Quick answer
EPA says a typical household septic system should be inspected by a septic professional at least every three years, and systems with pumps, floats or other mechanical parts more often, generally once a year. Tanks are typically pumped every three to five years. Between visits, the job is mostly habits: use water efficiently, flush only human waste and toilet paper, keep grease and chemicals out of the drains, and protect the drainfield. In Santa Cruz County, water softener and drinking water filter discharge must not go to the septic system at all.
How a septic system works
Most residential systems have two main parts. The septic tank is a buried, watertight container where solids settle to the bottom as sludge and grease and oils float to the top as scum. The drainfield is a shallow, covered area in the soil where the liquid from the tank is dispersed and treated. Some systems also include enhanced treatment units, pumps and alarms, which need more frequent service. Our guide to septic system components walks through each part.
Knowing where your tank, lids and drainfield are makes every other step easier. Keep a simple sketch and your service records with your house papers.
Inspection and pumping
EPA's intervals are the baseline:
- Conventional systems: inspected at least every three years.
- Systems with pumps, floats or mechanical parts: inspected more often, generally once a year.
- Emptying the tank: typically every three to five years.
How often your tank needs pumping depends on household size, the total wastewater the home generates, the volume of solids in that wastewater and the size of the tank. An inspection measures the sludge and scum layers so pumping happens when it is actually needed, and checks baffles, filters, pumps and alarms along the way. Homes with a garbage disposal put more solids into the tank, and EPA notes those tanks need pumping more often.
Use water efficiently
Every gallon that goes down a drain goes through the tank and into the drainfield. EPA notes that a single leaky or running toilet can add as much as 200 gallons of water per day, and that older toilets use 3.5 to 5 gallons per flush while high-efficiency toilets use 1.6 gallons or less.
- Fix running toilets and dripping faucets promptly.
- Spread laundry across the week instead of doing it all in one day.
- Run the dishwasher and washer only with full loads.
- Choose high-efficiency toilets, showerheads and appliances when you replace them.
Water softeners and filters in Santa Cruz County
Santa Cruz County's sewage disposal ordinance says discharge from water softeners, drinking water filters and other non-domestic sources shall not be discharged to the septic system. County Environmental Health warns that softener brine can harm the bacteria in the tank and clog the leach field. If you have or plan a softener or reverse osmosis system on a septic property, the discharge needs a separate, approved destination. Our salt water softener guide covers the options.
What never goes down the drain
EPA's rule is that your septic system is not a trash can. Only human waste and toilet paper should be flushed. Keep these out of toilets and drains:
- Cooking grease and oil
- Wipes of any kind, including ones labeled flushable
- Diapers, paper towels and feminine products
- Cat litter
- Pharmaceuticals
- Household chemicals, paint and solvents
Limit garbage disposal use and put food scraps in the trash or compost.
Protect the drainfield
- Do not park or drive on the drainfield.
- Plant trees far enough away that roots do not reach the system. A septic professional can advise on distance for your site.
- Keep roof drains, sump pumps and other rainwater drainage away from the drainfield.
Rain matters here. Santa Cruz County's wet season saturates soil, and a drainfield in soggy ground has less room for household water. Our rainy season septic prep checklist covers what to check before the storms.
Warning signs
Have the system checked if you notice:
- Slow drains or backups, especially in several fixtures at once
- Gurgling in drains or toilets
- Sewage odors indoors, near the tank or over the drainfield
- Wet, spongy ground or standing water over the drainfield
- Unusually green grass over the drainfield when the rest of the yard is dry
- A high water alarm on systems with a pump
Our post on septic trouble signs explains what each one usually means.
Frequently asked questions
How often should a septic system be inspected?
EPA recommends an inspection at least every three years for a typical household system, and generally once a year for systems with pumps, floats or other mechanical parts.
How often does a septic tank need pumping?
Typically every three to five years, depending on household size, wastewater volume, solids and tank size. An inspection that measures the sludge and scum layers tells you when.
Can a water softener drain into my septic system in Santa Cruz County?
No. The county sewage disposal ordinance says softener and drinking water filter discharge shall not go to the septic system.
Are flushable wipes safe for septic?
No. EPA says only human waste and toilet paper should be flushed.
How is septic maintenance priced?
Flat rate, quoted on site before work begins.
Sources
- U.S. EPA, How to Care for Your Septic System
- Santa Cruz County Environmental Health, The Harmful Effects of Water Softener Discharge on Your Septic System
- Santa Cruz County Local Agency Management Program, Appendix A: Sewage Disposal Ordinance
Need help with septic maintenance?
Wade's Plumbing & Septic provides septic maintenance and care and septic inspections across Santa Cruz County and nearby Santa Clara County communities. Quotes are free and pricing is flat rate, quoted on site before work begins. Request service or call during office hours, Monday to Friday, 9:00 AM to 5:00 PM.
