Septic in Antioch, CA

In Antioch, you'll notice a mix of setups: some streets feed straight into the public sewer, while other parcels—especially on larger lots or toward hillside and rural areas—rely on on-site septic systems. If you're new to the area or shopping for a home here, you'll want to know what kind of wastewater treatment your property uses. A quick check now can save you surprises later.

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

Yes, septic is common in parts of Antioch, particularly on larger parcels, hillside blocks, or areas farther from mature sewer mains. In more urbanized neighborhoods and newer developments, homes are typically connected to public sewer, but that isn't universal. If you're buying a home, ask the listing or your inspector whether the property is on sewer or septic, and request the septic permit and service history if applicable. If a system is present, have a licensed pro verify tank size, recent pumping, and the health of the drain field. Getting ahead of this can prevent costly surprises after you move in.

Why homes typically use septic systems in Antioch

• Feasibility and cost: Extending sewer lines to distant or lower-density parcels can be expensive and logistically challenging. Septic on-site provides a practical alternative.
• Soil and site conditions: Antioch's varied soils—clay, sandy, and loamy soils—mean that some lots are better suited to on-site disposal and treatment than others. A properly designed septic system accounts for percolation, depth to groundwater, and drainage patterns.
• Growth patterns and regulations: In areas where centralized sewer isn't immediately accessible, on-site systems have supported development while meeting local health and environmental standards.
• Water management and drought considerations: On-site treatment reduces reliance on extended sewer mains and can align with California's water-conscious planning.

High-level explanation (why septic exists here)

Historically, Antioch's outward growth often occurred where sewer mains hadn't yet, or wouldn't, reach promptly. On-site septic systems offered a practical, economical way to support homes on those parcels while communities built out their infrastructure. Today, that mix continues: some streets and neighborhoods are fully sewer-enabled, while others continue to rely on reliable, well-maintained septic systems. Regular maintenance and proper design remain key to keeping systems safe and effective.

Let's walk through what that means for your Antioch home.

Where Septic Systems Are Common in Antioch

Core urban neighborhoods

In many central-area homes, public sewer service is the norm, but pockets exist where septic systems are still used. These tend to be older blocks or parcels that sit a bit beyond the main sewer lines or where extending mains hasn't been practical or cost-effective. If your lot is farther from a sewer trunk or has unique lot configurations, a septic system may still be in use.

• Older subdivisions built before full sewer expansion
• Parcels with limited frontage or awkward lot shapes
• Areas historically served by septic due to utility planning timelines

Rural fringes and hillside areas

Antioch's outskirts, including hillside and rural zones, rely more on septic because gravity sewer connections are harder to install and maintain. Steeper terrain or shallow soils can make extending sewer lines expensive or technically challenging, so many properties in these zones continue to use on-site systems.

• Hillside neighborhoods and unincorporated outskirts
• Properties with limited access to main sewer mains
• Rocky or shallow-soil areas where drain fields perform best on-site

Newer developments vs. older service areas

As new neighborhoods are brought into municipal service, septic use declines there. However, in areas where sewer expansion hasn't caught up or isn't planned soon, septic remains a common, long-term option.

• Developments within current sewer boundaries often connect to sewer
• Areas outside or near the edge of sewer plans may still rely on septic
• Long-term planning may influence future hookups and replacements

How to verify what you have on your property

If you're unsure whether your home uses septic or sewer, use these practical checks.

1. Check property records or your permit history for wastewater details.
2. Look for a buried septic tank lid or access covers in the yard, or signs of a drain field (lush, evenly green vegetation, patches in specific areas).
3. Review your utility bills or any notices from the city or county about sewer connections or replacements.
4. Contact Contra Costa County Environmental Health if you need official confirmation or records.
5. Contra Costa County Environmental Health – Onsite Wastewater Systems:
6. California State Water Resources Control Board – Onsite Wastewater Treatment Systems:

Common system types you'll see here

• Conventional septic tank with a drain field
• Gravity-fed or pressure-dosed drain fields
• Sand mound or other alternative drain field systems in challenging soils
• Infrequently, cesspools (rare and typically replaced)

Septic vs Sewer: What Homeowners in Antioch Should Know

Is your home on septic or sewer? How to tell

The easiest way is to verify with bills and local records. If your home is on municipal sewer, you'll see a separate "Sewer" or "Wastewater" charge on your monthly bill. If you have a septic system, you won't receive a sewer bill and maintenance is managed on-site and through the county.

• Check the most recent utility bill for a sewer/wastewater line item.
• Look at property tax or escrow statements for a sewer charge.
• Contact the City of Antioch Public Works or Contra Costa County Environmental Health to confirm your service type.
• Look for on-site evidence (without digging): a septic tank lid or access in the yard indicates a septic system; lack of a visible sewer lateral can suggest sewer service, but confirm with authorities.

Septic vs Sewer: How they work

• Septic system (on-site): Waste travels from your home to a septic tank, then to a drain field. It's managed on your property and requires periodic pumping and inspection.
• Municipal sewer: Waste is sent to a centralized treatment plant. You're billed by the city or county for sewer service, and on-site maintenance is usually limited to the house's plumbing until the main sewer line.

Pros and considerations

• Septic: greater on-site control; lower monthly utility bill (no sewer charge); requires regular pumping and field maintenance; failures can be expensive and disruptive.
• Sewer: no on-site drainage field to maintain; predictable monthly cost; if the system fails, it's the utility's responsibility up to the main; occasional repairs to home drains or lateral connections may be needed.

Local considerations for Antioch homeowners

Antioch sits within Contra Costa County. Some neighborhoods are connected to a municipal sewer system; others rely on septic systems, particularly in less densely developed areas or outside the city limits. Verify your status with local authorities to understand required maintenance, permitting, and any future sewer expansion plans.

• If you're on sewer: know your service area and backflow protection requirements from the city or county.
• If you're on septic: remain compliant with local permitting, pumping schedules, and drain-field care to protect your system and groundwater.
• Selling or purchasing a home: disclose whether a septic or sewer system serves the property, along with recent pumping or inspections.

Maintenance and inspection basics

• Septic maintenance: pump every 3–5 years (spread depends on tank size and household usage); have the system inspected by a licensed professional every 1–3 years; use water efficiently; avoid flushing grease, solvents, or non-biodegradable products; landscape to avoid tree roots near the drain field.
• Sewer maintenance: keep interior plumbing and the main sewer line clear; fix leaks promptly; install and maintain backflow prevention devices where required; avoid dumping fats, oils, and non-flushables down drains, which can affect the public sewer system and your property.

When to connect to sewer or replace a failing septic

1. You notice persistent backups, gurgling drains, sewage odors, or wet areas in the drain field—these are signs of a failing septic or overloaded drain field.
2. Contact your local sewer authority or City of Antioch/Public Works to discuss connection options and costs.
3. Have a licensed septic contractor evaluate the system if you're considering repairs or replacement. Obtain a formal cost estimate for pumping, repairs, or field replacement.
4. Weigh costs and benefits: connecting to sewer may be more reliable long-term, while a failing septic can sometimes be repaired with pumping or field replacement if feasible.

Official resources and quick links

• California State Water Resources Control Board – Onsite Wastewater Treatment Systems (OWTS):
• Contra Costa County Environmental Health – Onsite Wastewater Systems:
• California Department of Public Health – Onsite Wastewater Program:
• U.S. EPA – Septic Systems: https://www.epa.gov/septic

Typical Septic System Types in Antioch

Conventional gravity septic system

• How it works: wastewater from the home flows by gravity into a septic tank, where solids settle and a clearer liquid exits to the drainfield through a distribution box or simple gravity lines.
• Typical components: one or more septic tanks, a distribution box, and a drainfield (leach field) with perforated pipes in a soil absorption area.
• When it's a good fit: well-draining soil, adequate drainfield footprint, and flat or gently sloping sites.
• Pros: lowest upfront cost among common systems, straightforward design, easy to service.
• Cons: relies on soil absorption; performance drops if the soil percs slowly, groundwater is high, or the drainfield is constrained.
• Maintenance basics:
  • Schedule a professional inspection every 1–3 years and a septic tank pump every 3–5 years (or per local guidance).
  • Conserve water to keep lot's load manageable.
  • Avoid flushing or draining non-biodegradable or high-fat wastes.

Pressure distribution septic system

• How it works: a small pump sends wastewater to multiple trenches evenly, rather than relying on gravity to distribute effluent.
• When it's a good fit: soils with shallow depth to bedrock, high soil clog potential, or limited gravity capacity.
• Key components: lift/pump tank, control panel, dosing chamber, pressure distribution lines, and a drainfield network.
• Pros: more uniform effluent distribution, can improve drainfield performance on marginal soils.
• Cons: higher initial cost and ongoing electrical/pump maintenance.
• Maintenance basics:
  • Verify the pump and timer are functioning regularly.
  • Have the system professionally serviced per the manufacturer's and local authority's schedule.
  • Avoid chemical cleaners and grease buildup that can affect pumps.

Mound system (raised drainfield)

• Why it's used: when native soil is too shallow, water table is high, or the site cannot support a conventional drainfield.
• How it works: an elevated drainfield built on a mound of sand fill, with distribution lines buried in the mound and a cover soil atop.
• Pros: expands usable sites and helps with effluent treatment when soil conditions aren't ideal.
• Cons: more complex, larger footprint, higher maintenance and monitoring demands.
• Maintenance basics:
  • Keep access risers clear for inspection.
  • Avoid heavy traffic on the mound and vegetation that could compact the soil.
  • Regular professional checks for dosing, filters, and mound integrity.

Aerobic treatment unit (ATU) with soil absorption

• What it is: a pre-treatment unit that introduces controlled aerobic processes to break down waste before the effluent reaches the drainfield.
• How it works: wastewater goes through an ATU, often with an aerator and disinfection step, then flows to the drainfield for final dispersion.
• Pros: higher quality pre-treatment, can enable smaller or more constrained drainfields, better performance in challenging soils.
• Cons: higher cost, electricity dependence, more frequent service needs.
• Maintenance basics:
  • Service intervals typically every 3 months or as specified by the installer; keep maintenance records.
  • Avoid flushing harsh chemicals, oils, or non-biodegradables that impair the ATU.
  • Ensure power supply and alarms are functioning.

Sand filter systems (secondary treatment)

• How it works: effluent from a primary treatment stage passes through a sand filtration bed, providing additional polishing before reaching the drainfield.
• Pros: improved effluent quality, better performance in soils with limited absorption.
• Cons: more components to monitor and maintain; professional servicing required.
• Maintenance basics:
  • Regular inspections of the sand bed and piping.
  • Periodic pumping of the primary tank and cleaning of filters as recommended.
  • Protect the filter area from compaction and intrusion.

Learn more about official guidance and permitting:

• EPA Septic Systems:
• Contra Costa County Environmental Health resources:
• California Department of Public Health onsite wastewater information:

Common Septic Issues in Antioch

High water table and clay soils that saturate the drain field

• Symptoms to spot: damp soil above the drain field, persistent gurgling noises in plumbing, slow drains, and occasional sewage odors near the drain field, especially after rain.
• Why Antioch is prone: many local soils are clay-heavy, which slows effluent absorption, and winter rains raise the water table, keeping the field wet longer than it can handle.
• What to do (steps):
  1. Have a licensed septic professional inspect the system and perform a drain-field assessment.
  2. Limit water use during wet periods and avoid heavy irrigation directly over the field.
  3. Pump the septic tank on a regular schedule to reduce solids, and consider elevating or relocating the drain field if saturation persists.
  4. If problems continue, explore remedies like an enhanced treatment unit or a alternative drain-field design (mound or at-grade systems) per local code.

Tree roots and landscaping encroaching on the system

• Symptoms to spot: slow drainage, backups in sinks or toilets downstream, cracks or elevation changes in the drain field area, and roots visibly growing toward the system.
• Why Antioch-specific: mature landscaping and trees planted close to the septic area are common; shallow root systems in clay soils can aggressively seek moisture.
• What to do (steps):
  1. Schedule a camera inspection of the septic lines to identify root intrusion.
  2. Prune or remove trees/large shrubs whose roots threaten the lines, or relocate plantings away from the system.
  3. Install root barriers if removal isn't feasible.
  4. If intrusion is severe, a professional repair or replacement of affected pipes may be required.

Aging or poorly maintained tanks and leach fields

• Symptoms to spot: recurrent backups, toilets slow to flush, standing water in the yard over the field, and strong sewage odors.
• Why Antioch-specific: many homes in older neighborhoods rely on aging systems that predate modern maintenance schedules.
• What to do (steps):
  1. Pump the tank and have the baffles inspected to ensure they're intact.
  2. Schedule regular maintenance every 3–5 years (more frequently for large households or high usage).
  3. Avoid putting non-septic-safe items down the drain and limit grease and food waste entering the tank.
  4. If the system is failing, plan for component replacement or field repair with a licensed professional.

Improper disposal practices and solids buildup

• Symptoms to spot: frequent pump-outs, backups after heavy use (laundry, dishwasher), and solids accumulating in the tank.
• Why Antioch-specific: high household water use and disposal habits can accelerate solids buildup in soils with limited absorption.
• What to do (steps):
  1. Use the garbage disposal sparingly and avoid flushing non-flushables, wipes, chemicals, solvents, or oils.
  2. Use septic-safe cleaning products and avoid overusing bleach or harsh chemicals.
  3. Have your tank pumped on a recommended schedule and have solids and scum levels checked during inspections.
  4. Consider upgrades or treatment enhancements if solids are constant problems.

Overloading the system with irrigation and peak-use periods

• Symptoms to spot: sudden backups after watering lawn or running several loads of laundry, gurgling, or slow drains during irrigation season.
• Why Antioch-specific: irrigation demands and seasonal rainfall patterns can overwhelm a system not sized for current usage.
• What to do (steps):
  1. Stagger irrigation and laundry to avoid concurrent heavy loads.
  2. Implement water-saving fixtures and low-flow appliances to reduce daily wastewater volume.
  3. Reassess system sizing if household or landscape changes have increased wastewater.
  4. Have a professional evaluate the drain field capacity and consider adjustments or upgrades if needed.

Official resources and guidance

• California Department of Public Health – Onsite Wastewater:
• U.S. EPA – Septic Systems:
• Contra Costa County Health Services – Onsite Wastewater:

Septic Inspection, Permits & Local Oversight

How oversight works in Antioch

In Antioch, septic system work is regulated primarily through Contra Costa County's Environmental Health (OWTS) program. The county handles permit issuance, plan review, inspections, and compliance to ensure OWTS designs meet state standards and protect groundwater. The City of Antioch coordinates with the county for related building permits and project approvals. For specifics on your project, start with the county's OWTS guidelines and then confirm any city-specific requirements.

Permits you may need

• New or replacement septic system: OWTS permit from Contra Costa County Environmental Health; requires a soils evaluation and a designed system plan by a licensed professional.
• Repairs, modifications, or abandonment: county OWTS permit is typically required.
• Excavation or trenching near the system: may require additional permits or coordination with the city's building/division.
• Connection to public sewer (if available): must abandon the septic system with a permit and final inspection.
• Documentation: keep a copy of approved plans, as-builts, and inspection reports for your records.

Step-by-step: getting an OWTS permit

1. Confirm requirements with Contra Costa County Environmental Health (OWTS).
2. Hire a licensed professional (septic designer/engineer and a licensed contractor).
3. Complete site evaluation and prepare an OWTS design per county standards.
4. Gather required documents (site plan, lot map, existing system info, well location if applicable) and submit to the county with permit fees.
5. County plan review: respond to comments promptly and revise as needed.
6. Permit approval: receive your OWTS permit and schedule installation with your contractor.
7. Inspections and final approval: undergo required inspections during and after installation; obtain final compliance documentation.

What inspectors look for

• Proper setbacks and system placement relative to property lines, wells, structures, driveways, and water features.
• Correct tank type, size, orientation, baffles, and lid access.
• Correct piping connections, venting, and proper backfill of tanks and trenches.
• Leach-field installation integrity: trench width, compacted backfill, and placement of aggregate or fabric as required.
• Accessibility for future maintenance (pumpouts) and clear marking of components.
• Accurate as-built drawings and labeling of system components.

Inspections timeline and process

• Pre-construction inspection: confirms site conditions and layout comply with approved plan.
• During installation: inspectors check tank placement, trenchwork, backfill, and piping as work progresses.
• Post-installation inspection: final review to verify everything matches the approved design; if all good, you'll receive final approval or a request for minor corrections and a re-inspection if needed.

Maintenance, records & local tips

• Regular maintenance is essential. Most residential OWTSs benefit from pumping every 3–5 years, depending on tank size, household water use, and system design.
• Keep all permits, plan sheets, inspection reports, and pump-out receipts in one place.
• Maintain a current as-built drawing and keep contractor contact information handy for future servicing.
• Schedule maintenance and inspections with licensed professionals; never attempt DIY repairs that require permit oversight.
• Watch for warning signs: slow drains, gurgling sounds, sewage odors, damp spots or lush growth over the drain field.

Official resources

• Contra Costa County Environmental Health – On-Site Wastewater Systems (OWTS):
• California Department of Public Health – On-Site Wastewater Systems program:
• City of Antioch (official site for permits and planning): https://www.antiochca.gov/

Septic Maintenance for Homes in Antioch

Understanding Antioch-specific challenges

Antioch sits in a climate and soil mix that can stress septic systems differently than coastal areas. Common local factors include:

• Clay-heavy or mixed soils that slow infiltration, especially in older neighborhoods.
• Seasonal rainfall and groundwater fluctuations that can saturate drain fields during wet winters.
• Proximity to trees and shrubs whose roots may intrude on lines and fields.
• Aging systems in older Antioch subdivisions or homes with historically high wastewater generation.

Maintenance schedule

A practical, Antioch-focused routine keeps systems reliable and compliant.

1. Pump and inspect on a customized schedule
2. Most households pump every 3 years, but actual timing depends on tank size, number of occupants, and water use. Homes with garbage disposals or heavy laundry loads may need more frequent pumping.
3. Have a licensed septic professional determine your ideal interval and record it for future reference.
4. Annual professional inspection
5. Schedule at least one annual check of the tank, baffles, inlet/outlet tees, and, if present, pumps and alarms.
6. Ask the inspector to verify sludge and scum layers, drainage rates, and the condition of any risers and lids.
7. Keep documentation
8. Maintain a file with pumping dates, inspection notes, and any repairs. This helps you plan future service and can be important for resale disclosures.

What to inspect in your septic system

• Tank integrity: look for cracks, leaks, or rusting steel components; ensure lids are secure and access risers are properly sealed.
• Baffles and tees: confirm they're intact to prevent solids from exiting to the drain field.
• Sludge and scum levels: ensure there's adequate space below the outlet tee for proper flow.
• Drain field condition: watch for surface wet spots, lush patches over the field, or unusually foul odors—these can indicate a failing absorption area.
• Pumps and alarms (if applicable): ensure float switches and alarms operate, and batteries or power supplies are reliable.
• Plumbing within the home: fix leaks, oversized loads, and running toilets—these directly impact system health.

Protecting your drain field in Antioch's climate

• Manage irrigation and surface water: avoid watering near the drain field; ensure proper grading to direct runoff away from the area.
• Plant wisely: keep trees and deep-rooted shrubs away from the drain field; plant shallow-rooted grass or ground cover instead.
• Minimize soil disruption: avoid heavy construction or heavy vehicle traffic over the drain field.
• Use cleaners wisely: limit heavy chemical cleaners, solvents, and disinfectants that can disrupt beneficial soil microbes.

Water use and appliance choices

• Spread out wastewater: run full laundry loads and avoid multiple high-demand uses (like dishwasher and long showers) simultaneously.
• Install high-efficiency fixtures: low-flow toilets, showerheads, and front-loading laundry machines reduce daily loading on the septic system.
• Mind FOG: limit fats, oils, and grease; use absorbent materials rather than flushing them down the drain.

Seasonal considerations for Antioch

• Winter wet season: monitor for surface damp spots or odors after heavy rains; compensate with shorter, more frequent pumping if advised by your pro.
• Summer drought: conserve water to reduce hydraulic load during hot months; ensure irrigation does not overwhelm drain fields when soils are dry and compacted.
• Flood risk areas: if your home is on a slope or near drainage paths, consult a local pro about field trench protection and drainage planning.

Local and official resources

• Contra Costa County Onsite Wastewater Treatment System (OWTS) Program:
• California State Water Resources Control Board – Septic Systems:
• Additional guidance and consumer information:

Cost Expectations for Septic Services in Antioch

Septic Tank Pumping

• What it includes: removing sludge and scum, cleaning the tank, inspecting baffles and tank lids, and checking accessibility for future maintenance. In Antioch, many homes have 1,000–1,500 gallon tanks, and clay soils or tight driveways can affect access and frequency.
• Typical cost in Antioch: approximately $250–$700, depending on tank size, accessibility, and the contractor's travel time.
• Steps to plan:
  1. Confirm access (driveway clear, gate unlocked).
  2. Schedule during dry weather for best access.
  3. Receive a post-pump inspection note with any needed follow-up.

Septic System Inspection

• What it includes: visual inspection of the tank, risers, and manways; check of baffles and scum layer; pump status if present; basic field inspection. Full inspections may include a camera check of lines.
• Why it matters in Antioch: lenders and insurers often require formal inspections for real estate transactions; regular inspections help prevent surprise failures in clay soils.
• Typical cost in Antioch: basic inspection about $100–$300; full inspection with camera and report about $350–$600.
• Steps to plan:
  1. Gather any past records or drawings.
  2. Schedule a qualified septic inspector.
  3. Review the written report and note any recommended maintenance.

Drain Field Evaluation and Soil Tests

• What it includes: soil analysis, percolation testing, and evaluation of drain field capacity; site assessment is especially important when a field has failed or when replacement is anticipated.
• Antioch specifics: East Contra Costa soils can be clay-heavy with groundwater fluctuations, which often necessitates larger or alternative field designs (e.g., trench extensions or mound systems).
• Typical cost in Antioch: $1,000–$3,000 for a baseline evaluation; more comprehensive testing or design work can run higher.
• Steps to plan:
  1. Obtain soil probe or percolation test requirements from the county.
  2. Schedule with a septic designer familiar with local soils.
  3. Use results to guide replacement or expansion plans.

Drain Field Repair and Replacement

• What it includes: repair of failed trenches or lateral lines, sealing and backfill, possible trench enlargement, or installation of a redesigned field or mound system; includes permit coordination.
• Antioch specifics: clay soils and seasonal groundwater can drive higher costs for field expansion or mound systems.
• Typical cost in Antioch: repair $2,000–$8,000; full drain field replacement $8,000–$25,000; mound systems or raised fields $15,000–$40,000.
• Steps to plan:
  1. Obtain a professional assessment to determine feasibility.
  2. Review county permit requirements.
  3. Budget for contingencies in case of site redesign.

Septic Tank Replacement

• What it includes: new tank, lids or risers, inspection ports, and connection to existing lines if feasible.
• Typical cost in Antioch: $2,500–$6,000, depending on tank material (concrete, fiberglass, or steel) and accessibility.
• Steps to plan:
  1. Confirm tank size based on household needs.
  2. Schedule replacement with a licensed contractor.
  3. Plan for potential land or driveway adjustments if needed.

New System Installation and System Replacement (Full System)

• What it includes: site design, permitting, tank(s), drain field or mound, backfill, and final tests.
• Typical cost in Antioch: $10,000–$40,000+, influenced by soil, lot shape, and chosen system (standard trench vs. mound), plus permits.
• Steps to plan:
  1. Engage a designer familiar with Contra Costa County requirements.
  2. Obtain soil tests and a county plan review.
  3. Prepare for a multi-week to multi-month project timeline.

Filters, Pumps, and Alarm Service

• What it includes: cleaning or replacing effluent filters, lift pumps, and alarm systems; testing operation and wiring.
• Typical cost in Antioch: effluent filter replacement $350–$800; lift pump $600–$1,500; service call $100–$250.
• Steps to plan:
  1. Schedule routine maintenance to avoid system shocks.
  2. Keep a spare alarm or parts on hand if properties are far from service shops.

Permitting and Regulatory Compliance

• What it includes: plan reviews and permit applications with Contra Costa County Environmental Health; inspections during installation or replacement.
• Typical cost in Antioch: roughly $500–$2,000 for permit and plan review, depending on project scope.
• Steps to plan:
  1. Start early with the county to align design and permit timing.
  2. Budget permit time and fees in project timelines.

Maintenance Plans and Preventive Care

• What it includes: routine inspections and pumping on a schedule to fit household usage; optional service plans with bundled visits.
• Typical cost in Antioch: annual inspection $150–$350; pumping every 3–5 years; maintenance plans may add $10–$30 per month.
• Steps to plan:
  1. Choose a maintenance cadence based on household water use.
  2. Keep calendar reminders for inspections and pumping.

Official resources

• Contra Costa County Environmental Health – Onsite Wastewater Systems:
• California Department of Public Health – Onsite Wastewater (OC/OWS programs):
• U.S. EPA Septic Systems information: https://www.epa.gov/septic