Off-grid site report

Calvert County, MD

38.7053, -76.5323 · 10 ft elevation

Read this before you act on anything below. This is my researched starting point for Calvert County, MD, not legal advice and not a guarantee. Rules change, and the deciding facts on any specific parcel (setbacks, perc results, overlay districts, deed restrictions, road frontage) live at the county or town office, not in any database. Before you buy land or build, confirm the current rules directly with the local zoning and health offices - the sources on this page tell you exactly who to call.

The local rulesCalvert County, MD

Zoning & raw-land occupancy

Varies locallyCalvert County has adopted its own countywide Zoning Ordinance (2006, currently under revision) administered by the Department of Planning & Zoning; some town centers may have overlay rules that alter this locally. source

Dwellings, tiny homes & RVs

Unclear - verifyNo official Calvert County page confirms specific rules for tiny homes or RV occupancy; only unofficial commercial sources make such claims. Confirm directly with Planning & Zoning. source

Building permits & codes

RestrictedThe county adopted the 2018 International Building Code and International Residential Code, enforced by the Division of Inspections and Permits, plus a separate county Minimum Livability Code. source

Septic & composting toilets

RestrictedThe Calvert County Health Department's Environmental Health Division permits septic systems under Maryland Department of the Environment oversight; composting toilets are not confirmed as an accepted substitute. source

Greywater reuse

Unclear - verifyNo Calvert County-specific greywater rule was found; the state's greywater law (limited to shower/tub/bathroom sink reuse) likely applies by default. Not confirmed at the county level.

Rainwater harvesting

Generally allowedNo county ordinance restricting rainwater harvesting was found, so the state's generally permissive stance appears to apply in Calvert County too.

Private wells & water rights

RestrictedThe Health Department's Environmental Health Division permits, tests, and certifies private wells, and reviews well adequacy during building permit review. source

Living disconnected from utilities

Unclear - verifyNo dedicated Calvert County rule on full grid disconnection was found; it falls between zoning, building code, and health department permitting without a single clear answer.

Open the full county page with sources →

Sun30-year normals

Peak-sun hours, annual average: 4.8 hrs/day
Worst month (sizes an off-grid array): 3.1 hrs/day
Yearly output per 1 kW of panels: 1,378 kWh

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Weather1991-2020

Precipitation: 44 in/yr
Snowfall: 14 in/yr
Heating degree days: 4,316 (moderate)
Frost-free season: Apr 10 to Nov 1

How far help isstraight-line

Hospital Anne Arundel Medical Center: 19.7 mi
Fire station Deale Volunteer Fire Department: 5.3 mi
Hardware store Sneade's Ace Home Center: 2.2 mi
Grocery Harris Teeter: 6.9 mi

From OpenStreetMap. Road miles will be longer, often much longer in hill country.

Plan this spot

These open with this location's real numbers already filled in (ZIP 20714).

Size a solar system Heat loss & insulation Firewood per winter Rainwater harvest Garden size Panel tilt

Sources: US Census Bureau geocoder; NLR PVWatts v8 (solar); NOAA NCEI 1991-2020 climate normals (nearest station) or Open-Meteo (ZIP-centroid) for weather; Open-Elevation; OpenStreetMap contributors. Public data retrieved Aug 22, 2026; agencies update their layers on their own schedules. Planning data, not a survey or legal advice.