Digital permit application gateway
Start with the issuing authority’s own submission lane. A complete application package, accurate valuation, and accessible inspection path are the fastest route through statutory plan review.
Recommended first click
Use the official digital gateway to submit plans, monitor review comments, pay required charges, and request inspections when the permit is issued. If the link is unavailable, use the agency website or phone number on the administrative profile to confirm the current lane.
Typical review lane
The OSSF Authorization to Construct is valid for one year; inspection must be requested at least five working days in advance, and a Notice of Approval is issued approximately five working days after a successful inspection. The county development/floodplain permit is valid one year and must be renewed if work is not completed. No standard initial plan-review duration is published.
Treat this as a planning signal, not a guaranteed approval date. Completeness, corrections, resubmittals, and agency workload control the actual clock.
Verify the parcel is inside this agency’s service area and note whether a city, state, fire marshal, septic authority, or utility district also has approval authority.
Prepare legible plans, site information, project valuation, ownership authorization, contractor information, and any energy, floodplain, zoning, or utility documentation the issuing office requires.
Keep the permit number, approved plan set, correction comments, fee receipts, and inspection results together. Those records establish the compliance trail for the next trade.
Application documents
Before submission, call Sanitation/Floodplain Officer Eli Castillo: 325-347-2477 if the project involves a change of occupancy, structural alteration, accessory structure, demolition, or work near a regulated environmental feature.
Source trail
Use these direct agency or licensing links to confirm current instructions before you file, pay, or schedule work. External pages control if their information differs from this directory.
Project questions
Mason County Sanitation and Floodplain Office is the identified county-level authority for this profile. Confirm that the property is in its service area before filing.
No verified online portal was located in the reviewed public materials. Contact Sanitation/Floodplain Officer Eli Castillo: 325-347-2477 and request the current application route before preparing a final submittal.
The OSSF Authorization to Construct is valid for one year; inspection must be requested at least five working days in advance, and a Notice of Approval is issued approximately five working days after a successful inspection. The county development/floodplain permit is valid one year and must be renewed if work is not completed. No standard initial plan-review duration is published.
Submit the complete OSSF packet, floor/construction plan, and nonrefundable fee to the county Designated Representative. After plan approval and issuance of Authorization to Construct, call Eli Castillo at 325-347-2477 at least five working days before the system is ready; do not cover it before inspection. The county issues a Notice of Approval after a successful inspection and payment of all fees. For floodplain/development review, file the included development application and provide one copy of plans and specifications for construction in a floodplain; the administrator determines flood-hazard status, other required permits, and approval or rejection.
Mason County administers a county development/floodplain permit for residential and nonresidential new construction, substantial improvements, houses, mobile homes, commercial work, fill, and alteration of waterways or drainage courses. It enforces its floodplain regulations and NFIP requirements, county subdivision regulations, and an authorized-agent OSSF program under Texas Health and Safety Code Chapter 366 and 30 TAC Chapter 285. The county OSSF rule is stricter than the state acreage exception: every new OSSF must be permitted regardless of tract size. No countywide ICC structural building-code edition or general trade-permit code was found. Mason County expressly does not recognize an acreage exemption for new OSSF installations: every new system must be permitted regardless of property size. The floodplain administrator may issue an exemption certificate when a proposed development is outside an identified special flood hazard area, but the county warns that this is not a guarantee against flooding and does not waive other county, state, or federal approvals. No cosmetic-building-work exemption list is published.
What makes an application complete
Before you click submit, make sure the drawings agree with the site plan, project description, valuation, ownership authorization, and contractor information. If the work changes structure, occupancy, drainage, fire protection, energy performance, or utility demand, describe that scope plainly. Ambiguous narratives create correction cycles and delay the field schedule.
Save the confirmation number, payment receipt, uploaded plan set, and every correction comment. Those records are the backbone of a defensible compliance file when multiple trades or agencies share responsibility.
Submission quality check
Site: address, parcel, access, setbacks, and existing conditions are consistent.
Scope: structural, mechanical, plumbing, electrical, fire, and energy work is identified.
Closeout: inspection contacts and the final approval path are understood before work begins.