Septic in Palm Springs, CA

Last updated: Mar 21, 2026

Palm Springs greets you with bright skies, shaded patios, and a practical reminder that even small, well-kept homes need smart wastewater planning in the desert. Is septic common in Palm Springs? Should I expect septic if I own or buy a home? In many neighborhoods, yes. Septic systems are still a routine reality here, especially where city sewer service isn't available to every block or in hillside and older subdivisions. If you're buying, ask about sewer service status, and review any septic permit history, pump records, and recent inspections. For current homeowners, a quick check on the tank age and soil conditions now can save headaches later.

Why homes typically use septic systems in Palm Springs

  • Public sewer reach varies: Not every street or community is connected to a central sewer line, so on-site systems remain common in many areas.
  • Desal and drought considerations: Desert water-use rules and conservation-minded practices influence how wastewater is generated and managed, making a properly designed septic system a practical fit for some homes.
  • Soil and site realities: Desert soils, rock, and slope require careful siting and sizing to ensure the system drains properly and protects groundwater.
  • Cost and development patterns: Extending sewer lines across rugged terrain or across established neighborhoods can be expensive and slow, so on-site treatment often makes sense for homeowners and builders.
  • Environmental stewardship: When installed and maintained correctly, septic systems help protect scarce groundwater resources and the unique desert ecosystem.

High-level explanation (why septic exists here)

A septic system is an on-site wastewater treatment solution. Wastewater flows into a tank where solids settle to the bottom, fats and oils rise to the top, and bacteria begin breaking down organic matter. The clearer liquid then drains through a drain field into the surrounding soil. In Palm Springs' arid climate, the system must be properly sized for the home and the soil must percolate effectively while staying clear of wells, gardens, and outdoor living spaces. That balance—proper siting, appropriate tank size, and a well-maintained drain field—is what keeps a septic system reliable in our desert climate.

Think of me as your friendly neighbor who's also a pro—here to help you read reports, plan inspections, and keep your system running smoothly. We'll touch on practical maintenance and quick checks as you explore the next sections.

Where Septic Systems Are Common in Palm Springs

Map of septic coverage in Palm Springs, CA

Geographical patterns: where septic is still used

  • The core of Palm Springs and newer developments near the city center are largely connected to public sewer lines. If you live inside the main sewer service boundaries, your home is very likely on a municipal system rather than a septic tank.
  • Septic systems remain common on the city's outskirts, hillside neighborhoods, and rural parcels where extending sewer lines is costly or technically challenging. These areas often have parcels that were developed before sewer expansion or in locations where geographic features (steep slopes, rock, or limited space for a leach field) make sewer expansion impractical.
  • In the Coachella Valley's desert environment, soil conditions and slope influence septic design. Many hillside or canyon-adjacent properties rely on well-designed onsite systems, including conventional tanks with leach fields or mound systems to accommodate limited grade or shallow groundwater.
  • Even in towns nearby Palm Springs, unsewered pockets persist where property owners self-manage wastewater. Local permitting, maintenance requirements, and pumping schedules are guided by state and county rules, as well as city ordinances where applicable.

Why septic persists in Palm Springs

  • Cost and practicality of extending sewer lines: Bringing sewer mains to remote foothill or outlying parcels can be prohibitively expensive for limited sections of land.
  • Parcel size and layout: Larger lots or irregular parcels in the foothills often aren't cost-effective to connect to a distant sewer main, making onsite systems a sensible option.
  • Topography and soil: Steep slopes, rocky soils, and limited feasible space for drain fields can favor onsite wastewater solutions over trench-based sewer connections in certain areas.
  • Transitional zones: Areas near the edge of sewer service boundaries may be in transition—some homes are already sewer-connected, others remain on septic until future infrastructure work makes connection feasible.

Typical areas and parcel types where septic is common

  • Foothill and hillside properties above the city core, where grade and drainage challenge conventional trench drain fields.
  • Rural parcels and neighborhoods on the outskirts of Palm Springs that sit outside established sewer districts.
  • Older homes that were built before sewer lines reached their streets or before municipal upgrades were completed, especially where future sewer expansion plans exist but aren't yet in place.
  • Lots with limited footprint for a traditional drain field, where engineered onsite systems (such as mound plants or alternative designs) are used under local permitting guidelines.

How to determine if your property uses septic (and what to do next)

  1. Confirm sewer status
  2. Check your property records or contact the City of Palm Springs Public Works (Sewer Service) to verify whether your home is on municipal sewer or on septic.
  3. If you're outside the city's sewer boundaries, plan for onsite wastewater management and regular maintenance.
  4. Get a professional evaluation
  5. Hire a licensed septic system inspector or designer to assess tank condition, drain field integrity, and system adequacy for your lot, especially if you're considering adding fixtures or a home expansion.
  6. Maintain if you're on septic
  7. Schedule regular pumping (typically every 3–5 years for standard residential systems, but follow local professional recommendations).
  8. Practice water conservation and careful waste disposal to protect the drain field (avoid flushing non-biodegradable items, fats, oils, and excessive chemicals).
  9. Consider sewer connection if available
  10. If sewer is planned for your area, contact local authorities to learn about connection options, timing, and any incentive programs or cost-sharing opportunities.
  11. Plan for change if you want to convert
  12. If you're exploring a conversion from septic to sewer, reach out to the City of Palm Springs and/or Riverside County environmental health resources to understand permit requirements, inspection steps, and potential funding or assistance programs.

Official resources:

  • State Water Resources Control Board – Septic Systems:
  • City of Palm Springs (public information and sewer service):
  • California Department of Public Health (general onsite wastewater information):

Septic vs Sewer: What Homeowners in Palm Springs Should Know

Benefits and Drawbacks at a Glance

  • Sewer pros: no septic tank pumping, no drain field maintenance, predictable monthly bills, aligns with municipal water reuse programs, and reduces groundwater risk from failures.
  • Sewer cons: connection and impact fees can be substantial up-front; potential for sewer outages or disruptions impacting your home; ongoing utility charges regardless of usage.
  • Septic pros: lower or no monthly sewer charges if you're already owned-by-a-septic system; independence from street work or outages; potential cost savings over the life of the system with proper care.
  • Septic cons: regular pumping and inspection required; failure can cause costly repairs and environmental risk; local regulations may restrict or discourage new septic use where sewer is available.

Is Sewer Available in Your Palm Springs Neighborhood?

  • Palm Springs sits in a desert climate where soil, slope, and proximity to groundwater influence wastewater choices. If a municipal sewer line runs in your street, your property may be required or strongly encouraged to connect.
  • Check with the City of Palm Springs (Public Works/Wastewater) to confirm sewer availability and any mandatory connection timelines. You can also ask about any connection fees, assessment districts, or upgrades that might affect cost.
  • If sewer is not available, or if you own a very old septic system in good standing, you may continue on a properly designed OWTS with regular maintenance.

Deciding: Septic vs Sewer in the Desert

  • Consider your lot, soil, and long-term plans:
    • Do you plan to stay in the home for many years? A sewer connection can boost resale value and reduce long-term maintenance risk.
    • Is your soil well-drained and suitable for a drain field, with adequate setback to wells and the property line?
    • Are you in a zone with drought or water-use restrictions that affect disposal field irrigation or discharge practices?
  • Practical steps:
    1. Confirm sewer availability and required timelines with local authorities.
    2. Get a rough cost estimate for connection vs. septic maintenance over 10–20 years.
    3. Review any local environmental rules on reclaimed water use and discharge.
    4. If staying on septic, schedule regular inspections and pumping to prevent failures.

What to Expect If You Connect to Sewer

  1. You'll receive an official notice with a schedule and any connection requirements.
  2. A licensed contractor will perform the connection, which may include trenching, curb stop access, and new sewer lateral installation.
  3. The city or utility may assess a connection fee and ongoing sewer charges based on usage.
  4. You may need to obtain permits from the local building or public works department.
  5. After connection, your septic system (if still present on other parts of the property) becomes less critical for household wastewater disposal.

Maintenance and Long-Term Costs

  • If you stay on septic:
    • Regular pumping every 3–5 years (varies with household size and usage).
    • Avoid flushing non-degradable items, excessive grease, and harsh chemicals that disrupt beneficial bacteria.
    • Schedule professional inspections to detect leaks, broken lids, or drainage issues early.
  • If you switch to sewer:
    • Plan for monthly service charges and possible usage-based fees.
    • Routine sewer line maintenance is handled by the utility—still be mindful of items that can clog the public line (foreign objects, grease).
  • Desert-specific tips:
    • Use landscape irrigation efficiently to minimize drainage through the septic field if you're still on a septic system.
    • Ensure proper grading and drainage to keep runoff away from drain fields.

Official Resources

Typical Septic System Types in Palm Springs

Conventional septic system

  • How it works: A buried septic tank holds wastewater from the home. Solids settle; grease and scum float. Liquid effluent infiltrates a drainfield through perforated pipes buried in trenches within a soil absorption area. Microbes treat some contaminants as the effluent percolates through the soil.
  • When you'll see it: This is the standard choice where soils are suitable and the property is not connected to sewer.
  • Pros and cons:
    • Pros: Simple design, lower upfront cost, easy to maintain routine.
    • Cons: Requires adequate soil depth and drainfield space; performance depends on soil permeability and grading; unsuited soils or high water tables may need upgrades.
  • Learn more: EPA's overview of conventional and alternative septic systems [EPA Septic Systems](and [EPA Septic Systems](

Sand filtration and chambered drainfields

  • How they differ: Instead of a traditional gravel-filled trench, these options maximize infiltrative surface area. Chambered drainfields use modular plastic channels to spread effluent, while sand filtration provides a controlled polishing stage before the effluent reaches the soil.
  • Suitability: Often paired with ATUs or conventional systems in soils with limited permeability or to increase efficiency in arid climates.
  • Pros and cons:
    • Pros: Efficient use of limited space; sometimes easier to maintain in compact lots.
    • Cons: May require specialized installation and long-term maintenance planning.
  • Learn more: EPA septic system resources and state guidelines [EPA Septic Systems](https://www.epa.gov/septic) and [CDPH OWTS](https://www.cdph.ca.gov/Programs/CEH/DRSEM/Pages/OnsiteWastewaterSystems.aspx).

Drip irrigation and spray/landscape disposal (where permitted)

  • Concept: Treated effluent is applied to landscaping via drip emitters or spray irrigation, reducing surface exposure and increasing evapotranspiration in desert environments.
  • Regulatory note: These disposal methods are highly regulated and require local permits, design approvals, and monitoring.
  • Pros and cons:
    • Pros: Attractive landscape irrigation option; can reduce pumpage and groundwater impact when properly designed.
    • Cons: Complex permitting, monitoring, and maintenance; not allowed everywhere.
  • Learn more: Regulatory guidance on recycled water and spray irrigation from state and federal sources [EPA Septic Systems](https://www.epa.gov/septic) and [SWRCB OWTS](https://www.waterboards.ca.gov/water_issues/programs/owts/).

Palm Springs climate and soils influence which OWTS type works best. In desert settings, regulators often emphasize drainage, evapotranspiration potential, and soil depth. Always consult a licensed onsite wastewater professional and your local health department to confirm permitted options for your property.

Common Septic Issues in Palm Springs

Desert soils and drainage limitations

Desert soils in and around Palm Springs can be sandy, rocky, or underlain by caliche or shallow bedrock. These conditions affect how quickly or slowly effluent from a drain field is absorbed. In some spots, soil layers or perched water can limit absorption, while in others, rapid infiltration can carry effluent deeper than planned. The combination of harsh sunlight, a dry climate, and occasional heavy rain can also stress a drain field that isn't properly sized or sited.

  • Signs to watch for:
    • Wet spots, lingering dampness, or a distinct sewage odor above or near the drain field
    • Gurgling toilets or slow-draining fixtures
    • Patchy lush growth over the drain field in an otherwise dry yard
  • What to do:
    1. Have a licensed septic pro evaluate perchment, soil absorption rate, and trench layout.
    2. Confirm proper setbacks from driveways, impermeable surfaces, and trees.
    3. If soils are unsuitable, consider alternatives like a properly engineered mound system or a larger dispersion bed.
    4. Keep up with routine pumping and avoid overloading the system with water.
  • Helpful resource: EPA on-site wastewater and septic system basics

Aging systems and local code updates

Older systems (common in homes built mid-20th century through the 1980s) may lack current access ports, properly sized tanks, or compliant drain-fields. Age increases the risk of leaks, backups, or failure to meet current health standards.

  • Signs:
    • Unpleasant odors, damp patches, or frequent backups
    • Inconsistent drain field performance or cracking in nearby pavement
  • What to do:
    1. Have the system inspected by a licensed septic professional.
    2. Plan for upgrades or retrofits to meet current codes and protect groundwater.
    3. Establish a routine maintenance schedule, including regular pumping and tank inspection.
  • Helpful resource: EPA septic systems overview https://www.epa.gov/septic

Septic Inspection, Permits & Local Oversight

Permits required for septic work in Palm Springs

  • New septic system installation or a major repair/replacement requires an OWTS (onsite wastewater treatment system) permit and plan review. This is typically handled by Riverside County Environmental Health, in coordination with Palm Springs' Building & Safety department.
  • Plans must include a site plan showing setbacks from wells, buildings, driveways, and property lines, plus a soils/perc test and a system design that meets local and state standards.
  • Permits are separate from, but often coordinated with, general building permits. Your contractor should confirm which agency is reviewing the project and secure all necessary approvals before work begins.
  • Repairs or changes to the drain field, tank, or distribution methods usually require a permit as well, even if the work is inside the existing footprint.
  • Work must be performed by a licensed wastewater contractor. County and city inspectors verify that materials, installation methods, and setbacks meet code requirements.

Inspection steps, timing, and what to expect

  1. Pre-approval and plan submission
  2. Gather: site plan, soils report, system design, and permit application. The review process confirms the proposed OWTS meets California and local requirements.
  3. Scheduling and milestones
  4. Expect inspections at key milestones (after trenching and piping is laid, after tank installation, and when backfill and final grading are completed). Your contractor will coordinate with the inspecting agency.
  5. Installation inspections
  6. Tank placement, baffle orientation, risers, lids, and proper separation from wells and structures are checked. Any deviations from the approved plan must be corrected on site.
  7. Drainfield and backfill inspection
  8. The drain field or absorption area must be installed as designed, with correct soil compaction and protection. Backfill around the system is inspected to prevent damage.
  9. As-built drawings and final inspection
  10. After installation, an as-built diagram is often required to document the exact location, orientation, and components of the OWTS. A final inspection verifies that the finished system matches the approved plan and is ready for use.
  11. Permit closure
  12. Once the final inspection is approved, the permit is closed and you'll receive documentation that the system complies with current code.

Local oversight: who enforces and when

  • Riverside County Environmental Health oversees OWTS design reviews, soil evaluations, installation compliance, and inspections for most areas outside strict city-administered projects.
  • Palm Springs Building & Safety department administers building permits and coordinates inspection logistics when a septic project intersects with structural or site-work permits within city limits.
  • State guidance comes from California's health and safety codes for OWTS; local amendments and setbacks may apply, so double-check with the county and city offices.
  • Transfers and disclosures: California real estate transactions often require septic disclosures and, in many cases, a professional septic inspection as part of the escrow process. Confirm with your real estate agent and local health department what is needed for your property.
  • Always verify current requirements with the official offices before starting work, as rules can change with new codes or local amendments.

Resources and where to check

  • California Department of Public Health – Onsite Wastewater Systems: official state guidance and standards for OWTS. [Official site: cdph.ca.gov]
  • City of Palm Springs – Building & Safety: permits, inspections, and project tracking for city projects. [
  • Riverside County Environmental Health – Onsite Wastewater Systems (OWTS) program: county oversight, plan review, and inspection details. [Official county health site: countyofriverside.us or search for "Riverside County OWTS"]

Septic Maintenance for Homes in Palm Springs

Palm Springs climate and soil considerations

Desert conditions affect how your septic system behaves. Palm Springs homes often sit on sandy, gravelly, or caliche-rich soils with high summer temperatures and limited rainfall. These factors influence percolation, drainage, and the rate at which the drain field dries out. Have a qualified septic professional assess soil suitability and determine install or replacement needs, especially if you're on disturbed or hillside terrain. In areas with shallow bedrock or deep root systems nearby, plan for appropriate setback distances and robust drain-field design.

  • Conduct a local soil evaluation before major changes to your system.
  • Expect that drainage may be uneven in sandy versus compact soils; design accordingly.
  • If you're unsure about soil conditions, contact a licensed septic installer familiar with Riverside County guidelines.

Regular pumping and professional inspections

A well-maintained system relies on routine pumping and annual or biannual inspections by a licensed pro. Desert temperatures can affect odor and pressure but don't change the basic maintenance cadence.

  • Pump every 3–5 years for typical family use and a 1,000–1,500 gallon tank, adjusting for tank size and household water use.
  • Increase frequency if you have a garbage disposal, a large family, or frequent high-water events (guests, pool use, etc.).
  • Schedule a professional inspection at least once a year to check baffles, inlet/outlet tees, and the integrity of the tank.

Drain field protection in desert conditions

Your drain field is the living heart of the system. In Palm Springs, keeping the drain field from becoming oversaturated or compacted is key, especially with landscape and irrigation practices.

  • Keep heavy equipment, parking, and landscape activity off the drain-field area.
  • Maintain at least a clear buffer around the field; plant shallow-rooted grasses rather than trees or shrubs with aggressive roots nearby.
  • Direct exterior drainage away from the leach field; avoid roof or patio runoff infiltrating the drain field.
  • Use water-conserving landscaping and irrigation practices to prevent groundwater saturation around the field.

Water use, household waste, and chemical disposal

Conserving water and avoiding harmful inputs extend the life of your septic system in a desert climate.

  • Install high-efficiency toilets, faucets, and appliances; spread water use throughout the day.
  • Run disposal systems (garbage disposals) sparingly; they increase solids entering the tank.
  • Avoid flushing anything non-biodegradable, solvents, paints, pesticides, solvents, or medications.
  • Be mindful of dishwasher and laundry schedules to prevent short-term overload of the tank.
  • Use septic-safe cleaners and products; avoid enzyme or chemical additives unless advised by your installer.

Maintenance checklist for Palm Springs homes

  1. Create and maintain a detailed service log (dates of pumping, inspections, repairs).
  2. Visually inspect the area for wet spots, unusually lush vegetation, or foul odors near the drain field.
  3. Schedule annual professional inspections and plan pumping intervals based on usage and tank size.
  4. Check the accessibility of the tank lid and venting; ensure vent pipes remain clear.
  5. Keep records of all work and any county-permitted changes or upgrades.

Signs of trouble and when to call a pro

Seek immediate help if you notice any of the following, especially during the hot season when issues may intensify:

  • Slow drains, gurgling noises, or sewage odors inside or outside the home.
  • Standing water or soggy ground above or near the drain field.
  • Patches of unusually green, lush growth or patchy grass directly over the system.
  • Backups into sinks or toilets after limited usage, or crushed or collapsed tank components.

When in doubt, contact a licensed septic professional for an on-site evaluation. They can determine whether pumping, repair, or a system upgrade is needed to meet Palm Springs' soil and climate conditions.

Resources:

  • EPA: Septic Systems—Healthy Homes and Communities

Cost Expectations for Septic Services in Palm Springs

Septic Tank Pumping

  • What it includes: removal of liquids and solids from the septic tank to prevent solids from entering the drain field; for Palm Springs, access can be impacted by landscaping, rocks, and desert terrain. Most homes need pumping every 1–3 years depending on tank size, number of occupants, and use.
  • Palm Springs specifics: higher mineral content in the water, irrigation usage, and well-tatered rock soil can affect sludge buildup and pumping frequency. If the tank hasn't been pumped in several years, expect a more thorough pumping and potential baffle inspection.
  • Typical cost in Palm Springs: roughly $350–$700 for standard 1,000–1,500 gallon tanks; larger tanks or difficult access can push toward $800–$1,000+.
  • What to prepare: clear access, remove obstacles, and note any recent odors or slow drains.
  • Official resource: California Department of Public Health – Onsite Wastewater Systems (OWTS) guidance and best practices.

Septic System Inspection (Annual and Real Estate)

  • What it includes: visual field test, inspection of tank and baffles, pump chamber (if present), chamber lids, and overall system condition; may include dye tests or camera inspection if requested.
  • Palm Springs specifics: desert soils, landscape irrigation connections, and compacted soil can mask issues; real estate transactions often require a formal septic inspection.
  • Typical cost in Palm Springs: $200–$450 for a standard inspection; real estate transfer or more thorough inspections can range $350–$800.
  • What to prepare: provide any prior maintenance records and drain-field location if known.
  • Official resource: Riverside County Environmental Health or CDPH OA guidance (statewide). (Environmental Health page) and https://www.cdph.ca.gov/

Drain Field Evaluation and Soil Assessment

  • What it includes: soil analysis, percolation tests, and evaluation of drain-field performance; identifies whether the field can handle current/anticipated wastewater loads.
  • Palm Springs specifics: rocky or compact desert soils, shallow groundwater risk, and limited space can complicate field design and sizing.
  • Typical cost in Palm Springs: $1,000–$3,000 depending on scope and access; full professional evaluation can exceed $3,000 with extensive testing.
  • What to prepare: site plan or map of existing drain field if available; rooftop or irrigation water use data can help sizing.
  • Official resource: CDPH OWTS manuals and design guidance. https://www.cdph.ca.gov/

Drain Field Repair and Replacement

  • What it includes: fixing leaks, broken lines, root intrusion, or channeling problems; replacement may be necessary if soils are unsuitable or the field is failing.
  • Palm Springs specifics: high-heat, dry conditions influence soil moisture and biological activity; proximity to hardscapes or compacted fill may increase repair costs.
  • Typical cost in Palm Springs: repair $2,000–$7,000; full drain-field replacement often $7,000–$25,000 or more, depending on size and trenching needs.
  • What to prepare: access to the drain field, records of prior repairs, and an evaluation of irrigation water usage.
  • Official resource: CDPH OWTS guidelines and Riverside County Environmental Health references. https://www.cdph.ca.gov/

Septic Tank Repair and Baffle Replacement

  • What it includes: resealing cracks, replacing damaged baffles, or fixing inlet/outlet piping; smaller repairs are common but may reveal deeper tank issues.
  • Palm Springs specifics: corrosion from mineral-rich water and drought-related sediment can accelerate wear; access can be obstructed by landscaping.
  • Typical cost in Palm Springs: $500–$2,000 for minor repairs; more extensive tank work may reach $3,000–$6,000.
  • What to prepare: tank location and size, prior repair history, and whether foam or concrete tanks are involved.
  • Official resource: CDPH and local health departments. https://www.cdph.ca.gov/

Septic Tank Risers, Lids, and Access Improvements

  • What it includes: installing or upgrading risers and secure lids for easier future pumping and inspection; reduces maintenance cost and avoids accidental digging.
  • Palm Springs specifics: rock-strewn or hard-packed soils can necessitate careful excavation; codified access improves safety and reduces damage during maintenance.
  • Typical cost in Palm Springs: $1,000–$2,500 depending on materials and depth.
  • What to prepare: property layout and access points; confirm any HOA or city permit requirements.
  • Official resource: California Plumbing Code references via CDPH guidance. https://www.cdph.ca.gov/

New System Design and Installation (Residential)

  • What it includes: site evaluation, system design, permit coordination, trenching, installation of tank, field, and in many cases, alarms and controls.
  • Palm Springs specifics: desert climate, seaward spacing constraints, and permitting for high-desert projects; reuse options and drought considerations may influence design.
  • Typical cost in Palm Springs: $10,000–$40,000+ depending on lot size, field type (gravity vs. pressure), and local permit fees.
  • What to prepare: soil tests, property setbacks, and desired features (alarm, monitoring, tank size).
  • Official resource: CDPH OWTS design and permitting guidelines. https://www.cdph.ca.gov/

Real Estate Transfer Septic Inspections

  • What it includes: a focused assessment tailored for home sale, often with expedited reporting; may require dye tests.
  • Palm Springs specifics: quick turnarounds are common due to escrow timelines; some lenders require a formalized inspection.
  • Typical cost in Palm Springs: $350–$800.
  • What to prepare: recent maintenance records, previous inspection reports, and seller disclosures.
  • Official resource: CDPH and local county requirements. https://www.cdph.ca.gov/

Maintenance Plans and Service Contracts

  • What it includes: scheduled pumping, inspection, and priority service; some plans include emergency call-outs and discounted parts.
  • Palm Springs specifics: longer intervals between rains can shift maintenance timing; annual plans help avoid surprise failures during peak outdoor water use.
  • Typical cost: $20–$60 per month, or $200–$600 annually depending on the provider and services included.
  • What to prepare: desired service cadence and any existing system notes.

Note: Costs vary by tank size, access, soil conditions, and permit requirements. Local travel fees, disposal charges, and permit fees can affect total. For authoritative guidance, refer to state and county resources on onsite wastewater systems. https://www.cdph.ca.gov/