Off-Grid Living in Calvert County, Maryland

I've been digging through Calvert County, Maryland's official pages to figure out what off-grid living actually looks like here, and the honest answer is: it's more regulated than you might hope, and a few pieces just aren't spelled out publicly yet.

Zoning. Unlike some Maryland counties that skip countywide zoning, Calvert has adopted one, administered by the Department of Planning & Zoning under authority granted by Maryland law. The current ordinance dates to 2006, and the county is mid-way through a comprehensive update, so some of what I describe here could shift. If your land sits near one of the incorporated town centers, there may be an overlay ordinance layered on top of the county code, and I couldn't fully untangle those overlaps from public documents, so check with Planning & Zoning directly for your parcel.

Dwellings, tiny homes, RVs. This is the biggest gap in my research. I found plenty of commercial blog posts claiming specific rules about tiny houses or RV occupancy in Calvert County, but nothing on an official county page confirming those claims, so I'm not including them. The county's zoning ordinance and building code almost certainly govern minimum dwelling size and RV occupancy in some way, it's just not documented publicly in a way I can cite. Ask Planning & Zoning before you buy a tiny home or plan to live in an RV full-time here.

Building permits. The Board of County Commissioners adopted the 2018 International Building Code and 2018 International Residential Code as the county's building code, and the Division of Inspections and Permits enforces it alongside electrical and plumbing codes. There's also a county Minimum Livability Code (Chapter 75) covering habitability. Expect a permit process for most construction.

Septic and composting toilets. The Calvert County Health Department's Environmental Health Division issues septic (on-site sewage disposal) permits, working under Maryland Department of the Environment oversight. Alternative systems exist for tough soil conditions but need third-party engineering review. I found no official confirmation that a composting toilet can substitute for a permitted septic system here, so don't assume it.

Greywater and rainwater. No Calvert-specific rules turned up in my research for either. That means Maryland's state greywater law (limited to shower, tub, and bathroom sink reuse) is likely the controlling rule, and rainwater harvesting appears to be permitted with no added county restriction.

Wells. The Health Department's Environmental Health Division also permits and tests private wells, and reviews well/septic adequacy as part of the building permit process.

Full grid disconnection. I found no dedicated Calvert County rule addressing living entirely off-grid, no power or water hookups. It falls into the gap between zoning, building code, and health department permitting, none of which spell it out directly.

Bottom line: Calvert County is workable for off-grid ambitions, but plan on real permitting for septic, wells, and building, and call the county before assuming anything about tiny homes or RVs.