Buying Horse Property Near Washes and Flood Zones in Arizona

Picture Michael and Jennifer on a sunny October afternoon, walking a gorgeous ten-acre parcel in Pinal County. A dry, sandy wash cuts across the back of the property, and Michael is already imagining trail rides along it. It looks like the last place on earth that could ever flood.

Then monsoon season arrives.

If you're buying horse property near washes and flood zones in Arizona, this is flood risk, not flood irrigation, and it's one of the easiest due diligence items to overlook on acreage. Here's what to check before you buy.

Why Does Flooding Matter in the Desert?

According to the National Weather Service, Arizona's monsoon season officially runs from June 15 through September 30. A dry wash is a channel that water can follow when storms hit, so before you buy, you want to know where water goes across the property.

On horse property, that matters for your house, but also for your barn, hay storage, fencing, and horses. Knowing where water goes before you buy is a lot better than finding out during your first monsoon.

If you're thinking of flood irrigation, that's a completely different topic, and it's often a big plus. Read my complete guide to flood irrigation for Arizona owners for that side of the story.

How Do FEMA Flood Zones Work?

FEMA publishes flood maps that assign areas a flood zone. According to FEMA's National Flood Insurance Program, high-risk flood areas begin with the letters A or V on FEMA flood maps. FEMA also notes that over a 30-year mortgage, homes in these high-risk areas have a 1 in 4 chance of flooding at least once.

Moderate- to lower-risk flood areas are designated with the letters B, C, and X. Lower risk doesn't mean no risk. FEMA reports that from 2014 to 2024, nearly one-third of National Flood Insurance Program claims came from outside high-risk flood areas.

When Is Flood Insurance Required?

FEMA says that if you own a property in a high-risk zone and have a government-backed mortgage, you must purchase flood insurance. That's a real ongoing cost, so get a quote during your inspection period, not after closing. Even outside a high-risk zone, flood coverage is worth asking about, especially on property with washes running through it. My article on insurance for Arizona horse property covers the other coverage questions to ask.

How Do You Check a Property's Flood Zone?

1. FEMA Flood Map Service Center. Search the address on FEMA's official flood map site to see the mapped flood zone.

2. Maricopa County. The Flood Control District of Maricopa County has a GIS Floodplain Viewer showing current designated floodplains within the county. You can also fill out a Flood Hazard Information Request Form, and a district representative will send back the flood zone and map information. There is no fee for floodplain determinations from the Flood Control District. Their floodplain team can be reached at 602-506-2419.

3. Pinal County. For questions about a property's flood elevation requirements, call the Pinal County Flood Control District at 520-866-6411.

4. Ask the seller and the neighbors. Has water ever crossed the property, reached the barn, or damaged fencing during a storm?

Then walk the land yourself. Debris caught in fencing, fresh sand spread across a pasture, or eroded banks along a wash are worth asking about. None of those automatically rule a property out, but they tell you where to ask more questions.

Can You Build a Barn or Arena in a Floodplain?

This is where horse property buyers need to pay close attention. Pinal County states that any development proposed within a floodplain requires a Floodplain Use Permit before construction can begin. For single-lot residential development, such as new homes or accessory buildings, the Floodplain Use Permit must be applied for separately from the Building Permit.

If you're planning a new barn, covered arena, or shelter, find out whether that spot is in a floodplain before you buy, and check with your county on the rules that apply. It can affect where you build, what it costs, and how long permitting takes. For planning, see my articles on horse barn requirements in Arizona and 2026 barn and arena build costs.

Questions to Ask Before You Buy

1. What FEMA flood zone is the property in, and do any washes cross it?

2. Will your lender require flood insurance, and what will it cost?

3. Has water ever crossed the property, the driveway, or the barn area during a storm?

4. Are existing barns, arenas, or shelters in a mapped floodplain, and were they permitted?

5. If you plan to build, does your chosen spot require a floodplain permit?

6. Where would your horses go for higher ground if a big storm hits?

Flood risk belongs on your inspection list right alongside the well and septic. My Arizona horse property inspection checklist walks through the rest.

Frequently Asked Questions

How do I know if a property is in a flood zone in Arizona? Search the address on FEMA's Flood Map Service Center, then check with the county. The Flood Control District of Maricopa County offers a GIS Floodplain Viewer and free floodplain determinations, and the Pinal County Flood Control District can answer questions about a property's flood elevation requirements.

Is flood insurance required in Arizona? FEMA says that if you own a property in a high-risk flood zone and have a government-backed mortgage, you must purchase flood insurance.

When is monsoon season in Arizona? According to the National Weather Service, Arizona's monsoon season officially runs from June 15 through September 30. Check the flood zone and ask about past flooding before you buy.

Do I need a permit to build a barn in a Pinal County floodplain? Pinal County requires a Floodplain Use Permit before development in a floodplain, and for single-lot residential development such as accessory buildings, it's applied for separately from the building permit. Call the Pinal County Flood Control District at 520-866-6411 to confirm what your project needs.

The Bottom Line

A dry wash can be a beautiful feature on horse property, but it's also a path for water. Check the flood zone, price out flood insurance, confirm permits for any structures in a floodplain, and ask about past storms. If Michael and Jennifer do that before closing, their first monsoon is something they watch from the porch, not something they clean up after.

Looking at horse property anywhere in the Metro Plex of Arizona and want someone who checks the flood maps before you fall in love? Call or text Kim Williamson at 480-206-1500 or visit ArizonaHorsePropertyForSale.com.

Kim Williamson, REALTOR® | 8x WPRA World Champion | 1,000+ transactions | 24 years selling real estate | 36 years living in Arizona | Real Brokerage | 480-206-1500