Environmental Rules in Boone County, IN (2026)
4 rules for unincorporated Boone County, Indiana.
Verified from official government sources
Stormwater Management
Boone County Code Section 53.021 bars discharging any substance other than stormwater into a county MS4 conveyance, watercourse or waterbody, and the Boone County Drainage Board and County Surveyor can order dischargers to use best management practices to cut pollutants. Violators face a civil infraction fine of up to $5,000 for a first offense and $10,000 for repeat violations under Section 53.999.
Boone County Bans Illegal Stormwater Discharges
Some RestrictionsBoone County Code §§ 53.021, 53.999(C)(1)
(A) No person shall discharge to a MS4 conveyance, watercourse, or waterbody, directly or indirectly, any substance other than stormwater or an exempted discharge. Any person discharging stormwater shall effectively minimize pollutants from also being discharged with the stormwater, through the use of best management practices (BMPs). (B) The Boone County Drainage Board and/or Boone County ...
Erosion Control
Boone County requires a Stormwater Pollution Prevention Plan with erosion and sediment control measures for any project disturbing 10,000 square feet or more of land, under Code Section 53.050. Sites disturbing an acre or more need a full SWPPP submitted to the Drainage Board and County Surveyor, and chapter violations are civil infractions fined up to $5,000 for a first offense.
Boone County Erosion Control on Construction Sites
Some RestrictionsBoone County Code §§ 53.050, 53.051
The Boone County Drainage Board and/or Boone County Surveyor will require a Stormwater Pollution Prevention Plan (SWPPP), which includes erosion and sediment control measures and materials handling procedures, to be submitted as part of the construction plans and specifications. Any project located within Boone County that includes clearing, grading, excavation, and other land disturbing activi...
Flood Zones
Unincorporated Boone County, Indiana requires a floodplain development permit before any building, filling, or grading in a special flood hazard area under Boone County Code § 152.12. New and substantially improved residential structures must hold their lowest floor at least two feet above the base flood elevation under § 152.36(B), and violators face daily fines enforced by the Area Plan Commission.
Boone County, IN Flood Hazard Area Rules
Some RestrictionsBoone County Code § 152.36(A), (B)
In all SFHAs, the following provisions are required: (A) In addition to the requirements of § 152.35, all structures to be located in the SFHA shall be protected from flood damage below the FPG. This building protection requirement applies to the following situations: ... (4) Installing a travel trailer or recreational vehicle on a site for more than 180 days; ... (B) Residential construction. ...
Flood Elevation Requirements
Boone County requires new or substantially improved residential structures in a special flood hazard area to elevate the lowest floor, including any basement, to or above the Flood Protection Grade, two feet above the base flood elevation. Non-residential structures must meet the same two-foot freeboard or be floodproofed to that level, enforced by the Area Plan Commission under Chapter 152's floodplain development permit.
Boone County Flood Elevation Freeboard Standard
Some RestrictionsBoone County Code § 152.36
(B) Residential construction. New construction or substantial improvement of any residential structure (or manufactured home) shall have the lowest floor; including basement, at or above the FPG (two feet above the base flood elevation). Should solid foundation perimeter walls be used to elevate a structure, openings sufficient to facilitate the unimpeded movements of floodwaters shall be pro...
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