The New Jersey Highlands Water Protection and Planning Act is one of the biggest factors shaping what you can and can't do with land in Sussex, Warren, Morris, and parts of Passaic County — and most buyers and sellers don't fully understand it until it's already affecting their deal. Here's what it is and how it breaks down.
What the Highlands Act Covers
Passed in 2004, the Highlands Act protects the water supply watershed that serves a large share of New Jersey's population. It divides the covered region into a Preservation Area, which is subject to strict state-level development review, and a Planning Area, which is guided by regional planning goals but generally leaves more development authority with the local municipality.
Preservation Area vs. Planning Area
Land in the Preservation Area faces the tightest restrictions — septic density limits, water and wastewater capacity rules, and mandatory review under the Highlands Regional Master Plan can significantly limit subdivision and new construction. The Planning Area is more flexible, but municipalities are still expected to align local zoning with Highlands regional goals, so restrictions can still apply even outside the Preservation boundary.
Why It Matters Before You Make an Offer
A parcel's Highlands designation directly affects buildability, subdivision potential, and long-term value — two adjoining lots can carry very different development rights depending on which side of the Preservation/Planning line they fall on. Buyers evaluating raw land for future construction need to check this before assuming a lot can be built on or split, and sellers need to understand how it affects their pricing and buyer pool.
How to Check Where Your Parcel Falls
The NJ Highlands Council maintains mapping tools that show exactly which Highlands designation applies to a given parcel, and municipal planning or zoning offices can confirm local overlay requirements on top of the state designation. Pulling this information early — before listing or making an offer — prevents surprises during due diligence and lets both sides negotiate with accurate information about what the land can actually support.
Selling Highlands-Affected Land the Right Way
Land inside the Highlands region isn't unsellable — it's simply a different kind of sale that needs to be marketed to the right buyer, whether that's someone seeking recreational or conservation-minded acreage rather than a developer. Framing the listing accurately, with the Highlands designation disclosed upfront, keeps the deal from unraveling mid-contract when a buyer's attorney or engineer flags restrictions that should have been addressed from the start.