Storage Tank vs Pressure Tank vs Cistern
These get confused. A small pressure tank on a well just buffers the pump so it does not short-cycle - it holds only a few usable gallons. A storage tank is a much larger atmospheric or bladder tank that banks hundreds of gallons, with a booster pump pulling from it to feed the house. A cistern is storage fed by rainwater or a hauled/utility source.
Why It Matters
If your problem is weak flow when several fixtures run, a low-producing well, or wanting water on hand after a storm, a bigger pressure tank will not solve it - you need actual storage plus a booster.
Why Floridians Add Storage
Common Florida reasons: a low-yield well that cannot keep up with irrigation or a busy household, pressure/flow problems on long runs or at the end of a utility line, and hurricane preparedness - a potable reserve when service or power is interrupted.
Why It Works Here
Florida's flat lots, sandy aquifers, and storm season make stored water genuinely useful. A storage tank lets a modest well fill slowly between draws, then a booster delivers strong, steady pressure on demand.
Sizing: How Much Storage You Need
Size follows the goal. A small buffer (under ~120 gal) smooths a slightly weak well; 120-500 gal covers a household flow buffer or a few days of careful reserve; 500-1,500+ gal serves heavy irrigation, larger reserves, or true cistern use.
Plan for It
Bigger tanks need space, a level base, and turnover so water does not sit stagnant. A right-sized tank with good turnover beats an oversized one that stagnates. Match tank, well recovery rate, and booster so they work together.
Florida Well Water: Iron, Sulfur & Treatment
Florida well water frequently carries iron, sulfur (rotten-egg odor), hardness, and sediment. Stored water can also let iron and sulfur settle and stain a tank.
Why Treatment Pairs With Storage
It is common to put sediment, iron, and sulfur treatment ahead of or alongside the tank, and for any potable reserve to add UV disinfection - because stored water sits and can support bacterial growth without it. Tanks for drinking water should be a food-grade / NSF-rated tank. Treatment choice depends on a water test.
Potable vs Non-Potable & Cross-Connection
A tank feeding drinking water has to be potable-rated, kept sealed and screened against contamination, and protected so storage cannot back-feed the public supply. A tank for irrigation only is non-potable and must be clearly separated from the drinking system.
FL Notes
Backflow/cross-connection protection between a private storage or well system and any public supply, and the rules for potable storage and disinfection, are set by the adopted code, the local utility, and (for wells/health) the county health department. Confirm before you build.
Install Steps & Best Timing
Best Time: With a Well or Re-Plumb
Adding storage when a well is drilled or a system is re-plumbed is the cleanest path - the pad, pump, and tie-in get planned in.
Typical Install
- Size the tank to the goal and well/utility supply. 2. Set a level pad or base (strapped for wind). 3. Plumb the fill, the booster pump suction, and the discharge to the house/irrigation. 4. Add treatment (sediment/iron/sulfur) and UV for potable. 5. Wire pump controls and any float/level switches. 6. Disinfect, fill, and test pressure and turnover.
FL Gotchas
Skipping UV on potable storage, an undersized or unstrapped tank, no cross-connection protection, and a booster mismatched to the tank.
Maintenance & Keeping Water Fresh
Stored water needs turnover and a little upkeep, especially in Florida heat.
Routine Care
Check and change sediment/iron filters and the UV lamp on schedule, inspect the tank and screens, confirm the booster holds pressure, and make sure water turns over rather than sitting. Sanitize the tank periodically per your installer's guidance.
Warning Signs
Odor or discoloration, dropping pressure, a short-cycling booster, staining inside the tank, or a UV alarm all mean it is time to service the system.
Costs & What Drives Them in Florida
The tank is one line item - size, the pump and controls, and treatment drive the total. These are planning estimates for the work plus professional labor in the FL market.
Purpose, Size & Scope
A small tank swap is the low end; a large full system with tank, booster, controls, and tie-in is the high end. Bigger tanks and full systems cost more than a buffer.
Treatment & Pad
Iron/sulfur/sediment treatment, UV disinfection for potable water, and a concrete pad with hurricane strapping each add. Use the calculator to combine purpose, size, system scope, and add-ons.
FL Permit Requirements
Usually Minor in FL
- Swapping a like-for-like storage tank into an existing system
- Replacing a sediment/iron filter cartridge or a UV lamp
- A non-potable irrigation tank fed off an existing outdoor supply (verify locally)
Permit / Licensed Work Likely in FL
- A new tank-pump-controls system tied into the home supply
- Anything feeding potable / drinking water (disinfection, cross-connection)
- Backflow / cross-connection protection to a public or well supply
- Well work and any health-department-regulated potable storage
FL County Permit Fee Reference
Swapping a tank or changing a filter/UV lamp is usually minor. A new tank-pump-controls system, potable storage with disinfection, cross-connection protection, or well-related work is regulated and often permitted, and potable systems can involve the county health department. Fees and timelines are approximate — verify with your local building department / AHJ (and health department for wells) before starting work.
| County | Permit Fee | Est. Processing |
|---|---|---|
Who Can Pull a Permit in FL?
Installing a water storage tank with a booster pump, controls, and a tie-in to the home supply is regulated plumbing (and electrical) work that often requires a permit, and anything serving potable / drinking water brings in disinfection and cross-connection rules - and for private wells, the county health department. Potable tank rating, UV/disinfection, backflow/cross-connection protection, pump wiring, and wind strapping follow the adopted code, local utility rules, and local amendments, and new systems are generally permitted and inspected. A like-for-like tank swap or a filter/UV-lamp change is usually minor. Per FL Statute 489.105, regulated plumbing and related construction work is performed by the appropriate licensed contractor.
Verify any contractor's license at myfloridalicense.com and confirm requirements with your local building department before work begins.