How much does a septic drain field cost in Kent, WA?
| Typical total$15.03 per ft² of drain field | $9,016 |
|---|---|
| Range you should see in bidsthree bids on the same scope normally land inside this | $5,549 – $17,339 |
| Labor portion55% of the job — this is the part that moves by city | $4,959 |
| Material portion45% — bought at national prices | $4,057 |
| Septic Tank Servicers and Sewer Pipe Cleaners pay near Kentabout $33/hr · Seattle-Tacoma-Bellevue, WA metro | $68,670/yr |
| U.S. mean for the same tradeSOC 47-4071 | $53,500/yr |
| Versus the national pricetrade pay here runs +28.4% against the U.S. mean | +$1,216 |
Notes
- Where the number comes from. The national price for a septic drain field replacement is $13.00 per ft² of drain field — drain field replacement pricing published for 2026, $8–$25 per ft² of field. Labor is about 55% of that. Septic Tank Servicers and Sewer Pipe Cleaners near Kent, WA average $68,670 a year against a U.S. mean of $53,500 — a factor of 1.284 — so the labor half is scaled by that and the material half is not. Source: BLS OEWS May 2025 for the Seattle-Tacoma-Bellevue, WA metro area, SOC 47-4071.
- Why the city matters, not just the state. Trade pay moves inside a state as much as it does between states. Crews do not commute across a state to bid a job, and materials ship at national prices either way — so a metro wage is the honest input here and a state average quietly rounds four different cities into one number.
- What is in the price: excavation, gravel or chamber media, perforated pipe, the distribution box, backfill, grading and labor.
- What is not: the tank itself, a new perc test, engineered plans, a pump chamber if the site needs one, and county permits. These are the lines that turn a $9,016 quote into a $11,271 invoice, so ask about each one before signing.
- Use this as a bid check, not a quote. It prices an average job in average condition. Difficult access, the state of what is being replaced, the season, and a crew booked out three months all move the real number, and none of them are in a per-unit average.
a septic drain field replacement in Kent, WA
$9,016 is the typical number, and three bids on the same scope normally land between $5,549 and $17,339.
That is $1,216 more than the same job priced at the national average.
Why the city changes the number
About 55% of this job is labor — $4,959 of the $9,016 above. Labor is the only part that moves locally; a bundle of material costs what it costs wherever it is nailed down.
Septic Tank Servicers and Sewer Pipe Cleaners near Kent average $68,670 a year, against a U.S. mean of $53,500. That is a factor of 1.284, so the labor half is scaled by it and the material half is not.
Source: BLS OEWS May 2025 for the Seattle-Tacoma-Bellevue, WA metro area, SOC 47-4071.
What the quote should include
The lines that turn a quote into an invoice
Ask about each of them before you sign. On a job this size they are the difference between $9,016 and something a quarter higher.
Use it as a bid check, not a quote
This prices an average job in average condition. Access, the state of what is being replaced, the season, and a crew booked out three months all move the real number, and none of them are in a national average.
If a bid lands outside $5,549 – $17,339, that is not automatically wrong — but it is the question worth asking out loud.
Nearby sizes
Read more
- Repair or Replace — Working Out What Has Actually FailedThe system is backing up, and four of the five likely causes cost a few hundred dollars.
- What a New Septic System Costs, and What Drives the NumberThe tank is a small part. What the ground demands is the rest.
- What a Septic System Costs to Keep — Annually and Over Its LifeThe cheap system to build is not always the cheap system to own, and the gap is measured in decades.
- Septic Drain Field Cost by State — 1,000 ft², All 51This trade has the tightest state-to-state spread of any on the site — which is itself the useful finding when two local quotes differ by half.