Radon in Holland Township

Holland Township sits in Holland Township — a rural township on the Delaware in the northwest corner of the county, opposite Riegelsville.

Housing stock. Farmsteads and river-road houses of 19th century date, with post-1970s single-family building on large lots inland.

Water supply. Holland sits almost wholly outside public supply. A well here draws from the rock along the Newark Basin–Musconetcong transition, which changes character across the township.

The ground under Holland Township

Holland Township runs along the Delaware in the northwest corner of Hunterdon, taking in ground where the Newark Basin sediments give way northward toward the older rock along the Musconetcong. That transition is the practical point: depth to rock and the character of the fill under a slab vary considerably from the river road to the inland farmland, and that variable decides how far suction travels. The housing splits between 19th century farm and river properties on stone foundations — where membrane systems and heavy sealing are common — and modern large-lot houses with poured basements that install conventionally. Wells are effectively universal.

Bedrock boundaries run through municipalities rather than around them, so the description above is the shape of the ground, not a statement about a particular lot. The New Jersey Geological Survey's bedrock mapping is the authority on which formation sits under a specific address.

Around Holland Township. The requests come from the Riegelsville and Milford ends of the river road; the Route 519 corridor; the Musconetcong valley on the northern boundary; the Hakihokake and Harihokake creek valleys; the inland farmland toward Alexandria Township.

Working here

Large rural lots with room to work, though river-road properties can be tight against the road and the bank.

What moves the cost here

There is no single Holland Township price. Modern houses on open lots install at the ordinary end; 19th century river-road and farm properties need membrane work, sealing, and sometimes more than one suction point. The well-water question adds a separate system where it applies.

Holland Township spans the transition from Newark Basin sediments to the older rock along the Musconetcong, so depth to bedrock — and therefore how a system has to be designed — changes noticeably between the river road and the inland farmland.

Its 19th century river-road houses sit tight against the road and the riverbank, leaving unusually little room for exterior pipe routing on properties that otherwise look rural and open.

Permits and paperwork

Permits go through the Holland Township construction office. For the many addresses here outside a public supply, the gross alpha screening required on Hunterdon County wells at the point of sale is often the first indication of a water-side radon problem.

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.