Choosing the Right Location for Your Water Well

Why Well Location Matters More Than You Think

When most people think about drilling a water well, they focus on depth and cost. But there's a decision that comes before any of that — and it might be the most important one you make: where on your property the well goes.

The location you choose affects nearly everything about your well's performance. It determines the quality of your water, how much water the well produces, how vulnerable it is to contamination, and how long it will last. Pick the right spot, and you'll have clean, reliable water for decades. Pick the wrong spot, and you could end up with low yield, contamination issues, or a well that doesn't meet state code — which means starting over at your own expense.

Here in Eastern Washington, where properties are often large and the geology is anything but uniform, well placement deserves careful thought. Let's walk through everything that goes into making that decision.

Washington State Setback Requirements

Before anything else, your well location has to comply with state regulations. The Washington Department of Ecology sets minimum distances — called setbacks — between your well and potential contamination sources or property features. These aren't suggestions; they're legal requirements, and your driller is responsible for following them.

Here are some of the key setback distances to keep in mind:

Septic tank: At least 50 feet from the well
Septic drain field: At least 100 feet from the well
Property lines: Typically a minimum of 5 feet, though local jurisdictions may require more
Buildings and foundations: Generally at least 5 to 10 feet of clearance
Livestock enclosures or barns: At least 50 feet or more, depending on the type of operation
Surface water (creeks, ponds, irrigation ditches): Varies, but usually at least 50 feet

These distances exist to protect your water supply from biological and chemical contamination that can seep through the soil. On a smaller lot, meeting all setback requirements can significantly limit where the well can go — which is exactly why this needs to be figured out early in the planning process.

Site Accessibility: Getting the Rig In

Here's something that surprises a lot of first-time well owners: a drilling rig is a large, heavy truck. We're talking about a vehicle that weighs 40,000 pounds or more, with a mast that needs to be raised vertically at the drill site. That means the location you choose has to be physically reachable.

A few things to consider:

Road access: The rig needs a path from the road to the drill site. Narrow driveways, tight turns, low-hanging branches, and overhead power lines can all be obstacles.
Ground conditions: Soft, muddy ground can't support a rig's weight. Steep slopes are problematic too. The drill site needs to be relatively flat and firm.
Clearance: The mast extends 30 to 40 feet into the air. There must be no overhead obstructions — power lines, tree canopy, or structures — directly above or near the drilling spot.
Turnaround space: The rig needs room to maneuver. If the crew can't get in and out safely, the location won't work regardless of how good the water might be below it.

On large rural properties in the Spokane, Cheney, or Palouse areas, access is usually manageable. But on hillside lots, wooded parcels, or properties with limited road frontage, it pays to walk the site with your driller before committing to a location.

Eastern Washington Geological Considerations

Geology is the factor that makes well placement genuinely complicated in our region. Eastern Washington sits on the Columbia Plateau, which is built from dozens of ancient basalt lava flows stacked on top of each other. Groundwater here moves through fractured zones between those basalt layers, and the depth to productive water can vary enormously — even across a single property.

What does that mean for choosing a location?

Depth varies widely: Your neighbor's well might be 200 feet deep, but yours could need to go 400 feet or more. There's no guarantee that two wells drilled 100 yards apart will hit water at the same depth.
Topography matters: Wells drilled on ridges or hilltops may need to go significantly deeper than those drilled in valleys or near draws where water tends to collect.
Existing well data helps: Well logs from nearby properties — available through the Department of Ecology — can give your driller a general idea of what to expect, even if they can't predict exactly what's under your specific spot.

A driller who has worked extensively in Eastern Washington will have firsthand knowledge of the formations in your area. That experience is worth a lot when it comes to selecting a drill site that gives you the best shot at a productive well.

Contamination Sources to Avoid

Setback requirements cover the basics, but a good well location also considers the broader contamination picture. Think about what's uphill and upstream of your proposed drill site, because groundwater moves — and contaminants travel with it.

Sources to be aware of include:

Septic systems: Both your own and your neighbors'. If you're on a small lot with multiple nearby septic systems, placement gets tricky.
Fuel storage: Diesel tanks, gasoline containers, or old underground storage tanks are serious contamination risks.
Livestock areas: Animal waste introduces bacteria and nitrates into the soil. Wells should be positioned well away from corrals, pastures, and manure storage.
Flood zones and low-lying areas: During spring runoff or heavy storms, low spots can collect surface water carrying all kinds of contaminants. A well in a flood-prone area is at higher risk of surface water infiltration.
Agricultural chemical storage or mixing areas: Herbicides, pesticides, and fertilizers can leach into groundwater if a well is positioned too close to where these products are used or stored.

In rural Eastern Washington, where farming, livestock, and septic systems are all common, these factors come up on nearly every property. Taking the time to think through contamination risk up front saves a lot of trouble down the road.

How a Professional Assesses the Site

When an experienced driller visits your property to evaluate potential well locations, they're looking at everything we've discussed — and more. Here's what that assessment typically involves:

Walking the property to identify all setback constraints, contamination sources, and access routes.
Reviewing well logs from neighboring properties to understand the local geology and expected depth to water.
Evaluating topography to find spots where groundwater is most likely accessible at reasonable depth.
Checking for utilities — underground and overhead — that could interfere with drilling or create safety hazards.
Considering your future plans: Are you planning to add a shop, expand your septic system, or build an outbuilding? The well location needs to work not just for today, but for your property's long-term layout.

A good driller won't just tell you where you can drill. They'll tell you where you should drill — the spot that balances regulations, geology, access, and contamination risk to give you the best possible outcome.

Common Mistakes to Avoid

Over the years, we've seen property owners make a few recurring mistakes when it comes to well placement. Here are the ones that come up most often:

Drilling too close to the septic system. This is the most common issue. People want the well near the house for convenience, but if the septic is also near the house, setback requirements can push the well further away than expected.
Not checking easements and rights-of-way. An easement running through your property could restrict where you can drill. Always review your plat and title documents before finalizing a location.
Choosing the most convenient spot instead of the best spot. The flat area next to the driveway might be easy to reach, but if it's downhill from the neighbor's cattle operation, it's not a good choice.
Skipping the professional assessment. Some property owners try to save money by picking a spot themselves and calling a driller to "just drill here." That approach often leads to problems that cost far more than the assessment would have.
Ignoring future development. A well drilled in the middle of where you plan to build a shop or garage creates an expensive headache later.

Always Get a Professional Assessment

Choosing a well location isn't a decision to make casually or based on a guess. The right spot depends on regulations, geology, contamination risk, access, and your property's long-term plans — all factors that require expertise to evaluate properly.

If you're planning a well on your Eastern Washington property, the smartest first step is to have a licensed driller visit the site and walk it with you. They'll help you understand your options, identify any constraints, and find the location that sets your well up for success from day one. It's a small investment of time that pays off every time you turn on the tap.