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How much does a septic drain field cost in Tri-Cities, WA?

A septic drain field replacement in Tri-Cities, WA
$21,982
1,500 ft² of drain field · typical range $13,527 – $42,273
Typical total$14.65 per ft² of drain field$21,982
Range you should see in bidsthree bids on the same scope normally land inside this$13,527 – $42,273
Labor portion55% of the job — this is the part that moves by city$12,090
Material portion45% — bought at national prices$9,892
Septic Tank Servicers and Sewer Pipe Cleaners pay near Tri-CitiesBLS does not publish a metro figure for septic tank servicers and sewer pipe cleaners near Tri-Cities, WA, so this is the Washington state average, SOC 47-4071$65,880/yr
U.S. mean for the same tradeSOC 47-4071$53,500/yr
Versus the national pricetrade pay here runs +23.1% against the U.S. mean+$2,482

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 Tri-Cities, WA average $65,880 a year against a U.S. mean of $53,500 — a factor of 1.231 — so the labor half is scaled by that and the material half is not. Source: BLS does not publish a metro figure for septic tank servicers and sewer pipe cleaners near Tri-Cities, WA, so this is the Washington state average, SOC 47-4071.
  • This one falls back to a wider average. BLS did not publish a metro-level wage for this trade near Tri-Cities, WA, so the figure above is a state average. It is still the right order of magnitude, but a local bid carries more weight here than it would in a large metro where the survey has more responses.
  • 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 $21,982 quote into a $27,477 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 Tri-Cities, WA

$21,982 is the typical number, and three bids on the same scope normally land between $13,527 and $42,273.

That is $2,482 more than the same job priced at the national average.

Why the city changes the number

About 55% of this job is labor — $12,090 of the $21,982 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 Tri-Cities average $65,880 a year, against a U.S. mean of $53,500. That is a factor of 1.231, so the labor half is scaled by it and the material half is not.

Source: BLS does not publish a metro figure for septic tank servicers and sewer pipe cleaners near Tri-Cities, WA, so this is the Washington state average, 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 $21,982 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 $13,527 – $42,273, that is not automatically wrong — but it is the question worth asking out loud.

Nearby sizes

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