Septic in Westfield, IN

If you've driven around Westfield lately, you've likely seen neighborhoods blossoming with new homes while quiet, older streets remind you this is a place where practicality meets big growth. Here in Westfield, septic systems are a familiar part of home ownership, not an odd exception. When a home isn't connected to a centralized sewer line, a private septic system is the usual setup that keeps the house comfortable and functional.

Is septic common in Westfield? Should I expect septic if I own or buy a home? Yes. Septic systems are still very common in Westfield, especially in older rural pockets and in newer developments where sewer lines haven't reached every street yet. If a home isn't tied to the city sewer, you'll typically have a private septic system. When you're shopping for a home, expect to see a septic permit, a recent inspection, or a pumping record as part of the disclosures. To make your decision easier, consider these quick checks:

• Plan to secure a professional septic inspection as part of your purchase.
• Ask about the system type (conventional, mound, or alternative) and the last pump date.
• Budget for ongoing maintenance: pumping every 3-5 years is common, though your system may differ.
• Be aware of drain-field health, setbacks, and nearby wells.

Why do homes use septic systems in Westfield? High-level explanation: Westfield's growth pattern—lots of wide lots in some areas and pockets where central sewer expansion is still catching up—made septic a practical, cost-effective choice long before every street was tied to a sewer main. Some neighborhoods now have sewer, others don't, so private onsite systems continue to serve many properties. In short, on-site systems were the natural solution for many Westfield homes, and they remain common today.

A quick overview of what this means in practice: a typical system includes a buried tank, a drain field, and regular maintenance. To keep things running smoothly, minimize water use, avoid chemical drain cleaners, and plan for professional pumping on a regular schedule. Watch for signs like slow drains, gurgling toilets, wet spots in the yard, or strong wastewater odors, and call a local septic pro if anything seems off.

As your neighbor and a local septic contractor, I'm here to help you make practical, confident decisions—about choosing a contractor, scheduling maintenance, and staying ahead of issues. Let's start with the basics you can check today.

Where Septic Systems Are Common in Westfield

Areas Outside the City Sewer Service Area

In Westfield, septic systems are most common in the outskirts where municipal sewer lines haven't been extended yet. These areas typically feature lower-density housing, larger lot sizes, and properties that were developed before a city-wide sewer network existed. Private septic is a practical solution when extending sewer infrastructure would be expensive or unlikely in the near term.

• Rural residential pockets in the western and northern fringes.
• Unincorporated sections within Westfield's planning vicinity that rely on private wastewater disposal.
• Homes located far from main sewer corridors or existing sewer mains.

Older Neighborhoods and Subdivisions

Many homes built before sewer expansion relied on septic systems, and some older neighborhoods continue to operate on private wastewater disposal. As Westfield grew, some blocks were connected when sewer service was extended, but others still depend on septic today. Homeowners in these areas should routinely assess wastewater performance and maintenance needs.

• Pre-1970s and early-subdivision layouts with larger lots and space for drain fields.
• Subdivisions planned in fringe areas where sewer service arrived later.
• Homes that cannot be economically or physically connected to a distant sewer main.

Soil, Drainage, and Lot Size Factors

The suitability of a septic system depends a lot on soil and lot characteristics. Westfield's property parcels range from soils that drain well to those with heavier clay or restrictive groundwater near the surface. This variability drives decisions about system type, maintenance, and whether sewer connection might be a smarter long-term choice.

• Soil tests and percolation rates determine whether a conventional or alternative system is best.
• Drain-field size and configuration must fit the lot and setback rules.
• Water table depth, slope, and proximity to wells or streams affect design and placement.
• Lot size matters: many Westfield homes have space for drain fields, but some smaller parcels require engineered designs or sewer hookup alternatives.

How to Confirm Status and Plan Ahead

If you're unsure whether your Westfield home uses septic or is connected to sewer, a quick check and a proactive plan can save trouble later.

• Step 1: Check with City of Westfield Utilities or your county's maps to confirm sewer service status for your property.
• Step 2: If you're on septic, schedule a baseline septic system assessment with a licensed contractor or the Hamilton County Health Department to establish current condition and future maintenance needs.
• Step 3: Review local and state guidelines for septic system design, maintenance intervals, and replacement options (IDEM and local health authorities provide guidance).
• Step 4: Plan for maintenance, recordkeeping, and potential upgrades, especially if you foresee changes to property use, lot boundaries, or nearby development.

Official Resources

• City of Westfield Utilities - Sewer and service information:
• Indiana Department of Environmental Management (IDEM) – On-Site Wastewater Systems:
• Hamilton County Health Department – On-site wastewater programs and guidance:

Septic vs Sewer: What Homeowners in Westfield Should Know

How a septic system works

Your home's septic system is a small, local treatment plant buried in your yard. It has two main parts: a septic tank and a drainfield. Wastewater from sinks, toilets, and laundry flows into the tank, where solids settle to the bottom and fats float to the top. Liquids (effluent) flow out to the drainfield, where soil and naturally occurring microbes finish the job.

• Septic tank: stores and begins breaking down solids; regular pumping prevents buildup.
• Drainfield: distributes effluent into the soil, where bacteria and roots help filter contaminants and the water returns to groundwater safely.
• What maintenance buys you: a well-functioning system means fewer backups, less expensive repairs, and longer life for the drainfield.

How a municipal sewer works

In sewered areas, your home connects to a network of underground pipes owned by a city or county. Wastewater is carried to a central treatment plant, treated, and discharged or reused according to local rules. Your sewer service is usually billed monthly or bi-monthly based on water use, not just the number of flushes.

• Shared responsibility: blockages and sewer overflows can affect multiple properties.
• Routine maintenance: utilities clean, repair, and monitor the public system; homeowners aren't typically responsible for drainfield care.
• If you're on sewer, you won't pump a septic tank, but backflow and sewer backups can still cause problems that require attention.

Westfield-specific considerations

Westfield sits in a growing area with a mix of service types. Some homes are on private septic systems, others connect to municipal sewer as development expands. To know your exact setup, confirm with your property records and your local utility.

• Common questions:
  • Is a septic tank present on my lot? Is there a city sewer line near my property?
  • What are the local requirements if I later connect to sewer?
• How to confirm:
  1. Check your most recent utility bill or tax records for "sewer" vs. "septic."
  2. Look up your parcel in the county GIS or contact the City of Westfield or Hamilton County public works for service type.
  3. If you're considering a change, budget for both connection costs and potential septic abandonment costs.

Maintenance basics for septic owners

A little regular care goes a long way.

• Pump every 3-5 years (family size and tank size matter; consult a licensed contractor).
• Use water efficiently: fix leaks, spread out laundry, and avoid garbage disposals as a daily habit.
• Protect the drainfield: keep vehicles and heavy equipment off, plant only shallow-rooted vegetation nearby.
• Avoid flushing risky items: grease, solvents, pesticides, wipes labeled flushable—even "flushable" products cause trouble.
• Do a simple annual check: record pumping dates, inspect for standing water or lush grass over the drain area, and listen for gurgling drains.

Signs of trouble and what to do

• Slow drains, repeated backups, or gurgling sounds.
• Wet patches or odors over the drainfield.
• Cracks in the foundation or toilets that occasionally back up.
• If you notice these, contact a licensed septic professional promptly to assess, diagnose, and avoid more extensive repairs.

When to connect to sewer vs keep septic

1. If a sewer line is planned or available near your property, weigh the cost of connecting against ongoing septic maintenance and potential tank/drainfield replacements.
2. Consider the age and condition of your current system and your local regulations regarding abandonment or removal.
3. If local authorities require abandonment of a septic when connecting to sewer, follow the approved process to prevent groundwater contamination.

Official resources

• Indiana Department of Environmental Management (IDEM): Onsite Wastewater Systems.
• U.S. EPA: Septic Systems. and your Hamilton County or Westfield Utilities pages for service availability and connections.

Typical Septic System Types in Westfield

Conventional gravity septic systems

• What it is: The workhorse of residential septic, used where soils drain well and the groundwater table isn't too high.
• Components: a buried septic tank and a drainfield with perforated pipes (often in trenches with gravel or other media).
• How it works: solids settle in the tank; clarified liquid exits to the drainfield and percolates through the soil for treatment.
• When it's right: proven in many Westfield yards with good soil conditions and adequate depth to groundwater.
• Pros/cons: simple, reliable, and cost-effective upfront; limited by soil percolation and groundwater, and can fail if the drainfield is overloaded or poorly drained.
• Maintenance tips: have an inspection every 3 years or per local guidance; pump every 3–5 years depending on usage; protect the drainfield from heavy loads and avoid flushing grease, chemicals, or non-dissolved wipes.

Aerobic treatment units (ATU) and other advanced pretreatment

• What it is: compact, energy-using systems that add oxygen to boost bacteria, producing a higher-quality effluent before it reaches the drainfield.
• When used: helpful where soils are shallow, slowly draining, or groundwater is close to the surface; can work in smaller lots.
• How it works: an aerobic chamber treats wastewater, sometimes followed by disinfection before discharge to the drainfield.
• Pros/cons: higher treatment efficiency and more flexibility in challenging soils; higher operating costs and more routine maintenance; requires electricity and service contracts.
• Maintenance: regular service by a licensed professional; keep the control panel and components clean; replace filters as recommended.

Mound systems

• Why you'd see them: used when native soil can't absorb effluent due to shallow soils, high groundwater, or restrictive conditions.
• What you'll find: an elevated mound built with imported soil, plus a dosing tank, lift/pump, and an above-ground drainfield.
• How it works: effluent is pumped to the mound for absorption at a controlled rate.
• Pros/cons: expands usable space on difficult sites; higher upfront and ongoing maintenance costs; more components to manage.
• Maintenance: monitor pump performance and soil moisture; schedule inspections and pump-outs per the design.

Sand filter systems

• What they are: a secondary treatment option using a covered sand filtration bed to further clean effluent before reaching the drainfield.
• When used: appropriate for marginal soils or when extra treatment is desired.
• Pros/cons: excellent effluent quality; more parts to maintain and a higher overall cost; still depends on a suitable drainfield below.
• Maintenance: keep filters clean and verify headloss; professional service for periodic checks.

Pressurized distribution and drip irrigation

• How it works: pumped, pressure-dosed effluent is distributed through smaller lines across the absorption area.
• Pros/cons: more uniform dosing and better performance on difficult soils or tight lots; higher design and installation costs; requires careful winterization and ongoing maintenance.

Holding tanks and cesspools

• What you'll encounter: older homes or specific redevelopment projects may use holding tanks or cesspools.
• Key note: these are not substitutes for a functioning drainfield where allowed; they require regular pumping and proper disposal, and many areas restrict new installations.

Choosing the right system for your Westfield property

1. Start with a soil and site evaluation (soil type, depth to groundwater, slope, drainage).
2. Check permits and local requirements with IDEM and your county health department (IDEM:
3. Engage a licensed onsite wastewater professional to design and size the system for your home.
4. Plan for ongoing maintenance and long-term costs, including regular inspections and pumping.

Maintenance and regulations (brief)

• Routine inspections and pumping help protect your system and local water resources.
• Official guidance: IDEM Onsite Wastewater and EPA septic resources for general best practices: IDEM EPA https://www.epa.gov/septic.

Common Septic Issues in Westfield

Drainfield saturation from heavy rainfall and soils

Westfield soils vary, and some neighborhoods sit on clay or have shallower water tables than ideal for septic drainage. After heavy rains, snowmelt, or rapid spring recharge, the drainfield can become saturated, slowing treatment and pushing effluent closer to the surface. Symptoms include soggy spots in the yard, sewage odor near the drainfield, and toilets that take longer to flush.

• Why it happens in Westfield: clay soils and seasonal groundwater can limit absorption, and recent development can compact soils, reducing pore space.
• What to do now:
  1. Conserve water during wet periods (spread laundry over days, avoid long showers).
  2. Limit vehicle or heavy equipment traffic over the drainfield area.
  3. Schedule an evaluation with a licensed septic professional to assess absorption and consider pumping or system adjustments if needed.

Tree roots and landscaping encroaching on the drainfield

Root intrusion is a commonWestfield issue because mature landscaping often extends near septic components. Roots can crack pipes, clog lines, and reduce the drainfield's ability to absorb effluent.

• Signs to watch for: slow drains, gurgling sounds, damp or lush patches above the drainfield, or newly exposed effluent due to root damage.
• What to do:
  1. Keep trees and large shrubs at a safe distance from the drainfield and the septic tank.
  2. Have a licensed pro inspect for root intrusion and recommend repair or rerouting if needed.
  3. Install root barriers or replace impacted pipes with root-resistant materials when advised.

Aging or undersized systems for Westfield homes

Many older Westfield homes were designed with smaller drainfields or aging tanks that can struggle as occupancy grows or usage patterns change.

• Risks: backups, foul odors, and potential contamination risks if the system can't handle current loading.
• How to address:
  1. Obtain a professional assessment of tank integrity, baffles, and field performance.
  2. Pump and clean to remove built-up solids, then repair or redesign components as recommended.
  3. Consider upgrading to a larger or properly designed system if the current setup is undersized for the lot and household.

Tank and baffle failures

If inlet/outlet baffles or tank seams fail, solids can pass into the drainfield, causing clogs and premature field failure.

• Common indicators: standing water above the tank, backed-up fixtures, or sludge in the outlet line.
• What to do:
  1. Have the tank inspected for baffle integrity.
  2. Replace damaged baff es and verify proper flow direction.
  3. Schedule a drainfield assessment to determine if field recovery or replacement is needed.

Flushing non-biodegradable waste and poor maintenance habits

Flushing wipes, feminine products, fats, oils, and chemicals disrupt microbial activity and clog drain lines or tanks.

• Practical steps:
  1. Only flush toilet paper; dispose of wipes and feminine products in the trash.
  2. Avoid pouring fats, oils, solvents, pesticides, or harsh cleaners down drains.
  3. Schedule regular pumping and inspection per local guidelines.

Irrigation and outdoor water use near the drainfield

Lawn irrigation, sump pumps, or drainage systems placed too close to the drainfield can saturate or flood the absorption area.

• What to do:
  1. Re-route sprinklers and outdoor water lines away from the drainfield.
  2. Direct groundwater drainage away from the system during wet seasons.
  3. Have a professional map the system and confirm safe setbacks.

Seasonal flooding and groundwater pressures

Indiana's climate brings heavy rain and potential localized flooding. In Westfield, standing water or perched groundwater near the system during certain seasons can compromise performance.

• Action plan:
  1. Monitor after heavy storms and reduce water use if surface indicators appear.
  2. Have a pro inspect for structural issues and drainage adequacy.
  3. Consider long-term field improvements if frequent saturation recurs.

Official resources:

• EPA: Septic Systems and Maintenance —
• Westfield local government (for local guidelines and permits) —

Septic Inspection, Permits & Local Oversight

Local oversight in Westfield, IN

In Westfield, onsite wastewater systems are overseen through a mix of state guidance and local administration. The Indiana Department of Environmental Management (IDEM) sets statewide design and environmental standards, while local health and building authorities handle permits, inspections, and adherence to area-specific rules. Because Westfield sits in Hamilton County, the county health/health department typically coordinates onsite wastewater permits and inspections in conjunction with IDEM. For the most current requirements, check IDEM's Onsite Wastewater program and your local city resources.

• Official IDEM resource: Onsite Wastewater Program

Permits and inspections you may need

Most work on a septic system requires permitting and inspections, from installation to substantial repairs. Expect county health involvement, and in some cases city guidance through Westfield's building-related departments.

• Common permit types
  • New septic installation: design approval, site evaluation, and a construction permit.
  • Repairs or replacements: repair/replacement permit for the system portion being worked on.
  • Disconnects or conversions: if you switch to municipal sewer, or disconnect from the septic system, a permit and final inspection may be required.
  • Home sale disclosures or changes: lenders or inspectors may request a current septic inspection as part of the closing process.
• Steps to follow
  1. Contact IDEM and your local officials (city and county) to confirm which permits apply to your project.
  2. Obtain the necessary permit(s) before any work begins.
  3. Schedule inspections at key milestones (pre-doot and after installation, final inspection).
  4. Keep all permit records and as-built drawings for future maintenance.

Scheduling an inspection

Inspections are typically tied to construction milestones and as-built milestones. Plan ahead and coordinate with the applicable agency before digging or commencing work.

• Practical steps
  • Call early to reserve inspection slots; some programs have seasonal workloads.
  • Have prepared plans on hand: site diagram, tank layout, absorption area details, and any prior permits.
  • Mark utilities and access points to ensure safe, efficient inspections.

What inspectors look for

A standard septic inspection covers both the physical system and its site conditions to ensure long-term performance and safety.

• Tank and components
  • Tank integrity, proper baffle installation, accessible lids, and condition of pump or dosing chambers.
  • Adequate effluent filters and cleanouts; verify proper venting and pipe connections.
• Soil absorption area
  • Condition of the drainfield or mound, soil compaction, and evidence of effluent failure or surface dampness.
  • Adequate separation from wells, streams, and structures; correct grading and drainage.
• System connections and drainage
  • Correct pipe sizing, proper risers and covers, and absence of surface inflow or tree root intrusion.
  • Erosion control and surface water management around the system.

Recordkeeping and maintenance

After inspections, keep all permits, inspection reports, and as-built drawings in a safe place. Ongoing maintenance (pump outs, filter cleaning, and leak checks) helps preserve system life and simplifies future inspections or selling your home.

• Maintenance basics
  • Schedule regular professional pump-outs per your system's design (frequency depends on usage and tank size).
  • Maintain access risers and lids; ensure clear labeling for future owners.

Resources

• IDEM: Onsite Wastewater Program

Septic Maintenance for Homes in Westfield

Regular maintenance schedule

A regular maintenance schedule keeps your system healthy and helps prevent costly repairs, especially in Westfield's variable soils and wetter springs.

• Pumping interval: 3-5 years, depending on tank size and household usage.
• Inspections: have a licensed septic professional inspect every 1-3 years.
• Records: maintain a maintenance log with pump dates, tank size, and service notes.
• Component checks: request baffle inspections and confirm lids, risers, and accessibility are in good condition.

Westfield-specific considerations

Westfield homes sit in a mix of soil types and experience seasonal rainfall that can affect drainfield performance. Heavy rains and high water tables can saturate drainfields, increasing the risk of backups during wet spring months. Tree roots and large shrubs near the system can damage lines or clog flows.

• Site care: avoid driving or placing heavy objects on the drainfield area; keep landscaping and septic components accessible for maintenance.
• Planting guidelines: choose shallow-rooted plants away from the septic area to reduce root intrusion.
• Local oversight: Westfield residents typically work with the Hamilton County Health Department for onsite wastewater permits and inspections. For state-wide guidance, refer to EPA resources and ISDH materials linked below.

Routine care and best practices

Small daily habits add up to a healthier system and fewer problems in Westfield workshops and yards.

• Water use: spread out laundry loads, fix leaks, and install high-efficiency fixtures to reduce load on the system.
• Waste disposal: only human waste and toilet paper go into toilets; avoid flushing wipes, medications, coffee grounds, or fats and oils.
• Chemicals: minimize harsh cleaners and chemical drain cleaners; use septic-safe products when possible.
• Kitchen practices: consider a compost bin for yard waste; dispose of grease and oils in designated containers rather than the septic system.
• Maintenance products: discuss with your septic pro before adding any enzyme or bacterial products; some households benefit from approved maintenance programs, but not all additives are necessary.

Signs of trouble and steps to take

Early detection saves money and avoids environmental impact. Watch for:

• Odors around drains, toilets, or the yard; slow drains; gurgling sounds in plumbing.
• Wet, lush patches or mud on the drainfield area indicating possible saturation.
• Backups in sinks or toilets after multiple use cycles.

If you notice trouble:

1. Minimize water use across the home.
2. Contact a licensed septic contractor or the Hamilton County Health Department to assess conditions and schedule service.
3. Arrange pumping and a drainfield evaluation as recommended by the pro.
4. After service, follow the pro's long-term maintenance plan to prevent recurrence.

Local resources and references

• EPA Septic Systems:

Cost Expectations for Septic Services in Westfield

Septic Tank Pumping / Cleaning

• What's included: removal of accumulated solids from the main tank, inspection of baffles and lid seals, basic disposal of waste, and a brief assessment of tank condition.
• Westfield-specific notes: older or heavily used systems may require more frequent pumping; accessible tank lids and driveways can affect cost.
• Typical Westfield cost: roughly $250–$500 per pumping, higher if the tank is larger or access is difficult.
• Official resources: IDEM Onsite Wastewater Systems overview (regulatory context and permitting)

Septic System Inspection and Certification

• What's included: visual tank inspection, measurements of scum and sludge layers, evaluation of baffles and pumps, assessment of drain field condition, and a written report. Often required for home sales.
• Westfield-specific notes: lenders and insurers in Westfield commonly require a current septic inspection during real estate transactions.
• Typical Westfield cost: $200–$350; add-ons like dye testing or camera inspection may increase the price.
• Official resources: EPA septic system information and consumer guidance https://www.epa.gov/septic

Drain Field Evaluation / Soil Testing

• What's included: soil evaluation, percolation testing (if a new system is planned), drain field layout review, and recommendations for repair or replacement.
• Westfield-specific notes: soil conditions in parts of Hamilton County can necessitate alternative drain-field designs (mounds, drip irrigation) for approved systems.
• Typical Westfield cost: $300–$700, depending on lot size, access, and required tests.
• Official resources: IDEM guidance on onsite wastewater design and permitting https://www.in.gov/idem/waste-management-programs/onsite-wastewater-systems/

New System Installation

• What's included: site evaluation, design, permitting, trench or mound construction, system components (tank, drain field, distribution, pump if needed), and final commissioning.
• Westfield-specific notes: permitting through City of Westfield and local health/regulatory authorities; lot size, setbacks, and soil type influence the design and price.
• Typical Westfield cost: $10,000–$40,000 for conventional systems; $25,000–$60,000+ for mound or advanced treatment systems.
• Official resources: City of Westfield permits and inspections page; IDEM onsite wastewater permitting guidance https://www.in.gov/idem/waste-management-programs/onsite-wastewater-systems/

Drain Field Replacement / Leach Field Repair

• What's included: excavation and removal of failing components, replacement of drain field trenches, soil compaction, and system re-commissioning.
• Westfield-specific notes: cost can be higher where space is limited or access is tight; local soil and groundwater conditions influence design.
• Typical Westfield cost: $7,000–$20,000+, depending on field size and soil conditions.
• Official resources: IDEM onsite wastewater guidelines and local permit requirements https://www.in.gov/idem/waste-management-programs/onsite-wastewater-systems/

Minor Repairs and Component Replacement

• What's included: replacement of pumps, floats, lids, risers, check valves, or damaged baffles; often a fix that restores function without a full replacement.
• Westfield-specific notes: access to the tank and proximity to driveways or landscaping can affect labor time.
• Typical Westfield cost: $300–$1,600 based on part and labor.
• Official resources: EPA consumer guidance on shared components and maintenance https://www.epa.gov/septic

Camera Inspection and Diagnostic Services

• What's included: video inspection of pipes and joints, locating lines, identifying breakages or blockages, and documenting findings for repair planning.
• Westfield-specific notes: useful when drain lines are hard to access or when preparing for field replacement.
• Typical Westfield cost: $150–$600 for a camera run; trenchless repairs may add to the bill.
• Official resources: EPA septic system basics and maintenance tips https://www.epa.gov/septic

Maintenance Planning and Regular Maintenance

• What's included: customized maintenance schedules, recommended pumping intervals, and reminders to prevent failures.
• Westfield-specific notes: local climate and soil moisture patterns can shift optimal pump frequencies; a plan helps avoid costly emergencies.
• Typical Westfield cost: $100–$300 annually for ongoing maintenance plans or one-time assessments.
• Official resources: IDEM and EPA guidance on preventive maintenance https://www.in.gov/idem/waste-management-programs/onsite-wastewater-systems/ and https://www.epa.gov/septic

Emergency / After-Hours septic service

• What's included: rapid diagnostic, surge labor, and urgent repairs to prevent overflow or contamination.
• Westfield-specific notes: winter weather and access in some neighborhoods can impact response times.
• Typical Westfield cost: service call often $100–$250, plus parts and repair labor.

Dye Test for Real Estate Transactions

• What's included: dye flush in the system to confirm proper flow and absence of obvious leaks or bypasses.
• Westfield-specific notes: commonly requested during real estate closings; may be bundled with a standard inspection.
• Typical Westfield cost: $100–$250.
• Official resources: EPA consumer guidance on septic system inspections and tests https://www.epa.gov/septic

Tank Abandonment / Decommissioning

• What's included: safe filling, removal or sealing of an unused tank, and temporary soil stabilization.
• Westfield-specific notes: required when a property never uses an old tank or when selling a home with an inactive system.
• Typical Westfield cost: $600–$2,000 depending on tank size and location.
• Official resources: IDEM on decommissioning onsite wastewater systems https://www.in.gov/idem/waste-management-programs/onsite-wastewater-systems/