Septic in Rochester, IL

Last updated: Mar 21, 2026

Rochester, IL isn't a big city with a single sewer map—it's a community where many homes quietly run on private septic systems, tucked behind well-kept lawns and shade trees. If you're newer to town or shopping for a house here, you'll likely encounter properties that rely on on-site wastewater treatment rather than a centralized sewer line.

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

  • Yes, septic is common, especially in:
    • older neighborhoods where city sewer lines didn't reach every lot
    • rural pockets just outside the town core
    • homes built before sewer service expanded across parts of the area
  • You should expect that a good number of single-family homes here rely on a septic system unless they're inside a municipal sewer district or connected to city sewer. To be sure, check the property disclosures, ask the listing agent, or review the local sewer map. If you're buying, plan for a septic inspection by a licensed professional as part of your due diligence.

Why homes typically use septic systems in Rochester

  • Historic development pattern: Rochester grew outward from farmland and residential plots where extending centralized sewer lines wasn't practical or cost-effective.
  • Cost and practicality: Extending sewer mains to every lot can be expensive, so on-site treatment offered a sensible, scalable solution for many neighborhoods.
  • Soil and site factors: In many parts of town, soils and groundwater conditions support well-designed septic systems when properly installed and maintained.
  • Ownership and maintenance: Private septic systems give homeowners direct responsibility for care, which can be advantageous for those who want simple, local control over their wastewater management.

High-level explanation (why septic exists here)

  • A typical septic setup involves a tank to settle solids and a drain field to distribute treated liquid into the soil. Proper design, installation, and regular maintenance—such as periodic pumping every few years—keep the system functioning well.
  • When soils are too shallow or water tables are high, specialized designs (like mound systems) may be used to ensure safe, effective treatment.
  • Regular maintenance basics: conserve water, avoid flushing non-degradables, and schedule inspections and pumping with a licensed septic pro.

As you explore Rochester homes, this practical context helps you ask the right questions and plan for maintenance and costs with confidence.

Where Septic Systems Are Common in Rochester

Map of septic coverage in Rochester, IL

Geographic patterns in Rochester

  • Rochester sits in Sangamon County, just northwest of Springfield. In this area, private septic systems remain common in several settings:
  • Rural and semi-rural residential parcels outside central sewer service boundaries.
  • Older neighborhoods established before sewer lines were extended.
  • Subdivisions with smaller lot sizes that aren't economically feasible for public sewer connections.
  • Agricultural or equestrian properties that rely on private wastewater treatment.
  • Areas where soil and groundwater conditions favor septic drainfields or require alternative designs (such as mound or specialty systems) due to site constraints.

Why these patterns exist in Rochester

  • Service reach and cost: Extending centralized sewer lines to low-density or distant parcels is expensive, so private septic systems persist in outlying areas.
  • Development history: Much of Rochester's growth occurred in phases, with septic as the standard until sewer service reached newer or farther parcels.
  • Site conditions: Soils vary across the area. Some sites drain well and support standard septic systems, while others have clay-heavy soils, high water tables, or bedrock that necessitate specialized designs or reduced lot density.
  • Regulatory framework: When sewer service isn't available, homeowners rely on properly designed and maintained onsite wastewater systems (OWTS). Local health departments and the state regulate permits, inspections, and maintenance to protect public health and groundwater.

Practical considerations for Rochester homeowners

  • Confirm your status: Start by finding out whether your property is connected to municipal sewer or supported by a septic system. Check Rochester village records or speak with the village hall or your county health department for maps and confirmations.
  • Locate and assess your system: If you have a septic system, locate the tank and drainfield and review any available pumping records or as-built drawings. A licensed septic contractor can perform a formal site evaluation and assess current performance.
  • Maintain proactively: Regular maintenance extends system life and protects your investment. Typical septic pumping intervals are every 3–5 years for a standard household, but your schedule may vary with usage, number of occupants, and tank size.
  • Watch for warning signs: Pooling or lush areas over the drainfield, bad odors near plumbing, toilets backing up, or unusually slow drains can indicate a problem. Address issues early with a qualified installer to avoid costly damage.
  • Plan for changes: If sewer expansion is announced or funded in your area, understand timelines, costs, and how connection would affect your property and septic system needs.

Quick reference steps for Rochester homeowners (when in doubt)

  1. Verify sewer status with the village of Rochester or Sangamon County health resources.
  2. If septic, obtain records and have a licensed professional inspect the system.
  3. Schedule regular maintenance and follow best-use guidelines to prevent failures.
  4. Stay informed about sewer expansion plans in your area and how they may impact your property.

Official resources for further guidance

Septic vs Sewer: What Homeowners in Rochester Should Know

Quick difference at a glance

  • Ownership and responsibility: Septic system = homeowner maintains; municipal sewer = city or county maintains and bills you.
  • Maintenance needs: Septic requires regular pumping and inspections; sewer typically requires less personal upkeep, managed by the utility.
  • Installation and space: Septic needs a suitable lot with drain field; sewer relies on a connection to the public system.
  • Costs and bills: Septic involves upfront installation and periodic pumping; sewer involves ongoing monthly or quarterly charges based on use.

How Rochester homes typically fare

In Rochester, IL, many homes rely on private septic systems, especially in older neighborhoods or on larger lots. Some newer areas near city lines may connect to a municipal or county sewer system. To know which applies to your property, check your property deed and tax records, or contact the City of Rochester Public Works or the county clerk. If you're unsure, a licensed septic contractor can help identify the system type during an on-site review.

Cost considerations

  • Septic system
    • Upfront installation: commonly several thousand dollars, with total costs ranging broadly depending on soil, lot size, and system design.
    • Ongoing maintenance: pumping every 3–5 years, plus occasional inspections and repairs.
  • Municipal sewer
    • Ongoing charges: monthly or quarterly bills based on usage and local rates; some towns include in a combined utility bill.
    • No drain-field maintenance by the homeowner, but you may incur connection or hook-up fees if you're newly connected.

Maintenance responsibilities

  • Regular pumping and inspection
    • Schedule pumping every 3–5 years (or as recommended by a local licensed pro) and keep records.
    • Have a professional inspect the tank and baffles/filters to catch problems early.
  • Protect the drain field
    • Avoid driving or parking on the leach field; plant only shallow-rooted grasses nearby; keep heavy loads and construction away.
    • Use water wisely: fix leaks, install high-efficiency fixtures, and spread out laundry and dishwasher use.
  • Waste management
    • Don't flush non-biodegradable items, grease, solvents, or chemicals; they can disrupt beneficial bacteria and clog the system.
    • Use septic-safe products and avoid harsh cleaners that harm the bacterial ecosystem.

When to consider a sewer connection

  1. Confirm with City of Rochester Public Works or your local utility whether your property is within the service area and eligible for connection.
  2. Obtain a formal estimate for the hookup, any required taps, and permit fees.
  3. Check for available grants, financing, or developer options if you're building a new home or expanding an existing system.
  4. Hire licensed professionals for the pipe connection and any required backfill, connections, and pressure testing.

Signs something may be wrong

  • Slow drains, gurgling sounds, or frequent backups.
  • Sewage odors near the house or yard.
  • Wet, unusually lush spots or soggy areas above the drain field.
  • Water or sewage pooling in the yard after rainfall.
  • Excessive and frequent pumping or repairs.

Resources

  • EPA septic systems overview:
  • City of Rochester, IL official site (verify sewer service status):

Typical Septic System Types in Rochester

Conventional septic systems

Conventional gravity septic systems are the backbone of rural and semi-rural Rochester properties. They use a septic tank to settle solids and a soil absorption field (drainfield) to treat and disperse the liquid effluent. The size and layout depend on lot conditions, soil, and local codes.

  • Key components: septic tank, distribution box, perforated drainfield pipes, and trenching in native soil.
  • Best when soils are moderately well-drained and depths to groundwater or bedrock allow a long, permeable drainfield.
  • Pros: Generally lower upfront cost, straightforward maintenance.
  • Cons: Performance hinges on soil suitability; improper stewardship can lead to backups or failure in poorly drained soils.

For an overview, see EPA's Septic Systems guide: https://www.epa.gov/septic and Illinois EPA's onsite wastewater guidance: https://www2.illinois.gov/epa/topics/waste-management/wastewater/onsite/Pages/default.aspx

Aerobic Treatment Units (ATUs) and packaged systems

ATUs treat wastewater with added oxygen, producing a higher-quality effluent before it enters a drainfield. They're common on properties with challenging soils, smaller lots, or where a higher level of treatment is desired.

  • How they work: Mechanical aeration and bacteria break down waste more aggressively than a passive tank.
  • Maintenance: Regular inspections, filter changes, and occasional servicing by a licensed professional; power use is higher than conventional systems.
  • Pros: Larger drainfield life in marginal soils; better effluent quality for restricted sites.
  • Cons: Higher purchase and maintenance costs; depend on electricity and scheduled servicing.

Mound systems

Mound systems place the drainfield above the natural soil line, using a fill material and raised bed to provide proper drainage where groundwater is high or soils are too shallow or restrictive.

  • When used: Shallow bedrock, high water tables, or very slowly permeable soils.
  • Key ideas: An elevated drainfield with a rise-infrastructure layer (sand-like media) helps infiltrate effluent safely.
  • Pros: Expands sites that would otherwise be unsuitable.
  • Cons: More complex and expensive to install; requires ongoing maintenance and monitoring.

Sand filter systems

A secondary treatment option often paired with ATUs or conventional tanks. Treated effluent passes through a buried sand filter before reaching the drainfield.

  • Benefits: Improves effluent quality and provides a buffer for marginal soils.
  • Maintenance: Regular inspection and periodic media replacement as recommended by the installer.
  • Considerations: Generally more costly than a straightforward drainfield but can extend system life in tougher soils.

Pressure distribution drainfields

This approach uses a pump to distribute effluent evenly across many trenches, reducing soil saturation and maximizing absorption in slow-perking soils.

  • Why it's used: Prevents drainage problems in uneven or poor-percentage soils.
  • Pros: More uniform performance; can increase drainfield longevity.
  • Cons: Requires more components and careful design.

Drip irrigation and evapotranspiration (ET) disposal

In some Rochester properties, effluent is dispersed via drip lines or ET beds for landscaped areas. These systems require careful design to avoid root intrusion and to protect wells and groundwater.

  • Best when: Landscape irrigation is planned and soils can support controlled infiltration.
  • Caveats: Not universal; must meet local code and water quality requirements.

Choosing the right system for Rochester homeowners

  • Start with a site assessment: soil percolation, depth to groundwater, and lot slope matter.
  • Work with a licensed septic designer or installer familiar with Sangamon County/ROA area requirements.
  • Obtain the necessary permits from the local health department and follow Illinois EPA guidelines.
  • Plan for maintenance: inspections, pump-outs, and component replacements as needed.

Quick-start steps for Rochester homeowners

  1. Have a licensed professional evaluate soil conditions and lot constraints.
  2. Compare conventional, ATU, mound, and sand filter options based on site data.
  3. Confirm permits and disposal-field setbacks with the local health department.
  4. Schedule a maintenance plan and budget for regular service.

Helpful references:

Common Septic Issues in Rochester

Drain-field and soil conditions in Rochester

  • Rochester's soils are often moderately to heavily clayey with variable drainage. In spring, after snowmelt and heavy rains, the ground can stay saturated longer, slowing effluent infiltration.
  • Shallow groundwater and perched water tables can push water into the drain field, making it harder for wastewater to percolate away. When this happens, you may notice soggy areas above the drain field or lingering odors.
  • Poorly draining soils increase the risk of drain-field failure, even if the tank itself is pumping normally. In many Rochester yards, design and placement of the drain field need to account for local soil limits and seasonal moisture.

Root intrusion and landscape challenges

  • Trees and large shrubs planted near the system can send roots into the drain field or lateral lines. Roots can clog or damage pipes, reducing drainage and increasing the chance of backups.
  • Construction, driveways, and heavy equipment nearby can compact soil and disturb the system, limiting its ability to function properly.

Water usage patterns and household size

  • Larger households or frequent use of high-water appliances (lots of laundry, long showers, or running multiple loads of laundry at once) stress the septic system.
  • Frequent short cycling (back-to-back uses) prevents proper settling and digestion, leading to solids buildup in the tank and more solids reaching the drain field.

Sump pump discharge and surface water

  • Overflow from sump pumps or foundation drains can flood the septic system with extra water, saturating the drain field. Never connect a sump pump or rainwater downspout directly to the septic system.
  • In Rochester's wetter seasons, surface water runoff can overwhelm the system even if the tank is correctly sized and in good condition.

Chemical use and waste disposal

  • Harsh chemical cleaners, solvents, paints, or anti-bacterial products can kill beneficial bacteria in the septic tank, slowing breakdown of waste.
  • Disposing of grease, food scraps, coffee grounds, or materials that don't break down easily through the system increases solids buildup and shortens the life of the drain field.

Sump, fixtures, and maintenance habits that raise risk

  • Leaky toilets, running toilets, and dripping faucets add unnecessary water, increasing the load on the system.
  • Delayed pumping, skipping inspections, or using DIY "tank treatment" additives without professional guidance can hide problems until they become backups.

Symptoms you might notice in Rochester

  • Gurgling sounds in drains, slow drainage, or standing water above the drain field.
  • Unpleasant sewer odors near the installation, yards, or vents.
  • Surfaces irrigated by the drain field becoming unusually green or mushy.

Practical steps to minimize Rochester-specific issues

  1. Schedule pumping per your system's age, size, and usage (often every 3–5 years; more frequently for older or heavily used systems).
  2. Conserve water: spread out laundry, repair leaks, and install and use high-efficiency fixtures.
  3. Protect the drain field: keep heavy equipment off the area, plant only grass or shallow-rooted ground cover, and maintain a safe buffer from trees and structures.
  4. Manage roots: identify trees near the system and plan root barriers or relocation if needed.
  5. Route runoff away from the septic area: direct rainwater and sump pump discharge away from the drain field and avoid creating puddles over it.
  6. Use septic-friendly products: choose enzymatic or septic-safe cleaners, and avoid dumping oils, solvents, or medications down the drain.
  7. Maintain records: keep a diagram of the system as-built, plus service, pumping, and professional inspections.

When to call a professional

  • If you notice persistent odors, surface effluent, or gurgling in multiple fixtures.
  • If drainage seems unusually slow after trying basic maintenance.
  • If your yard has recently undergone excavation, construction, or changes that could affect the drain field.

Official resources for Rochester homeowners

  • EPA: Septic systems overview and best practices.

Septic Inspection, Permits & Local Oversight

Permits you may need

  • Installing, replacing, repairing, or expanding a septic system typically requires a permit. In Rochester, IL, oversight is generally handled by the Sangamon County Health Department or the local village building department. If your property sits outside village limits, the county health department is usually the point of contact; inside village boundaries, check with the village department.
  • A typical permit package includes: soil/site evaluation, system design, a site plan showing the leach field and setbacks, and the proposed construction timeline.
  • Always confirm which agency issues the permit for your address before starting work. Permit approval is often required before any excavation begins.

Who oversees septic permits in Rochester, IL

  • County oversight: Sangamon County Health Department (environmental health programs). They handle on-site wastewater permits, inspections, and compliance for parcels outside village limits.
  • Village oversight: If your property lies within the Rochester village boundaries, the village building department may administer the permit and coordinate inspections with the county as needed.
  • State reference: Illinois EPA (IEPA) provides state-level guidance and resources on on-site wastewater systems; local agencies implement and enforce the rules.

How to apply: step-by-step

  1. Confirm jurisdiction
    • Call the Sangamon County Health Department or the Rochester village building department to determine which agency issues your permit.
  2. Hire appropriate professionals
    • A licensed septic designer or engineer and a licensed septic contractor are typically required to prepare plans and perform the installation.
  3. Conduct soil and site evaluation
    • The evaluation determines system type and size. This work is usually done by a qualified soil tester or designer as part of the permit package.
  4. Prepare and submit permit package
    • Include site plans, system design, soil evaluation results, project timeline, and contractor details.
  5. Pay fees and obtain permit
    • Fees vary by project scope and jurisdiction. Expect a permit review period; plan around 4–6 weeks for review in many cases.
  6. Schedule inspections
    • Inspections are required at key milestones: trench or excavation, septic tank and distribution box installation, backfill, and final system acceptance.
  7. Final approval and record
    • After successful inspections, you'll receive final approval and should keep the as-built drawings for future reference.

What happens during the inspections

  • Pre-installation review: Inspectors verify that the site plan and design meet local codes and setback requirements (water lines, wells, property lines, and structures).
  • During installation: Inspectors check tank placement, secure covers, proper baffle configuration, correct backfill material, and trench layout for the leach field.
  • Post-installation: Final inspection confirms the system is correctly installed, functional, and compliant with the approved design. An as-built drawing is often required for the file.
  • Corrections: If issues are found, inspectors request corrective work before final sign-off. Schedule re-inspection as needed.

Home sales, inspections & disclosures

  • If you're buying or selling a home, a septic inspection is commonly requested by lenders or buyers. Lenders may require a clearance or a formal inspection to ensure the system meets current codes and will function properly.
  • Prepare to share the as-built drawings, maintenance records, and any repair receipts with the inspector or potential buyers.

Practical tips for Rochester homeowners

  • Start early: Permit processing can take time—address this before any work begins.
  • Keep records: Store all permits, inspection stamps, and as-built drawings in a central file.
  • Maintain documentation: After installation, maintain a maintenance log and schedule pumpouts per your system's needs.

Official resources

Septic Maintenance for Homes in Rochester

Regular pumping and inspections

  • In Rochester, with central Illinois soils and seasonal rainfall, plan a professional pump-out every 3–5 years for a standard residential tank (typically 1,000–1,500 gallons). More frequent pumping may be needed for smaller tanks, heavy water use, or systems with a lot of solids (garbage disposals, diapers, wipes).
  • Have a licensed septic professional inspect your system annually. Annual checks help verify tank integrity, baffles, lids, and any effluent filters or pumps (if you have an aerobic or advanced treatment unit). Early detection can prevent costly failures.
  • If you have an effluent filter or a pump chamber, ensure the filter is cleaned or replaced as recommended by the manufacturer or your technician.

What to inspect and maintain

  • Inspect tank lids and access risers for cracks or movement; ensure lids are secure and clearly marked.
  • Check the baffles at both inlet and outlet tees; damaged or missing baffles increase the risk of solids reaching the drainfield.
  • For systems with an effluent filter, clean the filter per the service provider's instructions, typically during routine pumping.
  • Monitor the distribution box and any drip or reserve components if your system uses them; look for spoiled or uneven trench operation, wet spots, or gurgling sounds in pipes.

Water use habits that protect Rochester systems

  1. Spread out high-water tasks (laundry, dishwashing) over the week; avoid dumping large soapy loads all at once.
  2. Use high-efficiency toilets, faucets, and showerheads to reduce daily flow.
  3. Fix leaks promptly—even small drips add up to wasted water and increased solids in the tank.
  4. Consider reducing garbage disposal use; compost organic waste when possible to cut solids entering the tank.
  5. Only flush human waste and toilet paper; keep wipes, feminine products, diapers, and chemicals out of the system.

Soil, drainfield, and Rochester-specific considerations

  • Rochester-area soils are often clay-heavy with a tendency toward slower infiltration. A shallow groundwater table in some years increases drainfield exposure to saturation, especially after heavy rains or rapid snowmelt.
  • To protect the drainfield, avoid compacting the soil over it, and prevent heavy equipment, vehicles, or landscaping loads from crossing the field.
  • Plant trees and shrubs away from the drainfield. Roots can invade pipes or trenches and disrupt performance.
  • If your lot has an elevated water table or frequent flooding risk, discuss a site-specific design with a licensed installer (mound systems or alternative treatment units may be appropriate in some Rochester soils).

Seasonal care and flood risk

  • Spring thaw, heavy rains, and flash floods can saturate soils and overwhelm a drainfield. During wet periods, minimize water use and avoid irrigating or washing large loads that strain the system.
  • After significant rainfall or flooding, have a professional inspect the system before resuming normal high-volume uses. Watch for slow drains, gurgling sounds, or wastewater backing up into fixtures.
  • Avoid parking or placing structures on the drainfield, especially in flood-prone zones, to prevent soil compaction and damage.

If you notice problems

  • Odors, wet areas over the drainfield, surface wastewater, or toilets that drain slowly warrant prompt professional evaluation.
  • Reduce water use immediately and limit solids entering the tank (no garbage disposals) until a technician assesses the system.
  • Contact a licensed septic service to diagnose the issue and determine whether pumping, filter cleaning, or a drainfield repair is needed. In cases of spills or major contamination, refer to state guidance from the Illinois EPA.

Official resources for Rochester residents

Cost Expectations for Septic Services in Rochester

Septic Tank Pumping

  • What it includes: removing sludge and scum, cleaning the tank interior, inspecting accessible baffles and lids, and checking for leaks or cracks. In Rochester, accessible tanks and longer drive times can affect price.
  • Rochester cost range: typically $250–$500, depending on tank size (1,000–1,500 gallons common for single-family homes) and ease of access.
  • Rochester notes: regular pumping is a cornerstone of system longevity; many local households plan every 3 years, with more frequent service for larger families or complex systems.

Septic System Inspections (Routine)

  • What it includes: visual inspection of tanks and lids, baffles, sludge depth, draniage indicators, and overall condition; basic dye test and/or camera inspection if requested; written report with recommendations.
  • Rochester cost range: $300–$600 for a comprehensive evaluation; more if camera work or dye testing is added (up to $900 in some cases).
  • Rochester notes: real estate transactions in Rochester often require a formal septic clearance; inspectors familiarize themselves with local code expectations.

Real Estate / Pre-Purchase Septic Inspections

  • What it includes: focused assessment of the current system's function, leak indicators, drainfield status, and a detailed report for buyers and sellers. Often paired with a dye test or limited camera inspection.
  • Rochester cost range: $350–$650.
  • Rochester notes: lenders and the Sangamon County health department frequently rely on these inspections as a condition of closing.

Drain Field Evaluation and Repair

  • What it includes: locating drainfield trenches, assessing soil absorption, checking for wet or soggy areas, and performing targeted repairs such as line cleaning or replacing damaged components.
  • Rochester cost range: $2,000–$7,000 for targeted field work; larger or more invasive fixes can run higher.
  • Rochester notes: soil types and groundwater proximity in parts of Rochester can influence repair approach and timeline.

Drain Field Replacement

  • What it includes: full replacement of the leach field or mound system when the existing area is failing; may require soil tests, updated trench designs, and permits.
  • Rochester cost range: roughly $6,000–$25,000 for conventional replacements; mound or highly engineered systems can exceed $30,000.
  • Rochester notes: local regulations and site constraints (soil depth, groundwater, setbacks) strongly affect project scope and cost.

Septic Tank Baffle Replacement and Riser/Lid Installation

  • What it includes: replacing deteriorated or cracked baffles, upgrading lids for safer access, and installing risers to simplify future maintenance.
  • Rochester cost range: $300–$1,500.
  • Rochester notes: adding risers is common in Rochester to reduce future digging and improve inspection access.

New Septic System Installation and Permits

  • What it includes: site evaluation, soil testing, system design, permit coordination, drainage planning, installation, and initial start-up.
  • Rochester cost range: conventional systems typically $8,000–$20,000; more complex or mound systems can be $15,000–$40,000+.
  • Rochester notes: permits and inspections from the Illinois Department of Public Health and Sangamon County Health Department drive timelines and costs.

Advanced Treatment Units (ATU) Maintenance and Grinder Pump Service

  • What it includes: routine service for ATU/irrigation systems, grinder pump inspections, part replacement as needed, and startup checks after service.
  • Rochester cost range: ATU maintenance $200–$500 per visit; grinder pump service $400–$1,200 depending on work required.
  • Rochester notes: newer or upgraded homes may rely on ATUs or grinder pumps; locally, these require specialized technicians.

Emergency Septic Pumping and 24/7 Service

  • What it includes: prompt pumping, situational inspection, and short-term remediation to prevent backups; after-hours fees may apply.
  • Rochester cost range: $350–$800, influenced by time, distance, and urgency.
  • Rochester notes: Rochester providers often offer rapid response for backups during winter weather or heavy rain events.

Jetting/Line Cleaning and Camera Inspection

  • What it includes: high-pressure line jetting to clear blockages, followed by camera inspection to locate defects or failures; included or optional depending on package.
  • Rochester cost range: jetting $300–$600; camera inspection $150–$300.
  • Rochester notes: camera verification helps pinpoint issues in tight Rochester lots or older plumbing runs.

Maintenance Plans and Annual Servicing

  • What it includes: scheduled pump-outs, inspections, filter checks, and priority access for service calls; discounts for multi-service plans.
  • Rochester cost range: $150–$600 per year depending on level of service and number of visits.
  • Rochester notes: establishing an annual plan can optimize performance and budgeting for Rochester homeowners.

Official resources

  • Illinois Department of Public Health – Onsite Wastewater Treatment Systems (OWTS) program:
  • U.S. Environmental Protection Agency – Onsite Wastewater Treatment Systems: