Hunterdon County · 25 of 26 towns NJDEP Tier 1 Action level 4.0 pCi/L Free for homeowners — paid by the crews

Guides

Radon, explained for Hunterdon County

Straight answers about testing, mitigation, well water and what New Jersey actually requires — written for the ground under Hunterdon County rather than for the country in general.

Local geology

Why Hunterdon County Has Some of the Highest Radon Readings in the Country

The Reading Prong, the Newark Basin, and the Lockatong argillite — why 25 of Hunterdon County's 26 municipalities are classified Tier 1 for radon, what the state's own numbers say town by town, and what it means street by street.

August 4, 2026
7 min

Costs

What Radon Mitigation Costs in Hunterdon County

Typical price ranges for radon systems in Hunterdon County homes — and the four things that actually decide whether you land at the bottom or the top of the range.

July 30, 2026
6 min

Testing

Your Radon Test Came Back High. Here's What Actually Happens Next.

What 4.0 pCi/L means, why the number between 2 and 4 is the awkward one, and the order the next steps actually go in.

July 24, 2026
5 min

Buying and selling

Radon and a Home Sale in New Jersey: Who Pays, and How Long It Takes

What New Jersey actually requires at closing, why the 48-hour test becomes a negotiation, and how to keep a radon finding from stalling a deal.

July 17, 2026
6 min

Wells and water

Radon in Well Water: The Half of the Problem an Air System Won't Fix

Why a Hunterdon County home on a private well can have two radon sources at once, how gross alpha testing surfaces it, and what treatment actually costs.

July 11, 2026
6 min

Systems

How to Tell If Your Radon System Is Actually Working

The manometer, the fan, the discharge point and the re-test — a five-minute check anyone can do on an existing radon mitigation system.

July 5, 2026
5 min

Older houses

Radon in an Old Stone Farmhouse: Why the Standard System Doesn't Apply

Open cellars, rubble stone walls and additions on separate footings — what mitigating a pre-1900 Hunterdon County house actually involves.

June 27, 2026
6 min

Testing

Short-Term vs Long-Term Radon Tests: Which One Do You Actually Need?

48 hours or 90 days — what each test tells you, what invalidates a result, and why the answer depends entirely on whether there is a closing date involved.

June 20, 2026
5 min

New construction

Building in Hunterdon? The Radon Hazard Subcode Already Applies to You

New Jersey requires radon-resistant construction in Tier 1 municipalities — which is 25 of Hunterdon County's 26. What the code asks for, and why activating a passive stack later is cheap.

June 12, 2026
5 min