Buying Land in St. Clair County, Michigan

A solar zoning fight the county lost -- directly relevant to leasing land here

The single most consequential land-use development in St. Clair County recently involves solar and battery-storage siting. The county adopted its own regulations, effective May 1, 2025, that were stricter than the standards set by Public Act 233 of 2023 (Michigan's statewide renewable-energy siting law) -- including a 45-decibel noise limit at non-participating property lines (versus PA 233's 55-decibel cap), a requirement for Health Department approval before construction, and a decommissioning financial-assurance requirement of at least $100,000 per megawatt. DTE Electric sued the county, its Board of Commissioners, and its Health Department on July 3, 2025, arguing the county's rules exceeded what PA 233 permits local governments to impose, and a St. Clair County Circuit Court judge sided with DTE, overturning the county's rules.

If you're considering leasing land in St. Clair County for a solar or wind project, or simply buying near a proposed one, this court ruling is directly relevant to what the county can and cannot require going forward. See our dedicated wind-solar-leasing page for St. Clair County for more detail on the ruling and what it means in practice.

Zoning: handled township-by-township

General land-use zoning in St. Clair County is administered at the township and city level rather than countywide. St. Clair Township, Grant Township, Riley Township, and Casco Township are just a few examples of local jurisdictions here that each maintain their own separate zoning ordinance, zoning map, and planning commission. No clear evidence of a countywide fallback zoning ordinance was found in this research pass; the county's own Metro Planning Commission appears to play a coordinating and referral role on zoning amendments across the county rather than administering a single ordinance of its own. Confirm zoning status directly with the specific township or city for any candidate parcel.

The international border: a real but narrowly-localized fact

St. Clair County's eastern boundary is the St. Clair River, and beyond it lies Sarnia, Ontario, Canada -- an international border crossed by the Blue Water Bridge, the second-busiest commercial US-Canada crossing after Detroit-Windsor's Ambassador Bridge. That border proximity has had at least one concrete, documented land-use consequence: a roughly $165 million customs plaza expansion around the bridge required demolishing more than 100 properties in Port Huron over the past couple of decades. That said, this research pass found no evidence of any broader, ongoing border-security-driven land-use restriction or special zoning designation applying generally across the rest of the county -- so while the border is a genuinely distinctive feature of St. Clair County's geography, don't assume it carries land-use implications for a parcel that isn't specifically near the bridge/customs plaza footprint itself; verify directly for anything close to that immediate area.

Septic and wells: St. Clair County Health Department

Septic system and well permitting in St. Clair County is handled directly by the St. Clair County Health Department (not through a shared multi-county district). Its Environmental Health Division covers on-site sewage disposal systems, drinking water wells, site reviews and permit issuance, stormwater, bathing-beach monitoring, and soil erosion and sedimentation control, with dedicated sanitarians for wells, septic systems, and related programs. The department also runs a 24-hour anonymous tipline for reporting failing septic systems, illegal dumping, or water-quality concerns -- worth knowing if you're evaluating a parcel where an existing septic system's condition is in question.