York County · Pennsylvania
Radon Mitigation in York
Radon mitigation for York (City — county seat, 17401–17408): the ground under it, the housing on it, the county test data, and what a PA DEP-certified system costs and fixes.
Heart of the carbonate York Valley: Ordovician limestone and dolomite, karst voids, soil-filled fracture zones that channel soil gas.
Historic rowhomes and townhouses on unventilated fieldstone and stone foundations; 19th-century stock downtown, post-war rings around it.
ZIP averages 7.4–11.8 pCi/L; downtown 17401 among the highest (~10.6) (PA DEP Radon Test Data by ZIP Code). The county-wide picture: roughly 56% of basement tests at or above 4.0 pCi/L, in EPA Zone 1. Your specific lot needs its own test — soil gas varies house to house even on the same street.
Pennsylvania requires DEP-certified mitigators (Radon Certification Act, 25 Pa. Code Ch. 240 — mandatory since 1988). The standard system is sub-slab depressurization: diagnostic test hole, suction pit, sealed PVC to an in-line fan, discharge above the roofline, manometer, label, post-mitigation test at 24+ hours. Reduction runs 80–99% (EPA); the fix is measured, not promised.
Most single-suction-point systems in the York area run $800–$1,500 installed. PA DEP’s own guidance puts typical installations at $800–$1,200. Crawl-space systems, homes needing a second suction point, or difficult pipe routing push toward $2,000–$3,500.
No. A typical in-line fan draws 60–100 watts — roughly $30–$100 a year depending on fan size and electricity rates — PA DEP guidance ranges the annual operating cost from $30 to over $100.
Ask for the certification number on the written quote and look it up in the PA DEP Radon Services Directory (published monthly, alphabetical by name and county). Certification numbers are printed on every quote and system label.
Under 25 Pa. Code § 240.112: a DEP-approved course, a DEP-approved exam, and one year of professional installation experience (or three years in a related trade). Firms must employ a certified individual in responsible charge, and firm employees need documented initial training plus continuing education every two years.
Well-designed systems reduce radon by 80–99% (EPA). A home testing at 12 pCi/L typically drops to 0.5–2.0 pCi/L. The post-mitigation test — at least 24 hours after fan startup — is the proof, and DEP requires mitigators to recommend one.
Fan size follows the sub-slab material, not the house size. Loose gravel communicates well and needs a small fan; clay-rich or tightly packed fill needs high suction and sometimes two points. The diagnostic test hole decides.