Septic System Excavation in Pend Oreille County

Digging for a septic system in Pend Oreille County starts with a permit from the Northeast Tri County Health District, not with a machine. The health district certifies installers, the system must be designed by a designer with a state license or by an engineer, and the dig itself is only one step.

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What septic system excavation involves

A septic system has a tank, pipes and a drainfield, and all three are placed in the ground by excavation. The tank needs a hole of the right size and depth, the pipes need trenches at the right slope, and the drainfield needs ground that has been judged suitable. Because wastewater is involved, the work is regulated by the local health district, not just by the contractor and the landowner.

Before any of that, the soil is examined. Under Washington's on-site sewage rules, site and soil evaluation is done by qualified professionals or the health officer, and the design comes from an on-site designer with a state license or a professional engineer (WAC 246-272A-0220 and -0230). The excavation comes after the design is approved and the permit is in hand.

That order is why this page is mostly about who does what. A machine operator can dig the hole, but a person who installs the system has to be certified by the health district. Hauling and placing a tank alone is not counted as installation under NETCHD's regulations.

When people look into this

A house is being built on a lot without sewer service.
An existing septic system has failed and the drainfield or tank is being replaced.
A system is being expanded for added bedrooms.
A permit calls for test pits to examine the soil.
A tank, riser or lid needs to be dug up for access or repair.
A property is being divided and each lot needs a septic plan.

What the work usually looks like

Start with the health district. Contact NETCHD about the permit and which steps come first.
Evaluate the site. A designer with a state license, an engineer or the health officer evaluates the soil.
Design the system. The design is made by an on-site designer with a state license or by a professional engineer.
Get the permit. The permit is issued before installation, repair or modification starts.
Locate utilities. 811 notice comes before digging (details below).
Install with a certified installer. Excavation for the tank and drainfield follows the approved design.
Ask about inspection. Ask the district what it must inspect before anything is covered.

How to prepare

Before work starts, it helps to settle these points:

Contact NETCHD first and ask what it needs before a permit can be issued.
Find a designer who holds a state on-site wastewater license, or a professional engineer, if the district says a design is required.
Find out which installers are certified by the district and check each one's L&I registration.
Know where the well, property lines, slopes and any water are on the lot.
Keep the digging area clear and mark it.
Find out who will call 811 and get the ticket number.
Ask what the price covers: the tank, pipe, rock, the dig, backfill and any inspection fees.
Get the permit number and design in writing before any work starts.

What affects the cost

Excavation is commonly priced by the hour for operator and machine, or as a set price for a defined scope. Septic work is priced in several pieces, and the excavation is only one of them.

Permit and design. Health district fees and the designer or engineer's work are separate from the dig.
System type and size. A larger system or a more complex design adds material and machine time.
Soil and slope. Rock, clay or a slope changes how much digging and fill the system needs.
Tank and materials. The tank, pipe, drain rock and fabric add material cost.
Distance. Long runs from the house to the tank and to the drainfield add trenching.
Access. A hard-to-reach site slows machines.
Winter. Frozen ground can slow work and delay inspection.

Test pits and why they come first

The soil on a lot decides what kind of system will work and how large it must be, so test pits are dug before the design is final. A test pit is a hole dug with a machine deep enough for a professional to read the soil layers. Who reads the soil matters: Washington's rule limits site and soil evaluation to professional engineers, designers with a state license and the health officer, so a machine operator cannot do this step.

If you are paying for test pits, ask who will be there to read them, how many are planned and who will cover the holes afterward. Uncovered holes are a hazard to children, livestock and wildlife, which is why they are normally backfilled soon after the evaluation. Ask the district whether it wants to be present or wants a written record.

Local rules and sources

Health district. In Pend Oreille County, the Northeast Tri County Health District (NETCHD) certifies septic installers, pumpers and operation-and-maintenance providers. A health-officer permit is required before installing, repairing, modifying, hooking up or expanding an on-site sewage system, while minor repairs such as baffles, filters, pumps, risers and control panels do not need one (WAC 246-272A-0200). NETCHD installation permits are valid for 36 months from issuance, and installers must hold a current L&I contractor registration.

Designers. Washington requires on-site septic systems to be designed by an on-site wastewater designer who holds a state license or by a professional engineer (WAC 246-272A-0230), and a site and soil evaluation to be done by an engineer, a designer with a state license or the health officer (WAC 246-272A-0220).

Contractor registration. In Washington, septic installers work under the L&I specialty for sanitation systems and side sewers, which covers installing septic tanks and related excavating (WAC 296-200A-016). Washington contractors are checked on the state Department of Labor & Industries “Verify a Contractor, Tradesperson or Business” page.

Utility locates. In Washington, notice must go to the one-number locator service (dial 811) at least two full business days, and no more than ten full business days, before digging starts (RCW 19.122.030). Whoever is digging is responsible for making sure the notice is made, even if someone else makes the call for them.

Reasons to trust this page

Most rules on this page name their public source, such as a Washington statute or a county office.
Cost factors are explained in plain terms, and this site does not quote prices.
The email address is shown at the top of every page, and the Privacy page says what a quote request collects.

Common questions

Who approves septic work in Pend Oreille County?

The Northeast Tri County Health District certifies septic installers, pumpers and operation-and-maintenance providers and issues permits for installing, repairing, modifying, hooking up or expanding a system. Contact it before any digging. Under WAC 246-272A-0200, minor repairs such as baffles, filters, pumps, risers and control panels do not need a permit.

How long is a NETCHD septic permit valid?

NETCHD says installation permits are valid for 36 months from the date they are issued. Check the dates on your permit, and ask the district what happens if the work cannot be finished in that time. Keep the permit and the approved design with your property records after the system is built.

Who designs a septic system in Washington?

Washington's on-site sewage rules require an on-site wastewater designer who holds a state license, or a professional engineer, to design a system, with a resident owner sometimes allowed to design for their own home at the health officer's discretion. Site and soil evaluation has a similar rule. Ask NETCHD which applies to your lot.

Can any excavation company dig for a septic system?

Not necessarily. Installers must be certified by the health district and hold a current L&I contractor registration, and hauling and placing a tank alone is not counted as installation under NETCHD's regulations. Ask the district for its certified installer list, and check each company on the L&I page.

What should a septic excavation price include?

Ask whether the price covers the tank, pipe, drain rock and fabric, the dig, backfill, hauling and any permit or inspection fees, and whether the design is separate. Excavation is commonly priced by the hour or as a set price for a defined scope. Get the scope in writing so prices can be compared.

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