Of 15,775 sale inspections that failed in Pierce and King counties, a third were resolved inside a month, and a quarter took more than two and a half years. The median fix takes about eight weeks, which is longer than most closing windows.
Based on property sale inspections filed with the Tacoma-Pierce County Health Department and King County Public Health: 116,746 inspections across 80,126 properties, 2007–2026.
Washington requires an inspection when a property on septic changes hands. What that inspection is called, who is allowed to sign it off, and how long it stays valid all depend on which county the property sits in, and the two counties do it differently enough that it is worth knowing before you list.
In Pierce County it is a Report of System Status, usually shortened to RSS, issued by the Tacoma-Pierce County Health Department. It is an inspection with all tanks pumped, followed by the department's sign-off. An RSS is valid for one year and cannot be renewed, so it needs to be scheduled against your actual closing date rather than done well in advance.
In King County the equivalent step is a property transfer inspection, filed with Public Health – Seattle & King County. It is waived if one was already done in the previous twelve months and the property has not changed hands since, so an inspection you had for maintenance reasons can sometimes do double duty.
"RSS" is Pierce County's term. It is not a statewide label, and asking a King County inspector for an RSS will get you a blank look. If your property straddles the line, as parts of Milton and Pacific do, the county the parcel sits in is the one that decides.
| Pierce County | King County | |
|---|---|---|
| What it is called | Report of System Status (RSS) | Property transfer inspection |
| Filed with | Tacoma-Pierce County Health Department | Public Health – Seattle & King County |
| Tanks pumped as part of it | Yes | Not automatically |
| How long it is valid | One year, non-renewable | A prior inspection within 12 months can satisfy it |
| Who may sign it off | A certified operation-and-maintenance firm, for every system type | A certified firm; more permissive on the simplest systems |
We are a certified operation-and-maintenance firm in both counties, which means an inspection we carry out is one that can actually be filed. That is worth checking before you book anyone, because an inspection that cannot be filed does not move your sale forward.
Straight from the source. Both health departments publish their own guidance, and it is worth reading whichever applies to your address before you book: Report of System Status from the Tacoma-Pierce County Health Department, and Sales and transfers from Public Health – Seattle & King County.
Some sale inspections cannot be completed. The lids are buried and nobody can find them, the drain field is under a deck or a new patio, a component cannot be reached. The inspector files what they could see and records the rest as not evaluated. About one sale inspection in ten ends up in that state.
Those inspections fail more than twice as often as ones where everything could be examined.
| Measure | Figure | What it covers |
|---|---|---|
| Full inspections that failed | 16.9% | 80,841 sale inspections, 2015–2025 |
| Partial inspections that failed | 38.7% | 9,186 sale inspections where something could not be evaluated |
| The gap | 2.3× | Partial against full |
| Share of sale inspections that are partial | about 1 in 10 | 9,186 of 90,027 |
Read that carefully, because it is easy to over-claim. Uncovering a lid does not change the condition of your septic system. Some inspections are partial precisely because something is already wrong: a flooded tank nobody can open, a drain field that cannot be walked. The honest statement is that inspections which cannot see everything fail more than twice as often as inspections which can.
The practical advice survives that caveat intact. If your lids are buried, have them located and exposed before the inspection rather than on the day. If you do not know where your drain field is, find out. An inspector who can examine the whole system gives you a report that reflects the whole system, and if there is a problem you find out now rather than in a renegotiation.
Risers are the permanent version of this. A system with lids at grade never has this problem again, and it makes every future pump-out and inspection cheaper. Septic tank riser installation covers what is involved.
This is the question behind almost every search that lands on a page like this, and it is the one nobody can usually answer. Because failed inspections and the repairs that resolve them are both filed with the health department, it can be answered here.
Of 15,775 failed sale inspections, 75.4% were eventually resolved. But the timing splits into two groups with almost nothing in between.
| Resolved within | Share of failed sale inspections |
|---|---|
| 30 days | 33.8% |
| 60 days | 38.5% |
| 90 days | 40.7% |
| Ever | 75.4% |
A third are fixed inside a month: the repair happens, the sale completes, nobody remembers it a year later. After about ninety days the curve falls off a cliff. Look at the same data as time-to-fix and the split is stark: a quarter are done inside a fortnight, and a quarter take more than two and a half years.
25th percentile: 9 days. Median: 53 days. 75th percentile: 903 days. 90th percentile: 1,751 days.
There is essentially no middle. Either it is a quick repair and the deal proceeds, or the deal collapses and the problem sits for years until somebody else deals with it. Which of those you get is decided largely by how much time you have when the problem surfaces.
That is the whole argument for inspecting early, in one line: the median fix takes about eight weeks, which is longer than most closing windows. An inspection done when you decide to sell, rather than when you are under contract, turns a deal-breaker into a repair.
The share of sale inspections that find a problem has risen for most of the past decade. The number of inspections tracks the housing market, rising and falling with sales volume; the failure rate does not follow it.
| Year | Sale inspections | Found a problem |
|---|---|---|
| 2015 | 8,271 | 13.8% |
| 2018 | 9,009 | 17.9% |
| 2021 | 10,071 | 20.8% |
| 2023 | 5,613 | 22.8% |
| 2024 | 6,297 | 24.9% |
| 2025 | 6,382 | 23.3% |
We state that as an observation, not an explanation. The records show failures at sale becoming more common. They cannot tell us whether the region's septic systems are deteriorating, whether inspectors and health departments are applying tighter standards than they did in 2015, or some of both. Anyone who tells you which of those it is, without the evidence to separate them, is guessing.
What it means for a seller is the same either way: the odds of a clean report are worse than they were when you bought the house, and roughly a quarter of sales now hit a problem at the point in the transaction where it is most expensive to discover.
Septic system repair carries the wider picture on deficiencies and how long they take to resolve across all inspection types, not just sales.
The two counties are not close. Across sale inspections filed between 2015 and 2025, 24.5% in King County found a problem, against 15.0% in Pierce County. A King County seller is roughly 1.6 times as likely to hit a problem at sale as a Pierce County one.
These are rates per inspection filed, which is the only fair way to compare the two. The counties record different things in different ways and their properties are observed over different spans, so counting deficiencies per property would flatter whichever county files less.
| County | Sale inspections | Found a problem |
|---|---|---|
| King County | 39,664 | 24.5% |
| Pierce County | 50,363 | 15.0% |
Within King County, where the health department records the system type for 99.3% of sale inspections, the worst performer is the simplest and most common kind of system.
| System type | Sale inspections | Found a problem |
|---|---|---|
| Gravity | 27,517 | 26.4% |
| Complex / proprietary | 5,940 | 22.2% |
| Pressure distribution | 5,946 | 18.6% |
We publish the same pair on our repair page, measured over the same 2015–2025 window, so the two agree. A wider window covering 2007 onwards gives slightly lower rates for both counties, because the earliest years carry a lower failure rate and the records only get dense enough to trust from about 2013. We have used the narrower, better-recorded window throughout.
What it does not tell you is why. Older systems, different soils, different housing stock and two health departments applying their own rules all sit inside that gap, and the records cannot separate them.
We publish that for King County only, and the reason is worth stating. Pierce County records the system type for just 27.3% of its sale inspections, against King's 99.3%, and the Pierce records that do carry a type are not a fair sample of the rest. Inspections with a recorded type failed 17.4% of the time; those without, 14.1%. So a Pierce figure broken down by system type would describe the best-documented quarter of the county rather than the county, and we have left it out rather than dress it up.
Forty-three towns had at least 300 sale inspections filed between 2015 and 2025. That threshold matters: it is why the list starts where it does rather than with Tukwila, which fails more often than any town here on a smaller number of inspections. The first figure is the one everybody looks at; the second is the one worth acting on.
Read the failure column with the county gap in mind. Of the twenty worst towns, nineteen are in King County, and the fourteen best are all in Pierce. The table is largely the county difference at finer grain rather than forty-three separate local findings, so a town's position says more about which county it is in than about that town.
The last column does not follow that pattern at all, which is what makes it useful. It is the share of sale inspections that could not be completed: buried lids, a drain field nobody could get to. Kirkland at 23.8% and Bellevue at 20.4% are the highest in the region, against 5.2% in Bonney Lake and 5.5% in Roy. That is not a statement about the systems; it is a statement about access, and access is the part a seller controls.
| Town | County | Sale inspections | Found a problem | Could not be completed |
|---|---|---|---|---|
| Burien | King | 949 | 35.3% | 13.9% |
| Des Moines | King | 395 | 33.2% | 12.2% |
| Kirkland | King | 508 | 33.1% | 23.8% |
| Seattle | King | 800 | 30.9% | 16.9% |
| Federal Way | King | 1,851 | 30.9% | 13.9% |
| Renton | King | 3,301 | 28.2% | 11.2% |
| Bellevue | King | 774 | 27.6% | 20.4% |
| Kent | King | 2,922 | 26.0% | 12.7% |
| Snoqualmie | King | 328 | 25.9% | 16.2% |
| Auburn | King | 3,857 | 25.7% | 14.8% |
| Covington | King | 860 | 25.2% | 10.5% |
| Sammamish | King | 1,750 | 24.5% | 16.9% |
| Black Diamond | King | 461 | 23.2% | 10.0% |
| Carnation | King | 912 | 23.0% | 11.0% |
| Woodinville | King | 4,082 | 23.0% | 13.5% |
| Issaquah | King | 1,964 | 22.6% | 16.7% |
| Fall City | King | 813 | 22.3% | 16.2% |
| Duvall | King | 730 | 22.2% | 12.5% |
| Maple Valley | King | 1,961 | 21.6% | 9.8% |
| Redmond | King | 2,533 | 21.6% | 15.7% |
| Lakewood | Pierce | 514 | 21.0% | 7.8% |
| Tacoma | Pierce | 4,184 | 20.1% | 8.0% |
| North Bend | King | 1,946 | 20.0% | 12.2% |
| Edgewood | Pierce | 1,651 | 18.5% | 9.0% |
| Vashon | King | 1,727 | 18.0% | 10.4% |
| University Place | Pierce | 778 | 18.0% | 8.7% |
| Puyallup | Pierce | 1,525 | 17.7% | 7.5% |
| Lake Tapps | Pierce | 2,182 | 17.4% | 9.3% |
| Spanaway | Pierce | 4,581 | 17.3% | 6.5% |
| Ravensdale | King | 563 | 16.2% | 5.9% |
| Enumclaw | King | 1,624 | 15.9% | 8.2% |
| South Hill | Pierce | 6,031 | 15.9% | 5.9% |
| Bonney Lake | Pierce | 3,569 | 14.8% | 5.2% |
| Graham | Pierce | 4,712 | 13.9% | 6.3% |
| Gig Harbor | Pierce | 9,512 | 13.4% | 10.5% |
| Orting | Pierce | 1,176 | 13.3% | 5.8% |
| Lakebay | Pierce | 1,297 | 12.3% | 9.9% |
| Eatonville | Pierce | 1,495 | 11.8% | 7.5% |
| Buckley | Pierce | 1,812 | 11.8% | 6.2% |
| Roy | Pierce | 2,327 | 11.2% | 5.5% |
| Fox Island | Pierce | 846 | 10.6% | 11.1% |
| Longbranch | Pierce | 317 | 9.8% | 9.8% |
| Anderson Island | Pierce | 572 | 7.3% | 4.5% |
Why the higher South King County failure rates? Tukwila fails at 42.4%, higher than any town in the table, and absent from it only because its 125 inspections fall below the 300 we set as a threshold. Below it, Burien at 35.3%, SeaTac 33.5%, Des Moines 33.2%, Normandy Park 32.8%, then Federal Way and Seattle at 30.9%, Renton 28.2%, Kent 26.0%, and Auburn 25.7%. This is a contiguous corridor through south King County. Vashon is the instructive exception: also King, also shoreline, and half the rate at 18.0%.
It is not the mix of system types: that accounts for well under a tenth of the gap, and Burien's gravity systems on their own fail at 36.2% against 26.1% for gravity elsewhere in King. It is not one strict inspector: at least eight different companies work the area, and every one of them fails it above its own King-wide average. And it is not access issues or thin records, both of which sit within half a point of the King average.
The most likely explanation? Along that corridor almost everyone is on sewer, so a house still on septic is usually one that couldn't connect: small lots, awkward ground, a connection nobody could afford. The same things that make a septic system struggle. In Graham or Gig Harbor, where failure rates are low, septic is the standard and the sites are ordinary; along the corridor, septic is the exception and the sites are the leftovers.
If you are selling in one of those towns, that does not mean your system is doomed. It means the odds are worse for reasons that predate you, so find out early, while there is still time to fix anything the inspection turns up before a sale depends on it.
If your property is in one of the towns at the top of the last column, the most useful thing you can do before the inspector arrives is make sure every lid and every component can actually be reached. An inspection that has to record a component as not evaluated is the one that fails more than twice as often.
Towns are as recorded by the health departments, which do not always match postal addresses: South Hill, Lake Tapps and Spanaway are recorded separately from Puyallup, for instance. Each town links to what we do there.
The obvious move before listing is to get the system serviced and assume that settles it. The records do not support that, and we would rather say so than sell you a certainty that is not there.
| Measure | Figure | What it covers |
|---|---|---|
| No service history on record | 20.1% | Share of sale inspections that failed |
| Serviced within the past year | 16.9% | Share of sale inspections that failed |
| The improvement | 3.2 points | Smaller than most people expect |
| Serviced within a year and still failed | about 1 in 6 |
A 3.2-point gap is a real improvement and worth having. It is not a guarantee, and the pattern does not get reliably better the more recently the system was serviced. The group serviced within the past year also includes people who deliberately serviced the system because they were about to list, and around one in six of them still failed.
So the argument for acting early is not "service it and you will pass". It is inspect early enough that you still have time to fix whatever it finds. Servicing improves your odds. Time is what protects your closing date.
We are a certified operation-and-maintenance firm in both counties, so an inspection we carry out is one that can be filed: a Report of System Status in Pierce County, a property transfer inspection in King County. If the inspection finds a problem, the technician who found it will set out your options and what each one costs before you decide anything, which is the part that matters when there is a closing date attached.
Real estate agents: our Preferred Partner Program is free, and exists for exactly this situation.
Certified in both counties, so the report can be filed where it needs to go.
A technician who explains what they found and what the options cost, before anything is decided.
Available at any time, including weekends and holidays.
If you are selling a property on septic in King or Pierce County, the inspection is the one step you cannot skip, and the earlier it happens the more of your options stay open. Contact us to book a sale inspection, ask which report your address needs, or get a date in the diary before you list.
Yes, if the property is on septic. Washington requires an inspection when a septic property changes hands. In Pierce County that is a Report of System Status (RSS) from the Tacoma-Pierce County Health Department, which includes pumping the tanks. In King County it is a property transfer inspection, which is waived if one was already done in the previous twelve months and the property has not changed hands since.
A Pierce County RSS is valid for one year and cannot be renewed, so it is worth scheduling against your actual closing date rather than doing it far in advance. In King County, an inspection from the previous twelve months can satisfy the transfer requirement.
The problem has to be resolved before the sale completes. Of failed sale inspections, 33.8% were resolved within 30 days and 40.7% within 90 days, but 75th percentile resolution runs to 903 days, because deals that collapse leave the problem unfixed for years. The median is 53 days, about eight weeks.
The median is 53 days from the failed inspection to a filed repair. A quarter are resolved within 9 days. The spread is very wide: the slowest quarter take more than two and a half years, which usually reflects a sale falling through rather than a repair taking that long.
It is the single most useful thing you can do, because it converts a deadline problem into a repair problem. The median fix takes about eight weeks, longer than most closing windows, so a problem found while you are under contract is far more likely to cost you the sale than the same problem found before you list.
No. Systems with no service history on record failed 20.1% of the time; systems serviced within the past year failed 16.9%. That is a real improvement but not a guarantee: around one in six systems serviced within the year still failed. Servicing improves your odds; having enough time to fix what is found is what protects your closing date.
A partial inspection is one where something could not be accessed or evaluated: commonly buried lids, or a drain field under a deck or landscaping. About one in ten sale inspections is partial, and those fail 38.7% of the time against 16.9% for full inspections. Uncovering a lid does not change your system's condition; some inspections are partial because something is already wrong. But having the lids located and exposed beforehand means the report reflects the whole system.
No. RSS, Report of System Status, is Pierce County's term, issued by the Tacoma-Pierce County Health Department. King County's equivalent is a property transfer inspection, filed with Public Health – Seattle & King County. The requirements differ, and the county the parcel sits in is the one that decides. We are certified in both.
About this analysis. Washington requires an inspection when a property on an on-site septic system changes hands, and that inspection is filed with the county health department as a public record. Because nobody selling a septic property can skip it, these records are a near-complete census of a defined event rather than a survey sample: there is no response bias and nothing is self-reported.
This analysis covers 116,746 sale inspections across 80,126 properties in Pierce and King counties, 2007–2026, as recorded by the Tacoma-Pierce County Health Department and King County Public Health. Year-by-year and completeness figures are drawn from 2015–2025, the window where recording is consistent enough to compare across years.
Definitions. A sale inspection is one filed against a property sale rather than a routine maintenance cycle. "RSS" is Pierce County's name for the resulting report and is not a field in the records themselves. A failure is an inspection filed with a deficient status; severity is not recorded, so a failure may be anything from a missing riser lid to a collapsed drain field. A partial inspection is one where a component could not be accessed or evaluated.
What these figures cannot tell you. Resolution times are measured from a failed inspection to a filed repair, so work completed without a follow-up filing is not counted: the 75.4% resolved is a floor, not a ceiling. The rise in failure rates cannot be separated into deterioration versus tightened standards. And the comparison between serviced and unserviced systems is observational: people who service a system before listing are not a random sample of sellers.
A Spanaway inspection that turned up gaps where the risers meet the tank, at the inlet connection and around the others, with root intrusion at both compartments. The tank did not need pumping, and a toilet flushed before we left came through strongly. Resealing all the risers is the recommendation.
A Tacoma tank that had gone a long time without being pumped. The customer had opened the first compartment; we excavated the second to reach the whole tank, crust busted through a heavy build-up of solids, and pumped approximately 1,125 gallons — a job that took considerably longer than usual because of the condition inside.
A two-compartment tank in University Place with risers on every access point but the outlet. The transport line at the outlet was completely submerged, pointing at a drainfield beginning to struggle, and root intrusion was found where the risers meet the tank. We pumped approximately 1,125 gallons and stress tested the system.
An inspection and pump assessment on Anderson Island. The drawdown test came in at about 0.75 inches per minute against roughly 1 expected, and the pump tank showed massive root intrusion. Risers were recommended on all tanks.
A high-level alarm at a Gig Harbor property with the pump tank flooded. We pumped the pump tank and about 1,125 gallons from the septic tank, and the inspection found a pump that would not activate, an unsealed junction box, root intrusion and lid damage.
A camera inspection checked the drain field against the property's as-built drawing, confirming five lateral lines running almost to the fence. We opened the valves for even dispersal, pumped the tank and pump basin, and replaced the tank lids.
Upfront Septic recently completed a septic system inspection and maintenance service for a homeowner in Gig Harbor, WA. The project included a comprehensive inspection of the on-site sewage system to evaluate the condition and performance of the entire system, helping ensure it was operating safely and efficiently. As part of the visit, our technicians pumped […]
A homeowner in Maple Valley recently scheduled a comprehensive septic system inspection as part of the process of selling their home. Septic inspections are an important step during a real estate transaction, giving buyers confidence that the onsite wastewater system is functioning properly and helping sellers address any concerns before closing. Our technicians located the […]
Our team recently completed a septic system inspection and excavation project for a homeowner in Kent, WA. The property had multiple buried access lids that required careful excavation to fully inspect the system and determine its overall condition. After locating and uncovering the septic tank and access points, we pumped the tank to remove accumulated […]
King County Public Health inspected food businesses 71,580 times between January 2024 and September 2026, and closed 27 of them. For restaurant plumbing the real risk is not the citation - it is the backup that stops service, and the closure that follows.
What Is a Sump Pump Used For? A Practical Guide for Washington Homeowners What is a sump pump used for? It removes excess water collecting beneath or around the lowest part of a home before that water spreads across a basement floor or soaks a crawl space. In homes dealing with heavy rain, saturated soil, […]
Tacoma Grease Trap and FOG Compliance Laws: How Restaurant Owners Can Stay Compliant Running a restaurant in Tacoma means managing more than great food and customer service. Food service establishments must also comply with local Fats, Oils, and Grease (FOG) regulations designed to protect the city’s wastewater system. Failing to maintain your grease interceptor can […]
Can You Put Egg Shells in the Garbage Disposal? A clean kitchen is built on simple daily habits, but one common question continues to confuse homeowners: can you put eggshells in the garbage disposal? You may have heard that eggshells sharpen the disposal blades, while others insist they damage the system. With so much conflicting […]
How to Unclog a Garbage Disposal with Standing Water? When your kitchen sink fills instead of draining, it can feel like your entire day has come to a standstill. The good news is that many garbage disposal issues can be solved with a few simple techniques before you ever need professional help. A clogged garbage […]
