The Critical Area runs 1,000 feet inland
Maryland enacted the Chesapeake Bay Critical Area Protection Program in 1984; it now sits at Natural Resources Article § 8-1801 and following. It reaches all land within 1,000 feet of the mean high water line of tidal waters or the landward edge of tidal wetlands. Local jurisdictions map every acre into one of three classifications under COMAR 27.01.02 — Intensely Developed Area, Limited Development Area, or Resource Conservation Area. Resource Conservation Area ground is capped at one dwelling unit per twenty acres, so acreage alone does not tell you how many lots the land will yield. A minimum 100-foot vegetated Buffer has been required since 1986, widened to 200 feet for new subdivisions and site plans in the RCA.