# JeffCo Radon > A radon resource by Air Sense Environmental Website: https://jeffcoradon.com Language: en (UTF-8) Charset: UTF-8 Generated: 2026-10-11T17:28:49+00:00 --- # JeffCo Radon A radon information website operated by Air Sense Environmental, not a separate business or local office. Radon testing and mitigation for Jefferson County and south St. Louis County homes. Business entity: https://airsenseenvironmental.com/#organization Owner and named radon professional: Jake Lusby (registry name Jacob Lusby), Illinois IEMA Mitigation Professional license RNM20232346. This profile does not assert that Jake personally reviewed every page. Headquarters: 5237 Old Alton Edwardsville Rd, Edwardsville, IL 62025. Phone: 314-664-9807. Focus area: Arnold, Imperial, Festus, Crystal City, Hillsboro, De Soto, Herculaneum, Barnhart, Oakville, Mehlville. Service areas are not office locations. # Detailed Content ## Pages ### Editorial standards and corrections **Summary:** Skip to contentA radon resource by Air Sense EnvironmentalJeffCo RadonRadon guidesAboutSchedule a visit314-664-9807Home / Editorial standards and correctionsJeffCo Radon / Air SenseEditorial standards and correctionsJeffCo Radon is operated by Air... **Content:** Skip to contentA radon resource by Air Sense Environmental JeffCo RadonRadon guidesAboutSchedule a visit314-664-9807Home / Editorial standards and corrections JeffCo Radon / Air Sense Editorial standards and corrections JeffCo Radon is operated by Air Sense Environmental. This page explains how its content is prepared and corrected. It applies to this website; Air Sense Environmental’s editorial policy covers airsenseenvironmental.com. Request a visitTalk through your next step → 01 Understand the result02 Discuss the property03 Plan the next step How content is prepared Pages and articles are drafted with AI assistance by Air Sense Environmental’s marketing agency. Articles prepared this way carry a disclosure. Health, action-level and testing statements are checked against primary sources such as the U.S. Environmental Protection Agency and the CDC, which are linked on each page. Service, price and scope statements are checked against Air Sense Environmental’s business records. Confirm the actual work, price and any warranty in a written estimate. Jake Lusby is the owner and named radon professional. His name on the site identifies the business expert; it does not mean he personally reviewed every page. Images labeled as AI-generated illustrations are not photographs of customer projects. Reviews and case studies Customer quotes are verbatim excerpts from Google reviews of Air Sense Environmental. Reviewer names are withheld, and each quote links to the full review on Google. Case-study details come from Air Sense Environmental’s published case studies and keep their stated limitations. Corrections To report a possible error, use the contact page and include the page address and the statement. Material corrections are made on the page and in its machine-readable versions. Published corrections are listed in corrections.json. Independence This is not an independent review site, and it does not rank or compare other companies. It is a resource published by Air Sense Environmental. Effective date: October 10, 2026. In this guide Keep reading Radon Mitigation in Jefferson County, MissouriRadon Testing in Jefferson County, MissouriCrawl Space Radon MitigationA real property. A specific plan. Bring your test report and property questions to Air Sense Environmental. Discuss your property → Your next step Make a plan for your property. Ask Air Sense Environmental about testing, system options or an existing radon concern. Request a visit → JeffCo RadonThis site is operated by Air Sense Environmental, which provides the radon services described here. It is a service information site, not a separate local office. 5237 Old Alton Edwardsville Rd, Edwardsville, IL 62025 314-664-9807 Start here HomeAboutContact Radon decisions depend on a property-specific test and the applicable guidance. --- ### Privacy on this website **Summary:** Skip to contentA radon resource by Air Sense EnvironmentalJeffCo RadonRadon guidesAboutSchedule a visit314-664-9807Home / Privacy on this websiteJeffCo Radon / Air SensePrivacy on this websiteJeffCo Radon is a radon information... **Content:** Skip to contentA radon resource by Air Sense Environmental JeffCo RadonRadon guidesAboutSchedule a visit314-664-9807Home / Privacy on this website JeffCo Radon / Air Sense Privacy on this website JeffCo Radon is a radon information website operated by Air Sense Environmental. This page describes what this website itself collects. Air Sense Environmental’s full Privacy, Cookies and Tracking Policy applies to information you send to Air Sense. Request a visitTalk through your next step → 01 Understand the result02 Discuss the property03 Plan the next step Information you choose to send The appointment request form on the contact page is hosted by Air Sense Environmental’s customer-management provider at link.opptywave.com. Information you enter there, such as your name, phone number, email and property details, goes to Air Sense Environmental so it can respond to your request. Phone calls and text messages go directly to Air Sense Environmental. Embedded and linked services Some pages embed a Google Maps listing for Air Sense Environmental. Google may receive technical information such as your IP address when the map loads, under Google’s own privacy terms. Links to Google reviews, government sources and airsenseenvironmental.com open those websites, which have their own policies. Analytics and advertising As of October 10, 2026, this website does not load analytics, advertising or retargeting tags. If that changes, this page will be updated first. Server logs Like most websites, the hosting provider may keep standard server logs, such as IP address, browser type and pages requested, for security and operation. Questions Use the contact page or call 314-664-9807 to ask about or request changes to information you sent. In this guide Keep reading Radon Mitigation in Jefferson County, MissouriRadon Testing in Jefferson County, MissouriCrawl Space Radon MitigationA real property. A specific plan. Bring your test report and property questions to Air Sense Environmental. Discuss your property → Your next step Make a plan for your property. Ask Air Sense Environmental about testing, system options or an existing radon concern. Request a visit → JeffCo RadonThis site is operated by Air Sense Environmental, which provides the radon services described here. It is a service information site, not a separate local office. 5237 Old Alton Edwardsville Rd, Edwardsville, IL 62025 314-664-9807 Start here HomeAboutContact Radon decisions depend on a property-specific test and the applicable guidance. --- ### Provenance and file timestamps **Summary:** Skip to contentA radon resource by Air Sense EnvironmentalJeffCo RadonRadon guidesAboutSchedule a visit314-664-9807Home / Provenance and file timestampsJeffCo Radon / Air SenseProvenance and file timestampsThis page publishes verification records for... **Content:** Skip to contentA radon resource by Air Sense Environmental JeffCo RadonRadon guidesAboutSchedule a visit314-664-9807Home / Provenance and file timestamps JeffCo Radon / Air Sense Provenance and file timestamps This page publishes verification records for the machine-readable files on this website (llms.txt, reference files and related data files). They let anyone check that a file existed in an exact form by a given time and was listed by the key below. Request a visitTalk through your next step → 01 Understand the result02 Discuss the property03 Plan the next step What this proves: the listed bytes existed no later than the timestamp. It does not prove that the content is correct, who wrote it, or legal ownership. Live files are regenerated when the site changes, so verify against the snapshot copies below, not the current live file. Snapshot of 2026-10-10 One manifest, SHA256SUMS, lists the SHA-256 hash of 100 files across ten Air Sense Environmental websites. The manifest carries three independent proofs: an RFC 3161 timestamp token from FreeTSA (SHA256SUMS.freetsa.tsr); an OpenTimestamps proof anchored to the Bitcoin blockchain (SHA256SUMS.ots); a newly created proof stays pending until a block confirms it and is replaced here once complete; an Ed25519 signature (SHA256SUMS.sig) by the Air Sense Environmental microsite provenance key, fingerprint SHA256:JT+7sat5ESA/kQfxzQsMRyX4eKKcc7CCyY3+PTYbip0. The same key is published on each of the ten websites and on airsenseenvironmental.com/provenance/, which ties it to Air Sense Environmental. Download SHA256SUMS SHA256SUMS.sig SHA256SUMS.freetsa.tsr SHA256SUMS.ots allowed_signers provenance-ed25519.pub freetsa-cacert.crt freetsa-tsa.crt This website’s files in the snapshot /.well-known/linkset.json (snapshot copy) 22fa40892f32dc5346194797e4f8d66472a5b1a84dad8d28e6143066d7ecca26 /ai-info.html (snapshot copy) f3c760f807da8f758072a1b8bf730d74adfcf03a864279e543402385f10b734d /entitymap.json (snapshot copy) bc7bb02dcd36d73cc0c43016197682fc7a15022429253fec4386a9eb6a853f0f /llms-full.txt (snapshot copy) ce47b44cb9c22d6abdedcba1d05383264f8afd30a5a22d2d1068425d26976697 /llms-index.json (snapshot copy) 6b8b7e3a0a9854347f9723375b359d533b74cf3fc3c1e31913177be90c6c0f43 /llms.txt (snapshot copy) ef8dffa7b82a79f8b3be3a99f2d2b0a84d59bce73a9c5da302544dbf2fa8510b /okf/manifest.json (snapshot copy) 26787688e7f083afe4c3ef970a466fb621b4498ab680052174f29ea11e77a82f /radon-reference.html (snapshot copy) a346de6b81a9ce0f34db962f1543961c73500fe42808ea8e5a525dee3e437b28 /radon-reference.json (snapshot copy) e36d81a19ae4fd3fd3073cd3ea0e23b6879a14fb490fa41d5176c18680dfcb75 /radon-reference.md (snapshot copy) d56ae0d0c869630905d590bcf183de2d6bd004a27347e8032155af293c4761d7 How to verify Download the files above into one folder, then run: shasum -a 256 -c SHA256SUMS --ignore-missing openssl ts -verify -in SHA256SUMS.freetsa.tsr -data SHA256SUMS -CAfile freetsa-cacert.crt -untrusted freetsa-tsa.crt ots verify SHA256SUMS.ots ssh-keygen -Y verify -f allowed_signers -I provenance@airsenseenvironmental.com -n file -s SHA256SUMS.sig < SHA256SUMS Snapshot copies must sit at the paths shown in SHA256SUMS (for example files/jeffcoradon.com/llms.txt) for the hash check. The OpenTimestamps proof can also be checked at opentimestamps.org. The identifier in the signature command is a label for the key, not a contact address. In this guide Keep reading Radon Mitigation in Jefferson County, MissouriRadon Testing in Jefferson County, MissouriCrawl Space Radon MitigationA real property. A specific plan. Bring your test report and property questions to Air Sense Environmental. Discuss your property → Your next step Make a plan for your property. Ask Air Sense Environmental about testing, system options or an existing radon concern. Request a visit → JeffCo RadonThis site is operated by Air Sense Environmental, which provides the radon services described here. It is a service information site, not a separate local office. 5237 Old Alton Edwardsville Rd, Edwardsville, IL 62025 314-664-9807 Start here HomeAboutContact Radon decisions depend on a property-specific test and the applicable guidance. --- ### Schedule With JeffCo Radon **Summary:** Skip to contentA radon resource by Air Sense EnvironmentalJeffCo RadonRadon guidesAboutSchedule a visit314-664-9807Home / Contact JeffCo RadonJeffCo Radon / Air SenseSchedule With JeffCo RadonBegin a JeffCo service request with the... **Content:** Skip to contentA radon resource by Air Sense Environmental JeffCo RadonRadon guidesAboutSchedule a visit314-664-9807Home / Contact JeffCo Radon JeffCo Radon / Air Sense Schedule With JeffCo Radon Begin a JeffCo service request with the house layout: basement, crawl space, slab or a combination. Air Sense Environmental can be reached at 314-664-9807 to discuss testing and mitigation in Jefferson County. Explain the decision you need to make and any result already available. Request a visitTalk through your next step → Real Air Sense installation photography. 01 Understand the result02 Discuss the property03 Plan the next step What should you include in your request? Identify the property in Arnold, Imperial, Barnhart, Festus, Hillsboro, De Soto or the surrounding area. Note any addition or split-level section, even if it is not the room where the test was performed. Give a phone number for follow-up and your timing constraints. Full property address, including community Foundation areas and connections between them Location of crawl-space doors or other access Unabridged radon test document Purchase deadline or preferred scheduling window What needs to be confirmed before the visit? Check the appointment purpose with Air Sense before preparing the house. Ask what access the visit requires, especially when a crawl-space entrance is behind stored belongings. The date and work scope need direct confirmation after the initial inquiry. For a home under contract, identify who can authorize entry and coordinate with that person. Avoid assuming that a request for a quote also schedules the measurement or installation; establish the next step explicitly. Have a report already? Keep the recorded room location with the result. It helps explain which part of a mixed-foundation house was measured. If you are calling about equipment already installed, have its documentation ready and describe the issue without relying on the system gauge as a radon reading. Request your radon visit Your request goes to Air Sense Environmental. The team will confirm availability and the scope of work. Prefer to speak with someone? Call 314-664-9807. Air Sense Environmental on Google Maps Air Sense Environmental serves properties across the Greater St. Louis bi-state metro from Edwardsville, Illinois. This map shows the business behind this website, not a separate local office. 5237 Old Alton Edwardsville Rd, Edwardsville, IL 62025. Call 314-664-9807 to arrange service at your property. View Air Sense Environmental on Google Maps (opens in a new tab) Sources and further reading Air Sense Environmental: service information In this guide Keep reading Radon Mitigation in Jefferson County, MissouriRadon Testing in Jefferson County, MissouriCrawl Space Radon MitigationA real property. A specific plan. Bring your test report and property questions to Air Sense Environmental. Discuss your property → Your next step Make a plan for your property. Ask Air Sense Environmental about testing, system options or an existing radon concern. Request a visit → JeffCo RadonThis site is operated by Air Sense Environmental, which provides the radon services described here. It is a service information site, not a separate local office. 5237 Old Alton Edwardsville Rd, Edwardsville, IL 62025 314-664-9807 Start here HomeAboutContact Radon decisions depend on a property-specific test and the applicable guidance. --- ### About JeffCo Radon **Summary:** Skip to contentA radon resource by Air Sense EnvironmentalJeffCo RadonRadon guidesAboutSchedule a visit314-664-9807Home / About JeffCo RadonJeffCo Radon / Air SenseAbout JeffCo RadonJeffCo Radon helps Jefferson County homeowners prepare for... **Content:** Skip to contentA radon resource by Air Sense Environmental JeffCo RadonRadon guidesAboutSchedule a visit314-664-9807Home / About JeffCo Radon JeffCo Radon / Air Sense About JeffCo Radon JeffCo Radon helps Jefferson County homeowners prepare for a conversation with Air Sense Environmental about the foundation beneath their home. Its guides focus on testing, crawl spaces and houses with connected foundation types. Service questions go to the same provider at 314-664-9807. Request a visitTalk through your next step → Real Air Sense installation photography. 01 Understand the result02 Discuss the property03 Plan the next step Who is behind this website? Air Sense Environmental is responsible for the services presented on JeffCo Radon. The county-focused name organizes the information for local readers; it is not a separate business location. Photos are drawn from Air Sense’s provided installation assets. They illustrate equipment and construction details without claiming that the pictured job occurred in Arnold, Festus or another Jefferson County community. How should you use this information? A house may have more than one ground-contact area to describe. Use these pages to think through the original basement, a crawl space or an addition before requesting work. The goal is a complete description of the building, supported by its actual radon measurement. Include later additions when explaining the layout. Locate available access to each foundation area. Distinguish an indoor test result from a system indicator. How do you request a visit? Phone 314-664-9807 or send a request through the contact page. State whether you need a first test, help discussing a result or an assessment of an existing installation. Include the address so service details can be confirmed for that property. Sources and further reading Air Sense Environmental: service information In this guide Keep reading Radon Mitigation in Jefferson County, MissouriRadon Testing in Jefferson County, MissouriCrawl Space Radon MitigationA real property. A specific plan. Bring your test report and property questions to Air Sense Environmental. Discuss your property → Your next step Make a plan for your property. Ask Air Sense Environmental about testing, system options or an existing radon concern. Request a visit → JeffCo RadonThis site is operated by Air Sense Environmental, which provides the radon services described here. It is a service information site, not a separate local office. 5237 Old Alton Edwardsville Rd, Edwardsville, IL 62025 314-664-9807 Start here HomeAboutContact Radon decisions depend on a property-specific test and the applicable guidance. --- ### Crawl Space Radon Mitigation **Summary:** Skip to contentA radon resource by Air Sense EnvironmentalJeffCo RadonRadon guidesAboutSchedule a visit314-664-9807Home / Crawl Space Radon Mitigation in Jefferson County, MOJeffCo Radon / Air SenseCrawl Space Radon MitigationCrawl space... **Content:** Skip to contentA radon resource by Air Sense Environmental JeffCo RadonRadon guidesAboutSchedule a visit314-664-9807Home / Crawl Space Radon Mitigation in Jefferson County, MO JeffCo Radon / Air Sense Crawl Space Radon Mitigation Crawl space radon mitigation addresses soil gas beneath the house, often with a sealed membrane and a collection system beneath it. A Jefferson County home with both a basement and crawl space needs those areas considered together. Covering the ground is only one part of that discussion. Request a visitTalk through your next step → Real Air Sense installation photography. 01 Understand the result02 Discuss the property03 Plan the next step Do homes with crawl spaces have radon? Homes with crawl spaces can have elevated indoor radon. The relevant measurement is in the home under an appropriate test plan, not an assumption based on what the crawl space looks or smells like. A crawl-space addition may be easy to overlook when most of the house sits over a basement. Tell the provider which rooms are above it and where access is located. If the space is difficult to enter, describe the opening and share existing photographs rather than taking unnecessary risks. Identify rooms above the crawl space. Show where the addition meets the original house. Provide the indoor-air test report. How do you get rid of radon in a crawl space? One established approach is sub-membrane depressurization: a collection arrangement beneath sealed sheeting connected to a fan and vent. EPA’s consumer guide describes this method for crawl-space homes. The actual design needs an assessment of the foundation and access. Ask whether the proposal includes ground preparation, membrane details and treatment of piers or other interruptions. Those are useful scope questions, not instructions to install a system yourself. If the basement and crawl space are connected, ask how the plan addresses both. Keep a record of the layout once work is complete. Future plumbing or electrical work should take the membrane and piping into account. Ask how penetrations are handled. Clarify access and preparation work. Document the membrane and pipe arrangement. Agree on a radon verification test. Is crawl space encapsulation the same as radon mitigation? Encapsulation and radon mitigation are not interchangeable descriptions of a completed result. A membrane may be part of both projects, but radon performance needs its own design and verification. A clean-looking crawl space does not establish the indoor radon concentration. If you already have a liner, ask whether it is suitable for the proposed radon work. Share who installed it and whether any later repairs were made. Do not assume a new liner is always necessary, or that an existing one can always be reused. Air Sense’s assessment can identify the scope to discuss for your property. This page does not promise a particular membrane system before an inspection. How much does it cost to install radon mitigation in a crawl space? A crawl-space project needs an individual quote. Access, area, existing materials, penetrations and the relationship to other foundation sections can change the proposed work. The standard sub-slab price range is not a reliable ceiling for a membrane project. Request a scope that separates preparation, membrane work, collection piping, power and testing. If another contractor will prepare the space, agree on the handoff before scheduling the radon installation. For a Hillsboro or De Soto address, include location details when confirming the visit. Clarify what must be cleared beforehand. Identify work by other contractors. Request an itemized written scope. Questions before you book Can an existing crawl-space liner be reused?It needs assessment. The professional should evaluate its condition, seams, attachments and suitability for the proposed radon system. Does the crawl space need to be tested instead of the house?Ask for a measurement plan for the occupied building. A crawl-space reading alone should not be treated as the result for living areas. Sources and further reading EPA: consumer guide to radon reduction In this guide Keep reading Radon Mitigation in Jefferson County, MissouriRadon Testing in Jefferson County, MissouriA real property. A specific plan. Bring your test report and property questions to Air Sense Environmental. Discuss your property → Your next step Make a plan for your property. Ask Air Sense Environmental about testing, system options or an existing radon concern. Request a visit → JeffCo RadonThis site is operated by Air Sense Environmental, which provides the radon services described here. It is a service information site, not a separate local office. 5237 Old Alton Edwardsville Rd, Edwardsville, IL 62025 314-664-9807 Start here HomeAboutContact Radon decisions depend on a property-specific test and the applicable guidance. --- ### Radon Testing in Jefferson County, Missouri **Summary:** Skip to contentA radon resource by Air Sense EnvironmentalJeffCo RadonRadon guidesAboutSchedule a visit314-664-9807Home / Radon Testing in Jefferson County, MOJeffCo Radon / Air SenseRadon Testing in Jefferson County, MissouriFor radon... **Content:** Skip to contentA radon resource by Air Sense Environmental JeffCo RadonRadon guidesAboutSchedule a visit314-664-9807Home / Radon Testing in Jefferson County, MO JeffCo Radon / Air Sense Radon Testing in Jefferson County, Missouri For radon testing, Jefferson County, MO homeowners should explain how the house is built and which lower-level rooms are used. A basement, adjoining crawl space and later addition may need separate attention in the measurement plan. Discuss your radon testing purpose and timing with Air Sense Environmental before booking, especially when the report must support a real estate decision. Request a visitTalk through your next step → Real Air Sense installation photography. 01 Understand the result02 Discuss the property03 Plan the next step How do you test a Jefferson County home for radon? Start by telling the measurement professional why you need the test and how the foundation is arranged. A home-sale deadline, an occupied basement and a planned addition each provide useful context. Have the professional explain where equipment belongs and what the report will cover. For a split-level home in Arnold, sketch the lower floors rather than describing everything as one basement. For a Festus property with a crawl-space addition, mark the room above it. The point is to give the tester a clear picture of the separate areas. Request written preparation instructions and distribute them to everyone using the house. Keep pets and cleaning routines away from the device. If renovation work or a ventilation change is scheduled, disclose it before the appointment. Describe each foundation section. State whether the test is for a sale. Identify rooms used regularly. Keep placement and timing instructions. What are the odds of a house having radon? A county dataset cannot assign a reliable probability to your individual house. Missouri’s residential radon dashboard provides Jefferson County results, but those records represent the homes tested through the program. They are not a random inspection of every property. The useful question is whether your current report represents the rooms and conditions you care about. A neighbor’s result, a real estate listing or a general county map does not answer it. A documented measurement in the actual house gives you a basis for the decision. When reviewing a past report, identify the address, test dates, device location and whether a radon system was running. Save the whole report. A screenshot of the final number may leave out conditions important to interpreting it. Use the county dashboard as context. Avoid substituting nearby results. Check the date and location of older tests. What time of year is worse for radon? There is no single worst month that can predict every Jefferson County home. Weather and building operation can affect measurements, so a short test describes its test period. Ask the measurement professional whether additional testing would help answer your longer-term question. Do not delay an overdue test just to wait for a supposedly ideal season. If your deadline is a sale, discuss the available measurement window. If you are assessing an occupied home without a deadline, ask how a longer measurement might fit the decision. Tell Air Sense about recent flooding, foundation work or changes to the lower-level rooms when arranging the visit. Those details help explain the property’s current condition without claiming any one event proves a high result. Record the purpose of the test. Discuss short and longer measurement options. Confirm reporting time before an inspection deadline. Ask what follow-up the result warrants. Questions before you book Can a house without a basement have radon?A basement is not required for radon to enter a building. Explain slab and crawl-space areas when arranging the measurement. Should I test before converting a room to a bedroom?Include the planned bedroom in your discussion with the tester. Ask which placement and follow-up will inform use of that space. Can I compare two reports directly?Compare their test dates, locations, methods and operating conditions as well as the numbers. Ask the professional to explain material differences. Sources and further reading Missouri residential radon dashboardEPA: home buyer and seller radon guide In this guide Keep reading Radon Mitigation in Jefferson County, MissouriCrawl Space Radon MitigationA real property. A specific plan. Bring your test report and property questions to Air Sense Environmental. Discuss your property → Your next step Make a plan for your property. Ask Air Sense Environmental about testing, system options or an existing radon concern. Request a visit → JeffCo RadonThis site is operated by Air Sense Environmental, which provides the radon services described here. It is a service information site, not a separate local office. 5237 Old Alton Edwardsville Rd, Edwardsville, IL 62025 314-664-9807 Start here HomeAboutContact Radon decisions depend on a property-specific test and the applicable guidance. --- ### Radon Mitigation in Jefferson County, Missouri **Summary:** Skip to contentA radon resource by Air Sense EnvironmentalJeffCo RadonRadon guidesAboutSchedule a visit314-664-9807JeffCo Radon / Air SenseRadon Mitigation in Jefferson County, MissouriFor radon mitigation, Jefferson County, MO homeowners need a... **Content:** Skip to contentA radon resource by Air Sense Environmental JeffCo RadonRadon guidesAboutSchedule a visit314-664-9807JeffCo Radon / Air Sense Radon Mitigation in Jefferson County, Missouri For radon mitigation, Jefferson County, MO homeowners need a system designed around the actual foundation. A basement connected to a crawl space, a split-level house or a ranch with an addition can require different suction arrangements. Air Sense Environmental can discuss the radon test result, accessible foundation areas and proposed vent route before a mitigation scope is selected. Request a visitTalk through your next step → Real Air Sense installation photography. 01 Understand the result02 Discuss the property03 Plan the next step Is Missouri a high radon state? Missouri DHSS reports radon in every county. That includes Jefferson County, but a state description does not establish the concentration in an Arnold or Festus home. Use the actual property’s test report to decide what to investigate. If you have no report, begin with measurement. If you already have a result, send the complete document so its location, dates and test method can be reviewed. County-level evidence is background information, not a diagnosis for an individual address. What Jefferson County homes are most likely to have radon? Appearance and house age cannot reliably identify which property will test high. A crawl space or combination foundation is a detail to assess, not a reason to assume a particular result. The same is true of a ranch or split-level design. Walk through the lowest level and note where additions meet the original house. An enclosed porch, expanded bedroom or attached space may have a different foundation beneath it. Explain those transitions even when the finished rooms make the house appear continuous. Identify the original foundation. Mark additions and crawl spaces. Share every available test report. How is radon mitigated in a split-level or combination foundation? The design needs to address the relevant foundation sections. A proposal should explain how the basement, separate slabs and any crawl space will be considered together. Do not assume a collection point serving one portion also serves every addition. For a Jefferson County house with limited crawl access, tell the provider about the opening and clearance. Photos and a simple sketch can help prepare for the visit. Avoid entering a difficult crawl space just to gather estimate photos. Show each floor elevation. Identify crawl-space access. Ask how the whole layout is assessed. Agree on post-installation verification. What does radon mitigation cost in Jefferson County? Air Sense publishes $1,100 to $3,200 for a standard active sub-slab system. A crawl-space membrane or mixed-foundation project requires an address-specific scope. Do not treat the standard range as a ceiling for work that has not been inspected. Ask what the estimate includes and whether access preparation is needed. The written proposal should distinguish installation, electrical arrangements, testing and any restoration work. Communities we serve Air Sense Environmental handles inquiries for Jefferson County and nearby south St. Louis County. Provide the address to confirm the visit and scope, particularly for Hillsboro or De Soto. These community references do not represent branch offices. Arnold, Imperial and Barnhart Festus and Crystal City Hillsboro and De Soto Oakville and Mehlville in south St. Louis County What Air Sense customers say Excerpts from Google reviews of Air Sense Environmental, quoted as written. Reviewer names are withheld; each link opens the full review on Google. These customers are from across the St. Louis area, not only this county. “We had another bid previously from a different company who told us our home would be difficult, and he really did not want to discuss solutions to making a system look nice. Jake was reassuring from the beginning.” Google review, February 2026 · Read the full review on Google “Jake was super professional and was able to make a difficult install look very easy!” Google review, June 2025 · Read the full review on Google “As soon as he arrived, he quickly assessed the best place to put the radon pipe (extra bonus, it is hidden from the street)” Google review, May 2025 · Read the full review on Google See all 167 Google reviews of Air Sense Environmental (rated 5.0 as of October 10, 2026) Questions before you book Does a crawl space need a different approach from a slab?It may. Show the contractor the entire layout and ask whether a membrane and separate collection arrangement should be evaluated. Do you offer well-water radon treatment?This site covers indoor-air radon questions. Do not assume a quote for an air system includes testing or treatment of well water. What should I do before an estimate?Gather the test report, make a simple foundation sketch and photograph accessible equipment. Include the address and any timing requirements. Sources and further reading Missouri DHSS: radon and county testing dataAir Sense Environmental: service information In this guide Keep reading Radon Testing in Jefferson County, MissouriCrawl Space Radon MitigationA real property. A specific plan. Bring your test report and property questions to Air Sense Environmental. Discuss your property → Your next step Make a plan for your property. Ask Air Sense Environmental about testing, system options or an existing radon concern. Request a visit → JeffCo RadonThis site is operated by Air Sense Environmental, which provides the radon services described here. It is a service information site, not a separate local office. 5237 Old Alton Edwardsville Rd, Edwardsville, IL 62025 314-664-9807 Start here HomeAboutContact Radon decisions depend on a property-specific test and the applicable guidance. --- --- # Navigation - [Documentation Overview](https://jeffcoradon.com/llms.txt): Return to the main documentation index ## Identity and source records - [Air Sense Environmental](https://airsenseenvironmental.com/) - [Jake Lusby profile](https://airsenseenvironmental.com/author/jakelusby/) - [IEMA issuer record](https://public.iema.state.il.us/Radon/Home/LicenseIndex?Employer=Air%20Sense%20Environmental&LicenseTypeID=0&CountyID=0&SearchString=&PageSize=20) - [Website entity map](https://jeffcoradon.com/entitymap.json) - [About this website](https://jeffcoradon.com/about/) - [Contact](https://jeffcoradon.com/contact/) Follow-up radon testing is recommended after mitigation. Confirm the provider, price, timing and scope in the written estimate; it is not automatically included. No blanket free-adjustment or performance guarantee is stated here.