How the schedule is built
The estimate starts with your tank size and household size, then uses the Oregon State University Extension table as the reference point. The app can also account for household use patterns, including garbage disposal use, so the schedule is closer to your actual system than a simple calendar reminder.
Want the full method? See the septic pumping calculator or read the guide to pumping frequency.
The risk window
Septic & Well shows a warning before the due date so you have time to act before the schedule becomes urgent. That risk window is meant to help you plan service, organize records, and avoid waiting until the last minute.
Learn more about the product on the features page or join the waitlist.
Baseline inspection
If the last pumping date is unknown, the schedule starts from a baseline inspection and the system builds the estimate from there. That gives you a starting point even when old service records are missing.
You can also track reminders and records on the reminders page.
Reference table (answers: How often should a septic tank be pumped?)
Septic & Well uses the Oregon State University Extension EC 1343 Table 1 as a reference for estimated pumping frequency by tank size and household size. EPA also says a typical household septic tank is generally pumped every 3 to 5 years, depending on household size, wastewater volume, solids, and tank size.
Reference: Oregon State University Extension EC 1343 Table 1 and EPA septic care guidance.
Limits of the estimate
This is still an estimate, not a substitute for local rules or an inspector review. Local conditions, site specific findings, and professional judgment can override the schedule.
If you want the broader septic planning flow, start with the features page or the pumping guide.
This is not an inspection and not advice from a licensed septic professional. Pump-out timing depends on the tank, the household, and local rules. Check with your local health department.