Watonwan County, Minnesota
Lewisville is a city in Watonwan County, Minnesota. Septic permits inside Lewisville come from the county and state together. 4 rules below are quoted from official sources and independently re-checked, most recently on November 5, 2026. Rules for unincorporated land are on the Watonwan County page.
Lewisville does not set these itself; the county, a health district or the state does, and they apply to every address inside its limits.
Buildings governed by the State Building Code, including those inside Lewisville city limits.
“The State Building Code is the standard that applies statewide”
Individual subsurface sewage treatment systems serving land inside Lewisville city limits.
“The Planning and Zoning Department shall regulate ISTS and septage disposal in Watonwan County pursuant to this section.”
Installation, replacement, alteration, repair, or extension of an individual sewage treatment system inside Lewisville city limits in Watonwan County.
permit expiration: 9 months after date of issuance
“A permit shall be obtained whenever any ISTS in Watonwan County is installed, replaced, altered, repaired or extended.”
New water-supply wells inside Lewisville city limits.
“Prior to the start of drilling a water-supply well, the Contractor or well owner must submit a “notification” form, with the appropriate fee, to MDH.”
We looked and could not find an official answer yet. Silence is not permission; ask Lewisville or Watonwan 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 Lewisville publishes no rule on the point, not that none exists. Watonwan County’s page lists the county offices to call.
Off-grid gear
Going off-grid in Lewisville means bringing your own water and power. The kit we’d start with:
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