Capitol Planning Region, CT: EPA's radon zone, explained

Capitol Planning Region falls outside what EPA's 1993 radon zone map can rate directly, because its boundaries were redrawn after the map was made — the coverage gaps guide explains exactly which counties this affects and why.

Where Capitol Planning Region sits nationally

Capitol Planning Region, Connecticut is home to about 991,508 people across 1,027.354 square miles. Averaged across its land area, Capitol Planning Region runs about 965 people per square mile.

What this actually means for a house in Capitol Planning Region

Without a zone rating for Capitol 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.

Testing and mitigation in Capitol Planning Region

For a Capitol Planning Region homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find Connecticut's state radon program

For Capitol Planning Region, an ongoing number beats a one-time test - a Airthings radon monitor tracks Capitol Planning Region's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

Where Capitol Planning Region's figures come from

Capitol Planning Region's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The coverage gaps guide covers every county EPA's map can't rate directly and why.