Off-Grid Living in St. Louis city, Missouri

I'll be straight with you: St. Louis City is about the least "off-grid friendly" place I've researched for this site, and that's mostly a function of it being a fully urban, fully zoned, fully sewered independent city rather than a rural county with open land. If you're dreaming of a quiet off-grid homestead, look elsewhere in Missouri. If you're working within city limits, here's what I found.

Zoning. The whole city is zoned, administered by the City's Planning Commission and Zoning Administrator under the City's own code of ordinances. There's no "unzoned raw land" loophole like you'd find in some rural counties. Lot-size minimums for single- and two-family dwellings are set by city ordinance and have been adjusted over time.

Dwellings, tiny homes, RVs. The zoning and residential codes define what counts as a dwelling and set lot-size minimums, but I could not confirm any citywide ordinance specifically addressing tiny homes or long-term RV living. Treat this as unresolved and call the Zoning Administrator before you buy or build anything unconventional.

Building codes. The City has adopted current ICC-family codes (International Building Code, International Existing Building Code, International Residential Code) plus the National Electrical Code and an amended International Energy Conservation Code. Any off-grid style dwelling built here still has to go through the Building Division and meet these adopted codes, permit required.

Septic and composting toilets. This is the big one. The Metropolitan St. Louis Sewer District (MSD), a bi-jurisdictional agency covering the City and most of St. Louis County, requires properties to connect to the public sewer once one is available nearby. That effectively forecloses new septic systems across most of the city. I found no official confirmation either way on composting toilets, so that's a call to make to MSD or the Building Division.

Greywater and rainwater. I couldn't verify an official city ordinance on greywater reuse, so I'm marking it unclear. Rainwater harvesting is on firmer ground: Missouri state law protects a landowner's right to collect rainwater, and the city actively promotes rain gardens and bioswales through its sustainability program, though installing one means coordinating with MSD and the Board of Public Service.

Wells. No city-specific well ordinance turned up, and state well rules would apply if you drilled one, but the city's municipal water system serves the whole city from the Missouri River, so private wells are essentially a non-issue here, more theoretical than practical.

Full utility disconnection. Between the mandatory MSD sewer hookup rule and a fully built-out water and electric grid, going fully off-grid on utilities in the city is restricted at least on the wastewater side. I found nothing on-record forcing electric or water hookups specifically, but I'd treat that as untested territory rather than a green light.

Bottom line: St. Louis City leans code-heavy and connection-mandatory. If off-grid living is the goal, this brief should mostly serve to explain why you'd look at unincorporated Missouri counties instead.