Should You Drain Your Pool Before a Hurricane or Major Storm?
The storm track shifted overnight, and by morning Pinellas County is sitting squarely inside the cone. You have 48 hours. Between hanging shutters, filling gas cans, and securing patio furniture, you're standing at the edge of a full pool wondering whether to drain it before the storm arrives.
The instinct to drain makes sense — water feels like something you can control. But acting on that instinct is one of the most expensive mistakes a pool owner can make. The steps below explain what to actually do. The section that follows explains why draining can cost you more than the hurricane itself.
What to Do With Your Pool in the 48 Hours Before a Hurricane
These steps assume at least 24 hours before landfall. If the storm is closer, focus on steps 1 through 4.
Lower the water level by 12 to 18 inches- This is not draining — it's reducing the pool's water level enough to absorb heavy rainfall without spilling across the deck and toward your home's foundation. A submersible pump or your filter's backwash line can bring the level down in a couple of hours. Do not go below 18 inches below the skimmer line.
Remove everything that can move- Pull skimmer baskets, ladders, steps, automatic cleaners, pool toys, and any floating equipment out of the pool and store them inside. In a Category 2 or stronger storm, a foam pool noodle can break a window. An aluminum ladder becomes a projectile. Get it all out.
Shock the pool before the storm hits- Heavy rain dilutes pool chemistry fast. Runoff from rooftops, landscaping, and soil carries phosphates, tannins, and organic debris directly into the water. Raise your free chlorine level to the high end of the normal range — 3 to 5 ppm — before the storm arrives. That buffer prevents your pool from going dead the moment the rain starts.
Turn off all pool equipment at the breaker — not just the timer- Shut down the pump, heater, salt system, and pool lighting at the circuit breaker panel before the storm arrives. Flooding and storm surge can bring water into electrical equipment in ways no surge protector handles. You want power cut before equipment gets wet, not after.
Do not cover the pool- A safety cover or vinyl cover in high winds acts like a sail. The anchors and track holding it down are designed for swimmer safety, not hurricane-force lateral loads. A cover that fails mid-storm also traps debris under itself and creates suction problems when water levels fluctuate. Leave the pool open.
Document everything with photographs- Before the first bands arrive, photograph the pool, deck, equipment pad, and water level from multiple angles. If you need to file an insurance claim for storm-related damage, that photo documentation matters more than you'd expect.
Why Draining Destroys Pools: The Hydrostatic Pressure Problem
Florida's soils hold water in a way that most other states don't. In Pinellas County, the water table typically sits just 2 to 4 feet below the surface. After a major storm drops 10 to 20 inches of rain and pushes surge water inland from Tampa Bay or the Gulf, the ground becomes saturated from the surface down.
When that happens, pressure builds from every direction beneath the pool shell. Think of it like pressing an upside-down bowl into a bucket of water — the pressure pushing up from below has nowhere to go. When the pool is full, the weight of the water inside holds the shell down. A typical residential pool holds 15,000 to 20,000 gallons, and water weighs about 8.3 pounds per gallon. That's over 100,000 pounds of ballast keeping your pool in the ground.
Take that water out, and the ballast disappears. Saturated soil can push the shell upward — a phenomenon called hydrostatic uplift, or more plainly, a "pool pop." It happens in a matter of hours. Pools have shifted several inches out of the ground in a single storm event, shearing off plumbing connections, cracking the shell, and buckling the surrounding deck.
Repairing a pool that has popped out of the ground — when repair is even possible — typically runs $15,000 to $30,000, not counting deck, plumbing, and landscaping. A pool that has cracked and separated beyond repair needs to be demolished and rebuilt from scratch.
Most pool shells have hydrostatic relief valves near the main drain — small valves designed to release ground pressure during controlled, gradual drainage. These are not designed for the volume of pressure that builds under a flooded pool during a major storm. Do not rely on them as a reason to drain before a hurricane.
If You Live Near the Coast: Saltwater Intrusion After the Storm
For pool owners within a few miles of the Gulf or Tampa Bay, storm surge introduces a second issue that inland pools don't face: seawater contamination. Surge water carries salt, sediment, bacteria, and debris that overwhelm standard pool chemistry in ways that freshwater runoff alone doesn't.
If your pool takes on significant surge water, the post-storm recovery is different than a simple chemical rebalance. Salt levels in a freshwater pool that has been contaminated by surge can spike well beyond the range of a saltwater pool system — typically hundreds of parts per million above normal rather than the 3,000 to 4,000 ppm of a managed saltwater pool. That level of salt accelerates corrosion on metal fittings, pump components, and pool lighting.
After a storm with significant surge, test your pool's salt content before assuming a standard shock treatment will clear it. Depending on the contamination level, a partial drain and refill — done after the soil has had time to drain and ground pressure has stabilized — may be the more practical path to a clean pool.
What to Check After the Storm Before Turning Anything On
When the storm passes and the power comes back, the temptation is to flip the breaker and get the filter running immediately. Wait. A 30-minute check before powering on can prevent motor damage, electrical hazards, and equipment failures.
| What to Check | What You're Looking For | What to Do |
|---|---|---|
| Pump basket and skimmer | Debris, mud, leaves blocking flow | Clear completely before running pump |
| Equipment pad and wiring | Standing water, flood line marks | Let dry completely; inspect wiring before powering on |
| Pool water level | High from rain or surge | Drain back to normal operating level first |
| Water color and clarity | Green, brown, black, or opaque | Treat water before running filter long-term |
| Returns, skimmer lines, plumbing | Debris or visible cracks | Inspect before pressurizing the system |
| Deck and coping | Gaps, cracks, or separation from pool shell | Look for signs of structural movement before use |
Running a pump with a clogged basket can burn the motor out in minutes. Powering on electrical equipment before the pad and conduit have dried creates a shock hazard. A check before the power goes on costs nothing.
Once equipment is confirmed clear and dry, restore the water level if it ran high from rain, then start chemical recovery: test first, shock with calcium hypochlorite, run the pump continuously for 24 to 48 hours, backwash the filter, and retest before anyone enters the water.
How Long Does Pool Recovery Take After a Hurricane?
A pool that was properly prepared — water lowered, equipment off, chemicals pre-dosed — typically takes 3 to 5 days to restore after a major storm. That timeline assumes no equipment damage and no structural issues.
A pool with heavy contamination — dark green water, muddy debris, significant organic load — can take 7 to 10 days of continuous circulation, treatment, and backwashing to clear. Florida's heat accelerates chlorine burn-off during that process, so expect to add chemicals more frequently than a normal maintenance cycle.
If the water is opaque black, has a sewage odor, or debris entered the plumbing system during the storm, have a licensed pool professional assess the situation before attempting a chemical recovery on your own. Some post-storm conditions require a partial drain and acid wash — a process that can damage a pool shell if done at the wrong time or without proper technique.
Frequently Asked Questions
Yes. Raise your free chlorine level to 3 to 5 ppm before the storm arrives. Heavy rainfall and runoff will dilute the water and introduce organic contaminants, and starting with a higher chlorine buffer means the water isn't completely depleted before the storm passes. You can also raise total alkalinity to 100 to 120 ppm and pH to 7.4 to 7.6 as additional stabilizing buffers.
Lower the water 12 to 18 inches below the normal operating level — roughly to the bottom of the skimmer opening or slightly below. That gives the pool capacity to absorb heavy rain without overflowing across the deck. Do not drain more than that. The water weight is what holds the pool in place when the soil becomes saturated.
No. Shut off all pool equipment at the circuit breaker — not just at the timer or automation panel — before the storm arrives. Debris entering the plumbing while the pump runs can cause immediate motor damage. Flooding or surge water near electrical components while they're energized is a serious shock hazard.
Green water after a hurricane is common and fixable. It means chlorine dropped low enough for algae to establish — a combination of rain dilution and the organic material that storm runoff carries in. Shock the pool with calcium hypochlorite, run the filter continuously, and brush the walls daily to break up algae colonies. Most post-storm green pools clear within 3 to 7 days with consistent treatment.
A pool that has experienced hydrostatic uplift typically shows a visible gap or crack between the pool shell and the surrounding coping or deck. You may notice the pool looks slightly tilted, or that return jets and fittings have shifted. Plumbing below the shell often shears at connection points, causing water loss even after the pool is refilled. If you see these signs, do not fill the pool or run equipment until a licensed pool contractor has assessed the structural condition.
Not until you've tested the chemistry. Post-storm pool water can look clear while still harboring high bacteria counts, depleted sanitizer, and pH outside the safe swimming range. Restore free chlorine to 1 to 3 ppm, pH to 7.2 to 7.6, and total alkalinity to 80 to 120 ppm, then run the filter for at least 24 hours before getting in.
Prepare Before the Storm, Recover Faster After
Pool storm prep is a short list that takes less than two hours to complete. The homeowners who end up with major post-storm damage are almost always the ones who drained the pool dry or ignored it entirely. A pool that enters a hurricane with its water intact, chemistry pre-dosed, and equipment off gives you a clean starting point when the skies clear — and avoids the kind of structuralhttp damage that no amount of post-storm treatment can fix.
Dog Days Pools offers a complete, one-stop solution for professional pool services in Clearwater, Safety Harbor, and surrounding areas, including green pool clean-up, algae treatment, chemical balancing, and post-storm pool restoration. Our experienced team services residential pool systems with a focus on clean water, safe swimming conditions, and long-term performance. Whether you need pre-storm chemical prep or an urgent pool repair after a hurricane, we provide reliable service and responsive care. Schedule your pool service today — call (727) 205-0566.
