When a Well Runs Dry: The Vital Importance of Proper Decommissioning

The Hidden Dangers of Abandoned Wells (And How to Fix Them)

If you have an old, out-of-service well on your property, it’s easy to think of it as just a hole in the ground—something to cover up with a piece of plywood or a heavy rock and forget about.

However, an abandoned well is much more than a landscaping nuisance. It is a direct pipeline to the groundwater aquifer that supplies your drinking water and that of your neighbors. If left untreated, these "zombie wells" can become serious legal liabilities and environmental hazards.

In this post, we’ll break down exactly what well decommissioning is, why the law requires it, and why it is critical to get it done by a professional.

Is Your Old Well a Risk? Use This Checklist.

How do you know if an old well on your property is just dormant or if it's a ticking time bomb? Sometimes the signs of a compromised well are obvious, but often they are subtle.

Before we dive into the laws and the technical process, take a look at the checklist below. We’ve compiled the most common warning signs that indicate an old well needs immediate professional attention.

If you checked off even one box on that list, keep reading to understand why addressing it now is crucial.

What is Well Decommissioning?

Decommissioning (often called "plugging and abandoning") is the process of permanently sealing a well that is no longer in use. This isn't just about putting a lid on top. It involves restoring the geology of the ground to prevent water, surface contaminants, or animals from moving vertically down the borehole.

The "Why": Three Critical Reasons to Decommission

1. Protecting the Groundwater (and Your Health) The most important reason to decommission a well is to protect the aquifer. A well is essentially a puncture wound in the earth’s natural filtering layers. When a well is abandoned without proper sealing, it acts as a funnel.

Rainwater carrying fertilizers, pesticides, animal waste, and septic runoff can flow straight down the open hole, bypassing the soil’s natural filtration and contaminating the pristine groundwater below. If you or your neighbors drill a new well nearby, that contamination can end up in your glass.

2. Physical Safety and Liability We have all heard the tragic news stories of children or pets falling into uncovered or poorly covered wells. Old casings can rot and collapse under the weight of a person or a lawnmower, creating a sudden, dangerous sinkhole.

Beyond the tragedy of injury, as the property owner, you are often legally liable for accidents that occur due to an unsecured well on your land.

3. Preserving Property Value An illegal or abandoned well is a "defect" on your property title. It can complicate real estate transactions, delay sales, or lower your property value. Having a certificate of proper decommissioning acts as proof that you have been a responsible steward of the land.

The Law: It’s Not Optional

In most states and municipalities, decommissioning isn't just a suggestion—it is the law. While regulations vary slightly by location, the general legal framework usually includes:

• Mandatory Timeline: Many states require a well to be decommissioned within a specific window (e.g., 90 days to 1 year) after it has been taken out of service.

• Licensed Contractors: You generally cannot plug a well yourself. The law typically requires the work to be performed by a licensed well driller or pump installer to ensure the seal is watertight.

• Reporting: Once the job is done, a "Well Decommissioning Report" or "Plugging Record" must be filed with the state Department of Ecology or Natural Resources.

Note: Attempting to fill a well with random debris (rocks, trash, or dirt) is illegal almost everywhere. This creates "bridging," where gaps remain in the well, allowing contamination to continue.

What the State Says: Department of Ecology Regulations

In Washington State, well decommissioning is strictly regulated to protect public safety and groundwater resources. According to the Washington State Department of Ecology, property owners are legally required to properly close any well that is abandoned or unusable.

Key Legal Requirements:

• You Cannot DIY: Under Chapter 18.104 RCW (Washington Well Construction Act), decommissioning work must be performed by a licensed well driller. Property owners are not legally permitted to decommission a well themselves.

• Mandatory Reporting: A "Notice of Intent" must be filed with the Department of Ecology at least 72 hours before work begins.

• Liability: Landowners can be held responsible for any groundwater contamination or physical injuries caused by an abandoned well on their property.

The Official Standard: All work must meet the specific standards outlined in WAC 173-160-381 to ensure the well is permanently sealed and no longer poses a threat to the aquifer.

Source Washington State Department of Ecology - Abandoned Wells

The Professional Process: Our Rigorous Protocol

When you hire a professional to decommission your well, we don't just dump cement down the hole and hope for the best. We follow a strict protocol to ensure every legal and safety requirement is met precisely:

1. Assessment: We review the well log (if available) and inspect the site to determine the total depth, diameter, and condition of the well.

2. Clearing Obstructions: We remove old pumps, wiring, debris, and sometimes the casing itself to ensure a clean path for the sealant.

3. Disinfection: We often treat the well with chlorine to ensure we aren't sealing existing bacteria into the aquifer.

4. Tremie Grouting: This is the most technical part. We pump a specialized sealant (usually bentonite clay or neat cement) from the bottom up using a tremie pipe. This ensures the hole is filled completely from bottom to top, displacing any water and leaving no air gaps.

5. Final Capping & Restoration: The final few feet are usually filled with concrete and capped below the frost line so the land can be graded, restored, and safely used again.

   
   

The Bottom Line

Ignoring an old well won't make it go away; it only increases the risk to your family and your wallet. Decommissioning is a one-time investment that seals the path to the aquifer forever, ensuring safe drinking water for generations to come.

Did you spot any warning signs on the checklist above? Don't wait for a collapse or contamination issue. Contact us today for a consultation and let us handle the paperwork and the heavy lifting for you.