Radon Testing & Mitigation guide • Quincy, MA
After Mitigation: Retesting and Keeping the System Honest
The fan is humming and the follow-up test came back low. That is the beginning of the story, not the end.
Radon Testing & Mitigation guide • Quincy, MA
The fan is humming and the follow-up test came back low. That is the beginning of the story, not the end.
Mitigation systems are simple and reliable, but they are mechanical. Mechanical things deserve a maintenance habit.
A post-mitigation test, run after the system has operated for at least 24 hours, is the proof the system works. Get it in writing.
The EPA recommends retesting at least every two years. Fans wear, seals age, foundations settle. The schedule catches drift before it matters.
The U-tube gauge on the pipe shows the fan is pulling. Check it when you check your smoke detectors: a flat reading means the fan needs attention.
New sump pump, foundation crack repair, basement finishing, additions: anything that changes the envelope or the soil contact can change the numbers.
The exterior vent needs to stay unobstructed and above the roofline. Snow, nests, and renovations are the usual culprits when a good system underperforms.
Go look at your system manometer: uneven fluid levels mean the fan is pulling; flat means it is not. Call (857) 754-3949 if the gauge looks wrong or if it has been more than two years since your last test.
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