Adams County, CO Environmental Rules: Flood Zones (2026)
FEMA flood zone rules in Adams County, CO, also called floodplain regulations or special flood hazard area (SFHA) rules, determine flood insurance requirements and elevation standards for new construction.
Key Facts
- Governing section
- Building Code § 1612.3
- Flood study adopted
- FEMA study dated December 2, 2021
- Maps incorporated
- FIRM and Flood Boundary and Floodway Map
- Updates
- Automatic with FEMA map revisions
- Enforcing agency
- Adams County Building Safety Division
Summary
Unincorporated Adams County regulates construction in flood hazard areas through Section 1612.3 of its Building Code, which adopts FEMA's Flood Insurance Study and accompanying maps by reference. Any parcel shown on the Flood Insurance Rate Map or Flood Boundary and Floodway Map falls under the county's flood hazard area rules before the Building Safety Division will issue a permit.
1612.3 Establishment of flood hazard areas. To establish flood hazard areas, the applicable governing authority shall adopt a flood hazard map and supporting data. The flood hazard map shall include, at a minimum, areas of special flood hazard as identified by the Federal Emergency Management Agency in a report entitled "The Flood Insurance Study for Adams County and Incorporated Areas (Vols. 1, 2, 3)" ... dated December 2, 2021, as amended or revised with the accompanying Flood Insurance Rate Map (FIRM) and Flood Boundary and Floodway Map (FBFM) and related supporting data along with any revisions thereto. The adopted flood hazard map and supporting data are hereby adopted by reference and declared to be part of this section.
Full Breakdown
3, adopted through Ordinance No. 12 (effective July 1, 2026) as part of the 2024 International Building Code amendments, establishes the county's flood hazard areas by adopting a flood hazard map and supporting data. The section specifically incorporates the Flood Insurance Study for Adams County and Incorporated Areas, dated December 2, 2021, along with the accompanying FEMA Flood Insurance Rate Map (FIRM) and Flood Boundary and Floodway Map (FBFM), and related supporting data along with any revisions thereto. Those documents, once adopted, are declared to be part of the section, so the county's flood hazard boundaries update automatically whenever FEMA issues a revision, without a separate county ordinance being required each time.
Because the flood hazard designation is tied directly to the FIRM and FBFM, a property owner in unincorporated Adams County has to check the current FEMA map for the parcel before applying for a Building Safety Division permit; land shown in a mapped special flood hazard area triggers the additional design and construction requirements that the 2024 International Building Code applies to those zones. The county did not rewrite those downstream design provisions in Ordinance No. 12, so the model code's flood-resistant construction standards apply as published for any parcel that falls inside the adopted hazard area.
Violations & Fines
Building in an identified flood hazard area without meeting the adopted FIRM/FBFM-based requirements is enforced the same as any other violation of Ordinance No. 12: a fine of up to $1,000 per separate violation under C.R.S. § 30-28-409, with each day of noncompliance treated as a new offense until the Building Safety Division confirms the work meets the flood hazard area standards.
Frequently Asked Questions
How does Adams County decide if my property is in a flood hazard area?
Does the county update its flood maps on its own schedule?
Who enforces flood hazard area rules for unincorporated Adams County?
Sources & Official References
Other rules in Adams County
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