Should I buy a house on septic in Washington County?

Buying a house on septic in Washington County is usually fine, provided you inspect the system properly and understand what you are taking on.

Septic is the normal arrangement outside municipal service areas here, which in practice means acreage, the unincorporated county, and the smaller communities. It is not a defect and it is not a reason to narrow your search. It is a system you now own and maintain yourself, and that is the whole of the adjustment.

How it works, in one paragraph

Waste leaves the house into a buried tank. Solids settle, liquid flows out into a drain field. A network of perforated pipe in gravel, where it filters through the soil. The soil does the treatment. Nothing about it requires your attention day to day, and everything about it requires your attention every few years.

That last sentence is the whole management problem. The system is invisible and silent until it is not.

What to inspect, specifically

A standard home inspection does not inspect a septic system. Like the other items that have to be requested by name in southern Utah, this is a separate inspection by someone who does it for a living.

What a proper inspection involves:

Locating and opening the tank. You cannot assess a tank you have not looked into. If the lids are buried under landscaping, they have to be dug out, which is worth knowing before the appointment.

Pumping it, usually. Many inspectors pump as part of the inspection, because you cannot see the tank walls or the baffles through a full tank.

Checking the baffles and the tank structure. Concrete deteriorates, baffles fail, and a failed baffle sends solids into the drain field, which is how fields die early.

Assessing the drain field. Soggy ground, unusually green grass in a dry month, or standing water over the field are all signs of failure. A field that has failed is the expensive repair.

A flow or loading test. Running water through the system to see how it handles volume.

The records. Ask the county health department what is on file. The permit, the design, the tank size and the as-built location. That tells you what was approved and whether what is in the ground matches it.

Pair it with a sewer scope on the line from the house to the tank. The tank can be perfect while the lateral reaching it is not.

The three things that actually go wrong

The system is at the end of its life. Tanks and fields last a long time and not forever. Age plus condition tells you where you are, and a replacement is a serious number.

The tank is undersized for the house. This catches people after a renovation. A system permitted for a three-bedroom house and serving a five-bedroom house after an addition is being asked to do more than it was designed for. Check the permitted capacity against what is actually there, particularly if bedrooms were added.

The lot cannot support a replacement field. This is the one that turns an expensive problem into an unsolvable one. If the existing field fails and there is no approved area for a new one, because of lot size, slope, soil, or distance from a well or property line. You have a house that cannot legally be occupied until it is resolved. Ask whether the lot has a designated replacement area. On acreage and land purchases this question comes before almost everything else.

What it costs to own

Pumping every few years is the main recurring cost, and the interval depends on tank size and household. It is modest, and skipping it is how a cheap maintenance item becomes a drain field replacement.

Beyond that, septic ownership is mostly a set of habits:

• No wipes, no grease, nothing that does not break down, regardless of what the packaging claims
• Be careful with heavy bleach and drain chemicals, which work against the bacteria doing the treatment
• Keep vehicles and heavy equipment off the drain field
• Do not plant trees near it, because roots find it
• Do not build over it, and know where it is before you landscape

Against that, you have no monthly sewer bill, which over years is not nothing.

Septic usually travels with other things

A property on septic is frequently also on a well, and the two sets of homework go together. What to verify on a property with a well covers the water side, including the distinction between a well and a water right that catches so many buyers.

There is also a separation requirement between a septic system and a well, which is a reason to know exactly where both are rather than roughly. The county health department holds the records.

If you are looking at the communities north of St. George, expect both questions on most properties.

What happens if sewer arrives later

Worth asking, because Washington County is growing outward and service areas move.

When a municipal sewer main is extended past a property that has been on septic, the owner is not always free to carry on as before. Depending on the jurisdiction and the circumstances, connection can become required, either immediately or when the existing system fails. There may also be a connection fee and the cost of running the lateral from the house to the main, which on a large parcel is a meaningful distance.

That is not a reason to avoid a septic property. It is a reason to ask two questions before you buy: whether the property sits inside a planned service area, and what the policy is if a main reaches it.

The city or the special service district that would provide the service can tell you. It is a phone call, and the answer occasionally changes how you think about a lot, particularly a large one where the lateral run would be long.

The upside case exists too. A property that can connect later has a path if the septic system fails, which is worth something compared with one that has no option but to rebuild in place.

Who this suits

It suits anyone buying for land, space or quiet, who is comfortable with a maintenance schedule and happy to keep records.

It does not suit a buyer who wants everything handled by a utility, or anyone who will not keep up with pumping. Septic punishes neglect specifically.

I am Kelsey Earl, a Realtor with Keller Williams South Valley. What I actually see is buyers treating septic as a scary unknown and then owning one uneventfully for a decade, and the ones who had trouble almost always skipped the inspection or inherited a system nobody had pumped in years.

What to do with this

Order a septic inspection as a named item during due diligence, and have the tank opened and pumped as part of it.

Pull the county records and confirm the permitted capacity matches the house as it stands today.

Ask whether the lot has an approved replacement area, and treat a no as a serious finding.

If you want help reading a septic report before your deadline, send it to me.