1. Seven warning signs your septic system is failing
Catching septic problems early can save you thousands. Watch for these red flags:
- Sewage backing up into sinks, tubs, or toilets
- Standing water or soggy ground over the drain field
- Foul odors in the yard or near the tank
- Slow drains throughout the house
- Bright green, spongy grass above the septic area
- Gurgling sounds in the plumbing
- A system that's 25+ years old or repeatedly needs repair
2. What septic replacement really costs in South Florida
Most residential septic tank replacements in Miami-Dade and Broward range from about $6,500 to $18,000. The final price depends on:
- Tank size (driven by the number of bedrooms in your home)
- Soil conditions and water table — coastal lots often need engineered systems
- Whether the drain field also needs replacement
- Permitting and engineering requirements
- Access and excavation complexity on your lot
The best way to get an accurate number is a free on-site inspection — or try our online cost estimator for an instant range.
3. How permitting & soil testing works
Florida requires every septic replacement to be permitted and inspected. The process involves a soil percolation test to measure how quickly your soil absorbs water, which determines the size and type of drain field you need. Your contractor then submits engineered plans to the county for approval before any work begins.
A good contractor handles all of this in-house — soil testing, engineering, permitting, and final inspection — so you never have to navigate county paperwork yourself.
4. Conventional vs. aerobic vs. mound systems
Not every property can use a standard system. In areas with high water tables (common near the coast) or poor soil, you may need an aerobic treatment unit or an elevated mound system. Choosing the right system upfront prevents premature failure and costly do-overs.
5. Five questions to ask before hiring any contractor
- Are you a licensed Florida plumbing contractor? (Ask for the license number.)
- Do you handle permitting and soil testing in-house?
- Is your quote all-inclusive, or will excavation cost extra?
- What warranty do you offer on the tank and workmanship?
- Can you provide local references in my county?
Ready for a free, no-obligation quote?
Kool Plumbing handles your entire septic replacement — testing, permits, and installation — across Miami-Dade & Broward.