Frequently Asked Questions
Get answers to common septic system questions from the experts at I-5 Septic Services.
Categories
General Questions
3 questions
A septic system treats wastewater on-site. Wastewater flows from your home into the septic tank, where solids settle to the bottom (sludge) and oils float to the top (scum). Bacteria break down some of this waste. The liquid (effluent) flows out to the drain field, where it percolates through soil that naturally filters and treats it before reaching groundwater.
Signs you have a septic system include: no monthly sewer bill, your neighbors have septic systems, your property records mention a septic system, you can locate a septic tank lid in your yard, or you live in a rural area without municipal sewer service. You can also check with your local health department for records.
With proper maintenance, a well-designed septic system can last 25-30 years or more. The tank itself (concrete or plastic) can last even longer. Drain fields typically last 15-25 years. Regular pumping, avoiding harsh chemicals, and proper water usage are key to maximizing lifespan.
Pumping & Maintenance
4 questions
Most septic tanks should be pumped every 3-5 years, but this varies based on tank size, household size, and water usage. A family of 4 with a 1,000-gallon tank typically needs pumping every 3 years. We can assess your system and recommend an appropriate schedule.
Warning signs include: slow drains throughout the house, gurgling sounds in pipes, sewage odors near the tank or drain field, standing water or lush grass over the drain field, and sewage backing up into the house. Don't wait for these signs—schedule regular pumping to prevent problems.
Avoid: cooking grease/oils, coffee grounds, feminine hygiene products, wipes (even 'flushable' ones), cigarette butts, medications, harsh chemicals, paint, pesticides, and excessive amounts of household cleaners. These can clog pipes, kill beneficial bacteria, or damage your drain field.
While possible, garbage disposals increase solids in your tank and may require more frequent pumping. If you use one, pump your tank annually rather than every 3-5 years. Consider composting food waste instead to reduce strain on your system.
Problems & Repairs
4 questions
Sewage odors typically indicate: a full tank needing pumping, a failing drain field, broken or clogged pipes, or a damaged tank. This is a sign of a problem that needs attention. Contact us for an inspection—the sooner we diagnose the issue, the less expensive the repair usually is.
Common causes include: lack of regular pumping (solids reach the drain field), excessive water use overwhelming the system, driving/parking vehicles over the drain field, tree roots infiltrating pipes, improper design or installation, and age. Some drain fields can be restored; others need replacement.
Slow drains can indicate septic problems, but may also be simple clogs. If multiple drains are slow simultaneously, it's more likely a septic issue. Single slow drains are often local clogs. We can perform an inspection to determine the cause and recommend the appropriate solution.
Yes! Sewage backup is a health hazard and should be addressed immediately. Stop using water in your home and call us right away. We offer 24/7 emergency service for situations like this. Don't attempt to clean raw sewage yourself without proper protection.
Installation & Permits
4 questions
In Washington, new septic system costs typically range from $10,000 to $25,000+, depending on system type, soil conditions, property slope, and local requirements. Conventional gravity systems cost less than pressure distribution or advanced treatment systems. We provide free estimates with detailed breakdowns.
Yes, septic system installation and major repairs require permits from your local health department (Clark, Cowlitz, Lewis, or Thurston County). We handle all permit applications, soil testing, and inspections for you as part of our service.
The actual installation typically takes 2-5 days. However, the permit process takes 2-4 weeks before we can begin. Total timeline from initial contact to completed system is usually 4-8 weeks, depending on permit processing times and weather conditions.
The right system depends on your soil type (determined by perc test), property size, water table depth, and household size. Options include conventional gravity systems, pressure distribution systems, mound systems, and advanced treatment units. We evaluate your property and recommend the best solution.
Inspections & Real Estate
3 questions
Strongly recommended! A septic inspection reveals the system's condition and remaining lifespan. Repairs or replacement can cost $5,000-$25,000+, so knowing the system's status before purchase is essential. Many lenders and some counties require inspections for property transfers.
Our inspections include: locating and uncovering the tank, pumping and interior inspection, checking baffles and structural integrity, measuring sludge and scum layers, inspecting the drain field for signs of failure, and providing a detailed written report with photos and recommendations.
Septic inspection costs vary based on system type and accessibility. Contact us for current pricing. The cost is minimal compared to the potential expense of buying a property with a failing septic system. We provide same-day reports for real estate transactions.
Still Have Questions?
Can't find the answer you're looking for? Our team is happy to help with any septic questions.