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Trinity County · Building on your lot

Building in a flood zone in Trinity County

Trinity County's own rules on building in a flood zone, with the code text for every value.

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Each rule below links to the section of the Trinity County Municipal Code it was read from, with the code text one click away (checked October 2026). General information, not legal advice.

What Trinity County's code says

Trinity County code What Trinity County's code adds
Floodplain permit
  • A floodplain development permit is needed before construction or development begins.
    Applies: Areas zoned FH or FHO.
    § 17.29B.220 · code text
    A floodplain development permit shall be obtained before construction or development begins within areas zoned FH or FHO, as established in Articles II and III.
Building in a floodway
  • No encroachment unless it causes no increase in base flood elevation.
    Applies: Regulatory floodways; a registered professional engineer must certify it.
    § 17.29B.090 · code text
    Encroachments, including fill, new construction, substantial improvement, and other new development are prohibited within floodways unless certification by a registered professional engineer is provided demonstrating that encroachments shall not result in any increase in [the base] flood elevation during the occurrence of the base flood discharge.
Height of the lowest floor
  • At least 1 foot above the base flood elevation.
    Applies: New or substantially improved homes and other buildings in special flood hazard areas.
    § 15.16.160 · code text
    New construction and substantial improvement of any structure shall have the lowest floor, including basement, elevated not less than one foot above the base flood elevation.

Who this affects

HomeownersContractorsDesigners

Frequently asked questions

What are the rules for building in a Trinity County flood zone?

Trinity County's code: A floodplain development permit is needed before construction or development begins. (Areas zoned FH or FHO.) (§ 17.29B.220); At least 1 foot above the base flood elevation. (New or substantially improved homes and other buildings in special flood hazard areas.) (§ 15.16.160).

General information, not legal advice.

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Ask GoCodebook how Trinity County's building in a flood zone rules apply to your situation and get an answer that cites the section.

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Trinity County Municipal Code — full text