St. Clair County, Illinois
Caseyville Township is a township in St. Clair County, Illinois. Septic permits inside Caseyville Township come from St. Clair County (St. Clair County Health Department – Water & Private Sewage · 618-233-7769). 5 rules below are quoted from official sources and independently re-checked, most recently on October 30, 2026. Rules for unincorporated land are on the St. Clair County page.
Caseyville Township does not set these itself; the county, a health district or the state does, and they apply to every address inside its limits.
Zoning districts for unincorporated land inside Caseyville township under the St. Clair County zoning code
“for the purpose of this zoning code, the entire county of st. clair outside the limits of cities, villages and incorporated towns which have in effect municipal zoning codes and outside the boundaries of scott air force base, is hereby divided into the following zoning districts:”
Individual domestic sewage disposal (septic) systems on land inside Caseyville township, administered by the St. Clair County Health Department under the county code
“(a) it shall be unlawful for any person to construct, alter or extend individual domestic sewage disposal systems within st. clair county unless he/she holds a valid permit issued by the health department”
Constructing, altering or extending a private septic system on land inside Caseyville township, issued by the St. Clair County Health Department
“(a) it shall be unlawful for any person to construct, alter or extend individual domestic sewage disposal systems within st. clair county unless he/she holds a valid permit issued by the health department”
Subdivision plans for land inside Caseyville township, reviewed by the St. Clair County Health Department for sewage disposal
“there shall be a fee for the review of subdivision plans. the fee shall be based upon the number of proposed lots as follows:”
Zoning compliance letters requested from the St. Clair County Zoning Department for unincorporated land inside Caseyville township
zoning compliance letter fee: 30 USD
“* effective january 2020 zoning compliance letters will have a fee of $30.00.”
We looked and could not find an official answer yet. Silence is not permission; ask Caseyville Township or St. Clair County directly.
Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.
Unanswered questions are usually a sign that Caseyville Township publishes no rule on the point, not that none exists. St. Clair County’s page lists the county offices to call.
Off-grid gear
Going off-grid in Caseyville Township means bringing your own water and power. The kit we’d start with:
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