Cincinnati January Radon Action Month: the homeowner checklist

What Radon Action Month is

EPA designated January as National Radon Action Month in the late 1990s, timed to heating-season radon equilibrium (when readings are at their seasonal high in Cincinnati and other northern-tier cities) for maximum-information testing. The Ohio Department of Health joined the program early and has run a Cincinnati-area kit-distribution campaign nearly every January since.

The Cincinnati-area program in recent years has worked like this. ODH allocates a set number of free or subsidized short-term test kits to each county health department. Those county departments distribute the kits through walk-in pickup, mail-order request, or partner libraries during the January 1 to January 31 window. Hamilton County Public Health typically distributes through their main office and several branch locations. Butler, Warren, and Clermont county health departments have similar pickup networks. Northern Kentucky Health Department coordinates a parallel program for Boone, Kenton, and Campbell counties on the KY side.

The 2027 round checklist (December 2026 prep)

If you want to take advantage of the 2027 Radon Action Month round, the prep work starts in mid-December 2026.

1. Find your county's pickup window. ODH announces the kit distribution dates in mid-December each year. Hamilton County Public Health, Butler County General Health, Warren County Health District, and Clermont County Public Health publish to their respective sites. Check around December 15-20 for current-year dates.

2. Decide whether you want a free kit or a professional test. The free hardware-store-style charcoal canister kit is appropriate for screening-level information. If you are buying or selling a home, you need a professional continuous radon monitor (CRM) test under ANSI/AARST MAH-2023 closed-house conditions; the free kit does not meet lender requirements for real-estate transactions.

3. Plan the test location. Place the kit in the lowest livable level of the home, 20+ inches off the floor, in a position not affected by drafts, exterior doors, or sources of heat. Closed-house conditions: windows and exterior doors closed for 12 hours before the test starts and during the test period; HVAC running on normal mode.

4. Pick a 48 to 72-hour window during heating season. Mid-January through late February is ideal. The kit measures radon over the deployment window; longer windows produce more-averaged results. Most charcoal-canister kits are designed for 48 to 96-hour deployments.

5. Mail the kit back per instructions. Most ODH-distributed kits include a pre-paid mailing envelope to the analyzing lab. Results return by mail in 5-7 business days.

What to do with the result

Three result tiers.

Below 2.0 pCi/L. Below EPA's "consider mitigation" threshold. Continue testing every 2 years per EPA cadence. No action needed.

2.0 to 4.0 pCi/L. EPA "consider mitigation" range. Household-specific factors matter: children sleeping in lower levels, smokers in the home, basement workshop hours. If any of those apply, mitigation is the right move. If not, you can defer with annual monitoring.

Above 4.0 pCi/L. EPA action level exceeded. Mitigate.

For households in the 2.0-4.0 range that want a more-defensible answer before committing to mitigation, the right next step is a long-term test (90-day alpha-track) that integrates over winter and produces a true annual-average reading. Cost: $30-$50 at any hardware store.

Cincinnati neighborhood patterns to expect

Based on pre-mitigation results reported to the Ohio Department of Health by licensed testers since 2010.

Older east side neighborhoods: Hyde Park and Mt. Lookout (45208) show a median of 1.9 pCi/L with about 14 percent of tests above the EPA action level; Norwood (45212) and Walnut Hills (45206) run about 11 and 9 percent.

Suburbs east and northeast of the city: Madeira and Indian Hill (45243) run about 24 percent above 4.0, Blue Ash and Montgomery (45242) about 27 percent, and eastern Anderson Township (45244) about 31 percent.

Butler and Warren County suburbs: Mason (45040) runs about 34 percent and West Chester Township (45069) about 36 percent. Some newer homes there have a passive radon stack from construction; activation (adding a fan) is the typical fix when one is present.

Northern Kentucky housing in Cold Spring, Fort Thomas, Florence: Kentucky publishes no comparable ZIP-level results, and EPA maps Boone, Kenton, and Campbell counties as Zone 2. A test is the only guide. See our radon levels by ZIP code table for every local ZIP.

What credentialed mitigation costs in Cincinnati (current as of 2026)

For homes that test above 4.0 pCi/L and need active mitigation:

| Foundation type | Typical cost | |---|---| | Slab on grade | $1,200 to $1,800 | | Full basement (concrete) | $1,500 to $2,400 | | Full basement (stone, pre-1950) | $1,800 to $2,800 (more sealing scope) | | Crawl space (sub-membrane depressurization) | $1,800 to $3,500 | | Multi-zone (two suction points) | $2,800 to $4,200 |

Pricing has been stable across Greater Cincinnati for 3-4 years. Quotes from credentialed mitigators rarely vary more than 10-15 percent on the same scope.

What we do during Radon Action Month

We run a few extra services during the January-March window when test kits surface above-action-level readings.

• Same-day phone consultations for any positive result from an ODH-distributed kit (we are usually backed up with calls in mid-January).
• Free in-home assessments for any home that tests above 4.0 pCi/L; on-site visit produces a written fixed-price quote good for 30 days.
• Real-estate-driven priority scheduling for any home under contract with a closing date in the next 30 days.

Free phone consultations include a 10-minute scope triage and a price range. If your January 2027 result lands above the action level, call our dispatch directly.