An installed system is not a permanent fix
Local measurements and geology — not national boilerplate.
Radon fans run continuously — every hour of every day — and they wear out, generally somewhere in the five-to-ten-year range. When a fan fails in Berks County, the house does not drift back to a mildly elevated level; it returns toward its untreated baseline. Berks County sits directly on the Reading Prong — a Precambrian uranium-bearing gneiss-and-granite belt that is the single most notorious radon formation in the United States. The failure is easy to miss because there is nothing to see or smell. The one indicator is the manometer — the small U-shaped gauge on the pipe. If the liquid in both legs has levelled out, the system is no longer pulling suction and the house is effectively unmitigated.
Sources: EPA Map of Radon Zones (Pennsylvania); PA DEP Radon Division; USGS/PA geology of the Reading Prong; 1984 Watras case documentation
Common failures on Reading radon systems
Around Reading, the systems most in need of repair are often the oldest in the country — Berks County homes were among the first in America to be mitigated after the 1984 Watras discovery, and a system installed decades ago may be on its second or third fan with seals and pipe joints that have never been redone. Pennsylvania requires DEP certification for mitigation contractors, and on Reading Prong geology a repair is not a formality: the formation feeds radon aggressively enough that a failed system can return a house to levels far above the action level, which is why every repair here should end with a documented retest.
The most common call is a dead or dying fan. A fan that has gone silent, or one that has become noticeably louder or started vibrating, is usually at the end of its bearings. Replacement is straightforward, but the replacement fan has to be matched to the original design — an undersized unit will not hold suction under the slab, and an oversized one wastes electricity and can pull conditioned air out of the house.
Other frequent problems: seal failures where the suction point meets the slab or around a sump lid, which let the fan pull room air instead of soil gas; cracked or disconnected pipe, often in an attic run or where the pipe exits; and systems that were undersized from the start and never actually got the house below 4.0 pCi/L. Any repair should end the same way an installation does — with a retest that proves the level came back down.
- Radon fan replacement, sized to the original system design
- Manometer diagnosis — confirming whether the system still pulls suction
- Re-sealing suction points, sump lids, and foundation penetrations
- Repairs and retesting on systems installed by other contractors
Related pages
Every page cites its sources — start where your question is.
Reading Radon System Repair — FAQ
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