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Maintaining a Septic System: What Owners Forget
Updated: 2 days ago
Out of sight is the whole problem. A septic system sits underground, makes no noise, sends no bill, and does its job for years without a thought from anyone in the house. Then a wet winter arrives, the yard gets soggy in one particular spot, and the conversation changes.
Across the rural parts of San Luis Obispo County, from the ranch lots outside Paso Robles to the hillsides above Arroyo Grande to the canyons near Cambria, we see the same handful of oversights again and again. Here is what owners forget, and what to do instead.
COUNTRY LIVING
They forget where it is
Start here. A surprising number of owners cannot point to the tank or the leach field. That matters because you can crush a tank lid with a truck, compact a leach field with a shed, or plant a thirsty tree over the drain lines and never know it until the system fails.
Find the paperwork. The county's environmental health division keeps records of permitted systems, the seller's inspection from escrow usually includes a diagram, and a septic contractor can locate the components if nothing else exists. Then mark them.
A sketch on the same sheet where you keep your well information, as we describe in maintaining a well: the owner's yearly checklist, is enough. Keep the tank lids accessible; risers that bring the lids to grade are a modest upgrade that makes every future service visit cheaper.
PUMPING
They forget to pump
The tank collects solids. The solids build up. Eventually they reach the outlet and flow into the leach field, and once the leach field is clogged with solids the repair is no longer a pumping bill; it is a new drain field. Pumping on a regular schedule is the single most important thing a septic owner does.
How often depends on tank size, household size, and use. A large tank with two people can go much longer than a small tank with a family of five. A septic contractor will look at the sludge and scum layers when they pump and tell you what interval makes sense for your household.
Write the date on the utility-room sheet and set a reminder for the next one. Vacation homes and second homes on the Central Coast are the ones that get missed most, because nobody is there to notice.
INSIDE THE HOUSE
They forget what should not go down the drain
The tank is a living system. Bacteria break down the waste, and anything that kills the bacteria or does not break down at all shortens the system's life.
Keep out:
"Flushable" wipes, which are not.
Feminine products, cotton swabs, dental floss, paper towels.
Grease and cooking oil.
Coffee grounds and food scraps in volume; a garbage disposal on a septic system is a bad pairing, and if you have one, use it sparingly.
Harsh drain cleaners, large amounts of bleach, and antibacterial products in quantity.
Paint, solvents, pesticides, and pharmaceuticals.
Water softener backwash, in most designs, which should be routed elsewhere.
Additives that promise to "boost" the tank are generally unnecessary. A normally used tank has the bacteria it needs.
SPREADING THE LOAD
They forget about water volume
The leach field can only absorb so much per day. Overloading it with water is as damaging as overloading it with solids, and it is easier to do than people think.
Fix leaking toilets and dripping faucets promptly; a running toilet can send a great deal of water into the field.
Spread laundry across the week instead of doing six loads on Sunday.
Install efficient fixtures.
Keep roof downspouts, patio drains, and irrigation runoff away from the leach field. Winter is when Central Coast fields fail, and it is usually because the ground is saturated by storm water on top of the household load.
Do not irrigate over the field.
Our post on preparing your Central Coast home for winter storms covers drainage around the house; the same grading protects the septic.
THE LEACH FIELD
They forget the field is fragile
A leach field is a network of perforated pipe in gravel trenches, a foot or two down. It is not a foundation.
No vehicles, trailers, or equipment parked on it, ever.
No structures, sheds, pools, or decks over it.
No trees with aggressive roots nearby. Willows, eucalyptus, and many ornamentals will find the pipe. Grass and shallow-rooted natives are the right cover.
No livestock penned on it; hoof compaction is a real problem on the horse properties we sell.
Keep the surface grassed and undisturbed so it can breathe.
If you are planning any project on a rural property, from a barn to an ADU, find out where the field and its reserve area are before you draw anything. The county requires a replacement area for many systems, and building over it can block a future repair.
WARNING SIGNS
They forget the warning signs
A septic system usually gives notice before it fails.
Slow drains throughout the house, not just one sink.
Gurgling in the plumbing.
Sewage odor near the tank or field, or inside.
Unusually green or wet grass over the field in dry weather.
Water backing up at the lowest drain in the house.
A high-water alarm, if the system has a pump chamber.
Any one of these is a call to a septic contractor, not a project for a weekend. Catching a clogged outlet filter or a failing pump early is inexpensive; waiting until the field is saturated is not.
ENGINEERED SYSTEMS
They forget the newer systems need more
Many properties in SLO County, especially on smaller lots, steep slopes, or poor soils, have engineered systems rather than a simple tank and field: pressure-dosed fields, mound systems, aerobic treatment units, or sand filters. These come with pumps, alarms, air compressors, and sometimes a required service contract with a certified provider.
Owners who inherit one from a previous seller and treat it like a conventional system are the ones who end up with a failed pump and a flooded chamber. Know which kind you have, and if it is engineered, keep the service contract current. Los Osos, which for decades was the county's most famous septic town, now has a community sewer; but the surrounding rural areas and most of the North Coast canyons still rely on individual systems, many of them engineered.
WHEN YOU SELL
Selling with a septic system
When a home with a septic system sells in SLO County, an inspection is customary, and a system that has been pumped, serviced, and documented is a system that passes without drama. We talk through the timing in selling a home with a well or septic: disclosures and timing. The short version: maintenance records are worth more than any assurance a seller can make.
Septic care is not complicated. It is remembering that there is something under the lawn that deserves ten minutes of your attention a year.
Your next step
Find your system, mark it, and check the date of the last pumping. If you cannot find that date, book a pump-out and inspection this season and start the record from there. If you are considering a rural home and want to understand what kind of system it has before you write an offer, ask us; it is one of the first questions we answer on any country property, and it is covered from the buyer's side in buying a home on septic: what inspections really tell you.
Talk With Kim & Kristen
We are Kim San Jule and Kristen Gentry, Broker Associates with Real Broker, serving San Luis Obispo County and the Central Coast. Whether you are buying, selling, or simply thinking ahead, we are glad to be a resource.
Kim San Jule · Broker Associate, DRE 01948144 · 805-345-8303 · kimsanjule@gmail.com
Kristen Gentry · Broker Associate, DRE 01968754 · 805-441-4618 · kristengentryslo@gmail.com
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