System Selector
A friendly guide to gravity, aerobic, and mound systems for Ocala area homes.
Choosing a Septic System for Your Ocala Lot
July 1, 2026

Buying a lot or replacing a failed system in Ocala usually comes down to one question: which type of septic system will your soil actually pass? There are three common answers, and the right one depends on how fast your ground drains and how high the water table climbs in the wet season. Here is how to think it through before you call for a quote.
Start With the Perc Test
Everything begins with a percolation test. It measures how fast water moves through your soil and confirms the seasonal high water table over the Floridan aquifer. Marion County requires the result before it will permit any system, and it is the number that decides which of the three types below your parcel can support. Do not skip it, and do not trust a guess based on the neighbor’s lot.
Gravity Systems for Well Drained Ground
If your soil drains well and the water table sits low, a conventional gravity system is the simplest and most economical choice. Wastewater flows from the tank to a distribution box and out into a gravel or chamber drainfield with no pumps to maintain. Most of the flat, sandy lots around Ocala take a gravity system without trouble. This is the standard for a new septic system installation when the ground cooperates.
Aerobic and Mound Systems for Hard Sites
Tight clay, a small lot, or a high seasonal water table changes the math. An aerobic treatment unit certified to NSF/ANSI Standard 40 feeds oxygen to the effluent and cleans it before it reaches the ground. Where the soil is too shallow, an engineered mound builds an elevated bed that creates the four feet of separation the county requires. Both cost more than gravity, but they let you build on a lot that would otherwise fail. Our page on aerobic and mound systems explains when each one fits.
Size the Tank to the House
Whatever type you choose, the tank is sized by bedroom count. A three bedroom home usually takes a 1,000 to 1,250 gallon tank, and a four bedroom home steps up to 1,500 gallons. Undersize it and you shorten the life of the whole system, so this is not the place to cut corners.
Plan for Florida Rain
Ocala summers bring afternoon storms that raise the water table quickly. A system designed for a dry January reading will surface the first wet season, which is why we test the seasonal high mark and size the drainfield for wet season flow. Getting that right the first time is far cheaper than a repair two rainy seasons later.
Not sure which system your lot needs? Call Vicunachocolate at (352) 250-9169 or contact us for a free site evaluation and a firm written quote.
