Crawl space sub-membrane depressurization in Milford
Sealed membrane over an open crawl-space floor with suction drawn beneath it. The right system when there is no slab to cut through.
Milford Borough
Diabase uplands and the Delaware corridor. Free referrals to NJDEP-certified radon businesses covering Milford.
Milford sits in Milford Borough — a small borough on the Delaware at the mouth of the Hakihokake, in the far west of the county.
Housing stock. A compact old mill village of 19th century houses on modest lots, with limited later building.
Water supply. The village has a borough supply, and the ground around it does not always. A well here draws from the basin-margin rock beneath Milford.
Milford is a small Delaware mill village at the western edge of the Newark Basin, close to where the basin sediments meet the older rock to the north. Its housing is largely 19th century — shallow cellars, stone foundations, floors added later — which puts sealing and, on the more open cellars, membrane work at the centre of most jobs. Being at the basin margin also means the depth of soil over rock is inconsistent across the village and the ground immediately around it, and that variability is precisely what decides how far a single suction point can reach.
None of that describes a particular property. Formations cross municipal boundaries freely, so where a specific address falls is a question for the NJ Geological Survey's bedrock mapping, and what it means under the floor is a question for a diagnostic test.
Around Milford. The requests come from the Bridge Street and Church Street village centre; the Delaware River frontage and the old mill sites; the Hakihokake Creek valley; the higher lots on the Holland Township side.
Modest village lots with usable side access on many properties.
Village installs are small jobs that take longer than their size suggests, because old foundations do not seal quickly and pipe routes through 19th century houses are rarely direct. Properties on the surrounding higher ground are generally more straightforward.
Milford sits right at the western margin of the Newark Basin, where depth to rock changes over very short distances — the reason two neighbouring village houses can respond quite differently to the same system design.
As an old Delaware mill village, shallow 19th century cellars are a common find here, which makes sealing a larger share of the work than it is in the newer parts of the county.
Permits run through the Milford Borough construction office. Properties just outside the borough are on private wells drawing from fractured rock, so the water-side question belongs in any assessment there.
Worth checking rather than assuming: mailing addresses here often cross municipal lines, and some towns share construction-code services, so the office that issues your permit may not be the one on your envelope.
What NJDEP has actually measured in Milford Borough
| Test results in NJDEP's dataset | 1,210 |
|---|---|
| At or above 4.0 pCi/L | 505 |
| Share at or above the action level | 42% |
| NJDEP tier | Tier 1 — high potential |
Tier 1 means at least 25 homes tested with 25 percent or more at or above 4 pCi/L.
Source: New Jersey Department of Environmental Protection, Radon Section, 2015 Radon Tier Assignment Report (May 2015). NJDEP's figure is a cumulative count of test results in its dataset, not a count of distinct homes. These are municipality-wide totals and say nothing about any individual property — only a test does that.
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Chosen for how these buildings are built and what they sit on.
Sealed membrane over an open crawl-space floor with suction drawn beneath it. The right system when there is no slab to cut through.
Suction drawn from inside a hollow block wall, with the top course sealed. The piece a slab-only system misses on block foundations.
Point-of-entry aeration for private wells carrying radon into the house through the plumbing. The half of the problem an air system can't reach.
A 48-hour closed-house test at the lowest lived-in level, placed and read by a New Jersey certified measurement business. The number everything else follows from.
Nearby
Sourland-type diabase and the dark argillite of the Lockatong Formation. Stone farmhouses, open crawl spaces, and river-town cellars cut into rock.
Less common in Milford, but available.