Septic in Amboy, WA

Amboy feels like a tucked-away corner of Clark County, with timbered lots, gravel driveways, and homes that keep their wastewater on site. In this part of Washington, a septic system is a quiet, everyday part of life that makes busy kitchens, loads of laundry, and long showers possible without relying on a public sewer nearby. As your neighbor and a local septic contractor, I've helped many Amboy families plan, install, and maintain systems that fit our hills, soils, and climate.

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

Yes. For most properties here, a septic system is the standard arrangement because municipal sewer lines don't reach the rural parts of Amboy. If you're buying a home in this area, you should absolutely expect a septic system as part of the home's core infrastructure unless you're looking at a rare property that's connected to a city sewer. When you're buying, treat the septic with the same care you give the roof and foundation. A septic inspection is a smart step and can save you surprises down the road. Practical checks to discuss with your inspector or seller include:

• The last pump date and the tank size
• Tank condition and signs of leaks or backups
• Leach field health, including surface dampness, unusually lush vegetation, or odors
• Access points, permits, and records from a licensed contractor

Why homes typically use septic systems in Amboy

• Rural land use and limited reach of centralized sewer services
• Private wells for drinking water, paired with on-site wastewater treatment
• Soils and terrain that, when properly designed and maintained, support on-site treatment
• Lower upfront infrastructure costs than extending a sewer main across long distances
• A maintenance-minded approach that can be tailored to individual lots

High-level explanation (why septic exists here)

A typical septic system in Amboy consists of a tank that collects solids and a drain field that distributes effluent into the soil for natural treatment. The system relies on soil, biology, and time to break down waste. Because Amboy's mix of rural lots and varied soils isn't suited to a one-size-fits-all sewer line, on-site systems remain the practical, long-term solution for many homes. When pumped and inspected regularly, these systems can serve a home reliably for decades.

From here, you'll find practical guidance on maintenance, inspections, and what to expect when buying a home in Amboy.

Where Septic Systems Are Common in Amboy

Rural, unincorporated Amboy areas

In Amboy, a large share of homes sit outside the city's urban core, in rural or semi-rural pockets where centralized sewer lines aren't available. That reality is why on-site septic systems are the norm here rather than the exception. If you live on a countryside lot or in a subdivision that predates sewer expansion, you're much more likely to rely on a septic system for wastewater treatment.

Lot size and layout that support onsite systems

• Typical parcels tend to be larger than urban lots, often ranging from half an acre to several acres. That extra space is essential for placing a septic drain field and keeping it well away from wells, streams, and property lines.
• Open, flat or gently sloped terrain helps with drain-field design. Very steep lots or those with dense drainage issues may require specific engineering to ensure proper absorption and adequate setback distances.
• Proper setbacks matter: septic systems need buffer zones from wells, drinking-water sources, surface water, trees with deep roots, and buildings. In Amboy's spread-out lots, these setbacks are usually feasible, but not always, depending on soil and topography.

Soil and slope considerations in Amboy

• Soil type and drainage strongly influence septic performance. Well-draining soils (such as certain sandy or loamy textures) support effluent infiltration, while heavy clays or perched groundwater can complicate the system's function.
• Sloped sites require careful planning to prevent surface runoff from washing through the drain field and to maintain gravity flow for some designs. In Amboy's foothill and hillside areas, engineers may specify additional trenching or alternative treatment units to meet local rules.
• Proximity to water features and setbacks from streams or seasonal creeks are standard concerns. Keeping the drain field away from wells and flood-prone zones helps protect both the system and water quality.

How to confirm whether a property uses septic

1. Check sewer availability for your exact address. If public sewer is slated or available nearby, it may affect drainage and permitting requirements. Local health or planning departments can confirm service status.
2. Review property records for on-site sewage system permits and as-built drawings. These documents show tank locations, leach-field boundaries, and soil conditions used in the design.
3. If you're buying, request current pump and inspection records and verify the system's age and condition. An on-site evaluation by a licensed septic professional is wise before closing.

Maintenance expectations for Amboy homes with septic

• Regular pumping is essential. Most households pump every 3–5 years, but usage, household size, and system design can shift that interval.
• Protect the drain field: avoid planting trees or shrubs with deep roots over or near the field, limit heavy vehicles on the drain field, and keep all household chemicals, oils, and non-biodegradable items out of the system.
• Schedule periodic inspections, especially after major rainfall or snowmelt, to catch issues early and extend the life of the system.

Working with official resources

• Washington State Department of Health – Onsite Sewage Systems:
• Clark County Public Health – Onsite Sewage System Program:
• Washington State Department of Ecology – Septic systems information:

Practical notes for Amboy homeowners

• If you're planning new construction or a major remodel in Amboy, expect septic feasibility to be a central part of site design and permitting.
• Keep good records: location of tanks, distribution box, and leach fields aid future pumping, inspections, and any repairs.
• Use licensed professionals for design, installation, and maintenance to ensure compliance with state and county standards.

Septic vs Sewer: What Homeowners in Amboy Should Know

Understanding the Basics

• A septic system sits on your property. Wastewater flows from your home into a tank, solids settle, and treated liquid drains to a subsurface field.
• A sewer connection goes to a centralized treatment plant run by a utility. Your home then pays monthly service fees and a tie-in or connection charge, depending on your district.
• Responsibilities differ: with septic, you're responsible for maintenance and pumping. With sewer, maintenance is handled by the utility, though you're still responsible for indoor plumbing upkeep.
• Costs and timing vary. Septic pumping and repairs happen on your schedule; sewer bills are ongoing and can include connection fees if you're tying in or upgrading.
• Longevity and performance hinge on care. A well-maintained septic system can last decades; a sewer connection depends on the reliability of the public system and your usage.

Is Amboy Connected to a Sewer System?

Amboy-area homes often rely on septic, but connections to municipal sewers exist where a district serves the property. Because lines and service areas change over time, verify for your exact address.

• Check your property records or assessor map to see if a sewer district serves your parcel.
• Contact Clark County Public Health to confirm service status and any nearby districts that might extend into your area:
• Clark County Public Health – Septic Systems:

Typical Septic System Types in Amboy

Conventional gravity septic systems

A conventional gravity system is the most common in Amboy. It uses a septic tank to separate solids from liquid, followed by a drainfield where effluent slowly percolates through the soil.

• How it works: solids settle in the tank, liquids exit to perforated pipes in gravel-filled trenches, and the soil treats the water.
• Site needs: adequate soil depth, good drainage, and sufficient setback from wells, property lines, and water sources.
• Pros/Cons: simple, reliable, and cost-effective when soils are favorable; performance drops if the soil is too shallow or saturated.
• Maintenance hint: regular pumping every 3–5 years (or per local guidance) keeps solids from overflowing into the drainfield.

Pressure-dosed / pressure distribution systems

These systems use a small pump to distribute effluent evenly across the drainfield, which helps when soils aren't uniform or where there are shallow rocks or perched groundwater.

• How it works: a pump chamber moves effluent to multiple laterals, reducing overloading in one area.
• When to consider: variable soil condition, shallow soil, or where a conventional drainfield isn't viable.
• Pros/Cons: more even field use and better performance in challenging soils; higher upfront and maintenance costs.
• Maintenance tip: ensure the pump and alarm are regularly serviced and inspected.

Mound systems (raised drainfields)

Mounds are used when native soil can't absorb effluent or when groundwater is too high.

• How it works: a raised bed of sand beneath the drainfield sits above native soil, increasing the distance for treatment.
• Pros/Cons: works in difficult soils; higher installation cost and more ongoing maintenance than a conventional system.
• Site notes: requires specialized design and permitting; plan for adequate access and maintenance space.
• Maintenance: routine inspections, pump-outs as needed, and monitoring of surface features.

Aerobic Treatment Units (ATU) with drainfield or spray irrigation

ATUs pre-treat wastewater with aeration, providing higher quality effluent before it reaches the drainfield.

• How it works: aerobic bacteria reduce solids and BOD, then treated water is distributed to a drainfield or sprayed over a suitable area.
• When used: in properties with limited soil absorption, higher effluent strength, or nitrate concerns.
• Pros/Cons: excellent treatment capability; higher energy use and ongoing service requirements.
• Maintenance: frequent servicing, electrical checks, and annual service visits are common.

Sand filtration and other specialty systems

Sand filtration or combined treatment systems can be used where soils are particularly limiting or regulatory requirements demand extra treatment.

• How it works: effluent passes through a sand filter or additional media to improve polishing before drainage.
• Pros/Cons: improved effluent quality, but higher cost and more complex upkeep.
• Maintenance: periodic inspections, filter/media replacement as recommended by the installer.

Shared or community systems

Some larger properties or neighborhoods rely on a single enhanced treatment or shared drainfield.

• How it works: one system treats effluent for multiple units; design and operation must be regulated.
• Pros/Cons: can be economical at scale, but requires careful management and clear ownership/maintenance agreements.
• Maintenance: regular system-wide inspections and coordinated pumping/treatment schedules.

Quick decision guide (start here if you're unsure)

1. Check soil depth and groundwater with a local septic professional or Clark County health resources.
2. Consider site constraints (rock, slope, lot size).
3. Compare upfront costs and ongoing maintenance for conventional vs. specialty systems.
4. Verify permits and design requirements with official agencies: Washington DOH and Ecology.

Official resources

• Washington State Department of Health: Onsite Sewage Systems.
• Washington State Department of Ecology: Onsite Wastewater Program.

Remember, local regulations and site conditions drive the right choice. Always consult a licensed onsite wastewater professional and refer to your county health department for guidance specific to Amboy, WA.

Common Septic Issues in Amboy

Drainfield saturation and high groundwater

Amboy's wet winters and local geology mean many drainfields contend with a perched water table and saturated soils, which cut the soil's ability to absorb effluent.

• Symptoms to notice:
  • Sluggish drains, toilets that gurgle, or sewage odors in the house
  • Wet or spongy areas over the drainfield, or lush, unusually green grass patches in that area
  • Standing water in the leach field after rainfall
• Why Amboy is prone:
  • High annual rainfall and seasonal flooding can keep soils saturated
  • Native soils may be clay-rich or have limited vertical drainage, reducing absorption
  • Shallow groundwater in flood-prone basins can back up into the drainfield
• What to do (steps):
  1. Schedule a septic inspection to confirm drainfield health and soil absorption capacity.
  2. Consider drainfield upgrades or alternatives (such as a mound or sand-filter system) if absorption is consistently poor.
  3. Reduce wastewater load near the field: fix leaks, install water-saving fixtures, and limit irrigation over the drainfield.
  4. Have proper setback boundaries and maintain access to inspect ports and cleanouts.
• Official guidance:
  • Washington State Ecology on-site sewage systems:

Tree roots and landscaping encroaching on the system

Root intrusion is a common issue when trees and shrubs are planted too close to the drainfield or lateral lines.

• Symptoms to notice:
  • Sudden drop in drainage performance, sinks or wet spots after planting nearby
  • Cracked or separated septic lids or cleanouts near trees
• Why Amboy is unique:
  • Many homes feature mature landscaping with robust root systems
  • Roots travel in search of moisture, potentially invading pipes and tanks
• What to do (steps):
  1. Map the septic system layout and keep mature trees and large shrubs at a safe distance (often 20–30 feet, but consult a pro).
  2. Prune back or relocate root-heavy plantings if they threaten the lines.
  3. Install root barriers if re-siting is not possible.
  4. Have lines inspected for root damage and repair promptly to prevent leaks.
• Official guidance:
  • EPA Septic Systems overview: https://www.epa.gov/septic

Soil constraints and site design challenges

Amboy's soils can be variable, with clay content, compaction, and in some areas shallow bedrock or basalt layers affecting absorption.

• Symptoms to notice:
  • Persistent wet spots, slow drainage, or abrupt changes in soil moisture around the yard
  • Distorted or sunken areas over the drainfield after heavy rain
• Why Amboy-specific:
  • Local geology may limit vertical drainage
  • Past grading or fill can interfere with natural infiltration
• What to do (steps):
  1. Have a professional perform a soil assessment and drainage evaluation prior to any repair or replacement.
  2. If absorption is limited, work with a designer to choose appropriate technologies (mounded systems, pretreatment, or alternative drainfields).
  3. Use proper backfill and compaction practices during installation to preserve drainage paths.
  4. Install inspection ports and monitoring wells to track system performance.
• Official guidance:
  • Washington State Ecology on-site sewage systems: https://ecology.wa.gov/Water-Shorelines/Water-quality/On-site-sewage-systems

Maintenance practices and daily-use challenges

Everyday habits strongly influence system longevity, especially in Amboy's climate and lot designs.

• Common pitfalls:
  • Flushing wipes, fats, oils, and grease; chemical cleaners; and non-biodegradable items
  • Overloading the system with laundry or dishwasher cycles
  • Delayed pumping or infrequent maintenance
• What to do (steps):
  1. Use water-efficient fixtures and spread out water use to avoid peak loads.
  2. Pump the septic tank every 3–5 years (or per a professional's recommendation based on tank size and usage).
  3. Keep a maintenance log includingPump dates, inspections, and notable repairs.
  4. Avoid parking or building over the drainfield, and keep surface activities away from the area.
• Official guidance:
  • EPA on maintenance and troubleshooting: https://www.epa.gov/septic
• Additional regional resource:
  • Washington State Ecology on-site sewage systems for local best practices: https://ecology.wa.gov/Water-Shorelines/Water-quality/On-site-sewage-systems

Septic Inspection, Permits & Local Oversight

Local oversight and regulatory bodies

• In Amboy, WA, on-site sewage systems are overseen by Clark County Public Health Environmental Health and the Washington State Department of Ecology (OSS program). Local permitting, inspections, and maintenance requirements flow through county channels, with state rules providing the overarching framework.
• Official resources:
  • Clark County Public Health – On-site Sewage Systems:
  • Washington State Dept. of Ecology – On-site Sewage Systems:
  • WA Administrative Code for OSS (technical standards): https://apps.leg.wa.gov/WAC/default.aspx?cite=246-272A

Permits you may need

• New system installation: permit required before work begins.
• System replacement or upgrade: permit required for design changes or capacity adjustments.
• Repairs affecting tanks, drain field, or setbacks: permit may be required.
• Modifications that change drainage patterns or performance: permit required to ensure compliance.
• Real estate transactions: some properties require an OSS disclosure or permit clearance; check with the county.

The inspection process (step-by-step)

1. Identify the authority: determine whether Clark County Environmental Health or the state OSS program handles the project.
2. Gather and submit required documents: site plans, system design, and any existing as-built drawings.
3. Pay applicable fees and schedule inspections.
4. Undergo inspections at key stages:
   • Plan review and permit issuance
   • Installation or repair progress inspection
   • Final inspection with as-built submission
5. Receive final approval and file the completed permit with the county for long-term records.

What to have ready before scheduling

• Parcel number, street address, and lot layout
• Any prior OSS plans or as-builts
• A rough construction or replacement timeline
• Contacts for licensed septic designer and installer
• Clear access routes for inspectors to tanks, trenches, and components

During and after inspections

• Common findings to address: missing access risers or lids, unapproved design changes, improper pumping access, insufficient separation distances, or unauthorized material use.
• Document retention: keep all permit paperwork, inspection reports, and final approvals for future reference.
• Timelines and fees: inspection timelines and fees vary by project; plan for potential re-inspections if issues are found.

Ongoing local oversight and maintenance

• OSS maintenance requirements vary by jurisdiction but often involve annual or periodic notifications and adherence to the system's maintenance plan.
• Regular pumping is essential; typical guidance from professionals ranges from every 3-5 years, depending on tank size, household water use, and the system design.
• Proactive care: protect the drain field from heavy equipment, avoid landscaping over drain lines, and prevent root intrusion to extend system life.

Helpful resources

• Clark County Public Health – On-site Sewage Systems: https://www.clark.wa.gov/public-health/onsite-sewage
• Washington State Dept. of Ecology – On-site Sewage Systems: https://ecology.wa.gov/Regulations-Publications/Regulatory-programs/On-site-sewage-systems
• WA Administrative Code for OSS: https://apps.leg.wa.gov/WAC/default.aspx?cite=246-272A

Septic Maintenance for Homes in Amboy

Amboy-specific factors that affect your system

Amboy's mix of wet winters, variable soils, and rural lot layouts influences how your septic system behaves. Soils in this area can saturate after heavy rains, and seasonal freezing can slow bacterial activity in the tank. Drainfields may sit near groundwater or perched water tables, so routine care matters more here to prevent backups. Local vegetation, tree roots, and winter windbreaks can also impact drainfield performance. Understanding these conditions helps you tailor a maintenance plan that fits Amboy's climate and landscape.

Regular inspections and pumping

• Schedule pumped maintenance every 3–5 years for a typical family, or sooner if your tank is small or water use is high. The interval depends on tank size, household water habits, and soil absorption.
• Hire a Washington-DOE-licensed septic contractor for inspections, pumping, and tank inspections. Ask for a written report on tank condition, baffles, and any filters or effluent screens.
• During service, have the contractor check for standing water around the tank, joint leaks, and signs of drainfield distress. Request documentation of all work for your records.
• Keep a simple maintenance log with pump dates, observed issues, and repairs. This helps you plan ahead for Amboy's seasonal changes.

Protect the drainfield and surrounding area

• Never drive or park vehicles on the drainfield area; heavy loads compress soil and can damage the absorption field.
• Plant only shallow-rooted vegetation over the drainfield; avoid trees and shrubs with aggressive roots nearby.
• Direct roof and surface runoff away from the drainfield to prevent soil saturation.
• Use strainers in sinks and dispose of fats, oils, and grease in the trash rather than the disposal or sink.
• Install a filter or screen at the tank inlet if your system has one and follow the contractor's maintenance schedule for cleaning.

Water use, fixtures, and appliances

• Install water-efficient fixtures (low-flow toilets, showerheads, and taps) and fix leaks promptly to reduce daily load on the system.
• Run full loads in dishwashers and laundry; avoid nonstop cycling that keeps wastewater flowing through the tank.
• Be mindful of garbage disposals—they increase solids in the tank. Consider composting organic waste or limiting disposal use to reduce solids buildup.

Amboy-specific challenges and practical tips

• Winter and flood risk: heavy rains can saturate soils quickly. Plan pumping around wet seasons and avoid scheduling immediately before or after major storms.
• Sump pumps and yard drainage: discharge from sump pumps or yard drains should usually be kept out of the septic system unless your local code permits it. Check Amboy-area guidance and your contractor's recommendations.
• Well proximity and groundwater: ensure proper setback distances between the septic system and any wells or surface water features per local health guidance. Contact your county health department for zone-specific requirements.
• Record-keeping after work: maintain copies of permits, inspection reports, pump records, and system layouts to reference during inspections or when you plan any landscaping changes.

When to call in a professional

• You notice sewage backing up into drains, gurgling sounds in pipes, or standing effluent in the area of the drainfield.
• The contractor flags issues with tank baffles, cracks, or effluent filters that require replacement or remediation.
• You're planning major landscaping or tree planting near the septic area and want a professional assessment.

Official resources for Amboy homeowners

• Washington State Department of Health – Onsite Wastewater Treatment Systems:
• Washington State Department of Ecology – Onsite Sewage Treatment Systems:
• Clark County Public Health – Onsite Sewage Disposal Systems (if applicable in your area):
• EPA septic system information: https://www.epa.gov/septic

(Note: If Amboy sits in a different county, check your local county health department's OSDS page for jurisdiction-specific requirements and forms.)

Cost Expectations for Septic Services in Amboy

Septic Tank Pumping

• What it includes: large vacuum pump-out to remove liquids and solids from the septic tank, cleaning of access ports, basic inspection of tank condition and baffles, and a brief assessment of the drainfield's appearance.
• Amboy specifics: many properties sit on hillside clay soils with variable access. Pumping may require coordinating with driveways, tight gates, or narrow access routes; some jobs need smaller equipment or portable tanks for awkward locations.
• Typical cost in Amboy: $300–$600 for a standard 1,000-gallon tank; $150–$300 for smaller tanks; $600–$1,000+ if two tanks or unusually difficult access.
• What affects price: tank size, number of chambers, ease of access, presence of risers, travel distance, and whether an on-site inspection is included.
• Steps you'll see in service: 1) confirm access, 2) pump solids, 3) inspect baffles, 4) note recommendations, 5) receive a post-service log.
• Official resources: Washington DOH on septic tank maintenance and safety (doh.wa.gov); Washington Ecology OSS guidance (ecology.wa.gov).

Septic Tank Inspection

• What it includes: visual inspection of tank lids and access ports, baffle condition, sludge/scum layer estimation if possible, and a basic evaluation of whether the tank schedules pumping soon.
• Amboy specifics: inspections may be combined with a pumping visit; in older Amboy homes, tank depth, cover accessibility, and adjacent utilities can influence the time required.
• Typical cost in Amboy: $150–$350 for a basic inspection; $350–$550 for enhanced inspection with camera review or detailed reporting.
• What affects price: whether a full camera inspection is added, existing permits or records, and whether a written report is included.
• Steps you'll see in service: 1) schedule and access verification, 2) lid/port inspection, 3) baffle check, 4) recommendations if pumping is due, 5) deliver report.
• Official resources: WA DOH septic systems pages; Clark County Public Health septic information (clark.wa.gov/public-health/sewage).

Drainfield Evaluation / Perc Test (for existing systems or new installations)

• What it includes: assessment of drainfield performance, soil texture and percolation considerations, plus groundwater concerns; may include a drainfield dye test or advanced soil testing if access is limited.
• Amboy specifics: Amboy soils can be variable with clay layers and seasonal saturation; evaluations frequently guide whether a drainfield upgrade (e.g., mound or effluent filter) is needed.
• Typical cost in Amboy: $400–$900 for a basic evaluation; $1,000–$1,800 for a more thorough percolation/soil test and reporting.
• What affects price: site size, depth to water table, required soil boring, and whether a full engineering report is needed for permits.
• Steps you'll see in service: 1) site walk, 2) soil observation, 3) test results, 4) recommended system or upgrade plan, 5) permit-ready documentation.
• Official resources: Ecology OSS guidance; local health department guidance (Clark County if applicable).

New System Design, Permitting, and Installation (Residential)

• What it includes: site evaluation, system design tailored to soil and slope, permit applications, installation by licensed septic professionals, and final system inspection.
• Amboy specifics: hillside properties and clay soils common to Amboy often require trenches shaped to slope, deeper fills, or alternative drainfield technologies; local permit timing may hinge on seasonal weather.
• Typical cost in Amboy: design/permits roughly $2,000–$6,000; full installation generally $15,000–$40,000+ depending on tank size, drainfield type, and access constraints.
• What affects price: tank size, drainfield type (standard bed vs. mound), distance to well and property boundaries, and any required soil amendments.
• Steps you'll see in service: 1) preliminary site assessment, 2) system design submission, 3) permit approval, 4) installation, 5) final inspection and certification.
• Official resources: DOH and Ecology OSS program pages; Clark County Health Department septic permitting info.

System Repair and Replacement

• What it includes: cracked tank, failed baffles, leach-field saturation, pump chamber issues, or collapsing drainfields; may require partial or full drainfield replacement and/or tank repair.
• Amboy specifics: repairs in Amboy often hinge on driveway access, soil conditions, and groundwater timing; replacement may involve longer trenches or mound adaptations.
• Typical cost in Amboy: $2,000–$10,000 for minor repairs; $10,000–$40,000+ for drainfield replacement or complete system overhaul.
• What affects price: extent of failure, need for trenching or excavation, replacement tank size, and permit requirements.
• Steps you'll see in service: 1) diagnostic testing, 2) repair plan, 3) permits if needed, 4) repair or replacement, 5) post-work evaluation.
• Official resources: Ecology OSS guidelines; WA DOH septic system repair resources.

Drainage System Decommissioning / Abandonment (when closing or reworking a site)

• What it includes: safe decommissioning of an old septic tank and lines, filling with appropriate material, and proper documentation.
• Amboy specifics: Abandonment must meet local code to prevent future contamination and may require waterway setback considerations.
• Typical cost in Amboy: $1,000–$3,000 depending on tank size and access.
• Steps you'll see in service: 1) confirm tank status, 2) isolate and vent, 3) remove or fill, 4) document abandonment, 5) provide waste disposition notes.
• Official resources: DOH and Ecology guidance on proper abandonment.

Maintenance Planning / Long-Term Service Programs

• What it includes: annual or multi-year maintenance plan, reminders, and discounted or bundled service pricing.
• Amboy specifics: a local maintenance plan can help homeowners manage seasonal access windows and budget for pumping or inspections around wet seasons.
• Typical cost in Amboy: $100–$300/year for ongoing plans; some providers include a first pumping or inspection in the plan.
• Steps you'll see in service: 1) personalize maintenance schedule, 2) set reminders, 3) annual service visits, 4) adjust plan as needed.
• Official resources: DOH and Ecology maintenance guidance; local health department recommendations.

Official resources to consult:

• Washington Department of Health: Sewage and Septic Systems
• Washington Department of Ecology: Onsite Sewage Systems
• Clark County Public Health: Sewage and Septic Information (search Clark County public health septic)