Published June 15, 2026

Well Water failed..now what?

Written by Cole Rakes

What It Means When Coliform Is Found in Your Well Water

Coliform bacteria are naturally found in soil, vegetation, and surface water. A positive test doesn’t necessarily mean your water is making you sick—but it does mean something is wrong with the well system.

There are two main categories:

Total Coliform — Indicates a pathway for contamination (cracks, poor seals, surface water intrusion).
E. coli — Indicates fecal contamination and requires immediate action.

Most homeowners in Albemarle, Nelson, and Greene encounter total coliform, especially after heavy rains, drought shifts, or well‑cap failures.

Common Causes of Coliform Contamination

A cracked or loose well cap
Surface runoff entering the well casing
Shallow wells or older hand‑dug wells
Failed grout or casing
Plumbing dead‑legs where water stagnates
Recent plumbing work that introduced bacteria

What Happens Next: The Standard Response Process

Below is a clear, step‑by‑step breakdown of what homeowners typically do after a positive coliform test. This is the part your readers will appreciate most—simple, actionable, and reassuring.

Step‑by‑Step Guide: What to Do After a Positive Coliform Test

Before the guide, here’s a quick visual of the process homeowners follow when coliform is detected.

Confirm the Test Result

Start Here

A second test rules out lab error and determines whether E. coli is present.

Use a certified lab for the follow-up test
Request both Total Coliform and E. coli analysis
Avoid using the kitchen faucet for sampling—use an outdoor spigot or dedicated sample tap

Inspect the Wellhead

Common Issue

Most coliform problems come from physical defects at the well cap or casing.

Check for loose, cracked, or improperly sealed well caps
Look for insect intrusion, debris, or standing water around the casing
Ensure the casing extends at least 12 inches above grade

Shock Chlorinate the Well

Disinfection

A high-dose chlorine treatment kills bacteria throughout the well and plumbing system.

Use a chlorine concentration of 50–200 ppm depending on well depth and volume.

Add chlorine directly into the well casing
Circulate water through all fixtures until chlorine odor is present
Let the system sit 8–12 hours before flushing

Flush and Retest

After disinfection, the system must be cleared and verified clean.

Flush the system until chlorine smell disappears
Wait 5–7 days before retesting
Use the same certified lab for consistency

Address Structural Problems

Long-Term Fix

If coliform returns, the well has a structural vulnerability that must be repaired.

Replace or reseal the well cap
Repair cracked casing or grout
Redirect surface runoff away from the well
Consider adding a UV purification system for ongoing protection

What Homeowners Should Expect After Treatment

If the contamination was minor or caused by a loose cap, shock chlorination often resolves it immediately. If coliform returns, it usually means:

The well is shallow
The casing is compromised
Groundwater conditions are unstable
The well is located downhill from runoff sources

In these cases, long‑term solutions like UV disinfection, wellhead reconstruction, or drainage improvements are recommended.

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