Septic in Eagle, ID

Last updated: Mar 21, 2026

Eagle's pine-studded streets and open lots give homeowners a sense of room to grow, even when the city is just a short drive away. Here, many families live in homes that feel a little more rural, and that often means on-site wastewater systems are part of daily life. As a local septic contractor who's helped dozens of Eagle families, I'm glad you're here for practical, trustworthy guidance you can act on right away.

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

Yes—septic systems are common in Eagle, especially on properties outside public sewer lines or older neighborhoods that weren't connected to a centralized sewer system. If you own or are buying a home in Eagle, you should plan for a septic system unless you've confirmed it's connected to city sewer. Here are quick steps to verify:

  • Check with the seller or listing agent about sewer service and look for any sewer district maps.
  • Ask Ada County or the local sewer district (if applicable) whether the property is on public sewer.
  • Look for a septic permit or as-built plans on file; know your tank size (commonly 1,000–1,500 gallons for many homes) and the location of the septic and drain field.
  • Have a qualified septic inspector evaluate the system before closing if you're buying.

Why homes typically use septic systems in Eagle

Eagle grew up as a mix of rural parcels and suburban lots, and the town's growth didn't always coincide with extending sewer lines. A few practical realities drive septic adoption here:

  • Geography and soils: Many lots sit on soils that drain slowly or have challenging layers, making on-site treatment a sensible option.
  • Cost and logistics: Extending sewer mains across rolling hills and new subdivisions can be expensive and disruptive. On-site systems avoid those costs for individual lots.
  • Local development pattern: A mix of older, private wells and less dense development means on-site treatment remains a practical and familiar choice for homeowners.

High-level explanation: why septic exists here

A septic system treats wastewater on the property rather than sending it to a central plant. Wastewater flows from the house into a tank where solids settle; liquids move out to a drain field where soil and microbes do their work. In Eagle, this on-site approach aligns with many convoys of hillside lots, smaller urban parcels, and the ongoing balance between growth and local infrastructure. Proper design, installation, and regular maintenance are essential for long-term reliability.

Want practical, neighborly tips you can act on this week? You're in the right place—we'll walk with you every step of the way.

Where Septic Systems Are Common in Eagle

Map of septic coverage in Eagle, ID

Geographic pattern in Eagle

  • Septic systems are most common in Eagle in areas outside the city's sewer service boundary or in neighborhoods that were developed before centralized sewer connections were extended.
  • You'll also see septic more often on hillside or rural lots where gravity sewer lines are harder to install or cost-prohibitive.
  • In short, if your property sits on the edge of town or in a semi-rural subdivision, chances are good you're on a septic system rather than city sewer.

Why septic remains common here

  • Cost and practicality: Extending sewer lines to new or spread-out developments is expensive. For many homeowners, septic is a practical, long-term option when municipal service isn't nearby.
  • Lot size and spacing: Many Eagle properties outside core urban areas feature larger lots (half-acre to several acres), which are well-suited to conventional or mound septic systems.
  • Soil, topography, and groundwater: Soils with limited percolation, steep slopes, or shallow groundwater can make extending sewer infrastructure tricky. In these cases, well-designed onsite systems often perform reliably when properly maintained.
  • Growth patterns: Eagle has grown rapidly, but not every new subdivision is immediately connected to a regional sewer network. On those parcels, septic becomes the default wastewater solution unless a sewer line is brought in later.

Typical home patterns you'll see

  • Rural and semi-rural dwellings with private lots that aren't within the immediate sewer corridors.
  • Older subdivisions that predate expansion of centralized sewer service.
  • Homes near natural features or in terrain that complicates gravity sewer installation (which makes septic a more predictable choice).

How to tell if your property uses septic

  1. Check sewer service status with local authorities
  2. Start with Ada County Environmental Health or the City of Eagle to confirm whether a sewer connection is available or required for your property.
  3. Official resources:
    • Ada County Environmental Health – Septic systems:
    • Idaho DEQ Onsite Wastewater Management:
  4. Look for physical wastewater features
  5. Identify a septic tank lid or riser in the yard and a buried drainfield or leach field area, which indicates a septic system.
  6. If you're unsure, a licensed septic contractor can locate the system and assess its condition.
  7. Review permit or service records
  8. Property records or well/water permits may note septic system installation dates, maintenance reports, or expansion work.
  9. County records often hold system permits and design information.
  10. If in doubt, get a professional evaluation
  11. A licensed septic inspector can confirm system type (conventional, mound, or alternative), assess current function, and identify any upgrade needs before selling or major renovations.
  12. Regular maintenance steps—pump schedules, tank inspections, and drainfield care—keep septic systems reliable in Eagle's local conditions.

Quick tips for Eagle septic success

  • Mind the drainage: Keep surface runoff away from the drainfield to prevent saturation.
  • Protect the drainfield: Avoid driving or parking on the leach field; plant deep-rooted trees far from the system.
  • Schedule routine maintenance: Regular pumping and inspections reduce the risk of backups and costly repairs.
  • Plan for expansions: If you're adding bedrooms or increasing wastewater load, consult a pro to ensure the system can handle the change.

Helpful resources

  • Idaho DEQ Onsite Wastewater Management: guidance, standards, and permits for onsite systems. or search for "City of Eagle Idaho sewer" for the latest page

Common design considerations in Eagle

  • Conventional gravity systems work well on many Eagle lots with suitable soil and adequate setback distances.
  • Mound or alternative treatment systems may be used on properties with poor percolation or limited depth to groundwater.
  • Proper setback distances from wells, property lines, and water features are essential for safety and performance; design and placement should follow local and state requirements.

Septic vs Sewer: What Homeowners in Eagle Should Know

How public sewer and septic systems work in Eagle

  • Public sewer: Wastewater travels through a network of underground pipes to a treatment plant. You're billed by the utility for sewer service, and the system is managed by a local authority.
  • Septic system: Wastewater is treated on-site in a septic tank, with effluent dispersing through a drain field. Maintenance is homeowner responsibility, and there's no monthly sewer bill if you're not connected to a public sewer line.

Knowing which setup serves your property is essential for budgeting, maintenance, and local compliance.

How to tell which system serves your home

  1. Check bills and records:
  2. Look at your monthly utility bill or property tax bill for a sewer service line charge.
  3. Review property records or the deed for notes about public sewer connections.
  4. Inspect your property:
  5. If you have a manhole cover or access lid in your yard, you may have a septic tank or the main sewer line access.
  6. A drain field area in the yard is a common sign of on-site septic.
  7. Ask the right people:
  8. Contact the City of Eagle Public Works (or your county/ district health department) to confirm service type for your address.
  9. Check with your realtor or previous owner if records aren't clear.

Financial considerations

  • Initial costs:
    • Sewer connection to a public system can involve hookup fees and possibly capacity charges, depending on location and main availability.
    • Septic system installation or replacement is a major one-time investment, often running several thousand dollars plus soil approvals.
  • Ongoing costs:
    • Public sewer comes with regular monthly or quarterly sewer charges.
    • A septic system requires periodic pumping (roughly every 3–5 years for a typical home) and occasional professional inspections.
  • Long-term planning:
    • If your lot won't be connected soon, a septic system may be the most practical option.
    • If you expect upgrades to city sewer service in your area, a future connection could simplify maintenance but may incur connection costs.

Maintenance basics for septic users

  • Schedule pump-outs every 3–5 years (more frequently with heavy use or certain household chemicals).
  • Avoid flushing non-biodegradable items, fats, oils, solvents, and harsh chemicals.
  • Use water efficiently: spread out laundry, fix leaks promptly, and use high-efficiency fixtures.
  • Protect the drain field: keep heavy equipment and parking off the area; plant only shallow-rooted vegetation.
  • Have a professional inspect the system during major renovations or every few years to catch issues early.

Pros and cons at a glance

  • Public sewer
    • Pros: Lower maintenance burden, no drain-field risk on your property, predictable monthly costs.
    • Cons: Ongoing sewer charges, potential rate increases, utility outages can disrupt service.
  • Septic system
    • Pros: Independence from city wastewater rates, no monthly sewer bill, suitable in areas not served by sewer.
    • Cons: Regular pumping and maintenance required, risk of costly failures if poorly maintained, potential property-use restrictions near the drain field.

When to consider switching from septic to sewer

  1. Confirm service coverage for your address with the local authority.
  2. Assess the cost and logistics of tying into the public sewer line.
  3. Obtain a formal estimate for sewer hookup and any necessary upgrades or permits.
  4. Plan for any required site assessments or inspections as part of the connection process.
  5. Review long-term financials: ongoing sewer fees vs. septic maintenance costs.

Important resources

Typical Septic System Types in Eagle

Conventional gravity septic systems

  • How it works: Wastewater flows by gravity from the house into a septic tank, where solids settle. The clarified liquid then moves by gravity into a drainfield of perforated pipes buried in soil.
  • Typical setup: A buried tank (often 1,000–1,500 gallons) with a drainfield trench or bed sized to fit soil conditions, slope, and lot size.
  • Why homeowners see this: It's the most common, cost-effective option on suitable soils.
  • Key considerations: soil depth, drainage, and proper pumping interval.

Pressure distribution systems

  • What makes them different: A pump (often in a dosing chamber) distributes effluent evenly to multiple lines in the drainfield.
  • Benefits: Uses the entire drainfield more uniformly, which helps on uneven terrain or soils with varying percolation.
  • Maintenance note: Requires reliable pumps and occasional dosing system checks.

Mound systems

  • When you'd use one: If soil near the surface is too shallow, with high groundwater or very slow absorption, a raised "mound" drainfield is built above natural soil.
  • How they're built: A sand fill layer is installed over a lateral distribution system, then covered with topsoil and vegetation.
  • Pros/cons: Great for challenging sites; higher upfront cost and more long-term maintenance than a conventional system.

Sand filter systems

  • Purpose: An engineered filter bed provides additional treatment before the effluent reaches the drainfield.
  • Typical use: For properties with marginal soils or where extra treatment is desired to protect groundwater.
  • Maintenance: Requires periodic inspection and sometimes media or filter changes.

Aerobic treatment units (ATUs)

  • Function: A compact pre-treatment system that introduces air to degrade organics before the effluent enters the drainfield.
  • When they're chosen: On properties needing higher treatment levels, tight lots, or soils that don't provide adequate natural treatment.
  • Care tips: Regular service by a licensed contractor; routine monitoring of the aerators, alarms, and discharge filters.

Chamber systems and prefabricated drainfields

  • What they are: Interconnected plastic chambers replace traditional gravel trenches, increasing infiltrative area with less backfill.
  • Why homeowners like them: Easier installation on some sites; can be more forgiving of minor grade changes.
  • Maintenance: Similar to conventional systems; still requires regular pumping and soil monitoring.

Holding tanks and other temporary options

  • When used: In places where soil or regulatory conditions prevent a drainfield, or during site redevelopment/transition periods.
  • Important note: Holding tanks need frequent pumping and must align with local approvals and timelines.

Other regional options (site-specific)

  • Drip irrigation or evapotranspiration (ET) beds: Used on select Eagle lots with special design allowances.
  • Greywater considerations: Local rules typically restrict how graywater is managed within a residential septic plan; always verify with local authorities.

Maintenance and inspections (quick steps)

  1. Schedule a professional pump-out every 3–5 years (or per your system's manual and usage).
  2. Have a licensed septic contractor inspect for cracks, effluent filters, and pump alarms at least annually.
  3. Protect the drainfield: avoid heavy equipment, keep vehicles off, and plant only shallow-rooted vegetation.
  4. Use water wisely and minimize solids: disposal practices and limited garbage disposals help prolong life.

What to know for Eagle homeowners

  • Permitting and inspections are typically handled by local health/environmental departments, such as Ada County Health Department. Check with local officials for requirements before any installation or modification.
  • For official guidelines and permitting information:
    • Ada County Health Department septic systems:
    • Idaho Department of Environmental Quality (Wastewater/Sewage Disposal):

Common Septic Issues in Eagle

High groundwater and seasonal wet conditions

In Eagle, the combination of winter snowmelt, spring rains, and irrigation can push groundwater higher than in drier regions. When the drain field sits in saturated soil, effluent has nowhere to go, which can cause backups, slow flushing, and soggy patches in the yard.

What you'll notice

  • Pooling or soggy ground over the leach field
  • Wet, spongy areas in the yard that persist after rainfall
  • Slow draining toilets or backups in sinks during wet seasons

Why Eagle is unique

  • Treasure Valley soils vary, but many yards experience higher groundwater in spring and after irrigation cycles, especially with clay-heavy soils that resist drainage.
  • Homes farther from centralized sewer rely on onsite systems year-round, so wet conditions magnify stress on drain fields.

What to do (step-by-step)

  1. Minimize water spikes during wet periods (spread laundry, postpone heavy water use).
  2. Have a licensed septic professional evaluate for a perched or saturated drain field.
  3. Consider drain-field designs suited for high water tables (elevated/mound systems if appropriate).
  4. Avoid parking or placing heavy objects on the drain field to prevent compaction.

Official resources

  • Idaho DEQ Onsite Wastewater guidance:
  • EPA Septic Systems information:

Aging or undersized systems

Some Eagle homes installed decades ago still operate on older tanks and leach fields that may no longer meet current loading or code standards. Age-related wear, improper sizing, or missed maintenance can lead to frequent failures.

What you'll notice

  • Frequent pumping without lasting improvement
  • Backups after normal levels of use
  • Unexpected odors or damp areas in the yard

Why Eagle is unique

  • Housing stock in older Eagle neighborhoods often relies on smaller or outdated systems that don't handle modern water use patterns.

What to do (step-by-step)

  1. Schedule a professional system evaluation and documentation of tank size, baffles, and field condition.
  2. If needed, plan for a replacement or upgrade with an installer who understands Idaho codes.
  3. Consider adaptive designs and advanced treatment units if you anticipate growth or higher wastewater loads.

Official resources

High water use and improper disposal habits

Excessive water use or disposing of solids down the drain stresses any septic system, especially in Eagle where soils and groundwater conditions can magnify those effects.

What you'll notice

  • Short cycles of pumping with little improvement
  • Frequent clogs or backups after laundry or shower use
  • Odors around the house or yard

What to do (step-by-step)

  1. Space out laundry and dishwashing to avoid peak loads.
  2. Use high-efficiency appliances and aerators on faucets.
  3. Use drain strainers and avoid pouring grease or solids down the drain.
  4. Have high-use periods monitored by a pro to adjust your system design if needed.

Official resources

Odors, backups, and venting issues

Persistent odors or gurgling can indicate a venting problem, a compromised baffle, or a failing system.

What you'll notice

  • Strong odors near the septic tank or drain field
  • Gurgling sounds in plumbing
  • Slow drainage after a normal water use

What to do (step-by-step)

  1. Have the vent stack inspected for blockages.
  2. Have a pro check tank baffles, lids, and seals for leaks.
  3. If a leak or failure is found, plan for repair or replacement promptly.

Official resources

Resources and general guidance

Septic Inspection, Permits & Local Oversight

Governing bodies in Eagle, ID

  • Central District Health Department (CDHD) oversees on-site wastewater system permitting and inspections in Ada County, including Eagle. This is the primary local authority for new installations, substitutions, and compliance checks.
  • Idaho Department of Environmental Quality (DEQ) provides state-wide rules, guidance, and oversight for on-site wastewater programs and technician licensing. Local agencies apply these rules to specific sites.
  • City of Eagle and Ada County may share responsibilities for permitting and construction oversight. If you're in Eagle city limits, check with the city's planning/building department in addition to CDHD; if you're outside the city limits, Ada County Development Services and CDHD will handle most permitting and inspections.

Official resources:

  • Idaho DEQ On-Site Wastewater:
  • Central District Health Department:
  • Ada County Development Services (for county-wide building/planning coordination):

Permits you may need

  • On-site Wastewater System Permit (new, replacement, or upgraded systems)
  • Soil evaluation and percolation test approvals (as part of system design)
  • Building permit if you're constructing a new home or making significant additions that affect wastewater dispersal
  • Grading or land-disturbance permits if the work involves substantial site changes

Note: All work typically requires approval from CDHD or the county, and some projects may require coordination with Eagle city staff if located within city boundaries.

Steps to get a permit (numbered)

  1. Confirm jurisdiction
  2. Call CDHD and your city or county planning office to confirm which agency issues your permit.
  3. Hire the right professionals
  4. Engage a licensed on-site wastewater designer/engineer or a qualified installer familiar with Idaho DEQ rules and local crossover requirements.
  5. Site evaluation and design
  6. Schedule soil tests and site evaluations as required. A compliant design will account for soil limitations, setbacks (water wells, streams, property lines), and appropriate drain field sizing.
  7. Submit the permit package
  8. Prepare the permit application, design drawings, site plan, and any required fees. Include the as-built or proposed installation details as requested.
  9. Obtain permits and schedule inspections
  10. Once approved, you'll receive permit numbers and inspection windows. Plan for pre-construction, during installation, and final inspections.
  11. Stay compliant during construction
  12. Keep records, receipt notices, and inspection reports handy. Any deviations from the approved design may require amendments and re-inspection.

Inspection timeline and what to expect

  • Pre-construction inspection: verify final siting, setbacks, and access to the work area.
  • Rough-in/installation inspection: trenches, piping, septic tank, distribution box, and drain field components are checked for correct installation, materials, and alignment.
  • Final inspection: confirm proper connection to the house, functioning components, cover wells, and proper site restoration. An as-built plan should be submitted if required.
  • If issues arise, inspectors will note corrections needed and may require a re-inspection after work is completed.

Local oversight tips

  • Always secure permits before any excavation or system work begins.
  • Keep a filed copy of all permits, inspection records, and design approvals.
  • If anything changes on-site (soil conditions, proposed drain field, setback distances), contact CDHD or Ada County early to avoid delays.
  • Some Eagle addresses might require city-specific reviews in addition to county oversight; when in doubt, ask early.

Resources

Septic Maintenance for Homes in Eagle

Understand your Eagle system

  • Keep a current diagram of your OSDS (on-site disposal system): where the septic tank is, where the drainfield sits, and the location of the distribution box. In Eagle, many homes use traditional septic tanks with a drainfield tailored to occupancy and soil. Size and age of the tank affect maintenance needs; common residential tanks range from 1,000 to 1,500 gallons.
  • Note your occupancy and recent water use. More people or heavy irrigation during Idaho summers can push the system harder in a short window.

Regular pumping and professional inspections

  • Schedule pumping on a regular cycle tailored to your home. Typical intervals are every 3–5 years for average households, but a smaller tank or heavy use may require more frequent service. Have a licensed septic contractor confirm the ideal interval for your situation.
  • Plan a combined pumping and inspection visit. A thorough check includes inspecting the tank for scum, sludge, baffles, and any signs of cracking, plus a basic evaluation of the drainfield's condition.
  • Steps to book service:
    1. Find a state-licensed septic contractor in the Eagle/Ada County area.
    2. Ask for a pumped tank with a written inspection report.
    3. Request recommendations based on current sludge levels and drainfield performance.

Protect the drainfield in Eagle's climate

  • Keep the drainfield area free from heavy equipment, dumpsters, or vehicles. Compaction reduces soil porosity and slows effluent absorption.
  • Maintain a healthy drainage zone with grass cover; avoid planting trees or shrubs with aggressive or deep root systems near the drainfield.
  • Limit irrigation over the drainfield. Excess irrigation can saturation the soil and reduce treatment efficiency.
  • In winter, minimize soil saturation from snowmelt around the drainfield. Avoid piling snow directly on the drainfield cover, which can insulate and freeze components.

Water use and fixtures

  • Install and maintain high-efficiency fixtures: low-flow toilets, faucets, and efficient laundry appliances reduce daily load on the system.
  • Spread out laundry and dishwasher use. Do not run multiple high-water-use loads at the same time; this helps prevent short-term overload of the drainfield.
  • Consider a simple water-use plan for busy Eagle households: run full loads and delay small, frequent usages when possible.

Household chemicals and septic health

  • Use septic-safe cleaners and minimize harsh chemicals, solvents, and non-biodegradable products flushing into the system.
  • Avoid putting fats, oils, and greases down the drain, and limit coffee grounds, cat litter, and paper towels from entering the system.
  • Do not flush pesticides, paints, solvents, or automotive fluids. If you're unsure whether a product is septic-safe, check with your local septic professional or consult official guidance.

Winter and seasonal considerations

  • Cold winters in Eagle can slow bacterial activity. Keep the system from being oversaturated by reducing unnecessary water use during cold months.
  • Keep access lids visible and accessible; remove snow carefully to avoid covering or obstructing access to tanks and lids.
  • Use non-corrosive, non-damaging de-icers near the system. Avoid dumping large quantities of salt near the drainfield, which can affect microbial activity over time.

Signs of trouble and what to do

  • Slow drains, gurgling noises, or sewage odors in the house.
  • Wet, spongy patches or bright green, unusually lush growth over the drainfield in the yard.
  • Backups in one fixture or repeated drain trouble after heavy rain.
  • If you notice any warning signs, contact a licensed septic professional promptly for a diagnostic pump, inspection, and potential drainfield evaluation.

Helpful resources

  • Idaho Department of Environmental Quality — Septic Systems:
  • U.S. Environmental Protection Agency — Learn about septic systems:

Cost Expectations for Septic Services in Eagle

Inspection and diagnostics

  • What's included: site visit, visual system inspection, review of maintenance history, and basic diagnostics. In Eagle, inspectors often assess soil conditions and access challenges that can affect diagnostic depth. Some jobs include a dye test to confirm system function and potential leaks.
  • Why Eagle matters: local soil variability and groundwater patterns can influence how thorough a diagnosis needs to be and what equipment is required.
  • Typical cost: basic inspection $150–$250; full diagnostics with dye test and written report $250–$350.

Septic tank pumping and cleaning

  • What's included: removing accumulated sludge and scum, measuring tank contents, inspecting baffles and covers, and confirming proper outlet flow. In Eagle, access to tanks can vary based on yard layout and driveway conditions, which can affect time and price.
  • Why Eagle matters: tank size drives cost in this area; many homes use 1000–1500 gallon tanks, though some older homes have different configurations.
  • Typical cost: 275–550 for a standard 1000-gallon tank; larger tanks or difficult access can push toward 600–800.

Drainfield evaluation and soil testing

  • What's included: assessment of existing drainfield performance, soil percolation evaluation, and often a planned path for any repairs or expansion. In Eagle, soil types and slope can influence the recommended test method.
  • Why Eagle matters: a thorough drainfield check helps prevent costly failures in a region with diverse soils and groundwater considerations.
  • Typical cost: 500–1,000, depending on scope (site visit, trench tests, and reporting).

Aerobic treatment unit (ATU) and mound system service

  • What's included: ATU/advanced treatment unit servicing, filter cleaning or replacement, aerator checks, pump operation test, and outlet filtration. Mounds and ATUs are more common in areas with marginal native soil, like some Eagle parcels.
  • Why Eagle matters: these systems require specialized parts and knowledge; maintenance may be more frequent.
  • Typical cost: 300–600 for routine service; maintenance contracts often 500–1,000 per year.

System installation or replacement

  • What's included: design consultation, percolation/soil tests, permit coordination, trenching or mound construction, tank installation or upgrade, and final inspection. Eagle's terrain and soils mean some installs are conventional, while others are mound or ATU-based.
  • Why Eagle matters: higher upfront work for challenging soils or hillside properties; permits typically required.
  • Typical cost: conventional system 10,000–25,000; ATU/mound configurations 20,000–60,000+.

Drainfield repair and replacement

  • What's included: repair options (partial trench replacement, distribution box adjustments, or complete drainfield replacement), soil replacement, and regrading as needed. In Eagle, accessibility and soil depth can influence scope and price.
  • Typical cost: 5,000–25,000, depending on extent and access.

Regular maintenance plans and preventive service

  • What's included: scheduled pump-outs, inspections, filter changes, and record-keeping to extend life of the system. In Eagle, a maintenance plan helps homeowners avoid unexpected failures.
  • Typical cost: 150–400 per year for a basic plan; more comprehensive plans may run 500–1,000.

Emergency and after-hours service

  • What's included: urgent pump-outs, troubleshooting, and temporary solutions to prevent backups.
  • Typical cost: standard rate plus 1.25x–2x after hours, depending on the contractor and time.

Hydro-jetting and line cleaning

  • What's included: high-pressure cleaning of internal pipes, inspection for breaks or root intrusion, and line restoration.
  • Typical cost: 200–350 per hour, plus any disposal or docking fees.

Steps to plan and budget (quick reference)

  1. Get 2–3 written estimates, specifying tank size and access needs.
  2. Confirm permit or inspection requirements with local authorities.
  3. Ask about maintenance plans and what's included (filters, alarms, dye tests).
  4. Discuss access constraints (driveways, crawl spaces, yard work) and potential travel fees.
  5. Review warranties on tanks, lids, and installed components.

Resources

  • Idaho Department of Environmental Quality – On-Site Wastewater Program:
  • U.S. Environmental Protection Agency – Septic Systems: https://www.epa.gov/septic