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

Alexandria Township, Alexandria Township

Sealing, sump covers and slab-crack closure in Alexandria Township

Gasketed sump lids, sealed floor-wall joints, and closed slab penetrations. Rarely enough alone — but it makes the system that follows work properly.

Whether sealing, sump covers and slab-crack closure is the right answer in Alexandria Township depends on what is actually under the floor.

How this normally comes up

  • A visible gap where the slab meets the foundation wall
  • An open sump pit sitting in a finished basement
  • A crawl-space hatch that soil gas moves straight through

Why this comes up in Alexandria Township

Very little of Alexandria sits inside a public supply area. A well here draws from the rock at the western margin of the Newark Basin — the same rock under the slab.

Alexandria Township — the state's own numbers

38% of the 672 test results NJDEP holds for Alexandria Township were at or above the 4.0 pCi/L action level — 258 of them. That puts it in Tier 1 — high potential.

Alexandria Township is a large rural township in western Hunterdon, running from the Musconetcong ridge down toward the Delaware valley, and that shapes what a system here has to be designed around.

Practicalities in Alexandria Township

Large lots with ample room around the house on most properties.

Construction permits go through Alexandria Township, and installing radon mitigation for a fee anywhere in New Jersey requires NJDEP certification.

What the work involves

Sealing on its own rarely brings a house below the action level and should not be sold as though it will. What it does is make an active system work harder for its money by cutting the leakage paths that otherwise short-circuit the suction — so it is nearly always done as part of an install rather than instead of one.

Typical cost in Hunterdon County, NJ

$400 – $1,300 — typical range, not a quote. What your building needs can only be settled by a certified business that measures it on site.

The right answer depends on your specific building, which is why somebody has to measure it.

Certification, checked before referral

Installing radon mitigation for a fee in New Jersey requires NJDEP certification as a radon mitigation business, affiliated with a certified radon mitigation specialist (N.J.A.C. 7:28-27). We confirm that on the NJDEP register and record the date we checked. That is a check, not an endorsement — satisfy yourself before you hire.

Want a quote before the closing date?

One description is enough. We'll send it to certified local crews and leave the decision entirely with you.

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Related

Other things that come up here

Other work in Alexandria Township

Same ground, different question.

Sealing, sump covers and slab-crack closure nearby

Neighbouring towns on the same ground.