Is Southeastern Connecticut Planning Region, CT a radon risk area?

EPA's Map of Radon Zones does not carry a rating for Southeastern Connecticut Planning Region under its current boundaries — the map dates to 1993 and this county's borders have changed since (see the coverage gaps guide).

Southeastern Connecticut Planning Region by the numbers

About 282,602 people live in Southeastern Connecticut Planning Region, Connecticut, spread over 598.139 square miles. Averaged across its land area, Southeastern Connecticut Planning Region runs about 472 people per square mile.

Zone vs. an actual test

Without a zone rating for Southeastern Connecticut Planning Region to compare, the two national reference points still apply: EPA's action level is 4 pCi/L, against a national indoor average around 1.3 pCi/L and outdoor air near 0.4 pCi/L. EPA's guidance is unchanged by the absence of a zone rating here: test every home, since a zone (where one exists) only describes a county-wide average, never an individual house.

Next steps for a home in Southeastern Connecticut Planning Region

Nothing about Southeastern Connecticut Planning Region's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Connecticut's state radon program

Southeastern Connecticut Planning Region's test kit answers today; a Airthings radon monitor keeps answering for Southeastern Connecticut Planning Region over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

More on how this number was built

Southeastern Connecticut Planning Region's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. See the coverage gaps guide for the full list of boundary changes EPA's map predates.