Two Failed Laterals and an Unlocatable Propane Line: A Full LPD System Replacement in Camano, WA

System: New 1,000-gallon two-compartment concrete septic tank, Orenco high-head effluent pump in a dedicated vault, and a Low Pressure Distribution drainfield in the front lawn reserve bed, replacing a gravity system over 20 years old with three lateral lines feeding infiltrator domes
Crew: Denis, Alex, Pavel, Slavic, Garett, and Fernando, with a licensed septic designer supporting the system design and permitting process
Total: $21,031 gross before adjustments, $19,831 final for design, permitting, and installation, excluding diagnostic and interim pumping service calls.

"Recently had our 20-plus-year-old septic pumped and inspected by another company. They found water standing in the hole containing the distributor box. Further inspection indicated blocked distributor pipes (3) about 1/4 down the drain field. They scoped the pipes and attempted to power flush them but only got about 1/2 down the length of the drain field. They said the system beyond that point has failed. They said not an emergency but strongly recommended immediate planning for a new drain field. We want to get a second opinion," Greg wrote when he first contacted Septic Solutions in February 2026.
His system was a conventional gravity setup, over 20 years old, running three lateral lines out to infiltrator domes. A previous contractor had already scoped and power-flushed the lines, gotten about halfway down the field, and walked away, calling the rest of it failed. Greg wanted a second set of eyes before committing to a full drainfield replacement, so our technician Toon went out to scope the system independently.

A gravity septic system only works if the pipe grade stays consistent all the way from the tank to the drainfield. Effluent has to keep moving downhill on its own, with no pump to push it along. Over two decades, soil under a pipe run can compact unevenly or shift, and once a section of pipe settles out of level, it stops draining downhill and starts holding water instead. That's a reverse slope, and it turns a working lateral line into a place where solids collect instead of a channel that moves effluent through.

Once enough of a lateral settles that way, no amount of power flushing fixes it, because the pipe itself is holding water at the wrong angle. The fix at that point is re-engineering how the effluent gets distributed in the first place.

When Toon opened the distribution box, it was flooded all the way up to the top of the riser. Running just 50 gallons of test water sent the level rising fast enough that testing had to stop before it overflowed. Camera scoping down the lateral lines showed two of the three runs completely clogged with standing water and heavy black sludge, and only the line on the far end of the field was accepting water at all. The tight line and the two failed laterals had settled into a reverse slope, confirming that the problem went beyond the blockage identified by the previous contractor and that a simple patch repair wasn't going to solve it.

A licensed septic designer came out in May 2026 to register the property with Island County and engineer a new Low Pressure Distribution layout using the front lawn as a reserve bed. Between the initial scoping in February and the installation in August, our crew ran three separate capacity pump-outs, including 1,100 gallons in March alone, just to keep Greg's toilets flushing while the design and permitting moved through the county.

Two site conditions complicated the actual installation. Greg had suffered a stroke midway through the permitting phase and could no longer disassemble a wooden deck sitting directly in the equipment access path. The delay wasn't worth it, so the crew dismantled the deck and hauled it away at no charge instead. The property also had a private plastic propane line installed in 1997 with no tracer wire, which meant it couldn't be found with a standard electronic locator. A specialized third-party locating service would have cost Greg extra, so the crew coordinated with him to shut off the gas ahead of his morning medical appointments and hand-dug the excavation path themselves to expose the line safely before the excavator went in.

The Island County Health Department reviewed the existing tank and recommended replacing it outright instead of adding risers, largely because of its age and an outlet baffle that needed upgrading to keep solids from escaping into the drainfield. Retrofitting a 20-plus-year-old tank to meet current code would have meant working around an aging structure that was already showing its limits, so the crew installed a new 1,000-gallon dual-compartment tank instead of patching the old one.

On the drainfield side, a standard gravity repair wasn't going to hold up on soil that had already proven it couldn't keep a level grade for two decades. The Orenco high-head effluent pump in the new system doses effluent under pressure across the entire reserve bed instead of letting gravity trickle it unevenly into whichever pipe happens to still be level. For this property, the designer recommended an LPD system so the new drainfield would receive metered, pressurized doses instead of relying on the failed gravity layout.

The new tank, pump vault, and LPD drainfield passed final inspection from the Island County Health Department after installation wrapped up on August 26, 2026. The system now runs under a one-year Septic Solutions workmanship warranty on the installation. The Orenco pump and control components are also covered by applicable manufacturer warranties. Greg said the crew handled the heavy lifting so he didn't have to worry about the logistics during his recovery.

A gravity system's entire performance depends on pipe grade holding steady for decades, and on marginal or compacted soil, that grade doesn't always hold. In Greg's case, the camera inspection showed that the problem went beyond a simple blockage. Two laterals and the tight line were holding water because the piping had settled into a reverse slope.

This job also shows why a county health department will sometimes push for a full tank replacement instead of a simpler riser retrofit. Age and baffle condition are as important as whether the tank still holds liquid, and a system serving a shared community well raises the stakes on getting that judgment right the first time.

Technical review: Art Nikolin, Operations Manager, Septic Solutions LLC

If a previous contractor tells you your drainfield failed partway through a power flush, that diagnosis is worth taking seriously; a second opinion should confirm it with a camera and a distribution box inspection instead of repeating the same test. Septic Solutions LLC provides full system design, permitting, and installation across King, Snohomish, Skagit, Island, and Whatcom counties. Request a second opinion at septicsolutionsllc.com.