Radon Mitigation in Allentown, PA

Radon Mitigation in Allentown, Pennsylvania

Allentown, Bethlehem, and the Lehigh Valley sit directly on the Reading Prong — a uranium-rich granite and metamorphic rock formation extending from New Jersey through Pennsylvania's Lehigh, Northampton, and Berks Counties. The Reading Prong is responsible for some of the highest indoor radon levels ever recorded in the United States, and is the geological formation where the modern radon awareness movement began in the 1980s (the Stanley Watras incident in neighboring Pottstown). Lehigh Valley homes routinely test 10 to 40 pCi/L or higher.

Why Allentown Has Some of the Nation's Highest Radon

Pennsylvania is EPA Radon Zone 1, and the Lehigh Valley specifically sits on the Reading Prong formation, which is exceptional even within Zone 1. The Prong is composed of Precambrian granite, gneiss, and metamorphic rocks with unusually high uranium concentrations. Unlike many radon risk areas where gas migrates through overlying soils, the Reading Prong's fractured granite bedrock is often directly beneath foundations or just inches below the surface — creating direct, high-volume radon pathways into homes.

Allentown's older rowhouse neighborhoods and Bethlehem's historic housing stock contain many homes built on granite bedrock with minimal foundation barriers. Newer suburban developments in surrounding Lehigh and Northampton Counties — Macungie, Emmaus, Nazareth, and Easton — also sit on Prong geology and test extremely high. The average Lehigh Valley home tests significantly above even Pennsylvania's already-elevated statewide average.

Radon Mitigation Costs in Allentown

A standard radon mitigation system in Allentown costs $1,400 to $3,500 for most homes — higher than national average because the Reading Prong's extremely high radon levels frequently require more powerful fans, multiple suction points, and specialized systems for fractured granite foundations. This includes:

• Sub-slab or sub-membrane depressurization system
• One or more suction points (Prong geology often requires 2+)
• High-capacity radon fan appropriate for 15-40 pCi/L starting levels
• PVC piping routed through home and vented above roofline
• Complete system testing and EPA certification

Cost factors in Allentown:

• Extremely high levels (20+ pCi/L): May need 2-3 suction points and larger fan; add $400-$800
• Fractured granite foundations: Homes built on or near exposed granite require sub-membrane systems or specialized drilling ($1,800-$3,500)
• Older rowhouses: Allentown's dense rowhouse neighborhoods have complex routing ($1,600-$2,600)
• Multiple foundation sections: Homes with additions or garages frequently need 2 suction points

Pennsylvania Radon Standards

Pennsylvania requires EPA-approved certification through NRPP or NRSB for all radon contractors. Given the Lehigh Valley's extreme radon levels, contractor experience with Reading Prong geology is as important as credentials — ask contractors specifically about their experience with high-level homes.

Getting Started in Allentown

Test Your Home — In the Lehigh Valley, testing is urgent. Long-term exposure to 20+ pCi/L represents extreme health risk. Order a test immediately. Results in 2-7 days. Expect levels far above the 4 pCi/L action level.

Get Certified Quotes from Reading Prong Specialists — Not all contractors have experience with 20-40 pCi/L homes. Ask candidates how many high-level homes (above 15 pCi/L) they've mitigated and what their approach is. Avoid contractors who quote based on a single suction point for very high readings.

Verify System Performance — Post-mitigation testing is critical here. The target is below 2 pCi/L even from 30+ pCi/L starting points. A well-designed Reading Prong system achieves this.

Finding a Certified Mitigator in Allentown

Find a Certified Mitigator in Allentown →

The Lehigh Valley has a specialized contractor base due to its national reputation for extremely high radon. Over 80 certified mitigators serve Lehigh and Northampton Counties. Average cost is $1,500-$2,800. This is not a DIY situation — the Reading Prong demands certified, experienced contractors.

The Lehigh Valley sits on the Reading Prong, where some homes test 10-40x the EPA limit. Test today. Mitigate immediately.