Zoning › State preemptions › Indiana

Indiana 327 IAC 8-4.1 — Wellhead Protection Area Program (IDEM) (IN)

Tracked preemption from the Indiana overlay bundle.

Overview

← All state preemptionsIndiana overlay roll-upIndiana zoning wikiIndiana building codesFederal overlaysGlossaryFederal-conflict: Not flagged
Effective
1997-12-12
Sunset
—
Authority
state
Scope
state:IN
Other Indiana preemptions
Indiana HB 1001 (2026) — Statewide Housing-and-Zoning Reform (Default By-Right with Annual Local Opt-Out)Indiana HEA 1210 (2025) — Strengthened STR Preemption / No Numeric Rental CapsIndiana HEA 1005 (2025) — RIF Loan Priority Conditioned on Pro-Housing Land-Use PoliciesIndiana Code 5-1.2-15.5 — Residential Housing Infrastructure Assistance Program (RHIAP / RIF, created by HEA 1005 of 2023)Indiana Code 32-31-1-20 — Rent Control & Mandatory Inclusionary Zoning PreemptionIndiana Code 36-1-24 — Short-Term Rental Preemption (Owner-Occupied as Permitted Residential Use)Indiana Code 13-19 — Environmental Management Generally / IFA Brownfields ProgramIndiana Code 13-18-22 — State Regulated Wetlands Permit (IDEM)

Trigger predicate

When this evaluates true for a parcel, the law's preempted fields take precedence over base zoning.

OR
  • city.has_wellhead_protection_plan == True
  • parcel.geometry geographic match

Preempted fields

2 fields on the base district schema are rewritten when the trigger fires.

FieldOpValueNote
review_typerequireWHPA_local_plan_implementationCommunity public water-supply systems must adopt an IDEM-approved Wellhead Protection Plan delineating a minimum 5-year time-of-travel (TOT) modeled WHPA or a 3,000-foot fixed-radius WHPA, with management strategies for potential contaminant sources.
base_districts[*].whpa_use_restrictionsimplement_through_local_plan—WHPA management implemented through local zoning/land-use overlays adopted under each utility's Phase II Plan; specific use restrictions vary by community.

Citation

Authority source
327 Ind. Admin. Code 8-4.1 (Wellhead Protection); IDEM Source Water Protection Program
§ 327 IAC 8-4.1-1(27) (WHPA definition); 327 IAC 8-4.1 Phase II plan requirements
https://iar.iga.in.gov/iac//title327.html

Research notes

Implements the 1986 federal Safe Drinking Water Act Wellhead Protection Program (42 U.S.C. §300h-7), but boundary delineations are confidential per IDEM policy — captured as a known data gap. Cities with `has_wellhead_protection_plan=true` should be flagged for downstream parcel-level overlay rendering, but the polygons themselves require utility consent to surface.