Lynn County, Texas
O'Donnell is a city in Lynn County, Texas. Septic permits inside O'Donnell come from the county and state together. 6 rules below are quoted from official sources and independently re-checked, most recently on November 13, 2026. Rules for unincorporated land are on the Lynn County page.
O'Donnell does not set these itself; the county, a health district or the state does, and they apply to every address inside its limits.
Energy-code baseline applicable to single-family homes and other residences inside O'Donnell city limits; local amendments may apply.
single-family minimum state-mandated code: Chapter 11 of the 2015 International Residential Code · other residences and commercial/industrial applicable code: 2015 International Energy Conservation Code
“The minimum state-mandated code for single-family homes is Chapter 11 of the 2015 International Residential Code. [...] These energy codes are effective statewide.”
On-site sewage facilities, if any, inside O'Donnell city limits.
“If the on-site sewage disposal system is located in the jurisdiction of an authorized agent, the permit is issued by the authorized agent; otherwise, the permit is issued by the commission.”
An on-site sewage facility, including a septic system or holding tank, proposed inside O'Donnell city limits, subject to any local authorized-agent program.
minimum tract under 10-acre exemption: >= 10 acres (Only with all other TCEQ 10-acre-rule conditions.) · minimum OSSF distance from property line under 10-acre exemption: >= 100 feet (Only with all other TCEQ 10-acre-rule conditions.)
“A permit and approved plan are required to construct, alter, repair, extend, and operate an OSSF.”
Use of an on-site sewage disposal system inside O'Donnell city limits.
notice before proposed installation operation: >= 5 working days (Notice is to the commission, authorized agent, or designated representative.)
“An on-site sewage disposal system may not be used unless it is inspected and approved by the commission or the authorized agent.”
On-site sanitation through an OSSF inside O'Donnell city limits.
“A permit and approved plan are required to construct, alter, repair, extend, and operate an OSSF.”
The state OSSF permit process for an on-site sewage facility inside O'Donnell city limits.
“Application for a permit must: (1) be made on a form provided by the commission or authorized agent; and (2) include information required by the commission or authorized agent to establish that the individual sewage disposal system complies with this chapter and rules adopted under this chapter.”
We looked and could not find an official answer yet. Silence is not permission; ask O'Donnell or Lynn County directly.
Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.
Unanswered questions are usually a sign that O'Donnell publishes no rule on the point, not that none exists. Lynn County’s page lists the county offices to call.
Off-grid gear
Going off-grid in O'Donnell means bringing your own water and power. The kit we’d start with:
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