Bolthole Index

St. Clair County, Illinois

Zoning, building permits and septic rules in Caseyville Township, 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.

Answers from the rulebook for Caseyville Township

Rules another office applies inside Caseyville Township

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 districtsPublished (with conditions)

    Zoning districts for unincorporated land inside Caseyville township under the St. Clair County zoning code

    • The county zoning code applies to the entire county outside cities, villages and incorporated towns that have municipal zoning codes in effect; land inside the Village of Caseyville is not covered by this claim.
    • The code lists districts including A, RR-1, RR-3, SR-1, SR-2, SR-3, SR-MH, MHP, MR-1, MR-2, NB, HB, B-1, B-2, I-1, I-2, C-R, O-1, O-2 and AO.
    • Code revised 05/30/2023 per its footer; that is a revision stamp, not an effective date.
    “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:”
  • Who permits septicCounty (with conditions)

    Individual domestic sewage disposal (septic) systems on land inside Caseyville township, administered by the St. Clair County Health Department under the county code

    • The county ordinance applies within all of St. Clair County, including Caseyville township.
    • Caseyville township operates its own sewer system (see caseyville-utility-connection-sewer); this claim covers only private on-site systems.
    “(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”
  • Septic permitRequired

    Constructing, altering or extending a private septic system on land inside Caseyville township, issued by the St. Clair County Health Department

    • A permit is issued only to a homeowner or to a St. Clair County licensed private sewage disposal installation contractor installing the system.
    • All permit applications go to the Health Department, and the application must be signed and include the applicant name, address and proposed site location.
    • Permit fee and form details were not verified.
    “(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”
  • Subdividing landRegulated (with conditions)

    Subdivision plans for land inside Caseyville township, reviewed by the St. Clair County Health Department for sewage disposal

    • The health ordinance charges a fee for review of subdivision plans based on the number of proposed lots.
    • Subdivision platting and county zoning subdivision rules were not verified.
    “there shall be a fee for the review of subdivision plans. the fee shall be based upon the number of proposed lots as follows:”
  • Permit feesPublished (with conditions)

    Zoning compliance letters requested from the St. Clair County Zoning Department for unincorporated land inside Caseyville township

    • Only the zoning compliance letter fee was verified; building, electrical, occupancy and septic permit fee schedules were not located.
    • The fee is stated as effective January 2020 on the county page; the page does not give a revision date for the fee.

    zoning compliance letter fee: 30 USD

    “* effective january 2020 zoning compliance letters will have a fee of $30.00.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Caseyville Township or St. Clair County directly.

  • Owner-builder exemption — Owner-built homes inside Caseyville township
  • Building code adopted — Construction inside Caseyville township
  • Local zoning — Land inside Caseyville township that is outside the limits of cities, villages and incorporated towns, which is where the St. Clair County zoning code applies; whether Caseyville township itself adopted zoning is unresolved
  • Minimum dwelling size — Minimum dwelling size on unincorporated land inside Caseyville township
  • Minimum lot size — Single-family residential lots in SR-1, SR-2, SR-3 districts and rural residential RR-1, RR-3 districts on unincorporated land inside Caseyville township
15 more unanswered
  • Setbacks
  • Lot coverage
  • Building height
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Manufactured homes
  • Accessory dwellings
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Agricultural exemption
  • Driveway access
  • Short-term rentals
  • Permit process

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.

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