Administrative overview · FIPS 48319
Mason County permit authority
The first compliance decision is jurisdictional: identify the office with statutory authority over your parcel, then use its filing and inspection sequence to keep the project moving.
Jurisdictional status
County
This county profile is the primary starting point for unincorporated-area permitting.
Responsible agency
Mason County Sanitation and Floodplain Office
For a project in or near Mason County, this office is the identified point of contact for permit intake, statutory code enforcement, plan review coordination, and inspection release conditions. Confirm the parcel’s boundary and project type before relying on the county lane.
Direct contact
Sanitation/Floodplain Officer Eli Castillo: 325-347-2477
Call before mobilizing if the project has a boundary, occupancy, fire, septic, or utility question.
Permit counter
Mason County Sanitation and Floodplain Office, 201 Ft. McKavett Street, Mason, TX 76856
Operating hours
Phone hours Monday-Friday, 8:00 a.m.-5:00 p.m.; after-hours contact is available by email
Review expectation
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.
Compliance workbench
Choose the next project decision.
Apply online
Open the verified digital gateway, application form, and review timeline.
Open guide →Fees & penalties
Understand fee schedules, enforcement exposure, and stop-work liabilities.
Open guide →Codes & exemptions
Read the code framework, minor-work exemptions, and inspection lane.
Open guide →Agency website
Visit the primary public source for current notices and contact changes.
Open guide →Source trail
Official sources for this profile
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
Frequently asked questions for Mason County
Who handles permitting for this jurisdiction?
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.
How should I begin an application?
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.
How long might review take?
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.
How are inspections scheduled?
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.
Which codes and exemptions should I review?
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.