source-backed cost index
This is the public explanation of how RadonVerdict decides which local cost pages deserve search visibility: official radon evidence first, local cost model second, quote-ledger feedback third.
This report separates three layers that often get mixed together: official radon evidence, modeled local mitigation cost, and observed quote signals. That makes the page useful to homeowners, agents, contractors, and journalists without pretending a county average predicts a single house.
Index snapshot
7
Cost URLs
7
Evidence-backed
7
Measured
1
Local guides
National planning range anchor: $900-$1600. County pages narrow that range with local rules, evidence, and foundation context.
What the report proves
The cost directory follows the same eligibility rule as the county cost pages themselves. State hubs, sitemap candidates, and internal links point at pages Google can actually index.
The quote ledger is the feedback loop: official data decides whether a page deserves search, while anonymized quote signals help verify whether the modeled range is realistic in the field.
Official evidence
County pages are strongest when official measurement tables, CDC rows, or state tier maps give the local page a distinct factual reason to exist.
Cost model
The local range helps homeowners compare quotes, but the final contractor price still depends on foundation, routing, fan, sealing, permits, and access.
Quote ledger
Anonymized quote signals help identify when a modeled range needs local correction or when a high quote is explainable by scope.
Search policy
ZIP and thin county variants are routed for users, not automatically submitted as search pages.
Current search-demand routes
Testing, provider, commercial, map, and cost searches need different first answers. This report keeps those routes explicit so a local page can satisfy the query before asking for a lead, quote, or calculator action.
Top county evidence table
Ranked by indexing score, demand cohort status, official evidence, and local housing base.
What should a Plymouth County homeowner budget before calling radon contractors?
Plymouth County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 17% 4.0+ with a local housing base of 215,021 units and a modeled planning range of $1000-$1770.
Manual inspection priority: keep it in the state hub, but do not scale similar pages until this cohort indexes.
Evidence
CDC EPHT Network Radon Tests from Labs: 17% 4.0+
EPA Zone 2 - 215,021 housing units - score 100
SourceWhat should a Utah County homeowner budget before calling radon contractors?
Utah County is a strong cost page because it pairs Utah EPHT Radon Test Kit Results: 43.1% 4.0+ with a local housing base of 195,342 units and a modeled planning range of $910-$1617.
Manual inspection priority: keep it in the state hub, but do not scale similar pages until this cohort indexes.
Evidence
Utah EPHT Radon Test Kit Results: 43.1% 4.0+
EPA Zone 2 - 195,342 housing units - score 100
SourceWhat should a Delaware County homeowner budget before calling radon contractors?
Delaware County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 72.2% 4.0+ with a local housing base of 82,131 units and a modeled planning range of $960-$1732.
Manual inspection priority: keep it in the state hub, but do not scale similar pages until this cohort indexes.
Evidence
CDC EPHT Network Radon Tests from Labs: 72.2% 4.0+
EPA Zone 1 - 82,131 housing units - score 100
SourceWhat should a Medina County homeowner budget before calling radon contractors?
Medina County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 43.4% 4.0+ with a local housing base of 75,138 units and a modeled planning range of $960-$1732.
Manual inspection priority: keep it in the state hub, but do not scale similar pages until this cohort indexes.
Evidence
CDC EPHT Network Radon Tests from Labs: 43.4% 4.0+
EPA Zone 2 - 75,138 housing units - score 100
SourceWhat should a Mesa County homeowner budget before calling radon contractors?
Mesa County is a strong cost page because it pairs Colorado EPHT radon tests: 33.6% 4.0+ with a local housing base of 67,708 units and a modeled planning range of $950-$1685.
Manual inspection priority: check this URL first when GSC shows discovered or crawled-not-indexed because it is already in a demand cohort.
What should a Douglas County homeowner budget before calling radon contractors?
Douglas County is a strong cost page because it pairs Minnesota Health Dept. Indoor Air Unit Radon Test Data: 61.6% 4.0+ with a local housing base of 21,881 units and a modeled planning range of $1010-$1817.
Manual inspection priority: keep it in the state hub, but do not scale similar pages until this cohort indexes.
Evidence
Minnesota Health Dept. Indoor Air Unit Radon Test Data: 61.6% 4.0+
EPA Zone 1 - 21,881 housing units - score 100
SourceWhat should a Transylvania County homeowner budget before calling radon contractors?
Transylvania County is a strong cost page because it pairs North Carolina DHHS Radon Data Map: 305 pCi/L high-end with a local housing base of 19,072 units and a modeled planning range of $875-$1558.
Manual inspection priority: keep it in the state hub, but do not scale similar pages until this cohort indexes.
Evidence
North Carolina DHHS Radon Data Map: 305 pCi/L high-end
EPA Zone 1 - 19,072 housing units - score 73
SourceState crawl routes
OH Focused set
OH has 2 indexable cost counties, including 2 with measured radon evidence behind the cost path.
Top county: Delaware County
CO Focused set
CO has 1 indexable cost counties, including 1 with measured radon evidence behind the cost path.
Top county: Mesa County
MA Focused set
MA has 1 indexable cost counties, including 1 with measured radon evidence behind the cost path.
Top county: Plymouth County
MN Focused set
MN has 1 indexable cost counties, including 1 with measured radon evidence behind the cost path.
Top county: Douglas County
NC Focused set
NC has 1 indexable cost counties, including 1 with measured radon evidence behind the cost path.
Top county: Transylvania County
UT Focused set
UT has 1 indexable cost counties, including 1 with measured radon evidence behind the cost path.
Top county: Utah County
Source inventory
CDC Environmental Public Health Tracking Network Radon Tests from Labs
County measurement summary - 1924 county rows
Virginia Department of Health Radon Testing Results
County measurement summary - 133 county rows
Missouri DHSS Residential Radon Testing in Missouri
County measurement summary - 115 county rows
Kansas Environmental Public Health Tracking Radon Data
County measurement summary - 105 county rows
Illinois IEMA-OHS Licensed Radon Measurement Dashboard
County measurement summary - 100 county rows
North Carolina DHHS Radon Data Map
County measurement summary - 100 county rows