Size it yourself, or just ask. Both run on the same verified engine, locked to Lowridge's approved design manuals — so the number you get is the number you submit.
Size any OSCAR system to scale in seconds — coils, zones, basal area, sand, and a drawing, every number traced straight to the approved design manuals. The same engine designers submit with and regulators check against.
Open the Calculator →
Your on-call OSCAR expert. Ask anything in plain English — products, sizing, code, install — and get a straight answer from Lowridge's own manuals, with the sources cited. Answers in seconds, any time.
Ask OSCAR →One shared engine — the number you size and the answer you get stay locked to the same source of truth.
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 100,000 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 ↗Single-family residential design flow can exceed 480 gpd and may go up to 1,500 gpd when supported by the residential design path. Multifamily is commercial and should use XO2-15/XO2-35 kit tables, headworks, piping and multi-zone drawings from the approved XO2 design manuals.
View source library ↗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 ↗
Every OSCAR-XO2 kit includes a pre-assembled headworks box — flow meter, disc filter, pressure gauges, and solenoid zone valves, all plumbed and tested before it leaves Lowridge. No field assembly and no guesswork.
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 TechnologiesTap your state for approved products, manuals & drawings, distributors and certified professionals.
Choose your state to see approved products, manuals & drawings, distributors, certified professionals and training.
Some lots could only be developed because of an OSCAR system.
240 to 100,000 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
The same role-aware OSCAR guidance, source-library lookup, sizing support, products, manuals and resources — packaged as a polished iPhone app, now available on the App Store.
ASK OSCARLive now · answers in seconds
