Septic in Eastland County, TX

Last updated: Mar 21, 2026

Welcome to Eastland County, where wide skies meet practical home solutions and neighbors look out for one another. If you're exploring properties here, you'll notice many homes sit farther from town sewer lines than in big-city suburbs—and that's part of the local rhythm. Is septic common in Eastland County? Yes. For most rural and semi-rural homes, on-site septic systems are the standard. Should I expect septic if I own or buy a home? In this county, odds are high you'll either already have a septic system or you'll be buying a home that relies on an on-site system, or you'll be planning for one if you're building on land not yet connected to a sewer.

Why homes here typically use septic systems comes down to how Eastland County developed. The area is largely rural, with farms, ranches, and small towns spread across generous land. Extending municipal sewer lines to every property isn't practical or economical when homes sit miles apart. On-site septic lets wastewater be treated right on the property, while local soils assist with the natural filtering process. Local guidelines emphasize proper design, installation, and regular maintenance to protect groundwater and wells that supply homes in the region.

County growth history and how that has impacted septic coverage: Eastland County has grown gradually, with growth centered around Eastland and a few smaller communities. Development has shifted from traditional ranch and farm homesteads to more dispersed residential parcels, but overall population density remains low. That pattern means private septic systems are common across much of the county, including newer subdivisions and older homes alike. If you're buying, you'll often encounter a septic system at the heart of the home's wastewater plan, and it's smart to evaluate its condition as part of the purchase.

High-level explanation (why septic exists here): on-site wastewater systems fit the rural land use, soil, and water protection needs of Eastland County. When properly designed, installed, and maintained, septic systems work well for many decades and keep wastewater management practical and affordable for homes spread across the county.

Below you'll find practical guidance, local contacts, and straightforward steps to keep your system healthy.

How Septic Is Regulated in Eastland County

Who regulates septic systems in Eastland County

In Eastland County, septic systems (OSSFs) are governed by state rules with local administrative oversight. The Texas Commission on Environmental Quality (TCEQ) sets the statewide standards for design, installation, operation, and maintenance of on-site sewage facilities. Eastland County's Environmental Health Office handles local permitting, site evaluation, inspections, and enforcement in coordination with TCEQ guidelines. If you're unsure which rules apply to your property, start with the county office and verify against state guidance.

  • State role: establishes technical requirements, design criteria, setback distances, and reporting expectations.
  • Local role: administers permits, conducts soil/site evaluations, oversees installation and inspections, and keeps records.
  • Enforcement: noncompliance may trigger stop-work orders, corrective action requirements, or fines.

Permitting and design process

Before breaking ground, you'll typically go through a permitting stage that covers site assessment, system design, and installation plans.

  1. Contact Eastland County Environmental Health or the designated local authority to confirm the OSSF permitting path.
  2. Obtain a site evaluation or soil assessment if required (soil type, percolation, and drainfield capacity matter).
  3. Hire a licensed designer or engineer for system plans, especially for complex or large systems.
  4. Submit the design plan and permit application with any required fees.
  5. Receive permit approval and follow the installation schedule as outlined in the permit.
  6. Design requirements: plans must show drainfield location, tank placement, depth, access, and recommended dosages or treatment components as appropriate.
  7. Special cases: for certain systems or property types, additional state review or engineering validation may be needed.

Inspections and compliance

Active OSSFs must be inspected at key milestones to verify compliance with the permit and state standards.

  • Pre-installation/site prep inspection: confirms site suitability, setbacks, and access.
  • In-progress inspections: verify trenching, backfill, tank placement, seams, baffles, risers, and venting.
  • Final inspection: confirms all components are installed correctly, labeled, and functional; records are updated.

Common compliance points to be ready for:

  • Setbacks from wells, property lines, flood zones, and structures.
  • Correct tank sizing, separation distances, and effluent disposal to the drainfield.
  • Proper backfill, tiling, and surface grading to prevent runoff toward the system.
  • Access ports and labeling for maintenance.

Maintenance, records, and long-term care

Ongoing maintenance helps prevent failures and protects groundwater.

  • Pumping schedule: typical traditional septic tanks are pumped every 2–3 years; more frequent pumping may be advised for smaller tanks, high usage, or specialty systems. Reserve 3–5 years for low-usage homes with conventional designs.
  • Record-keeping: keep copies of permits, design drawings, inspection reports, pump receipts, and maintenance notes; these are useful for future sales or repairs.
  • Protect the drainfield: keep heavy equipment off the drainfield, avoid parking on it, plant only shallow-rooted grasses, and prevent tree roots from growing toward the system.
  • Household practices: minimize harsh chemicals, solvents, or non-biodegradable wastes entering the system; dispose of grease and oils properly.

What homeowners should do now

  • Confirm your property's regulatory path with Eastland County Environmental Health and the state guidelines.
  • Schedule a site evaluation early if you're buying land or replacing an OSSF.
  • Work with a licensed designer for any new installation or major modification.
  • Keep maintenance reminders and service records in a dedicated file for easy reference.

Official resources

  • Texas Commission on Environmental Quality (TCEQ) – On-Site Sewage Facilities (OSSF) program:
  • Texas Administrative Code – On-Site Sewage Facilities (official rule source): (search for OSSF or "Title 30, Part 1, Chapter 285" for the relevant regulations)

Soil, Groundwater & Environmental Factors in Eastland County

Local soil characteristics and how they affect septic sites

  • Eastland County soils are varied, but many areas feature clay-rich horizons with slow infiltration and noticeable shrink-swell potential. Some spots have deeper, loamy layers or bedrock near the surface.
  • Infiltration rates can be slow in clayey soils, which means septic drain fields require careful sizing and sometimes alternative designs.
  • Slope, depth to rock, and soil compaction influence leach field performance. Gentle slopes and well-drained pockets are preferable, while perched or perched-on-clay conditions may limit where a conventional drain field can go.

Groundwater depth and seasonal fluctuations

  • Groundwater depth in Eastland County shifts with rainfall, droughts, and aquifer conditions. In places with shallow groundwater or a perched water table, effluent movement can reach the water table more quickly.
  • During wet seasons, higher water tables can shorten the effective season for traditional drain fields. During drought, soil moisture drops, which can affect treatment and distribution within the system.
  • In areas with shallow groundwater or nearby watercourses, specialized designs (such as elevated or mound systems) may be required to meet regulatory standards and protect water quality.

Surface water, drainage & flood considerations

  • Proximity to streams, floodplains, or low-lying depressions increases the risk that surface runoff or elevated groundwater could impact a septic system.
  • Proper grading, drainage, and separation from surface water help minimize the chance of untreated effluent reaching waterways.
  • In flood-prone pockets, homeowners should discuss alternatives with a licensed septic designer to avoid field saturation or field failure after heavy rain events.

Environmental protections and regulatory context

  • Local conditions influence setbacks, design criteria, and inspection requirements. Texas regulations for onsite sewage facilities (OSSF) emphasize protecting groundwater and drinking-water supplies.
  • Always verify site suitability with your county health department and the Texas Commission on Environmental Quality (TCEQ) OSSF program before installation or modification.
  • Consider neighboring wells, streams, and property boundaries when siting a system to reduce cross-contamination risk.

Practical homeowner steps to assess your Eastland County site

  1. Identify soil type and infiltration on your property:
    • Use the NRCS Web Soil Survey to view soil maps for your exact parcel and nearby areas.
  2. Check groundwater depth and water features:
    • Review local groundwater data through the Texas Water Development Board (TWDB) and consult with the county health department for local conditions.
  3. Consult a licensed septic designer early:
    • An experienced professional can evaluate soil depth, percolation rates, and the potential need for mound or other alternative designs.
  4. Plan for site-specific testing:
    • Expect soil evaluations and percolation tests as part of OSSF design and permitting requirements.
  5. Account for weather and seasonal changes:
    • Consider how wet seasons and droughts could affect system performance and maintenance needs, and plan accordingly.

Typical Septic System Types in Eastland County

Conventional gravity septic systems

  • How it works: A septic tank separates solids; clarified effluent flows by gravity into a soil absorption drainfield.
  • Best fit: Typical lots with adequate soil permeability and sufficient depth to groundwater.
  • Pros: Simple, cost-effective upfront; reliable when soils are suitable.
  • Cons: Performance depends on soil conditions; can fail if the drainfield is flooded or the ground is too shallow.
  • Maintenance steps:
    1. Have the tank inspected every 3–5 years.
    2. Pump the tank as needed—often every 3–5 years based on usage.
    3. Protect the drainfield from compaction, heavy equipment, and excess surface water.

Low-Pressure Dose (LPD) systems

  • How it works: A pump doses small amounts of effluent to the drainfield under pressure, improving distribution in marginal soils.
  • Best fit: Properties with shallow soils, slight slope, or limited drainfield area.
  • Pros: More even distribution reduces saturation and greening of the drainfield; can extend system life in tighter sites.
  • Cons: Higher initial cost; more moving parts require regular maintenance.
  • Maintenance steps:
    1. Schedule routine service for the pump and control panel.
    2. Keep the dosing chamber accessible and free of debris.
    3. Have periodic inspections of the distribution lines and drip components if used.

Aerobic Treatment Units (ATU)

  • How it works: An aerobic chamber treats wastewater with added oxygen, giving higher-quality effluent before it reaches the drainfield or irrigation area.
  • Best fit: Areas with limited soil permeability or where local codes require enhanced treatment.
  • Pros: Better effluent quality; can be paired with spray irrigation or shallow dispersal.
  • Cons: Requires electricity and ongoing maintenance; more components mean more potential points of failure.
  • Maintenance steps:
    1. Use a licensed operator for regular servicing (often quarterly).
    2. Monitor alarms and replace components as recommended by the manufacturer.
    3. Schedule annual inspections of the absorption area or irrigation system.

Sand filter systems

  • How it works: After the septic tank, effluent passes through a sand filter for secondary treatment before dispersal.
  • Best fit: Sites with soils that don't provide adequate natural filtration.
  • Pros: Higher treatment performance and flexibility on marginal soils.
  • Cons: Requires space, regular maintenance, and professional oversight.
  • Maintenance steps:
    1. Inspect the sand filter periodically for clogging or buildup.
    2. Schedule professional servicing per local code.
    3. Keep surface loading, landscaping, and drainage away from the system to prevent clogging.

Mound systems

  • How it works: A raised drainfield built on sand or aggregate—used where native soil is unsuitable or the water table is high.
  • Best fit: Properties with shallow depth to bedrock or high groundwater, and limited workable soil depth.
  • Pros: Expands installable areas; reliable on challenging soils.
  • Cons: Higher cost and more complex maintenance; requires more space.
  • Maintenance steps:
    1. Have annual inspections by a qualified OWTS professional.
    2. Monitor for settling, surface exposure, or vegetation over the mound.
    3. Ensure access and maintenance routing remain clear.

Drip irrigation or other innovative distribution systems

  • How it works: Distributes effluent through small, precise lines for soil absorption or irrigation applications.
  • Best fit: Lots with limited space or where water-efficient distribution is desired.
  • Pros: Water savings; flexible siting of the drainfield.
  • Cons: Relatively specialized; higher upfront costs; requires skilled installers.
  • Maintenance steps:
    1. Regularly check filters and emitters for clogs.
    2. Inspect lines for leaks or damage.
    3. Have a qualified professional service the system as needed.

Local considerations in Eastland County

  • Soils in Eastland County vary; a professional site evaluation helps determine the right type.
  • Groundwater depth, slope, and tree roots can influence system choice and placement.
  • Permits and inspections are required; work with licensed installers and refer to state guidance.

Official resources

  • Texas Commission on Environmental Quality (OWTS guidance):
  • Texas Department of State Health Services (OSSF programs):
  • EPA Septic Systems homeowner guidance:

Typical Septic Issues Across Eastland County

Common Causes in Eastland County

  • Soils with variable drainage, including clay-heavy profiles, can slow groundwater absorption and raise the risk of a failing drainfield.
  • Shallow or perched groundwater and high water tables, especially after heavy rainfall, can saturate the drainfield and reduce treatment efficiency.
  • Tree roots, concrete slabs, and buried utilities encroaching on the drainfield disturb soil structure and clog pipes.
  • Overloading the system with water (excessive laundry, long showers, or faulty fixtures) overwhelms the tank and reducing bacteria's ability to treat waste.
  • Improperly installed systems or repairs that don't meet local or state requirements can create ongoing performance problems.

Signs Your System Needs Attention

  • Slow or backup drains, toilets that gurgle, or water bubbling in the yard over the drainfield.
  • Unpleasant sewage odors near plumbing, manholes, or the drainfield area.
  • Standing water or soggy, lush vegetation above the drainfield (not caused by rainfall).
  • Sump or septic tank lid seepage or unusual wet spots in the yard.
  • Frequent need for pumping or repairs, especially if pumping is needed more often than every 3–5 years.

Drainage and Drainfield Challenges

  • Root intrusion from trees or shrubs that physically damage pipes and reduce soil permeability.
  • Compacted soil or recently disturbed soil around the drainfield reducing infiltration.
  • Grading issues that pool water on the surface or direct runoff away from the drainfield.
  • Ice, frost heave, or seasonal temperature swings that temporarily slow septic system performance.

Maintenance Best Practices

  • Pumping every 3–5 years (or per manufacturer/installer guidance) and keeping a service record.
  • Conserving water: spread out laundry, fix leaks, install high-efficiency fixtures, and use toilets labeled septic-safe.
  • Avoid flushing non-biodegradable items, grease, solvents, pesticides, or chemicals down drains.
  • Keep the drainfield area clear: no vehicles, heavy equipment, or landscaping that could compact the soil.
  • Use a septic-safe toilet tissue and consider a filter or baffle inspection as part of routine maintenance.
  • Regular inspections by a licensed septic contractor to catch issues before they cause backups.

Step-by-step Quick Actions if You Suspect a Problem

  1. Note the symptoms: which fixtures are affected, when it started, and any patterns after rainfall.
  2. Minimize water use: stagger laundry, avoid long showers, and limit dishwasher activity until inspected.
  3. Check for obvious signs: surface pooling, strong odors, or new wet spots in the drainfield area.
  4. Call a licensed septic professional for an on-site inspection and, if needed, camera inspection of pipes and a tank assessment.

When to Call a Licensed Pro

  • Persistent backups or odors despite minimized water use.
  • Visible wet spots, drainfield surface pooling, or effluent near the tank or field.
  • Repeated pumpings within a short period or suspected root intrusion or pipe collapse.
  • If you're unsure about system design, installation quality, or local permit requirements.

Local Regulations and Permits

  • On-site wastewater systems in Texas are regulated at the state level by the Texas Commission on Environmental Quality (TCEQ); local counties, including Eastland, issue permits and perform inspections for repairs, replacements, and new installations.
  • Work on a septic system typically requires proper permitting, proper disposal of wastewater, and adherence to setbacks from wells, property lines, and water features.

Resources and References

  • EPA Septic Systems:

Septic Inspection, Permits & Local Oversight

How oversight works in Eastland County

  • In Texas, On-site Sewage Facilities (OSSFs) are regulated at the state level (TCEQ) with local authorities enforcing permits and inspections. Eastland County relies on its Environmental Health team to issue permits, inspect installations, and ensure that OSSFs meet state and local standards.
  • If your property is in an incorporated town, the city government may handle some permits or inspections; in rural parts outside city limits, the county health office usually takes the lead. Always confirm with your local office who issues permits for your parcel.
  • Official resources:
    • Texas Commission on Environmental Quality (TCEQ) OSSF program:

Permits you may need

  • A permit is typically required for:
    • New installation of an OSSF
    • Replacement or relocation of an existing system
    • Additions or substantial modifications to the drain field or septic tank
    • Repairs after a failure or back-up
  • What to expect in the permit process:
    • Property owner or licensed installer submits an application with site evaluation, soil assessment, and proposed plan
    • The managing authority (Eastland County Environmental Health or your city) reviews and approves or requests revisions
    • Permits come with conditions (setbacks, tank placement, drain-field sizing) that must be followed
    • Permit is tied to the work timeline; starting without a permit can trigger fines or stop-work orders
  • Helpful tips:
    • Have a licensed OSSF installer or designer prepare the plan
    • Gather property deeds, parcel maps, and any prior OSSFs records to speed up review
    • Keep copies of all permits, plans, and inspection reports for your records

Inspections: a step-by-step process

  1. Plan and permit submission
  2. Hire a qualified OSSF professional.
  3. Submit a complete permit package with design plans, soil logs, and site drawings.
  4. Await permit approval before any trenching or digging begins.
  5. Mid-construction checks
  6. Inspections occur at key milestones (pre-backfill, tank placement, piping layout, drain-field trenches).
  7. County or city inspectors verify materials, elevations, line slopes, and adherence to setback rules.
  8. Final installation inspection
  9. The inspector confirms proper tank placement, baffle orientation, access risers, effluent filters, and the functioning drain-field layout.
  10. Any deficiencies must be corrected and re-inspected.
  11. Operating approval
  12. After passing the final inspection, you receive a certificate of compliance or operating permit.
  13. Begin regular use only after the final approval is posted.
  14. Post-installation maintenance
  15. Some OSSFs require maintenance records or pump-out schedules; keep pumping receipts and service logs as part of your property records.

Real estate transactions and ongoing records

  • If you're buying or selling, be prepared to provide permit and final inspection documentation to the new owner.
  • Schedule any required follow-up inspections if the system shows signs of impairment (backups, odors, slow drainage).
  • Maintain a simple file with permits, inspection reports, pump-out dates, and any repair work.

Quick-access resources and contacts

  • Eastland County Environmental Health Department (confirm permit and inspection steps): visit the Eastland County site and navigate to Environmental Health for contact information.
  • Texas Commission on Environmental Quality (OSSF program): https://www.tceq.texas.gov/permitting/ossf

Common questions homeowners in Eastland County ask

  • Do I need a permit for a replacement septic tank? Yes, a permit is typically required for replacement or significant repair work.
  • Who issues the permit—the county or the city? It depends on where the property is located and local arrangements; start with the Eastland County Environmental Health Department and your city if applicable.
  • What if there's a failure after installation? Contact the local health department immediately; a re-inspection and corrective work may be required.

Cost Expectations for Septic Services in Eastland County

Septic Tank Pumping and Cleaning

  • What this service includes: removal of accumulated sludge and scum, inspection of tank inlet and outlet baffles, and a brief check of the inlet and outlet pipes. Regular pumping helps prevent backups and extended downtime in Eastland County's rural setups.
  • Eastland County notes: many homes have larger tanks or limited access roads; winter conditions can affect scheduling. Access to the tank lid and clear drive paths influence cost.
  • Typical cost in Eastland County: $250–$600 depending on tank size, accessibility, and how full the tank is.

Septic System Inspection and Dye Test

  • What this service includes: a visual and functional inspection of the tank, distribution box, and leach field; dye tracing to verify proper effluent flow and identify leaks or dosing issues; a written report.
  • Eastland County notes: common when buying/selling property or renewing permits; some older systems may require more thorough evaluation.
  • Typical cost in Eastland County: $150–$350 for a standard inspection; $150–$400 for a dye test or a bundled package often runs $300–$500.

Drain Field Repair and Replacement

  • What this service includes: locating the failing leach field, diagnosing issues (clogged laterals, compacted soil, broken lines), repairing or replacing trenches, and testing afterward.
  • Eastland County notes: soil types here can vary; clay soils and shallow bedrock may necessitate drain field realignment or alternative designs like mounds in some lots.
  • Typical cost in Eastland County: $1,500–$5,000 for targeted field repairs; $5,000–$15,000+ for full leach field replacement; more for mound or advanced designs.

Septic System Installation (New)

  • What this service includes: site evaluation, soil testing, system design, permitting coordination, tank installation, and field installation tailored to site constraints.
  • Eastland County notes: many rural lots require specialized designs (mounds or alternative drain fields) due to soil depth and composition; permitting can involve state and county processes.
  • Typical cost in Eastland County: $7,000–$25,000+ depending on tank size, field type, and site conditions.

System Design and Permitting

  • What this service includes: soil evaluation, system layout, engineering (if required), and submission to the appropriate local/regional authority for permits.
  • Eastland County notes: timing may hinge on state and local review; some projects bundle design with the permit application.
  • Typical cost in Eastland County: $1,000–$3,000.

Perc Test / Soil Evaluation

  • What this service includes: soil borings or probing to determine absorption rate, groundwater proximity, and suitability for a particularsystem design.
  • Eastland County notes: critical step in planning, particularly on clay-heavy or caliche-containing soils common to parts of North Central Texas.
  • Typical cost in Eastland County: $200–$800.

Aerobic Treatment Unit (ATU) Service and Replacement

  • What this service includes: regular ATU maintenance (tank cleaning, diffuser checks, filter changes) and, if needed, a replacement unit.
  • Eastland County notes: ATUs are popular where traditional leach fields are limited by soil restrictions; local service availability affects scheduling and price.
  • Typical cost in Eastland County: service $100–$300 per visit; replacement $2,000–$4,000+ installed.

Grease Trap Pumping (Residential/Small Commercial)

  • What this service includes: pumping and cleaning of grease traps, verifying proper venting and baffling, disposal according to local rules.
  • Eastland County notes: more common with homes that have commercial kitchens or larger hoof lines; not every home will have a trap.
  • Typical cost in Eastland County: $150–$400.

Tank Risers and Lids Installation

  • What this service includes: installing elevated risers and secure, accessible lids for easier future maintenance.
  • Eastland County notes: increases safety and reduces accidental contamination; accessibility is a practical consideration on ranch and rural properties.
  • Typical cost in Eastland County: $500–$1,500.

Emergency Troubleshooting and Backups

  • What this service includes: quick-response diagnostics, camera inspections, and on-site repairs for sewage backups or overflow, often with a 24/7 option.
  • Eastland County notes: rural responses can vary; weather and distance influence availability and pricing.
  • Typical cost in Eastland County: trip charge $100–$300 plus hourly rates; total often $350–$1,000+ depending on complexity.

Official resources:

  • Texas Commission on Environmental Quality (OSSF program and permitting):

Septic vs Sewer Across Eastland County

What "sewer" means in Eastland County

  • In rural parts of Eastland County, municipal sewer service is limited. Many homes rely on their own septic system, while towns and clustered developments may have central sewer. If your property is connected to a municipal sewer, your bills cover sewage treatment and system maintenance; septic pumping isn't your responsibility to manage.
  • Check with your local city utility or Eastland County offices to confirm service availability and any connection requirements.

How septic systems work here

  • A typical septic setup includes a tank that settles solids and a drainfield where liquid effluent percolates through soil. Regular pumping and proper use extend life and prevent backups.
  • Local soil conditions, groundwater, and climate in Eastland County affect system design and performance. A licensed installer and, when required, the state or county health authority oversight help ensure a reliable system.

Pros and cons at a glance

  • Septic systems
    • Pros: Lower monthly costs after installation; independence from municipal schedules.
    • Cons: Requires routine pumping (often every 3–5 years) and careful use to avoid failures; repairs can be costly.
  • Sewer service
    • Pros: No on-site maintenance; predictable bills.
    • Cons: Monthly/quarterly fees; potential hookup or replacement costs if you move or if service changes.

When to choose or stay with septic in Eastland County

  • Remote locations or properties without existing sewer lines.
  • Small households or water-use patterns that keep tank loading manageable.
  • Areas where soil or groundwater conditions favor well-functioning drainfields with proper maintenance.

How to evaluate your current system

  1. Locate the septic tank and drainfield, and note tank size and type.
  2. Confirm last pumping date and typical pumping interval for your household.
  3. Watch for signs of trouble: slow drains, gurgling noises, wet spots in the yard, or odors.
  4. If buying a home or upgrading, arrange a professional septic inspection to assess integrity and compliance.
  5. Verify permit and inspection requirements with local authorities—many jurisdictions require oversight through TCEQ's On-Site Sewage Facilities program.

If you have sewer access or plan to connect

  • Contact your city utility or Eastland County office to determine service availability, connection steps, and any required permits.
  • Expect inspections and possible trench or street-use fees for the hookup.
  • Monthly sewer bills cover treatment and maintenance; your home's drainage patterns and landscaping plans may influence initial connection costs.

Costs snapshot

  • Septic system: installation costs vary widely by lot and design; ongoing costs include periodic pumping and occasional repairs.
  • Sewer connection: one-time hookup costs plus ongoing service fees; long-term budgeting should account for monthly bills and any increases.

Environmental and health considerations

  • Properly functioning septic systems protect groundwater and local waterways; misuse or neglect can lead to contamination and costly repairs.
  • If soil or site conditions in Eastland County are challenging, a professional assessment helps determine the most reliable long-term solution.

Quick reference checklist for Eastland County homeowners

  • Confirm sewer availability for your property.
  • If septic, schedule a baseline inspection and regular pump-outs.
  • Track last pumping date and set reminders for future service.
  • Be mindful of what goes into drains and toilets to protect the drainfield.
  • Verify permits and inspections with TCEQ OSSF program when installing or upgrading.

Official resources

  • Texas Commission on Environmental Quality (OSSF program):
  • U.S. EPA septic systems overview: