If your home sits outside the sewer and water districts, north toward Battle Ground and Yacolt, east toward Camas and Washougal, or anywhere across unincorporated Clark County, your sale has a layer that suburban sellers never encounter. A well and a septic system are not just features of the property. They are regulated systems with records, inspection schedules, and county rules that attach at specific moments in your sale.
Most national real estate advice on this topic is useless here, because these rules are county-level and Clark County's are its own. Some of the advice circulating is worse than useless, because it is confidently wrong. Here is what actually applies.
Start Here: You Need the Septic Report Before You List
This is the single most misunderstood requirement in Clark County, and it catches sellers constantly.
Clark County Code 24.17.180 requires that a current report of system status be on file with Clark County Public Health when a property served by a septic system is offered for sale. A report is current if it was completed within one year of the date of sale.
Read the trigger again: offered for sale. Not closing. Not during the inspection period. When you list.
That is a genuinely different sequence from how most people assume this works. The common mental model is that septic gets dealt with in escrow, alongside the home inspection, once there is a buyer. In Clark County the obligation attaches the day your home hits the market. If you list without a current report on file, you are out of compliance from day one, and you will end up scrambling to fix it under deal pressure instead of on your own schedule.
There is a second piece. At transfer you must give your buyer a copy of the current inspection report on file, any maintenance records you have, and a record drawing if one is not already filed, along with your standard seller disclosure.
The Practical Version
Get the septic inspected and the report filed with Clark County Public Health before your home goes live. Not after you have an offer. Doing it early costs you nothing extra, removes a compliance problem, and turns a potential buyer objection into a document you hand over with confidence.
What Changes on February 1, 2027
Washington adopted a statewide rule that takes effect soon, and Clark County has already written it into local code.
Beginning February 1, 2027, WAC 246-272A-0270 requires a property transfer inspection performed by a third-party inspector authorized by the local health officer. The rule allows the local health officer to remove that requirement where there is evidence the system complies with routine operation and maintenance and was already inspected by an authorized third-party inspector.
The practical read: the direction of travel is toward more formal, independently verified inspections at sale. If you are selling in 2026, you are under the current county rule. If your timeline slips into 2027, plan for the newer standard. Either way, the answer is the same. Get ahead of it.
What the Inspection Actually Covers
A transfer inspection is more than a look in the tank. Under the state rule and the mirroring county code, it covers the tank, baffles, filter, scum and sludge levels, and watertightness; lids, accesses, and risers; failure indicators on both the system and the reserve area; distribution boxes; a review of the record drawing and prior reports; and any procedures specific to proprietary products.
It also has to include the property address, inspection date, the permitted system type and design flow, and verification that the record drawing is accurate, or a site plan if no drawing exists. That last item is where a routine inspection turns into a project, and we will come back to it.
Your Ongoing Maintenance Schedule
Separate from any sale, Clark County sets operation and maintenance frequencies by system type: conventional gravity systems every three years, pressure distribution every two years, and annually for everything else. Reports are due to the county within 15 calendar days of the inspection.
Homeowners may self-inspect simple gravity systems at most every six years, alternating with a certified specialist, and the first self-inspection is field-audited by the county.
If your system is overdue, deal with it now. The county has applied a non-compliance fee for systems more than a year overdue, and an overdue system is a worse conversation to have with a buyer than with a pumper.
Who Can Actually Do the Work
Here is a Clark County specific that trips up sellers who call a company from a neighboring county: inspectors, pumpers, and installers must be certified by Clark County Public Health, not merely licensed by the state. Certification runs through exams administered with the Washington On-Site Sewage Association, renews annually on March 1, and requires bonding or contractor registration plus continuing education and a conflict-of-interest disclosure.
The county publishes current lists of certified inspectors, pumpers, installers, and designers. Use them. A report from someone not certified in Clark County does not satisfy the county requirement, and finding that out during escrow is an expensive way to learn it.
On cost, the county's own guidance describes a basic inspection by an operation and maintenance provider in a range of roughly $99 to $115, more depending on system type. We would treat that as a starting reference rather than a quote, since that figure is not dated and complex systems run higher. Call a certified provider for a real number.
The Records Problem, and How to Solve It
Clark County septic records are searchable through the county's Property Information Center. Look up your address or tax account and open the Environmental tab for as-builts, permits, and inspection reports.
Now the catch that affects a large share of rural Clark County homes: records are online from November 2007 forward. If your system was installed in 1994, there may be nothing there.
This is common, it is not your fault, and it is fixable. Clark County Public Health has a process for exactly this, a locate and record drawing for existing systems with no records or permit. The point is that it takes time. Your inspector has to verify the drawing is accurate or produce a site plan where none exists, and you cannot do that in the ten days of an inspection contingency while a buyer taps their foot.
If you have an older system and no paperwork, start this the month you decide to sell, not the week you list.
Wells: What the Law Requires Versus What Your Buyer's Lender Requires
Here is the distinction almost every article on this topic blurs.
No Washington law and no Clark County ordinance requires you to test your well water because you are selling. Clark County requires testing for coliform bacteria, arsenic, and nitrate on new and replacement wells, performed by a state-certified lab. Washington's Department of Health frames testing at sale as something a county or a lending institution may require, not something the state mandates.
So water testing at sale is a financing question. It lands on your deal through your buyer's loan, which means the answer changes depending on who your buyer turns out to be.
Test Anyway
The state recommends private well owners test annually for coliform bacteria and nitrate, and test for arsenic at least twice during ownership, once in summer and once in winter. Doing this before you list means you find out on your own terms. Discovering a water problem after mutual acceptance hands your buyer leverage and a reason to renegotiate.
What FHA Actually Requires
If your buyer uses FHA financing, HUD's handbook governs, and it is specific.
FHA does not test every well. A water test is required for properties that are newly constructed, where the appraiser reports deficiencies with the well or its water, where water is reported or known to be unsafe, where the property sits near dumps, landfills, industrial sites, or farms, or where the distance between the well and the septic system is less than 100 feet.
FHA's setbacks for existing construction: 10 feet from the property line, 50 feet from the septic tank, and 100 feet from the drain field, with the drain field distance reducible to 75 feet if the local authority allows. The handbook adds that local requirements prevail where they are stricter.
On yield, FHA looks for three to five gallons per minute for existing construction, and five gallons per minute sustained over four hours for new construction. Testing must be done by a disinterested third party, and the handbook is explicit that the borrower, owner, or any other interested party may not collect or transport the sample.
A Correction About VA Loans
You will find a lot of pages online stating that VA requires 100 feet between well and septic, or a minimum of three to five gallons per minute. Those are FHA's numbers, misattributed.
The VA handbook's water supply provisions contain no gallons-per-minute minimum and no well-to-septic setback distance. What VA says is that water quality for an individual supply must meet the requirements of the health authority having jurisdiction, and that where the local authority has no specific requirement, EPA maximum contaminant levels apply. On sewage, VA requires that an individual system adequately dispose of domestic wastes without creating a nuisance or endangering public health.
Which leads somewhere useful rather than merely pedantic. Because VA defers to the local health authority, in Clark County the operative number for a VA buyer is the county's 100 feet, arriving through the county rather than through VA. You often land in the same place. But if you are negotiating with a VA buyer and someone waves a VA rulebook at you, know that the rulebook does not say what they think it says.
Conventional financing is more discretionary. Fannie Mae requires the appraiser to address effects on value and marketability, and a well certification where the lender has reason to believe contamination is a risk, but there is no standing test mandate.
The Setback Table That Decides Deals
Clark County Code 24.17.120, Table IV, sets minimum separations. From the edge of the soil dispersal component and reserve area, from the sewage tank and distribution box, and from the building sewer respectively:
- Well: 100 feet / 50 feet / 50 feet
- Public drinking water well: 100 / 100 / 100
- Decommissioned well: 10 feet, where decommissioned per state rule
- Property or easement line: 5 / 5
- Building foundation or in-ground pool: 10 / 5 / 2
- Surface water from the ordinary high water mark: 100 / 50 / 10
Two escape hatches are worth knowing. The county may reduce the well-to-drainfield separation to 75 feet and still call the system conforming, on signed health officer approval, where the applicant demonstrates protective site conditions such as confining layers, excessive depth to groundwater, a down-gradient contaminant source, or location outside the zone of influence, or demonstrates enhanced treatment performance, or both. That dovetails exactly with FHA's own 75-foot allowance.
The county may also increase separations for excessively permeable soils, unconfined aquifers, shallow or saturated soils, dug wells, and improperly abandoned wells. It runs both directions.
And note the decommissioned well line. A dry or unused well sitting too close to your drainfield is a nonconformity. Properly decommissioned, it needs only 10 feet. That is sometimes the cheapest fix available to a seller with a setback problem.
Arsenic and Nitrate: What the Data Actually Says
Since we are recommending you test, it is worth being straight about what you are testing for, because there is a lot of vague alarm on this subject.
Washington's Department of Ecology studied natural background arsenic across the state. The southwest basin, which includes Clark County alongside several neighboring counties, came back with a background threshold value of 4.9 micrograms per liter, the lowest of any basin studied, against a statewide range up to 15.4. Roughly 71 percent of samples were non-detect.
So arsenic here is a routine screening item, not a regional crisis. Clark County requires it on new wells and publishes fact sheets, which is prudent public health practice rather than evidence of a problem. On nitrate, the state's free testing programs target the Lower Yakima Valley and western Benton County. There is no Clark County nitrate finding we could substantiate.
Test your well because it is good practice and because your buyer's lender may ask. Do not let anyone tell you your groundwater is presumptively contaminated. The evidence points the other way.
Shared Wells
If your well serves more than one home, the rules tighten and the financing gets particular.
For FHA, a shared well may serve no more than four living units and must deliver at least three gallons per minute to each existing property simultaneously over a continuous four-hour period, demonstrated by a certified pumping test, or provide equivalent pressurized storage. Each dwelling needs a valve on its service line.
The agreement itself carries the most weight. FHA requires that the shared well agreement bind the signatories and their successors in title, be recorded in local deed records, permit sampling by the local authority, ensure continuity of service, prohibit non-domestic use, bar added connections without consent, and prohibit any party from locating any part of a septic system within 75 feet of the shared well. VA similarly requires a recorded agreement with a permanent easement and fair provision for maintenance costs, binding on successors.
The failure mode is predictable: a handshake arrangement between neighbors, honored for twenty years, never recorded. That is a financing stop. If you share a well and there is nothing in the public record, address it before you list.
What Actually Kills These Deals
In rough order of how often we see it:
- No current report of system status when you list. A compliance problem on day one, entirely avoidable.
- No as-built or record drawing. Pre-2007 systems often have nothing on file, and the locate process takes time you will not have in escrow.
- Well within 100 feet of the drainfield. Triggers a mandatory FHA water test and is a county nonconformity, survivable at 75 feet only with signed health officer approval.
- Failed inspection. The health officer can require a compliance schedule, and county code requires critical deficiencies corrected within 30 days. If the system has failed and public sewer is available within 200 feet along the most feasible route, the county may require connection instead of repair, unless connection costs more than twice a conforming replacement system.
- Low well yield. A real problem for an FHA buyer below three to five gallons per minute. Notably not a stated VA standard.
- Shared well with no recorded agreement. Stops financing on both FHA and VA.
Your Disclosure Obligations
Washington's seller disclosure statement, Form 17 under RCW 64.06.020, has dedicated sections for both systems, and they ask for more than people expect. You must deliver it within five business days of mutual acceptance unless you agree otherwise, and your buyer then has three business days to rescind.
The water section asks about your source and whether any sharing is covered by a written agreement, easements for access and maintenance, problems or needed repairs, whether the source has provided an adequate year-round supply of potable water during your ownership, treatment systems, water rights and whether they have been unused for five or more successive years, and defects in pipes, tank, or pump.
The sewer section asks whether a permit was issued and approved after construction, when the system was last pumped, defects in operation, when it was last inspected and by whom, how many bedrooms it is approved for, whether all plumbing including laundry is connected, changes or repairs, whether the system and drainfield sit entirely within your property boundaries, and whether it needs maintenance more than annually.
Two of those deserve a flag. The bedroom count matters because a system approved for three bedrooms under a home marketed as four is a live problem. And a drainfield crossing onto a neighbor's parcel is more common in rural Clark County than you would think, and it is exactly the kind of thing a transfer inspection surfaces.
Form 17 is an actual-knowledge disclosure. It does not itself require you to inspect anything. But answering it honestly is much easier when you have a current report in hand, which is one more argument for doing this early. Our Form 17 guide covers the document in full.
Unused Wells and Connecting to Public Systems
State rule requires that any well which is unusable, abandoned, permanently out of use, or in such disrepair that continued use is impractical or hazardous shall be decommissioned. Ecology directs property owners to work with licensed drillers to do it, and state law requires notifying the department at least 72 hours before beginning decommissioning, including the contractor's name and license number.
Ecology's Well Report Viewer is a useful place to hunt for well logs and construction records if you do not have yours.
If public sewer has reached your area, note the rule mentioned above: on failure of an existing septic system, connection is generally required where sewer is available within 200 feet along the usual or most feasible route, unless the total cost exceeds twice the cost of a conforming replacement system or the utility will not allow connection.
The Bottom Line
A well and septic do not make your home hard to sell. Clark County buyers expect them outside the districts, and a well-documented system is a non-event in a transaction. What makes these sales hard is discovering the paperwork problem after you are under contract, when the timeline belongs to someone else.
The sequence that works: pull your records from the county portal, get a certified inspector out and the report filed before you list, test the well on your own schedule, chase down the as-built now if there isn't one, and record any shared well agreement that lives only in memory. Every one of those is cheap and calm in June and expensive and frantic in escrow.
If you are thinking about selling an acreage or rural property in Clark County, we can walk your specific situation before you spend a dollar. Get a free broker estimate and we will tell you what your system needs and what your home would bring.
Frequently Asked Questions
Do I need a septic inspection to sell my house in Clark County?
Yes. County code requires a current report of system status on file with Clark County Public Health when a property served by septic is offered for sale, current meaning completed within one year of the sale date. The trigger is listing, not closing, so have it done before you go to market.
What is changing for septic inspections in Washington in 2027?
Beginning February 1, 2027, state rule requires a property transfer inspection by a third-party inspector authorized by the local health officer. Clark County has already adopted the language. The health officer may remove the requirement where there is evidence of routine maintenance compliance and a prior authorized inspection.
Is well water testing required when selling a home in Washington?
No state law or county ordinance requires it simply because you are selling. Clark County requires coliform, arsenic, and nitrate testing on new and replacement wells only. Testing at sale is a lender requirement, so what applies depends on your buyer's loan type.
How far does a well have to be from a septic drainfield in Clark County?
County code requires 100 feet from the edge of the soil dispersal component and reserve area, and 50 feet from the tank and building sewer. The health officer may allow 75 feet with signed approval where site conditions or enhanced treatment justify it. A properly decommissioned well needs only 10 feet.
What if there are no septic records for my property?
Common for older systems, since county records are online from November 2007 forward. Clark County Public Health has a locate and record drawing process for systems with no records. Start it early, because the transfer inspection must verify the drawing or produce a site plan.
Avenir Gedarevich
Avenir is the Designated Broker of Vancouver Property Group, serving home sellers across Southwest Washington and Clark County. Managing Broker License #24033559, Vancouver Property Group LLC, WA Real Estate Firm License #25011405.