Zoning, building permits and septic rules in Blendon Township, South Dakota

Rules another office applies inside Blendon Township

Blendon Township does not set these itself; the county, a health district or the state does, and they apply to every address inside its limits.

• Building permitRequired

  Permanent structures in Blendon township (unincorporated Davison County); permits are issued by the county Planning & Zoning office.

  • Fees vary by construction type (county fee schedule 2026).
  • The project must begin within 180 days of the permit date or the permit is void.
  • The permit expires if the project is not substantially completed within two years; an extension can be requested.
  • Municipal permits are issued by the respective municipality; this does not apply to Blendon.

  start deadline: <= 180 days (void if not started)

  “any permanent structures will require a building permit application prior to construction.”

• Local zoningPresent (with conditions)

  Land inside Blendon township, which is unincorporated; Davison County's zoning ordinance applies here. No separate Blendon township zoning ordinance was found.

  • The county ordinance applies in unincorporated areas excluding Ethan, Mt. Vernon and Mitchell, and Mitchell controls its one-mile extraterritorial area.
  • The source does not mention Blendon township by name; its application rests on Blendon being unincorporated.
  • The ordinance has nine district types, including agricultural and agricultural residential; dimensional limits were not extracted.

  “the provisions of this ordinance shall apply within the unincorporated areas of davison county, south dakota, to include loomis but excluding ethan, mt. vernon, and mitchell.”

• Who permits septicMixed (with conditions)

  Septic systems in Blendon township (unincorporated Davison County): state DENR rules, with county zoning requirements tied to the building permit.

  • Systems installed by someone other than the owner must be completed by a licensed person.
  • Soil suitability and percolation tests may be required before a building permit where development is concentrated, as the zoning administrator determines.
  • Conditional use is required for sites 350 to 660 feet from certain drinking-water lakes, rivers or streams.

  “septic systems installed within davison county must comply with all applicable south dakota department of environment and natural resources and state plumbing code regulations, to include ar 74:53:01.”

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.