Septic in Moreauville, LA

Last updated: Mar 21, 2026

Here in Moreauville, with its warm neighborhood vibe and wide, sunny yards, a solid septic system is often what keeps everyday life running smoothly under the surface. If you're settling in or shopping for a home in this area, you'll notice that on-site wastewater treatment is the common, practical solution that fits rural lots and local infrastructure.

Is septic common in Moreauville? Should I expect septic if I own or buy a home?

Yes. In Moreauville and surrounding rural parts of Avoyelles Parish, most homes rely on septic systems because municipal sewer lines aren't universally available and connecting to a distant sewer main isn't always feasible or affordable. When you own or buy a home here, expect an on-site septic system to be part of the setup. A standard home inspection should include a septic evaluation, and the seller's disclosure should share the system's age, capacity, and any known issues if possible.

Why homes typically use septic systems in Moreauville

There are a few practical reasons this is the norm:

  • Rural lots and spacing mean private wastewater treatment is more practical than laying new sewer mains.
  • Extending city sewer to every property can be costly and slow, so many homeowners rely on individual systems.
  • Local soils and groundwater conditions often work well with well-designed on-site systems, as long as they're properly engineered and maintained.
  • Local regulations require proper design, installation, and ongoing upkeep to protect nearby groundwater and property values.

High-level explanation (why septic exists here)

A typical Moreauville septic setup starts with a buried tank that separates solids from liquids. The clarified liquid then moves to a drain field or absorption area where soils and microorganisms treat it before it re-enters the ground. A well-sized system tailored to the household and lot handles ordinary daily use and local rainfall. Regular pumping and annual inspections help extend the life of the tank and the drain field, which can last several decades if cared for properly. Everything hinges on correct design, proper placement, and sensible maintenance.

Practical tips for homeowners and buyers

  • If you're buying, insist on a septic inspection and ask for pump history and system age.
  • Watch for signs of trouble: slow drains, gurgling sounds, toilets backing up, wet or lush spots over the drain field, or odors.
  • Maintenance matters: plan to pump every 3–5 years for a typical family, conserve water, and limit flushing of grease, wipes, solvents, or chemicals.
  • Know the system layout: locate the access lid and drain-field area, and avoid heavy equipment or deep-rooted trees nearby.

Just a neighbor's note: with the right care, a Moreauville septic system can give you trouble-free service for many years, while you focus on the things you love about this town.

Where Septic Systems Are Common in Moreauville

Map of septic coverage in Moreauville, LA

Where you'll see septic most in Moreauville

  • Within the village limits, some homes are connected to municipal sewer, but many older and rural properties rely on septic systems.
  • Outside the sewer service boundaries, parcels are typically on septic due to the lack of installed sewer lines.
  • In surrounding farms and ranch properties, septic is common because lot sizes and uses favor on-site treatment and drain fields.

Why septic is common here

  • Historical development pattern: Moreauville's footprint includes dispersed, smaller parcels that grew before extensive sewer expansion.
  • Cost and practicality: Extending sewer lines to sparsely populated areas can be expensive, so homeowners rely on on-site systems.
  • Soil and groundwater realities: Avoyelles Parish soils vary; many lots are suited to drain-field systems, while some sites require engineered solutions when soils are slow-draining or water tables are high.

Typical system types you'll encounter

  • Conventional septic tanks with a gravity drain field for well-drained soils.
  • Alternative On-Site Systems (ATU) or aerobic units in areas with slower percolation or higher water tables.
  • Mound systems in poorly drained or shallow soils where traditional drain fields won't function.
  • Small advanced treatment units for lots with space constraints or sensitive soils.

Common site considerations by area

  • Lot size: Many homes sit on parcels split from farms, balancing space for a drain field with other uses.
  • Elevation and drainage: Seasonal waterlogging can require proper grading or raised-bed solutions.
  • Proximity to wells and waterways: Local practice emphasizes adequate separation distances to protect drinking water sources.

Maintenance and monitoring patterns

  • Pumping: Regular pumping every 3-5 years is common, with more frequent service for heavy use or certain waste disposal habits.
  • Landscaping: Plantings over drain fields should be low-root-penetration species to avoid root intrusion.
  • Inspections: Routine inspections help catch leaks or shifts early, especially after heavy rain events.

Step-by-step: How to identify if your Moreauville property uses septic

  1. Check whether your property lies within a municipal sewer service area on the village map or your utility bill.
  2. If you're not on sewer, confirm with the local health department that your property uses a septic system.
  3. Have a licensed septic installer evaluate soil conditions and recommend a system type (conventional, ATU, mound, etc.).
  4. Schedule regular maintenance and keep detailed records of pumping and inspections.

Resources for official guidance

Septic vs Sewer: What Homeowners in Moreauville Should Know

How septic systems and sewer systems work

  • A municipal sewer system channels wastewater from your home to a centralized treatment plant. You pay a sewer bill, and the city or parish handles maintenance and compliance.
  • A septic system sits on your property: wastewater flows from the house into a covered septic tank, where solids settle and liquids move to a drain field for natural filtration. You're responsible for upkeep.
  • Septic systems require space for the drain field and regular inspections, while municipal sewers rely on city planning, underground piping, and treatment facilities.
  • Local conditions in Moreauville, including soil type and water usage, influence which option makes the most sense for a given home.

Which system your Moreauville home likely has

  • Look at your utility bill: a sewer charge usually appears on a monthly or quarterly statement if you're connected to a city or parish system.
  • Check property records or speak with the previous owner or your realtor to confirm the type of system installed.
  • If you're unsure, contact the parish or city public works or the local health department for confirmation. They can verify whether your home ties into a sewer system or relies on a septic tank.
  • Inspect the yard: septic systems have a buried tank and a drain field area that may show markers, while sewer-connected homes typically don't have a visible drain field.

Pros and cons at a glance

  • Sewer (municipal)
    • Pros: Not handling tank pumping or drain-field maintenance; predictable monthly sewer bills; centralized treatment and oversight.
    • Cons: Potential service disruptions during outages or maintenance; ongoing utility charges; you're bound to the system's rules and fees.
  • Septic (onsite)
    • Pros: Independence from a city utility; potential long-term cost savings with proper maintenance; space for a garden or landscape on the drain field.
    • Cons: Regular pumping and inspections required; improper waste disposal can damage the system; repair costs can be substantial if the drain field fails.

Cost and maintenance implications

  • Septic systems: initial installation can be significant, but ongoing costs include periodic pumping (usually every 3–5 years, depending on household size and tank size) and occasional inspections.
  • Municipal sewer: ongoing monthly or quarterly charges; maintenance is generally covered by the utility, but you may face rate increases and service outages.
  • Regardless of type, practices that protect water quality save money: manage water use, recycle graywater where appropriate, and avoid flushing non-biodegradable items or fats, oils, and grease.

How to tell if you're on sewer or septic

  1. Check your most recent water bill for a sewer line item.
  2. Ask your local public works department or parish Health Unit to confirm the system type.
  3. Look for indicators on the property: a visible septic tank lid or a drain field marker suggests a septic system.
  4. If you're selling or buying, request documentation from the seller or buyer's agent about the existing system.

Maintenance basics for septic systems and sewer-adjacent considerations

  • Never flush hazardous chemicals, oils, paints, or medications down the drain; these can damage septic ecosystems and clog lines.
  • Use water efficiently to reduce strain on any system; fix leaks promptly.
  • For septic owners: schedule regular pump-outs and inspections; protect the drain field from heavy equipment, landscaping with deep-rooted trees, and drainage issues.
  • For sewer-connected homes: monitor for sewer backups or slow drains during heavy rainfall; report problems to the utility promptly to avoid damage.

Official resources and where to learn more

  • EPA: Septic system basics and maintenance
  • Louisiana-specific guidance and local regulations
    • https://ldh.la.gov/ (Louisiana Department of Health – Environmental Health resources and local health units)
  • Local contacts for Moreauville
    • Check with Moreauville's parish public works or health department for system-specific requirements and records.

Typical Septic System Types in Moreauville

Conventional gravity-fed septic systems

  • How it works: A buried septic tank holds solids while bacteria break them down. Clearer liquid exits into a soil absorption field through perforated pipes.
  • Components: septic tank (typical residential sizes), distribution box, perforated pipes, gravel or aggregate, and soil.
  • When it's a fit: solid waste is manageable with adequate soil depth and good groundwater separation.
  • Pros and cons: simple, dependable, lower upfront cost; performance hinges on regular pumping and proper waste disposal.
  • Maintenance notes: pump every 3–5 years (or per local pro's recommendation); conserve water, avoid flushing bulky items, and keep fats/oils out of drains.

Mound systems

  • Why they're used: in Moreauville, if the native soil is shallow, high water table is present, or percolation is poor.
  • How it works: an elevated infiltrative bed sits on top of engineered fill. Wastewater is pumped to the mound, then trickles down through the soil.
  • Pros and cons: effective on challenging soils; higher upfront cost and more ongoing maintenance than a conventional system.
  • Maintenance tips: inspections and pumping schedule still matter; ensure the crown of the mound remains intact and avoid heavy machinery over the area.

Aerobic treatment units (ATU) and other advanced systems

  • How they work: mechanical aeration and secondary treatment create clearer effluent with fewer pathogens. Discharge often goes to a drain field or spray irrigation.
  • When to consider: good option where soils are poor, space is limited, or stricter water quality is required.
  • Pros and cons: stronger treatment in limited soil conditions; higher energy use and higher maintenance costs.
  • Practical notes: most systems require a service contract and annual inspections; keep records of service and any alarms or failures.

Sand filters and evapotranspiration (ET) beds

  • How they work: effluent is treated through a sand-based filtration layer (or ET bed) before entering the soil.
  • Ideal conditions: useful when soil dispersal is limited or when site-specific design calls for enhanced filtration.
  • Pros and cons: compact footprint and reliable treatment; sand eventually scales with time and may need occasional replacement.
  • Maintenance tips: prevent clogging from waste buildup; have a pro assess and service per schedule.

Drip irrigation and alternative disposal options

  • What this looks like: treated effluent is distributed through drip lines for landscape irrigation or other onsite uses, often paired with an ATU or other treatment step.
  • Who uses it: more common in larger lots or when local codes authorize landscape reuse.
  • Pros and cons: water-efficient and can serve irrigation needs; requires careful design, installation, and monitoring to stay code-compliant.
  • Practical note: ensure any reuse aligns with local regulations and irrigation setbacks.

Steps to help you judge what might work on your Moreauville lot

  1. Assess soil quality and groundwater depth with a local soil test or percolation test.
  2. Map your lot's setbacks (property lines, wells, streams) and drainage patterns.
  3. Talk with a licensed septic designer about site-specific options (conventional, mound, ATU, or sand/ET bed).
  4. Check local codes and permit requirements through official channels.

Official resources

Common Septic Issues in Moreauville

Soil and groundwater challenges in Moreauville

Moreauville sits in Avoyelles Parish where clay soils and a seasonal high water table are common. When rains are heavy or groundwater is near the surface, the drain field has less ability to absorb effluent, which increases the risk of surface dampness or odors.

  • Symptoms: slow flushing, gurgling sounds, wet spots or spongy ground over the drain field, and occasional sewage odors near the system.
  • Why it happens here: clay soil, fluctuating water tables, and occasional flooding reduce percolation and treatment capacity.
  • What to do:
    1. Have a licensed septic contractor assess soil conditions and system design.
    2. If the site is chronically wet, consider a design alternative (e.g., mound or sand absorption) suitable for wet soils.
    3. Avoid driving or building over the drain field to prevent compaction.
  • Resource: EPA septic systems: https://www.epa.gov/septic

Drain field stress and failure in Moreauville

Drain fields can fail when the soil cannot absorb effluent due to saturation, root intrusion, or overloading from wastewater.

  • Signs to watch: damp, green grass over the field; new surface wet spots; persistent odors; slow drains.
  • Local factors: sustained rainfall, high water table, and nearby root systems increase failure risk.
  • Recovery steps:
    1. Get a professional evaluation to determine repair versus replacement.
    2. Reduce daily load: spread laundry over several days; fix running toilets; limit garbage disposal use.
    3. If replacement is needed, choose a field design suited to wet soils and local conditions.
  • Resource: EPA septic systems: https://www.epa.gov/septic

Water use patterns that strain septic systems

Excessive or poorly timed water input accelerates backup and reduces treatment effectiveness.

  • Smart habits:
    • Stagger laundry and dishwashing; avoid long, consecutive showers.
    • Use high-efficiency appliances and fixtures.
    • Flush only septic-safe items; avoid wipes, grease, and harsh chemicals.
  • Quick plan:
    1. Estimate daily water use and aim for a modest per-person target.
    2. Install low-flow fixtures and energy-efficient devices.
    3. Schedule an annual system check to adjust usage and address any issues.
  • Resource: LSU AgCenter water efficiency tips: https://www.lsuagcenter.com/

Root intrusion and landscaping around the system

Tree and shrub roots can invade pipes and the drain field, causing backups and reduced performance.

  • What to look for: sudden backups after rain, wet spots away from drainage, or new odors.
  • Prevention:
    • Keep vegetation away from the septic area; maintain a clean buffer.
    • Consider root barriers if nearby trees must stay.
    • Limit heavy equipment over the field to prevent soil disturbance.
  • Steps:
    1. Have the system located by a professional.
    2. Prune or relocate obstructive roots; replace with non-invasive species if needed.
    3. Monitor soil moisture and address dampness promptly.
  • Resource: EPA septic systems: https://www.epa.gov/septic

Flooding and storm impacts in Avoyelles Parish

Heavy rains and floods can saturate soils around the disposal area, increasing the chance of surface effluent or backups.

  • Mitigation basics:
    • Grade and divert surface water away from the tank and field.
    • Do not discharge floodwater into the septic system.
    • After floods, limit new wastewater input until the system is inspected and soils dry.
  • Steps:
    1. When waters recede, have a licensed contractor inspect for damage.
    2. If the field shows damage, plan repairs promptly with professional guidance.
  • Resource: EPA septic systems: https://www.epa.gov/septic
  • Official resources:

Septic Inspection, Permits & Local Oversight

Local oversight in Moreauville, LA

In Moreauville (Avoyelles Parish), septic systems are overseen through a combination of parish-level offices and state health guidance. A typical pathway is: the parish health unit or parish building department handles permits and inspections, while the Louisiana Department of Health provides statewide guidance. Always verify requirements with your local office before starting work.

Permit types you may encounter

  • New system installation: a formal permit is required before any digging or installation begins.
  • System replacement or major modification: permits are typically needed if the leach field or tank design changes.
  • Repairs affecting the system: some repairs require a permit if they alter the system layout or size.
  • Routine maintenance (pumping, cleaning) and minor servicing: usually do not require a permit, but keep records in case the local authority requests them.

How to apply for a permit (step-by-step)

  1. Contact the Avoyelles Parish Health Unit or the parish building department to confirm current permit requirements.
  2. Prepare site information: parcel map, existing sewage layout, and any proposed design plans.
  3. Submit a permit application with all required documents and fees; include soil evaluations or perc tests if requested.
  4. Schedule any required soil tests, drilling inspections, or on-site reviews as part of the permit process.
  5. Receive permit approval, follow any posting instructions, and schedule inspections as required.

What inspectors look for during inspections

  • Access and safety: clear access for equipment and personnel; safe excavation boundaries.
  • System design and components: correct tank size, baffles, aeration or dosing if applicable, and proper leach-field layout.
  • Distances and setbacks: compliance with setbacks from wells, streams, property lines, and structures.
  • Materials and workmanship: proper sealing, installed fittings, backfill methods, and adherence to manufacturer specs.
  • Final readiness: system tested and functional, with all records completed and on-site as directed.

Maintenance records and property transfers

  • Keep service records, pumping receipts, and maintenance notes for at least 3–5 years (local rules may vary).
  • If you're selling, have ready any permit paperwork and current status reports the buyer or lender may require.
  • Establish a routine maintenance schedule (pump every 3–5 years for typical residential systems, or per local guidance) and log it.

Quick practical tips

  • Always verify permit requirements before starting work; even small changes can trigger a permit need.
  • If you're unsure which office handles septic permits in your area, start with the Avoyelles Parish Government's Building & Permits pages or contact the parish health unit.
  • Save every receipt and inspection note; they can help resolve questions with buyers, lenders, or future inspectors.

Official resources

  • Louisiana Department of Health (Environmental Health):

Septic Maintenance for Homes in Moreauville

Local conditions in Moreauville that affect septic systems

Moreauville sits in a region with clay soils, a relatively high water table, and a propensity for heavy rainfall and occasional flooding. These factors can slow effluent percolation and raise the risk of drainfield saturation, backups, and surface seepage after storms. Tree roots are common near older homes and can intrude on septic piping and baffles, disrupting flow and increasing maintenance needs. Understanding these local conditions helps you plan proactive care rather than reactive fixes.

Typical maintenance schedule for Moreauville homes

  • Pumping interval: For a standard 1,000–1,500 gallon residential tank with average usage, plan to pump every 2–3 years. If your household uses a garbage disposal heavily, or if you have a larger family or frequent guests, more frequent pumping (every 1–2 years) may be prudent. If you're a smaller household with conservative wastewater use, 3–4 years can be realistic, but have your system inspected regularly.
  • Annual inspections: Have a licensed septic professional inspect the tank and, if present, the effluent filter and the drainfield. They should verify baffles are intact, check for signs of leakage, and confirm the drainfield's general condition.
  • Monitor performance: Regularly observe drains, toilets, and sump systems for hints of trouble (slow drains, gurgling sounds, or sudden odors) between professional visits.

Steps you can take:

  1. Confirm your tank size and occupancy with a licensed pro to tailor pumping intervals.
  2. Schedule a pumping and inspection with a local septic contractor familiar with Avoyelles Parish soils and climate.
  3. Keep a simple maintenance log (pump dates, service notes, any repairs).
  4. Avoid DIY drain cleaning products and never pour solvents or oils down drains.

Drainfield care in clay soils and high water table

  • Protect the drainfield area: Do not drive or park on the drainfield. Roots, especially from mature trees, can damage pipes and reduce absorption.
  • Space and plant wisely: Install or maintain a vegetation plan that minimizes root intrusion. Avoid planting trees or large shrubs with aggressive roots over or near the drainfield; keep away from the leach field by at least 10–15 feet if possible.
  • Soil and compaction: Do not compact the soil above the drainfield. Heavy equipment, including landscaping gear, should be kept off the area.
  • Drainfield design options: In areas with high water tables or poorly draining soils, a mound system or alternative drainfield may be recommended by a professional. These systems are designed to manage seasonal saturation and improve effluent distribution.
  • Filter and outlet protection: If your system has an effluent filter, have it inspected and cleaned as needed to prevent premature clogging of the system.

After heavy rain or flooding

  • Reduce usage after storms: Limit water use for 24–48 hours after heavy rainfall to prevent overloading a saturated drainfield.
  • Inspect for surface indicators: Look for greener, soggy patches above the drainfield, gurgling inside fixtures, or backups—these can signal saturation or failure.
  • Sump pump disposal: Do not discharge sump pump water into the septic system. Redirect sump discharges away from the septic area to prevent overloading the drainfield during flood-prone periods.
  • Post-storm checks: If you've experienced flooding, have a licensed professional inspect for structural damage, scoured trenches, or compromised baffles before resuming normal wastewater use.

Seasonal maintenance checklist

  • Spring: Schedule a service visit; inspect drainfield surface; verify vegetation and rooting plan.
  • Summer: Watch for odors or damp spots after heavy storms; avoid adding large amounts of water via a pool or hot tub bills.
  • Fall: Reassess tree placement and root risk; trim roots near the system; prepare for wet season by confirming access to the lid and tank.
  • Winter: Ensure pipes inside are protected against freezing; keep vent and access points clear of snow and ice.

Signs of trouble and what to do

  • Persistent gurgling, toilets or sinks backing up, or wet, lush patches above the drainfield.
  • Strong odors near the septic tank or drainfield.
  • Frequent pump cycles or standing water in the drain area.
  • What to do: Contact a licensed septic professional promptly. Do not attempt to DIY repairs beyond basic maintenance.

Useful resources

Cost Expectations for Septic Services in Moreauville

Septic Tank Pumping

  • What it includes: removing accumulated solids from the tank, checking sludge and scum layers, ensuring pump-out disposal is handled properly, and resealing lids. In Moreauville, access often affects time and price due to driveways, gates, and remote locations.
  • Moreauville specifics: clay soils and a fair number of older systems mean solids can accumulate unevenly; seasonal water table changes can affect pumping frequency.
  • Typical cost in Moreauville: roughly $250–$450 for a standard 1,000-gallon tank. Larger tanks, limited access, or difficult terrain can push costs higher.
  • Preparation tips (steps):
    1. Locate and expose the tank lids ahead of the visit.
    2. Clear a path for the truck and allow space for equipment.
    3. Keep pets and children away from work area on pump day.
  • Learn more: https://www.epa.gov/septic

Septic System Inspection

  • What it includes: visual inspection of tank condition, baffles, distribution box, and leach field; check for odors, wet areas, and efficient drainage; may include a pump or flow test.
  • Moreauville specifics: soil and groundwater conditions can mask early warning signs; a full inspection is wise when buying or selling, or after unusual drainage issues.
  • Typical cost in Moreauville: $150–$300 for a standard inspection; $250–$400 if a camera inspection is included.
  • Quick-read steps: 1) schedule with access instructions, 2) point out any known problem areas, 3) receive a written report with recommendations.
  • Learn more: https://www.epa.gov/septic

Camera Inspection (Video Inspection)

  • What it includes: high-definition video of interior tank conditions, piping, and the drain field; helps pinpoint cracks, collapsed lines, or obstructions.
  • Moreauville specifics: camera inspections are especially valuable when the soil is heavy and the drainage area is hard to assess by sight alone.
  • Typical cost in Moreauville: $250–$450 depending on access and scope.
  • Steps to prepare: 1) ensure nearby access to all manholes, 2) note any known odors or surfacing issues, 3) review video with the technician.
  • Learn more: https://www.epa.gov/septic

Drain Field Evaluation and Repair

  • What it includes: soil absorption tests, inspection of lateral lines, distribution box, and trench condition; repair options may include trench cleaning, repair of failures, or partial replacement.
  • Moreauville specifics: heavy clay and perched groundwater can cause quicker field failures or require upgraded designs (such as a mound or ATU) to meet code.
  • Typical cost in Moreauville: repairs often range $6,000–$18,000; full drain field replacement can run $10,000–$25,000 or more, particularly with site work needs.
  • Steps to plan: 1) verify system age and performance history, 2) obtain a soil and field evaluation, 3) review design options with your installer.
  • Learn more: https://www.epa.gov/septic

New System Installation (Conventional, Mound, ATU)

  • What it includes: site assessment, design, permits, trenching or mound installation, soil remediation, and final startup testing.
  • Moreauville specifics: due to soil limitations and water table considerations, many new systems in this area are mound or aerobic treatment unit (ATU) designs.
  • Typical cost in Moreauville: conventional systems often start around $5,000–$15,000; mound or ATU systems commonly run $15,000–$40,000, with higher-end site work or custom designs exceeding that range.
  • Steps to get started: 1) choose a qualified designer, 2) secure required permits, 3) schedule installation windows around weather and flooding considerations.
  • Learn more: https://www.epa.gov/septic

Perc Test / Soil Evaluation

  • What it includes: soil percolation testing to determine absorption capacity and suitable system type; soil borings may be performed to assess depth to groundwater and the presence of restrictive layers.
  • Moreauville specifics: Avoyelles Parish soils often require careful evaluation to select a compliant system, especially where clay or perched water exists.
  • Typical cost in Moreauville: approximately $1,200–$2,500 depending on property size and testing scope.
  • Steps: 1) arrange access and scheduling, 2) perform tests, 3) review results with installer and approve design.
  • Learn more: https://www.epa.gov/septic

System Maintenance Plans (Ongoing)

  • What it includes: routine pumping at recommended intervals, annual inspections, minor repairs, and priority scheduling for emergencies.
  • Moreauville specifics: rural properties and aging systems benefit from a maintenance plan due to access challenges and variable usage.
  • Typical cost in Moreauville: $150–$300 per year for a standard plan; additional service fees may apply for after-hours visits or urgent calls.
  • Steps to enroll: 1) pick a plan level, 2) set a pumping calendar, 3) keep service records available for future inspections.
  • Learn more: https://www.epa.gov/septic

Grease Trap Pumping (Residential or Small Commercial)

  • What it includes: pumping and disposal of grease interceptor contents; inspection for blockages and odors; resealing after service.
  • Moreauville specifics: some older homes with large kitchen loads or small commercial properties may have grease traps connected to septic systems.
  • Typical cost in Moreauville: $150–$350 per service, depending on trap size and accessibility.
  • Steps: 1) locate the trap, 2) ensure area is accessible for the truck, 3) avoid introducing non-biodegradable items into the trap.
  • Learn more: https://www.epa.gov/septic

Official resources