Maryland's Forest Conservation Act: The Site-Design Rule That Reshapes Projects

What FCA requires and when

FCA applies when a project files for a subdivision, grading permit, or sediment control permit on a parcel of 40,000 sf (~1 acre) or more. Local jurisdictions can set lower thresholds (Baltimore City triggers at 5,000 sf of disturbance).

Compliance involves two principal deliverables:

• Forest Stand Delineation (FSD) — inventory and assessment of existing forest cover and sensitive environmental features.
• Forest Conservation Plan (FCP) — strategy for retaining, protecting, and reforesting on-site with long-term protection mechanisms.

Administered by the Maryland Forest Service (dnr.maryland.gov) and implemented at the local level by counties and municipalities with approved programs.

Forest Stand Delineation (FSD)

The FSD documents what's on the site:

• Forest stand locations and composition.
• Specimen trees — trees 30 inches or more in diameter at breast height (DBH) or 75% of the state champion for the species.
• Sensitive areas — steep slopes, hydric or erodible soils, critical habitat, streams, floodplains.
• Site vicinity and environmental features maps.

Three FSD levels — simplified, intermediate, full — scale to proposed disturbance extent. Prepared by a Maryland-licensed forester, Maryland-licensed landscape architect, or other DNR-approved qualified professional.

Forest Conservation Plan (FCP)

Translates the FSD into strategy:

• Areas to be retained.
• Areas to be cleared (with justification against priority criteria).
• Reforestation / afforestation locations.
• Long-term protection mechanisms — conservation easements, deed restrictions, covenants.
• Calculations of forest cleared, retained, replanted.
• Long-term maintenance plan (typically 2+ years).

Conservation thresholds

FCA sets minimum percentages of forest cover to maintain at project completion based on land-use category:

• Agricultural and Resource Areas — 50% threshold.
• Medium-Density Residential — 25% threshold.
• Commercial and Industrial Areas — 15% threshold.
• Other land-use categories have their own thresholds.

Local programs can adopt stricter thresholds. Montgomery County in particular has raised thresholds for several zoning designations.

Priority retention areas

FCA requires directing development impacts away from priority areas:

• Forests adjacent to streams, wetlands, and water body buffers.
• Forest on steep slopes or highly erodible soils.
• Large contiguous forest blocks / wildlife corridors.
• Critical habitat for endangered or threatened species.
• Specimen and champion trees.
• Priority urban forests — added in 2024 amendments.

These aren't just preferences — FSD identifies them, FCP justifies any clearing, and review reviewers will push back on unnecessary priority-area clearing.

Mitigation — when clearing is unavoidable

The mitigation hierarchy:

1. Enhance existing forest on-site through selective clearing or supplemental planting.
2. On-site afforestation or reforestation.
3. Off-site afforestation or reforestation within the same watershed or via forest mitigation bank.
4. Fee-in-lieu into the local forest conservation fund (if on-site and off-site planting isn't feasible).

Reforestation ratios:

• Above the threshold — 1/4 acre planted per 1 acre cleared.
• Below the threshold — 2 acres planted per 1 acre cleared.

Crossing the threshold during development is costly. Keeping retention above threshold by site-plan design is the lower-cost approach.

Local variation — the three big counties

Montgomery County

Adopted its own Forest Conservation Law in 1992 under the Montgomery Planning Department. Key features:

• Can be more stringent than state FCA.
• Aims for "no net loss of forest."
• Recent updates raised conservation and afforestation thresholds for several zoning designations.
• Increased reforestation ratios, especially for impacts in floodplains and stream buffers.
• Binding 5-year maintenance agreement for all plantings.

Baltimore County

Adopted local Forest Conservation Regulations in 1993 (Baltimore County Code 33-6):

• Applies to development activities on parcels 40,000 sf or greater.
• Requires FSD, Forest Conservation Worksheet, FCP.
• Emphasis on Forest Conservation Easements for long-term protection.
• Regulates forest buffers for streams, wetlands, and floodplains.
• Administered through DEPS. See our Baltimore County Permits essay.

Howard County

Adopted 1992, with significant updates in 2019 and 2020 (CB62-2019):

• Quadrupled replanting requirements for forest cleared above threshold.
• Residential developments must meet 75% of forest conservation obligations on-site.
• Increased fees-in-lieu.
• Green Infrastructure Network added as priority for retention and reforestation.
• Administered through Department of Planning and Zoning and Department of Recreation and Parks.

How FCA interacts with other MD regulations

• ESD-to-MEP stormwater — FCA retention pairs naturally with MD's stormwater Environmental Site Design philosophy. Retained forest acts as natural stormwater BMP. See our MD ESD essay.
• Critical Area Commission — Chesapeake Bay Critical Area regulations add another buffer layer on top.
• Local stormwater — Chapter 124.1 or equivalent local ordinances interact.
• Zoning and SLDO — site layout must satisfy both zoning and FCA retention simultaneously.
• Building permit under MBPS (see our MD MBPS essay) comes downstream of FCA compliance.

Common developer missteps

• Starting building design before FSD. Building placement should respond to priority retention areas, not force them into mitigation.
• Underestimating specimen tree protections. 30-inch DBH trees aren't "remove and plant two 2-inch caliper replacements" — they're priority-retention targets.
• Crossing the threshold unintentionally. 2:1 replanting ratios below threshold can turn a marginal project into an infeasible one.
• Ignoring local variation. Montgomery, Baltimore, and Howard county versions go beyond state minimum.
• Not engaging a licensed forester early. FSD quality affects FCP quality affects review outcome.
• Missing maintenance agreement requirements. 5-year binding maintenance in Montgomery; multi-year elsewhere.

What MD FCA means for cross-state contractors

MD's FCA has no direct analog in DE, PA, NJ, or VA. Those states have tree ordinances at local levels and various stream buffer protections, but not statewide forest stand delineation + forest conservation plan + reforestation ratio framework. Contractors and developers coming into MD from those markets need to internalize:

• FCA applies at project intake — it's not a late-stage layer.
• Forest inventory is a deliverable.
• Site plan must reflect forest retention calculations.
• Mitigation costs can exceed expectations if clearing crosses threshold.
• Local variation is real — which county matters.

What to do with this

If you're acquiring MD land: FCA analysis during due diligence. Understand current forest cover, priority areas, achievable development yield under retention thresholds.

If you're designing: engage a Maryland-licensed forester early. FSD informs site layout.

If you're in Montgomery, Baltimore County, or Howard County: read the local ordinance version, not just state FCA.

If you're budgeting: include reforestation cost and multi-year maintenance as line items, not contingencies.

For the broader MD regulatory stack, see our MD ESD essay, MBPS essay, and Baltimore County Permits essay.

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