Onsite wastewater treatment and dispersal in the industry's smallest footprint — meeting the highest treatment standard required by code, with no disinfection accessories. Serving Washington, Oregon, Idaho and Arizona.
Wastewater disperses through coils on contour over a shallow sand bed — meeting the highest treatment standard in code, then returning clean water to the ground. The least soil, the smallest footprint, no disinfection.
Lowridge provides the onsite wastewater industry with the products that protect and conserve our water resources — complete system packages that make installation quick and simple, with easy-to-follow instructions.
Our primary product has daily design flows ranging from 240 gpd to 500,000+ gpd, the industry's smallest footprint, requires the least amount of soil, and is capable of meeting the highest recognized treatment standard required by code — without any disinfection accessories.
Coil-based treatment and dispersal families sized to the governing state loading-rate code. OSCAR-III remains a single-family residential path only, using the same coil-on-contour footprint approach with a lower loading rate per coil.
View manuals ↗Legacy low-flow questions are handled only as retrofit-to-XO2 guidance. Current product selection and sizing should use OSCAR-XO2 and the approved state manuals.
View retrofit materials ↗Lowridge custom-designs systems by integrating every aspect of wastewater treatment — hydraulic, biological, filtration, electrical controls and final dispersal. Depending on your needs and layout, we can be your one-stop shop.
Talk to engineering ↗It is the mission of Lowridge to offer the most efficient products and methods of wastewater treatment — to protect our environment and to ensure the future of our water supply.
“Sustainability begins with economic viability. It ends with no negative environmental impacts. Lowridge products do both.”
Real OSCAR installations across the Northwest — before-and-after proof of how the system blends into a finished property.
“Sustainability begins with economic viability — and ends with no negative environmental impact.”
The mission of Lowridge Onsite TechnologiesChoose your state to see approved products, manuals & drawings, distributors, certified professionals and training.
A preliminary OSCAR sizing tool — every result traced to the approved design manuals and drawn to scale. The Calculator and Ask OSCAR run on the same engine: two AI agents in constant dialogue on a single shared brain, so the number you size here and the answer the assistant gives stay locked to the same source of truth.
Some lots could only be developed because of an OSCAR system.
240 to 500,000+ GPD · the industry's smallest footprintStart with Ask OSCAR — most questions are answered in seconds. A rep only steps in when you're ready, so you skip the phone tag.
Role-aware answers on products, fit, sizing and resources — instantly, no call required.
Start with OSCAR →Jump to your state's manuals, distributors and certified professionals.
Designers & engineers: run a preliminary, to-the-manual sizing in the OSCAR Calculator.
Open calculatorProfessional project support for designers, regulators, distributors and project teams.
Contact form ↗ public Lowridge line 877·476·8823