What should I check before buying near a wash?

A dry wash behind a southern Utah lot is one of the most misread features in the whole market. Some buyers see open space and a view. Others see the word flood and walk away from a perfectly good house.

Both reactions skip the same step, which is finding out what the channel actually does. A wash can be the best thing about a lot, giving you permanent open space nobody can build on. A wash can also be the reason a garage fills with mud every few years. The difference is knowable before you buy.

I am Kelsey Earl, a Realtor with Keller Williams South Valley, and this is the checklist I use when a client asks about a specific one.

First, what a wash is

A wash is a natural drainage channel that runs dry most of the year. In Washington County they are everywhere, because that is how water leaves this landscape. Rain falls hard and briefly on ground that sheds rather than absorbs, and the water finds the lowest line.

The feature that catches people out is that it does not have to rain on you. A storm cell sitting over higher ground upstream fills a wash running through a subdivision where the sky is clear. That is normal here and it is the reason “it was not even raining” shows up in so many accounts of local flooding.

The washes carry water a few times a year in a wet year and sometimes not at all in a dry one. That is exactly why they get built next to.

The seven checks

1. Pull the FEMA flood map for the parcel. Free, public, five minutes. It gives you the mapped zone, which drives whether a lender will require flood insurance. Do this before the inspection, not during it, because a flood determination arriving late forces a rushed call. How to check a flood zone covers the mechanics.

2. Measure the vertical, not the horizontal. Distance from the channel matters much less than height above it. A house thirty feet back but level with the channel bottom is in a different position than a house fifteen feet back and twelve feet above it. Stand at the back fence and look at where the channel bed sits relative to the slab.

3. Find out what is upstream. This is the check almost nobody does and it is the one that predicts the future. How much ground drains into this channel, and what is happening to that ground? Desert that is being subdivided absorbs less every year. A channel that handled its watershed comfortably in 2015 may be handling a different watershed now.

4. Look at the grading at the house. Ground should fall away from the foundation on all four sides. On a lot that has had fifteen years of landscaping, raised planters and a new patio, it frequently does not. The most common water-in-the-house problem has nothing to do with the wash and everything to do with a patio poured level with the door.

5. Read the title for a drainage easement. Lots adjoining a channel commonly carry one. It is not a defect, but it limits what you can build on part of your own land, and people discover it when they go to add a shop. Find it in the title review.

6. Ask who maintains the channel. The city, the county, the HOA, a special district, or nobody. The answer changes the risk substantially. A channel that gets cleared of brush and silt on a schedule performs the way it was designed to. One that does not, slowly fills, and a filled channel has less capacity than the one that was engineered.

7. Establish whether it is natural or engineered. An engineered channel has a design capacity, which means somebody calculated a number. A natural wash has whatever capacity it has. Neither is automatically better, but they fail differently, and knowing which one is behind the fence tells you which questions to ask next.

What a wash is worth, honestly

Here is the part that gets lost in the caution.

Open drainage behind a lot usually means no neighbor will ever be built there. In a county building as fast as this one, permanent open space on one side of a property is genuinely valuable and it is the reason some of the better lots in Washington County back onto channels on purpose. The trail systems here often follow the same corridors. Whether buying near trails is worth it covers that side of it.

So I am not telling you to avoid washes. Most of the lots backing onto one are fine, and some are the best value on the street. I am telling you to spend an afternoon knowing which kind you are buying.

The insurance piece

A standard homeowners policy does not cover flood, and that surprises people every single time. If the parcel is in a mapped high-risk zone and the mortgage is federally backed, you will carry a separate flood policy. Outside the zone it is optional.

Plenty of owners outside the mapped zone carry it anyway, and near an active channel that is a defensible choice, because the map is a model of where water is expected to go rather than a commitment about where it will go. Whether flood insurance is worth it in Washington County goes through the reasoning.

The honest caveat

Two true things sit next to each other.

The first is that most washes in most years do nothing at all, and a buyer who treats every channel as a hazard will talk themselves out of good houses and pay more for worse ones.

The second is that this landscape does occasionally produce a water event far outside the ordinary range, and when it does, proximity to a channel is what separates the houses with a problem from the houses without one. Several Washington County cities have that in their recent record, including Washington City and Ivins. Does St. George flood covers the city-level version of the same question.

The mature position is that this is a knowable, checkable, priceable risk, and not a reason for either anxiety or blind confidence.

What to do next

If you are under contract or about to be on a lot backing a wash, do checks one through four this week. They cost nothing and they take an afternoon. Checks five through seven belong in the title review and a call to the city or the HOA.

If the answers come back fine, buy the house and enjoy the open space. If they do not, you will have found out while you still had a choice, which is the entire point.

If you want a second opinion on a specific lot, send me the address and I will tell you what I would look at first.