Off-grid site report

Frederick County, MD

39.3796, -77.2781 · 509 ft elevation

Read this before you act on anything below. This is my researched starting point for Frederick 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 rulesFrederick County, MD

Zoning & raw-land occupancy

RestrictedFrederick County has countywide zoning enforced by the Zoning Administration under the County Zoning Ordinance; agricultural parcels have development-rights limits tied to a 1976 cutoff date. Rules differ entirely inside incorporated towns, which have their own zoning codes. source

Dwellings, tiny homes & RVs

RestrictedThe county has a defined ADU policy with strict, non-variable size standards, but whether an RV or tiny home on wheels can serve as a full-time standalone residence outside that framework is not confirmed by official sources. source

Building permits & codes

RestrictedThe county enforces updated Building, Plumbing, Electrical, and state Fire codes through its Office of Permitting and Inspections; all new construction needs a permit. source

Septic & composting toilets

RestrictedSeptic systems are permitted and inspected by the county Health Department's Well & Septic Branch under Maryland's COMAR Chapter 26, with defined setbacks from wells and property features. Composting toilets fall under a state MDE discharge permit process unless tied into an approved subsurface system. source

Greywater reuse

RestrictedNo county-specific greywater ordinance was found; greywater appears to rely on Maryland's state baseline rules, and county-specific standards beyond that are not confirmed. source

Rainwater harvesting

Generally allowedNo county restriction on rainwater harvesting was found; this appears to inherit Maryland's state stormwater-design allowance without added county rules, though that's not fully confirmed.

Private wells & water rights

RestrictedPrivate wells are permitted and inspected by the county Health Department's Well & Septic Branch, with a required 30-foot setback from dwellings; domestic use is exempt from the state's Water Appropriation and Use Permit. source

Living disconnected from utilities

Unclear - verifyNo dedicated county ordinance addresses full grid disconnection; occupancy approval appears tied to septic/well sign-off and the county's Adequate Public Facilities Ordinance in some areas, but whether a fully self-sufficient home can get occupancy is not confirmed. source

Open the full county page with sources →

Sun30-year normals

Peak-sun hours, annual average: 4.9 hrs/day
Worst month (sizes an off-grid array): 3.7 hrs/day
Yearly output per 1 kW of panels: 1,399 kWh

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Weather1991-2020

Precipitation: 42 in/yr
Heating degree days: 5,115 (moderate)
Frost-free season: Apr 27 to Oct 14

How far help isstraight-line

Hospital Medstar Montgomery Medical Center: 19.7 mi
Fire station Hayattstown Fire Station 09: 7.1 mi
Hardware store Ace Hardware: 6.0 mi
Grocery Weis: 3.9 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 21774).

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.