona is one of the most rainwater-harvesting-friendly states in the country. There are no permits required and the state actually encourages it. With a properly sized collection system, even 12 inches of annual rainfall can contribute meaningful water to your supply.

A 1,000-square-foot metal roof collecting 12 inches of rain per year yields approximately 7,500 gallons. A 2,000-square-foot roof doubles that to 15,000 gallons. However, most of this rain falls during the July through September monsoon season, so you need enough storage to carry the surplus through the dry months.

A rainwater system requires gutters, a first-flush diverter to remove debris and contaminants from the initial runoff, and storage tanks. For potable use, add a multi-stage filtration system with sediment filters, carbon filters, and UV sterilization. Budget $3,000 to $8,000 for a complete rainwater collection system depending on roof size and storage capacity.

Filtration and Treatment

Regardless of your water source, proper filtration is essential for off-grid living. At minimum, install a sediment filter to catch particles and a carbon block filter for taste and chemical removal. For well water or rainwater intended for drinking, add UV sterilization to eliminate bacteria and viruses.

A complete whole-house filtration system typically costs $800 to $2,000 installed. We recommend the three-stage approach with a 5-micron sediment filter, a carbon block filter, and a UV light unit. Replace filters every 6 to 12 months depending on water quality and usage.

Combining Systems for Reliability

The most resilient off-grid water setups combine two or more sources. Our recommended approach for Cochise County properties is to start with hauled water and a 3,000-gallon tank for immediate water access, add a rainwater collection system when your roof structure is in place, and plan for a well as a long-term investment when budget allows.

This layered approach gives you water on day one while building toward full independence. Each system backs up the others, so a delayed water delivery or a dry monsoon season never leaves you without water.

Who does the work

The heavy infrastructure for a water system is licensed-contractor work: tank pad grading and preparation, trenching for water lines from tank to house at proper burial depth, delivery and setting of tanks of 3,000 gallons and above, pump system installation including demand pumps and pressure tanks, and connection to new or existing plumbing. Expect a general or excavation contractor for the pad and trench and a plumbing contractor for the pressure side; the tank supplier usually delivers.

Ask each contractor for their ROC licence number and check it at azroc.my.site.com before signing anything.

Get Started

Every off-grid property in Cochise County has unique water challenges based on location, terrain and intended use. Tell us the parcel and the job and a licensed local contractor will call you to quote it — start here.