Your Septic Install Timeline, Week by Week

Published July 1, 2026

Planning a new septic system feels vague until you can see the calendar. Most Ocala homeowners are surprised that the digging is the fast part and the paperwork is what sets the pace. Here is how a typical conventional install unfolds in Marion County, stage by stage, so you know what happens and roughly when.

Week One: Perc Test and Site Evaluation

Everything starts in the dirt. A soil percolation test measures how fast water drains and confirms the seasonal high water table on your lot. Sandy Ocala soils can pass quickly, but a wet parcel may point toward an aerobic or mound system instead. This step decides the drainfield size and the whole system design, so it is worth doing carefully rather than fast.

Week Two: Permit Review

With the perc results in hand, we submit the design to the Marion County health department. Permit review is the stage most likely to stretch the timeline, since it runs on the county’s schedule, not ours. We handle the application and answer any questions the reviewer raises. A clean, complete submittal is the best way to keep this window short.

Week Three: Excavation and Tank Set

Once the permit clears, the visible work moves fast. We excavate for the tank and drainfield, set a watertight concrete or polyethylene tank, and install the distribution box that splits flow evenly across the laterals. If you are replacing an old system rather than building new, see our septic tank replacement page for how the old unit comes out first.

Week Three: Drainfield and Inspection

The drainfield installation goes in right after the tank, with gravel trenches or gravelless chambers sized to the perc rate. Before anything gets covered, the county inspector checks the tank, the D-box, and the field against the approved plan. We never backfill ahead of that sign off, because a buried system that fails inspection has to be dug back up.

Week Three or Four: Backfill and Final Grade

After the inspection passes, we backfill, grade the surface to shed water away from the field, and file the as built record. From permit to final grade, a straightforward three bedroom job often lands inside two to three weeks. Advanced systems take longer because of the extra inspections and equipment.

Thinking about a new system and want a real schedule for your lot? Contact us or call Milestonescalendar at (352) 491-0460 for a free site evaluation in Ocala.