source-backed cost index

Radon mitigation cost data report

Name: RadonVerdict radon mitigation cost evidence index
Creator: RadonVerdict
License: https://radonverdict.com/terms

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.

Open cost index View quote ledger

Index snapshot

3126

Cost URLs

3040

Evidence-backed

3019

Measured

102

Local guides

National planning range anchor: $900-$1600. County pages narrow that range with local rules, evidence, and foundation context.

What the report proves

Cost pages are not all treated equally

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

Radon source first

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

Budget, not a bid

The local range helps homeowners compare quotes, but the final contractor price still depends on foundation, routing, fan, sealing, permits, and access.

Quote ledger

Observed feedback

Anonymized quote signals help identify when a modeled range needs local correction or when a high quote is explainable by scope.

Search policy

Hold weak pages back

ZIP and thin county variants are routed for users, not automatically submitted as search pages.

Current search-demand routes

Do not send every query to the same page

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.

Ulster County, NY radon gas testing and mitigation-services searches should land on the testing/levels decision path, then route 4.0+ users to cost. Los Angeles County, CA commercial radon searches need testing protocol, building scope, and quote-screening language before a residential price anchor. Boulder County, CO testing and mitigation queries should connect official county evidence to the local cost path and quote checklist. Loudoun County, VA testing and ZIP-cost demand should bridge from the official county signal into the local cost estimate and seller-credit path. St. Louis County, MO broad local radon searches need the Missouri evidence block, result-band explanation, and contractor quote route in one flow.

Top county evidence table

Twenty county cost pages to inspect first

Ranked by indexing score, demand cohort status, official evidence, and local housing base.

Los Angeles County, CA

Demand cohort local evidence

$1050-$1855

What should a Los Angeles County homeowner budget before calling radon contractors?

Los Angeles County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 9.5% 4.0+ with a local housing base of 3,599,561 units and a modeled planning range of $1050-$1855.

Manual inspection priority: check this URL first when GSC shows discovered or crawled-not-indexed because it is already in a demand cohort.

Evidence

CDC EPHT Network Radon Tests from Labs: 9.5% 4.0+

EPA Zone 2 - 3,599,561 housing units - score 100

Source

Cook County, IL

Evidence-backed local evidence

$1040-$1868

What should a Cook County homeowner budget before calling radon contractors?

Cook County is a strong cost page because it pairs Illinois IEMA-OHS Licensed Radon Measurement Dashboard: 20.6% 4.0+ with a local housing base of 2,261,319 units and a modeled planning range of $1040-$1868.

Manual inspection priority: check that the official evidence block, local cost range, quote ledger CTA, and state hub links render above the fold cleanly.

Evidence

Illinois IEMA-OHS Licensed Radon Measurement Dashboard: 20.6% 4.0+

EPA Zone 2 - 2,261,319 housing units - score 100

Source

Maricopa County, AZ

Evidence-backed local evidence

$925-$1643

What should a Maricopa County homeowner budget before calling radon contractors?

Maricopa County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 17.4% 4.0+ with a local housing base of 1,821,463 units and a modeled planning range of $925-$1643.

Manual inspection priority: check that the official evidence block, local cost range, quote ledger CTA, and state hub links render above the fold cleanly.

Evidence

CDC EPHT Network Radon Tests from Labs: 17.4% 4.0+

EPA Zone 2 - 1,821,463 housing units - score 100

Source

Kings County, NY

Evidence-backed local evidence

$1025-$1813

What should a Kings County homeowner budget before calling radon contractors?

Kings County is a strong cost page because it pairs New York State Health Dept. Residential Radon Test Data: 29.7% 4.0+ with a local housing base of 1,079,551 units and a modeled planning range of $1025-$1813.

Manual inspection priority: check that the official evidence block, local cost range, quote ledger CTA, and state hub links render above the fold cleanly.

Evidence

New York State Health Dept. Residential Radon Test Data: 29.7% 4.0+

EPA Zone 3 - 1,079,551 housing units - score 100

Source

Miami-Dade County, FL

Demand cohort local evidence

$910-$1617

What should a Miami-Dade County homeowner budget before calling radon contractors?

Miami-Dade County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 19.1% 4.0+ with a local housing base of 1,075,278 units and a modeled planning range of $910-$1617.

Manual inspection priority: check this URL first when GSC shows discovered or crawled-not-indexed because it is already in a demand cohort.

Evidence

CDC EPHT Network Radon Tests from Labs: 19.1% 4.0+

EPA Zone 2 - 1,075,278 housing units - score 100

Source

Dallas County, TX

Evidence-backed local evidence

$890-$1583

What should a Dallas County homeowner budget before calling radon contractors?

Dallas County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 8.4% 4.0+ with a local housing base of 1,040,669 units and a modeled planning range of $890-$1583.

Manual inspection priority: check that the official evidence block, local cost range, quote ledger CTA, and state hub links render above the fold cleanly.

Evidence

CDC EPHT Network Radon Tests from Labs: 8.4% 4.0+

EPA Zone 3 - 1,040,669 housing units - score 100

Source

Clark County, NV

Evidence-backed local evidence

$925-$1643

What should a Clark County homeowner budget before calling radon contractors?

Clark County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 8.1% 4.0+ with a local housing base of 923,275 units and a modeled planning range of $925-$1643.

Manual inspection priority: check that the official evidence block, local cost range, quote ledger CTA, and state hub links render above the fold cleanly.

Evidence

CDC EPHT Network Radon Tests from Labs: 8.1% 4.0+

EPA Zone 3 - 923,275 housing units - score 100

Source

New York County, NY

Evidence-backed local evidence

$1025-$1813

What should a New York County homeowner budget before calling radon contractors?

New York County is a strong cost page because it pairs New York State Health Dept. Residential Radon Test Data: 21.9% 4.0+ with a local housing base of 913,058 units and a modeled planning range of $1025-$1813.

Manual inspection priority: check that the official evidence block, local cost range, quote ledger CTA, and state hub links render above the fold cleanly.

Evidence

New York State Health Dept. Residential Radon Test Data: 21.9% 4.0+

EPA Zone 3 - 913,058 housing units - score 100

Source

Riverside County, CA

Evidence-backed local evidence

$1050-$1855

What should a Riverside County homeowner budget before calling radon contractors?

Riverside County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 1.3% 4.0+ with a local housing base of 851,646 units and a modeled planning range of $1050-$1855.

Manual inspection priority: check that the official evidence block, local cost range, quote ledger CTA, and state hub links render above the fold cleanly.

Evidence

CDC EPHT Network Radon Tests from Labs: 1.3% 4.0+

EPA Zone 2 - 851,646 housing units - score 100

Source

Tarrant County, TX

Evidence-backed local evidence

$890-$1583

What should a Tarrant County homeowner budget before calling radon contractors?

Tarrant County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 13% 4.0+ with a local housing base of 812,186 units and a modeled planning range of $890-$1583.

Manual inspection priority: check that the official evidence block, local cost range, quote ledger CTA, and state hub links render above the fold cleanly.

Evidence

CDC EPHT Network Radon Tests from Labs: 13% 4.0+

EPA Zone 3 - 812,186 housing units - score 100

Source

Wayne County, MI

Evidence-backed local evidence

$875-$1558

What should a Wayne County homeowner budget before calling radon contractors?

Wayne County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 17.5% 4.0+ with a local housing base of 792,169 units and a modeled planning range of $875-$1558.

Manual inspection priority: check that the official evidence block, local cost range, quote ledger CTA, and state hub links render above the fold cleanly.

Evidence

CDC EPHT Network Radon Tests from Labs: 17.5% 4.0+

EPA Zone 3 - 792,169 housing units - score 100

Source

San Bernardino County, CA

Evidence-backed local evidence

$1050-$1855

What should a San Bernardino County homeowner budget before calling radon contractors?

San Bernardino County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 4.5% 4.0+ with a local housing base of 733,104 units and a modeled planning range of $1050-$1855.

Manual inspection priority: check that the official evidence block, local cost range, quote ledger CTA, and state hub links render above the fold cleanly.

Evidence

CDC EPHT Network Radon Tests from Labs: 4.5% 4.0+

EPA Zone 2 - 733,104 housing units - score 100

Source

Philadelphia County, PA

Evidence-backed local evidence

$1010-$1817

What should a Philadelphia County homeowner budget before calling radon contractors?

Philadelphia County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 12.4% 4.0+ with a local housing base of 730,630 units and a modeled planning range of $1010-$1817.

Manual inspection priority: check that the official evidence block, local cost range, quote ledger CTA, and state hub links render above the fold cleanly.

Evidence

CDC EPHT Network Radon Tests from Labs: 12.4% 4.0+

EPA Zone 3 - 730,630 housing units - score 100

Source

Santa Clara County, CA

Demand cohort local evidence

$1050-$1855

What should a Santa Clara County homeowner budget before calling radon contractors?

Santa Clara County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 9.2% 4.0+ with a local housing base of 688,287 units and a modeled planning range of $1050-$1855.

Manual inspection priority: check this URL first when GSC shows discovered or crawled-not-indexed because it is already in a demand cohort.

Evidence

CDC EPHT Network Radon Tests from Labs: 9.2% 4.0+

EPA Zone 2 - 688,287 housing units - score 100

Source

Middlesex County, MA

Evidence-backed local evidence

$1000-$1770

What should a Middlesex County homeowner budget before calling radon contractors?

Middlesex County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 22% 4.0+ with a local housing base of 658,555 units and a modeled planning range of $1000-$1770.

Manual inspection priority: check that the official evidence block, local cost range, quote ledger CTA, and state hub links render above the fold cleanly.

Evidence

CDC EPHT Network Radon Tests from Labs: 22% 4.0+

EPA Zone 1 - 658,555 housing units - score 100

Source

Alameda County, CA

Evidence-backed local evidence

$1050-$1855

What should a Alameda County homeowner budget before calling radon contractors?

Alameda County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 6.7% 4.0+ with a local housing base of 622,856 units and a modeled planning range of $1050-$1855.

Manual inspection priority: check that the official evidence block, local cost range, quote ledger CTA, and state hub links render above the fold cleanly.

Evidence

CDC EPHT Network Radon Tests from Labs: 6.7% 4.0+

EPA Zone 2 - 622,856 housing units - score 100

Source

Cuyahoga County, OH

Evidence-backed local evidence

$960-$1732

What should a Cuyahoga County homeowner budget before calling radon contractors?

Cuyahoga County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 21.7% 4.0+ with a local housing base of 615,881 units and a modeled planning range of $960-$1732.

Manual inspection priority: check that the official evidence block, local cost range, quote ledger CTA, and state hub links render above the fold cleanly.

Evidence

CDC EPHT Network Radon Tests from Labs: 21.7% 4.0+

EPA Zone 2 - 615,881 housing units - score 100

Source

Hillsborough, FL

Demand cohort local evidence

$910-$1617

What should a Hillsborough homeowner budget before calling radon contractors?

Hillsborough is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 18.1% 4.0+ with a local housing base of 606,334 units and a modeled planning range of $910-$1617.

Manual inspection priority: check this URL first when GSC shows discovered or crawled-not-indexed because it is already in a demand cohort.

Evidence

CDC EPHT Network Radon Tests from Labs: 18.1% 4.0+

EPA Zone 2 - 606,334 housing units - score 100

Source

Allegheny County, PA

Evidence-backed local evidence

$1010-$1817

What should a Allegheny County homeowner budget before calling radon contractors?

Allegheny County is a strong cost page because it pairs Pennsylvania DEP Radon Test Data by ZIP Code: 5.2 pCi/L average with a local housing base of 602,734 units and a modeled planning range of $1010-$1817.

Manual inspection priority: check that the official evidence block, local cost range, quote ledger CTA, and state hub links render above the fold cleanly.

Evidence

Pennsylvania DEP Radon Test Data by ZIP Code: 5.2 pCi/L average

EPA Zone 1 - 602,734 housing units - score 100

Source

Franklin County, OH

Evidence-backed local evidence

$960-$1732

What should a Franklin County homeowner budget before calling radon contractors?

Franklin County is a strong cost page because it pairs CDC EPHT Network Radon Tests from Labs: 71.9% 4.0+ with a local housing base of 582,701 units and a modeled planning range of $960-$1732.

Manual inspection priority: check that the official evidence block, local cost range, quote ledger CTA, and state hub links render above the fold cleanly.

Evidence

CDC EPHT Network Radon Tests from Labs: 71.9% 4.0+

EPA Zone 1 - 582,701 housing units - score 100

Source

State crawl routes

Best state hubs for discovery

TX Start here

TX has 254 indexable cost counties, including 254 with measured radon evidence behind the cost path.

Top county: Dallas County

Open

GA Start here

GA has 159 indexable cost counties, including 159 with measured radon evidence behind the cost path.

Top county: Fulton County

Open

VA Start here

VA has 133 indexable cost counties, including 133 with measured radon evidence behind the cost path.

Top county: Fairfax County

Open

KY Start here

KY has 120 indexable cost counties, including 120 with measured radon evidence behind the cost path.

Top county: Jefferson County

Open

MO Start here

MO has 115 indexable cost counties, including 115 with measured radon evidence behind the cost path.

Top county: St. Louis County

Open

KS Start here

KS has 105 indexable cost counties, including 105 with measured radon evidence behind the cost path.

Top county: Johnson County

Open

IL Start here

IL has 102 indexable cost counties, including 102 with measured radon evidence behind the cost path.

Top county: Cook County

Open

NC Start here

NC has 100 indexable cost counties, including 100 with measured radon evidence behind the cost path.

Top county: Iredell County

Open

IA Start here

IA has 99 indexable cost counties, including 99 with measured radon evidence behind the cost path.

Top county: Polk County

Open

TN Start here

TN has 95 indexable cost counties, including 95 with measured radon evidence behind the cost path.

Top county: Davidson County

Open

Source inventory

Official evidence feeds behind the index

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

Open full evidence policy