Septic in Scott County, IA

Last updated: Mar 21, 2026

Scott County greets you with river views, bike trails, and neighborhoods growing faster than ever. Here, you'll find a mix of historic homes on quiet country lanes and newer subdivisions close to the Quad Cities. For many of us, a septic system feels as familiar as the seasons—a practical, on-site way to manage household wastewater with care and reliability.

Is septic common in Scott County? Should I expect septic if I own or buy a home? The short answer is yes—septic systems are a common sight, especially in rural pockets and in subdivisions not yet served by a city sewer. If your property isn't connected to a municipal line, you're likely on a septic system. When you're buying, ask for the septic permit map, the last tank service date, and a recent inspection report. If there's no sewer map handy, plan for a professional septic evaluation before closing.

  • Confirm whether public sewer serves the property
  • Obtain a recent tank pumping or service record
  • Schedule a licensed, qualified septic inspection

Why do homes here use septic? Extending sewer lines through rural land or older neighborhoods can be costly and disruptive. Many parcels in Scott County are best served by on-site treatment that works with Iowa soils. Modern septic systems, including aerobic and mound options, offer reliable performance when properly designed, installed, and maintained.

County growth history and how that has impacted septic coverage. Scott County's growth mirrors the broader Quad Cities expansion: residential development around Davenport, Bettendorf, Eldridge, and surrounding towns, plus new commercial corridors along interstates. That growth has meant more properties with public sewer, but also large areas where sewer access remains limited. As infrastructure expands, some properties convert to municipal service; others stay on septic with regular maintenance. The result is a county with a wide range of systems—from older gravity drain fields to newer pressure-dosed or mound systems—each requiring care to perform well.

High-level explanation (why septic exists here). On-site septic exists here because it's a practical, locally appropriate solution when sewer mains don't reach, and because many soils in the county can support a well-designed system. A properly sized, correctly installed septic system treats wastewater close to where it's produced, protects groundwater and streams, and keeps homes functioning smoothly through changing development patterns. With the right maintenance, your system can last for decades. Read on for practical steps you can take today to care for your system here in Scott County.

How Septic Is Regulated in Scott County

Who regulates septic systems in Scott County

  • Septic systems in Scott County are overseen by both state and county authorities. The Iowa Department of Natural Resources (DNR) sets statewide standards for on-site wastewater systems, while Scott County Environmental Health administers local permits, inspections, and record-keeping for systems within the county.
  • Local rules and state requirements work together to protect drinking water, soils, and long-term property health. Homeowners and professionals must follow these rules to install, repair, or maintain a system legally and safely.

Permits, design, and inspections

  • Step 1: Determine permit needs
    • Contact Scott County Environmental Health to confirm whether you need a permit for a new system, a replacement, or a major repair.
  • Step 2: Planning and design
    • A site evaluation is typically required. Plans are often prepared by a licensed designer or engineer and must meet state and county standards.
    • The state's On-Site Wastewater guidelines guide design, materials, and setback requirements.
  • Step 3: Permit approval
    • Submit plans to the county for review. A permit is issued only after the design meets all requirements.
  • Step 4: Installation and inspections
    • Installations are inspected by county environmental health staff at key milestones to verify proper placement, materials, and installation methods.
  • Step 5: Final inspection and records
    • A final inspection confirms the system is operating as designed. An as-built or record drawing may be required and kept on file with the county.

Ongoing maintenance and records

  • Homeowner responsibilities
    • Regular maintenance is essential. Pumping intervals depend on tank size and usage but are commonly every 3–5 years; keep receipts and documentation of pumpouts.
  • Record-keeping
    • The county maintains records of installed systems, inspections, and major repairs. Keeping copies of permits, inspections, pumpouts, and any corrective actions helps with future real estate transactions and compliance.

What to expect if you have a problem

  • Common issues
    • Systems that are overloaded, failed components, or improper maintenance can lead to backups, pooling, or soil saturation.
  • Enforcement and remedies
    • If a system isn't functioning properly or doesn't meet permit conditions, the Scott County Environmental Health department can issue notices and require corrective action, up to and including system replacement in severe cases.
  • Filing a concern
    • If you notice signs of a malfunction, contact Scott County Environmental Health to file a complaint or request an inspection.

Start here: getting permits and help

  1. Call or visit the Scott County Public Health – Environmental Health page to determine permit requirements and next steps.
  2. Hire a licensed designer/installer as required by state and county rules.
  3. Submit plans for review and obtain a permit before starting work.
  4. Schedule inspections during construction and after completion.
  5. Official resources:
    • Scott County Public Health – Environmental Health:
    • Iowa DNR On-Site Wastewater Systems:

Soil, Groundwater & Environmental Factors in Scott County

Local soil characteristics in Scott County

Scott County sits on a mix of soils that influence septic performance. Expect a range from well-drained loess-derived silty loams to compacted or clayey layers near floodplains. Infiltration can vary widely from parcel to parcel, so a one-size-fits-all approach won't work.

  • Soil drainage matters: good drainage supports leach fields, while slow-draining soils may require specialty designs.
  • Depth to restrictive layers: some spots have shallow bedrock or dense layers that limit effluent movement; a percolation test will reveal specifics.
  • Use the NRCS Soil Survey for local details:
  • U.S. EPA – Septic Systems: https://www.epa.gov/septic
  • NRCS Web Soil Survey: https://websoilsurvey.nrcs.usda.gov/

Typical Septic System Types in Scott County

Conventional gravity septic systems

Most homes in Scott County rely on conventional gravity systems: a septic tank, followed by a soil absorption field (drain field). The drain field relies on the soil to treat and disperse effluent. When soils are permeable enough and groundwater is at a safe depth, this setup works reliably with minimal maintenance.

  • Pros: simple design, widely understood, fewer moving parts.
  • Cons: performance can degrade if the soil is too dense, groundwater is high, or the tank isn't pumped regularly.
  • Typical components: septic tank, distribution lines, perforated laterals, and unsaturated soil above the drain field.

Maintenance steps:

  1. Have the tank pumped by a licensed contractor every 3–5 years based on usage and household size.
  2. Conserve water to reduce load on the system (spread out laundry and dishwasher use).
  3. Use septic-safe cleaning products and avoid putting fats, oils, solvents, or nonbiodegradable items down drains.
  4. Schedule regular inspections if you notice slow drains, gurgling, wet spots, or surface reveals.

Mound systems

Mound systems are common in areas with shallow soil, high water tables, or poor natural drainage. They place a sand-filled mound above the native soil, housing the drain lines so effluent can be treated in a larger, aerobic zone before reaching the groundwater.

  • Pros: suitable for challenging soils, higher treatment capacity in restricted areas.
  • Cons: more complex and costly to install; require careful maintenance and surface protection.
  • Typical components: septic tank, dosing chamber, sand/soil fill, gravel, and perforated distribution lines within the mound.

Maintenance steps:

  1. Avoid foot traffic and heavy equipment on the mound; keep vegetation shallow and non-invasive.
  2. Watch for ponding, swelling, or settling on or near the mound surface.
  3. Pump the tank on a regular cycle and keep records of service dates.
  4. Have the system inspected after severe weather or flooding to check for disruptions in dosing.

Sand filter systems

Sand filter systems use a manufactured filter bed to polish and treat effluent before it enters the soil. They're often used where soil conditions limit conventional absorption fields.

  • Pros: improved effluent quality in poor soils; effective even with marginal drainage.
  • Cons: require ongoing maintenance, filter media management, and regular inspections.
  • Typical components: septic tank, dosing/return lines, and a sand filter bed with a controlled effluent outlet.

Maintenance steps:

  1. Schedule annual inspections with a licensed service provider.
  2. Ensure dosing pumps and valves operate correctly; correct any leaks or clogs promptly.
  3. Have the septic tank pumped on a schedule to prevent solids buildup that could clog the filter.
  4. Keep roots and heavy equipment away from the filter bed.

Aerobic treatment units (ATU)

ATUs provide a higher level of treatment by introducing air to the wastewater, producing a clearer effluent. They're used when soils are less forgiving or where a shorter system footprint is needed. ATUs require electricity and regular service to maintain performance.

  • Pros: higher effluent quality, can allow for shared or smaller drain fields.
  • Cons: higher upfront cost and ongoing electrical/maintenance needs.
  • Typical components: aerator/blower, clarifier, a disinfection step, and a drain field or alternative final treatment.

Maintenance steps:

  1. Hire a licensed operator for quarterly or semiannual service as required.
  2. Monitor electrical components and clean or replace air filters as recommended.
  3. Pump the tank per the service plan and check alarms or indicators.
  4. Avoid flushing harsh chemicals or nonbiodegradable items that can harm the biological treatment process.

Pressure distribution and chamber systems

These approaches optimize how effluent is dispersed in the drain field. Pressure-dosed systems use a small pump to evenly distribute effluent, while chamber systems replace gravel with plastic chambers to reduce soil compaction and improve infiltration.

  • Pros: more uniform distribution, often easier to install in restricted soils; chamber systems reduce weight and allow faster installation.
  • Cons: still require regular pumping and inspection; some components can be sensitive to power interruptions.
  • Typical components: pump chamber, control valve, distribution lines, and modular drainage chambers.

Maintenance steps:

  1. Confirm proper pump operation and cycling with a licensed technician.
  2. Inspect control valves and alarms; test the system's response during testing.
  3. Pump and inspect tanks on schedule; monitor for wet spots or surface issues in the drain field.
  4. Keep heavy equipment off the drain field and avoid planting deep-rooted trees nearby.

Official resources:

  • Iowa Department of Natural Resources: Onsite Wastewater (OWTS) information and requirements

  • U.S. Environmental Protection Agency: Septic Systems overview

Typical Septic Issues Across Scott County

Drain-field saturation and failure

In Scott County, soil conditions and seasonal moisture can push drain fields to the edge. A saturated field won't absorb wastewater properly, leading to odors, pooled water, and backups inside the home.

  • Signs to watch for:
    • Wet, soggy spots or sewage odors near the drain field
    • Lush, unusually green grass or staining on soil above the field
    • Slow draining sinks and toilets, or sewage backing up into fixtures
  • Common causes:
    • Excessive water use (large loads of laundry, long showers) dumps more water into the system than the soil can handle
    • Tree roots invading the drainage area
    • A failing or undersized drain field from original installation
    • Compacted soil or a shallow system
  • What to do:
    1. Stop heavy water use and spread out laundry and dishwashing
    2. Schedule a licensed septic contractor assessment of the tank and field
    3. Consider pumping out the tank if buildup contributes to saturating the field
    4. Address field repair or replacement as advised by a pro
  • Official resources:
    • EPA septic systems:

Tank problems and baffle or structural issues

Older tanks can crack, corrode, or fail, allowing solids or scum to escape and clog the outlet. Faulty baffles or leaking tanks are a red flag for drainage problems.

  • Signs to watch:
    • Foul odor near the tank or vent pipe
    • Damp soil near the septic tank or buried access lids
    • Unusual backups or gurgling sounds in plumbing
  • Common causes:
    • Age and wear of concrete, fiberglass, or plastic tanks
    • Improper pumping leading to heavy solids buildup
    • Outlet or inlet baffle damage allowing solids to pass through
  • What to do:
    1. Have a licensed pro inspect the tank, baffles, and effluent piping
    2. Pump out the tank if solids are high or if instructed by the pro
    3. Repair or replace damaged components or the tank as needed
  • Official resources:

Septic Inspection, Permits & Local Oversight

Local oversight in Scott County

Scott County relies on the county Environmental Health team, with support from the Iowa Department of Natural Resources (DNR) for wastewater rules. Permits and inspections help ensure septic systems are designed, installed, and maintained to protect the public health and the local waterways. You'll typically work through the Scott County Health Department or the county planning/permitting office to pull the necessary approvals. Official resources:

  • Scott County Health Department (Environmental Health) —
  • Iowa Department of Natural Resources — Sewage Systems (official state guidance) —

When a septic permit is required

A permit is usually needed for any new system, substantial replacement, or changes to an existing system. Common situations:

  • New home construction with a septic system
  • Replacing or upgrading a septic tank, drain field, or pumps
  • Replacing a failed system due to soil or performance issues
  • Expanding a house or changing the wastewater load (e.g., added bathrooms, fixtures)
  • Relocating a system or performing major repairs

If you're buying or selling a property, a transfer of ownership may trigger permit review or as-built documentation.

The permit process (step-by-step)

  1. Determine permit necessity
  2. Collect required documents (site plan, septic design, drainage data, parcel information)
  3. Submit the application to Scott County Environmental Health or the county permitting office
  4. Pay applicable fees (permit, inspection, and any additional reviews)
  5. Schedule soils evaluation, design review, and system inspection as needed
  6. Install by a licensed septic contractor under approved plans
  7. Complete final inspection and submit as-built documentation

Tip: Double-check whether you must obtain a separate grading or drainage permit in addition to the septic permit.

What inspectors look for during a septic inspection

  • Proper setback distances from wells, buildings, and property lines
  • Adequate tank integrity, baffles, and pump chamber (if present)
  • Proper tank placement, access risers, and lid safety
  • Correct drain field design, soil treatment area, and to-grade coverage
  • Soil absorption characteristics and drain field depth
  • Compliance with design specifications and approved drawings
  • Functional systems for pump stations, alarms, and effluent distribution (if applicable)
  • Clear identification of system components and as-built records

Prep tips:

  • Make access easy for inspectors (clear paths to tanks and leach fields)
  • Have records ready: old permits, system diagrams, maintenance history
  • Ensure utilities or landscaping won't disrupt the inspection

Transfers, remodels, and ongoing maintenance

  • For real estate transactions, ensure the seller provides the latest permit and as-built drawings
  • If you're remodeling, verify whether the project alters wastewater loads and whether an updated permit is required
  • Regular maintenance (pumping, cleaning, and inspections) should be documented for compliance and future transfers

Fees, timelines, and getting answers

  • Permit and inspection fees vary by project size and scope; timelines depend on staff workloads and scope (new systems often take longer than minor repairs)
  • Typical review and inspection windows can range from a couple of weeks to a few months for complex systems
  • Contact the Scott County Health Department or Planning & Development office early to confirm exact deadlines and required documents
  • Official resources:

What to expect in the final steps

  • A completed permit record and approved system design
  • On-site installation by a licensed septic contractor under approved plans
  • Final inspection and submission of as-built documentation to close the permit
  • Confirmation that the system complies with county and state wastewater standards

Resources and contacts

Cost Expectations for Septic Services in Scott County

Septic Tank Pumping

  • What it includes: removing the contents of the septic tank, measuring the sludge and scum layers, inspecting tank baffles and lids, and cleaning up the site. Most pumps include a basic evaluation of the tank condition and a written charge for disposal.
  • Scott County specifics: homes with higher occupancy or frequent use tend to need pumping every 2–3 years; older systems or tanks with smaller capacity may require more frequent service. Local inspectors often look for proper tank access and safe disposal practices in line with county rules.
  • Typical cost: about $275–$550 for a standard 1,000–1,500 gallon tank; larger tanks or difficult access can push toward $600–$700.
  • Learn more:

System Design and Installation (new systems or replacements)

  • What it includes: site evaluation, soil testing (percolation tests and soil surveys), system design (conventional, mound, drip, or alternate absorption methods), permit coordination, and installation by licensed contractors.
  • Scott County specifics: soils in parts of the county may require mound systems or advanced designs; local permitting through Scott County Environmental Health is typically needed before installation.
  • Typical cost: $8,000–$25,000+, with complex or mound systems at the higher end.
  • Learn more:

Drain Field Repair and Replacement

  • What it includes: evaluation of failed absorption area, repair of trenches or laterals, replacement of crushed gravel or piping as needed, and restoration of the approved absorption area.
  • Scott County specifics: a common issue in clay soils or high-water-table areas; replacements may involve deeper trenches, raised mounds, or alternative absorption methods.
  • Typical cost: $3,000–$10,000 for targeted repairs; full replacement or redesign can run $6,000–$20,000+.
  • Learn more: https://www.epa.gov/septic

Tank Replacement and Decommissioning

  • What it includes: removal and proper disposal or recycling of an old tank, excavation, installation of a new tank, and re-sealing access points; decommissioning may be required when abandoning an outdated system.
  • Scott County specifics: if replacing an older tank, expect coordination with county records and proper permitting; ensure the new tank meets current code requirements.
  • Typical cost: $2,500–$6,000 for the tank itself plus related excavation and backfill; total project may exceed $8,000 with site prep.
  • Learn more: https://www.iowadnr.gov/Environmental-Protection/Water-Quality/Onsite-Wastewater-Systems

Repairs to Components (pumps, alarms, baffles, filters)

  • What it includes: replacing a failing effluent pump, repairing or replacing a damaged baffle, swapping out an alarm, or cleaning/repairing filters.
  • Scott County specifics: some repairs require access to sealed chambers; local codes may dictate components able to be used in high-water-table zones.
  • Typical cost: $300–$1,800 depending on part and labor; emergency or after-hours repairs can add a premium.
  • Learn more: https://www.epa.gov/septic

Routine Maintenance Plans (scheduled pumping, inspections, and inspections)

  • What it includes: annual or biannual pumping, periodic inspections, and a written maintenance schedule; some plans bundle diagnostics with priority service.
  • Scott County specifics: regular maintenance is encouraged to extend system life, particularly in areas with soils prone to high moisture or seasonally high water tables.
  • Typical cost: $100–$250 per service visit; annual plans often $300–$500 total.
  • Learn more: https://www.iowadnr.gov/Environmental-Protection/Water-Quality/Onsite-Wastewater-Systems

Permitting, Inspections, and Code Compliance

  • What it includes: permit application, plan review, on-site inspections, and final approvals as required by Scott County and state regulations.
  • Scott County specifics: permit fees and inspection timelines vary; plan ahead to align with construction or transfer schedules.
  • Typical cost: permit fees often in the $150–$400 range, plus inspection fees as applicable.
  • Learn more: https://www.scottcountyiowa.gov/health

Emergency Septic Service (after-hours or urgent issues)

  • What it includes: rapid dispatch for septic failures, clogged lines, or standing water; diagnostic assessment and prioritized scheduling.
  • Scott County specifics: during outages or wet seasons, emergency calls are common; expect a higher call-out fee and after-hours rates.
  • Typical cost: $150–$200 call-out fee, plus labor and parts for the fix.

Official resources

Cities & Communities in Scott County With Septic Systems

Donahue

Donahue and surrounding rural areas in eastern Scott County often rely on onsite septic systems where sewer service isn't available to every parcel. If you live here, your system may be a central part of property maintenance and land use planning.

  • Typical maintenance tips:
    • Schedule regular inspections and pumping every 3–5 years, or as recommended by a licensed professional.
    • Use water efficiently to reduce wastewater load.
    • Keep stormwater and surface runoff away from the septic area.
    • Avoid flushing non-biodegradable items, chemicals, or grease down drains.
  • If you're buying a home with a septic system:
    1. Get a certified septic inspection.
    2. Identify tank location and age.
    3. Check the drain field's condition and any surface evidence of failure.
    4. Verify local approvals for any repairs or changes.
    5. Review maintenance records and red flags with the seller.
  • Official resources:
    • Scott County Health Department:
    • Iowa Department of Natural Resources – Onsite Wastewater:

Long Grove

Long Grove is a smaller community within Scott County where septic systems remain common outside the main public sewer corridors. Homeowners here often balance rural land use with environmental safeguards.

  • Typical maintenance tips:
    • Pump on a regular schedule and keep a service log.
    • Protect the area with vegetation to minimize soil compaction over the leach field.
    • Do not park vehicles or heavy equipment on the septic system.
    • Use a garbage disposal sparingly or avoid it, to cut down solids.
  • If you're buying a home with a septic system:
    1. Confirm tank size and age.
    2. Check for drainage issues or damp spots near the drain field.
    3. Review past maintenance and any repairs.
    4. Have a licensed inspector assess the system's performance.
    5. Ensure local permits were obtained for any work.
  • Official resources:

Walcott

Walcott and neighboring rural pockets rely on septic in areas not served by the municipal sewer system. Residents should stay aware of seasonal groundwater changes and system upkeep.

  • Typical maintenance tips:
    • Regular pumping and inspection aligned to the system's age.
    • Keep the drainage area clear of trees and heavy roots.
    • Direct downspouts away from the septic area; manage lawn irrigation.
    • Use septic-safe products and avoid chemical drain cleaners.
  • If you're buying a home with a septic system:
    1. Obtain a current septic tank and drain field evaluation.
    2. Check for signs of failure (gurgling sounds, odors, lush green patches).
    3. Review maintenance history with the seller.
    4. Schedule a professional pump and full-system check.
    5. Confirm local wastewater regulations and permits.
  • Official resources:

Durant

Durant sits in a mix of urban and rural settings within Scott County. In the more rural tracts, septic systems may still serve homes and small developments.

  • Typical maintenance tips:
    • Keep a maintenance calendar and documented pump dates.
    • Install a filtration or effluent screen if recommended by a pro.
    • Conserve water to reduce strain on the system.
    • Avoid chemical cleaners that disrupt beneficial bacteria.
  • If you're buying a home with a septic system:
    1. Get a licensed septic inspection before purchase.
    2. Locate and map the tank and leach field.
    3. Look for surface indicators of failure and gather maintenance records.
    4. Check sump pumps and water softeners' drainage alignment with the septic system.
    5. Verify compliance with local wastewater guidelines.
  • Official resources:

Riverdale

Riverdale and nearby rural sectors commonly rely on septic systems when public sewer access is limited. Understanding system placement and maintenance is important for property stewardship.

  • Typical maintenance tips:
    • Schedule regular pumping every 3–5 years; tailor to household size and usage.
    • Protect the drain field from construction or vehicle traffic.
    • Use a septic-safe toilet paper and products to minimize solids.
    • Monitor for standing water, odors, or damp ground over the drain field.
  • If you're buying a home with a septic system:
    1. Obtain an up-to-date septic inspection report.
    2. Verify tank age and condition with the seller.
    3. Inspect the leach field for signs of distress.
    4. Confirm all permits and past repairs are properly documented.
    5. Review ongoing maintenance requirements with a local pro.
  • Official resources:

Eldridge

Eldridge, though a smaller city, includes areas outside centralized sewer service where septic systems remain a practical option. Residents should stay informed about local sewer extensions and septic health.

  • Typical maintenance tips:
    • Keep heavy equipment off the septic area and avoid planting trees with deep roots nearby.
    • Have the system evaluated after prolonged droughts or floods.
    • Use a septic-friendly cleaning routine and avoid harsh solvents.
    • Maintain a simple map of tank and leach field locations for future work.
  • If you're buying a home with a septic system:
    1. Secure a qualified septic inspection.
    2. Confirm tank size, type (conventional vs. alternative), and location.
    3. Check for pump records and field performance.
    4. Ensure compliance with local wastewater guidelines.
    5. Plan for ongoing maintenance and future replacements.
  • Official resources:

Septic vs Sewer Across Scott County

What's the difference here

In Scott County, the system you rely on depends largely on where you live. Rural properties are commonly served by on-site septic systems that treat wastewater on the property. Most urban and suburban homes connect to municipal sewers that carry wastewater to a central treatment plant. Septic systems are self-contained, while sewers are part of a city or county network managed by the utility.

How to tell what serves your property

  • Step 1: Check with your city or Scott County Public Works to confirm whether municipal sewer is available at your address.
  • Step 2: Look at your property records or your last utility bill to see if a sewer hookup is listed or if a septic system is noted.
  • Step 3: If you're unsure, hire a licensed local septic contractor or plumber to verify the type of system and its condition.

Costs and ongoing maintenance

  • Septic system (on-site): installation and design depend on soil, tank size, and leach field. Regular maintenance includes pumping every 3–5 years (or as recommended by a pro) and periodic inspections.
  • Municipal sewer hookup: one-time connection fee and ongoing monthly sewer charges based on use. Utilities may have tiered rates and potential increases with wastewater volume.
  • Maintenance tips: use water efficiently, protect the drainfield from heavy equipment, and avoid flushing chemicals, grease, or non-biodegradable items that disrupt treatment.

Pros and cons at a glance

  • Septic systems
    • Pros: typically lower monthly costs, on-site control, and independence from city sewer schedules.
    • Cons: responsibility for maintenance, potential failures if not pumped or soil-tested, and environmental risk if poorly managed.
  • Municipal sewers
    • Pros: no on-site tank maintenance, city-backed backups or repairs, and predictable monthly bills.
    • Cons: ongoing utility costs, potential for backups during rain events or mainline issues, and required connection if you're in a serviced area.

Quick steps to decide for your home

  1. Confirm sewer availability for your address with the local city or Scott County.
  2. If septic, schedule a professional evaluation to assess tank condition, soil health, and leach-field status.
  3. If sewer is available and you're connected, review your latest bill and compare ongoing costs with typical septic maintenance scenarios for your household.

Official resources

  • Iowa Department of Natural Resources: Onsite Wastewater Systems (OWTS) —
  • U.S. Environmental Protection Agency: Septic Systems Guide —