High Water Bills? It Might Be a Pool Leak

Top TLDR:

A high water bill in Polk County (Lakeland, Winter Haven, Auburndale, Mulberry, Bartow) is often caused by a pool leak — frequently in the auto-fill supply line, at the equipment pad slab, in pool plumbing under the deck, or at the skimmer joint. Run the meter test to confirm a leak, then the bucket test to isolate the pool. Call a licensed plumber for slab and supply line leaks; a pool specialist for in-pool work.

When the Bill Doesn't Add Up

You opened your water bill and it's noticeably higher than last month. Maybe it's twice what it usually is. Maybe it's been creeping up over a few cycles and now it's clearly outside the normal range. Nothing in your routine has changed. No extra house guests, no new appliances, no irrigation changes you can think of. So where is the water going?

For pool owners across Polk County — Lakeland, Winter Haven, Auburndale, Mulberry, and Bartow — the answer is more often a pool leak than most homeowners assume. Pool leaks are one of the most common drivers of unexplained water bill spikes in Florida, and they're also one of the most overlooked because the leak doesn't always show up at the pool itself. The water can be disappearing into the ground around an underground supply line, into the slab beneath the equipment pad, or through a small structural crack that's been growing slowly for months.

This guide walks through how to diagnose whether a high water bill is being caused by a pool leak, the simple tests you can run in an afternoon, where pool leaks typically hide, and when the right next call is a licensed plumber rather than a pool company. For broader context, see our Pool Owner's Resource Center on leaks in Florida and Florida Pool Ownership: Leak Prevention for New Homeowners.

Step One: Read the Bill Carefully

Before assuming the worst, take an honest look at the bill. Some increases have explanations that aren't leaks.

Seasonal patterns. Polk County water use is higher in summer than winter. Pools evaporate faster, irrigation runs more, and outdoor use generally goes up. Compare the current bill to the same month last year, not to last month.

Rate changes. Polk County water utilities periodically adjust rates. A bill increase that's actually a rate increase rather than usage increase shows up as a per-gallon number change, not as a higher gallon count.

Billing cycle differences. Bills covering 33 days are higher than bills covering 28 days, all else equal. Check the cycle dates.

Use-related explanations. House guests, kids home from school, pool parties, lawn replanting that increased irrigation, new outdoor faucets, washing the car, filling the pool after a major draining — each can produce real increases that aren't leaks.

Meter reading errors. Rare but real. If a bill is dramatically higher than expected with no other explanation, ask the utility to verify the reading.

If none of those explain the increase, the next step is diagnostic.

Step Two: The Meter Test

The meter test is the fastest way to confirm whether you have a leak somewhere on the property — pool or otherwise. It takes about 30 minutes and tells you whether water is moving when no one is using it.

How to run it:

1. Turn off every water-using appliance and fixture in the house — washing machine, dishwasher, ice maker, water softener if applicable.

2. Confirm no one will use water (toilets, sinks, showers) during the test.

3. Locate your water meter. In most Polk County properties, it's at the front of the property near the street, in a meter box.

4. Find the leak indicator. Modern meters have a small triangular dial, gear, or digital indicator that moves when water is flowing through the meter, even at very low rates.

5. Watch the indicator for two to three minutes. With no water being used, it should not move at all.

If the leak indicator moves, water is flowing somewhere it shouldn't be. That's a leak — somewhere on your property, between the meter and any fixture. The next step is identifying where.

Isolating to the pool:

If the meter indicator moves with everything off, you can isolate the pool by closing the auto-fill valve at the pool (or temporarily disconnecting the supply line to the auto-fill device). Wait five minutes, then re-check the indicator. If the indicator stops moving with the pool isolated, the leak is somewhere in the pool side — either in the supply line feeding the pool or downstream of it.

If the indicator keeps moving with the pool isolated, the leak is somewhere else on the property — typically a toilet flapper, irrigation system, or whole-house plumbing.

Step Three: The Bucket Test (When the Meter Doesn't Move But the Pool Looks Off)

The meter test catches leaks where water is actively flowing into the pool from the home's supply (auto-fill running constantly, supply line leak). It doesn't catch leaks where water is flowing out of the pool into the surrounding soil — those leaks don't move the meter because the home's supply isn't pushing more water through.

If your water bill is high but the meter test shows no leak, the next test is the bucket test.

How to run it:

1. Fill a five-gallon bucket about three-quarters full. Place it on the second step of the pool, where the water inside the bucket is at the same level as the pool water outside.

2. Mark both water levels with waterproof tape.

3. Turn off the pool pump and any auto-fill devices.

4. Wait 24 hours, ideally without rain.

5. Check both levels.

If the pool dropped more than the bucket, the difference is a leak. The auto-fill on most pools refills the pool automatically when water drops, which is why a leak inside the pool can show up as a high water bill — the auto-fill is constantly replacing the leaking water from the home's supply.

Run the test again with the pump on. If the pool drops faster with the pump running, the leak is on the pressure side (return lines, jets). If it drops faster with the pump off, the leak is on the suction side (skimmer, suction line). If it drops at the same rate either way, the leak is more likely structural (shell, tile, light, or fittings).

Where Pool Leaks That Drive Up Water Bills Typically Hide

A handful of leak locations are responsible for the majority of pool-driven water bill spikes in Polk County.

Auto-fill supply line. This is the most overlooked. The water line that feeds the pool's auto-fill device runs from the home's plumbing — sometimes underground, sometimes through the slab. A leak anywhere along that line shows up as elevated water bills with the auto-fill running more than usual. The pool itself may not actually be losing water at all; the line bringing water to it is. This is a plumbing problem, not a pool problem, and it requires a licensed plumber to address.

Skimmer-to-pool joint. The most common pool-side leak in Florida. The plastic skimmer body and surrounding concrete shell expand and contract at different rates with temperature swings, and the seal eventually fails. Small leaks at this joint are often missed for months because the water disappears into the soil under the deck.

Pool plumbing lines. PVC lines under decks and patios that develop joint failures, freeze damage, or root intrusion. The leaks aren't visible at the surface, but the water is moving — and the auto-fill is replacing it from the home's supply.

Pool light fixtures. Cord seals or housing seals that fail allow water to migrate up the conduit and out into surrounding soil. The pool slowly loses water; the auto-fill replaces it.

Equipment pad slab leaks. When a pool equipment pad sits on or near the home's slab, supply lines and backflow preventers can develop slab leaks that present as moisture, settling, or efflorescence at the pad. These are not pool leaks; they're whole-house plumbing leaks affecting the pool area. S&S Waterworks specializes in slab leak detection and repair across Polk County.

Backflow preventers. A failed or leaking backflow preventer at the pool tie-in can leak meaningful water before anyone notices. It's a plumbing repair, not a pool repair.

Pool shell cracks below the waterline. Less common than the above but real. A structural crack lets water out of the pool gradually; the auto-fill replaces it.

Estimating How Much a Pool Leak Costs You

Pool leaks rarely produce dramatic single-month bill spikes. They produce gradual, sustained increases that compound over time. A few benchmarks:

• A pinhole-sized leak losing roughly one gallon per hour adds up to about 720 gallons per month — typically a $5–$15 monthly bill increase in Polk County, depending on rate tier.

• A leak losing 100 gallons per day produces about 3,000 gallons per month — typically $20–$60 in extra cost monthly, plus the cost of replacing pool chemistry as fresh water dilutes it.

• A more significant leak losing 500 gallons per day costs $100–$300 monthly in water, plus chemistry costs, plus the gradual structural damage to soil and surrounding hardscape.

The sticker shock isn't always the bill itself; it's what the leak is doing to the property over time. Slab settling, soil erosion under decks, foundation moisture, and structural damage to surrounding features can run into thousands of dollars to remediate after a leak that, caught early, would have cost a few hundred dollars to fix.

When the High Water Bill Isn't the Pool

The meter test is essential because it confirms — or rules out — the pool as the source. Other common causes of unexplained Polk County water bill spikes:

Running toilets. A flapper that doesn't seat properly can leak hundreds of gallons per day silently. Drop a few drops of food coloring into the tank; if color appears in the bowl without flushing, the flapper is leaking.

Irrigation system leaks. A buried sprinkler line that's developed a crack, a stuck valve that's letting water through after the system shuts off, or a head that's damaged and spraying constantly. Often visible as soggy spots in the lawn. Our Outdoor Plumbing Prep guide for Florida's seasons covers irrigation leak diagnosis in detail.

Outdoor faucets. A hose left on, a hose bib that's leaking at the wall, or a hose connection that's dripping continuously.

Slab leaks in the home. Whole-house slab leaks can run undetected for months, showing up only as a high water bill and sometimes a warm spot on the floor. These require professional detection — and they're directly in the wheelhouse of S&S Waterworks' services.

Water softener malfunctions. A water softener stuck in regeneration mode can cycle continuously, dumping water down the drain.

Whole-house supply line leaks. A leak between the meter and the house, in the underground service line, can run thousands of gallons a month with no visible surface sign.

The meter test isolates which category your situation falls into. Use it before assuming the cause.

When to Call a Pool Company vs. a Licensed Plumber

This is the question that confuses most homeowners. The right call depends on what your tests have shown.

Call a pool leak detection specialist if: the bucket test shows the pool is losing water beyond evaporation; you suspect a structural crack, skimmer joint failure, or pool light leak; you need pressure testing of pool plumbing lines; or the pool company has access tools you don't (underwater dye testing, listening equipment, pool light replacement parts).

Call a licensed plumber if: the meter test shows water flowing with everything off; you suspect a slab leak at the equipment pad; you suspect a leak in the auto-fill supply line; you've got moisture, efflorescence, or settling at the equipment pad; you suspect a backflow preventer failure; or the pool company has cleared the pool but the bill is still high.

The most common misdirection: water bills spike, the pool seems to be losing water, the pool company runs leak detection and clears the pool, but the bill doesn't drop. The leak is in the home's plumbing — usually at the supply line feeding the auto-fill, or at the slab where the equipment pad sits. That's licensed plumbing work, and it's a regular part of what we handle at S&S Waterworks.

For broader context on the boundaries between DIY work, pool specialists, and licensed plumbers, the framework in our DIY Sewer Maintenance: What's Safe vs. What Requires Professionals guide applies the same way to pool-related plumbing.

Why Acting Quickly Matters in Polk County

Pool leaks tend to compound. The longer they go, the more expensive they get — both directly through ongoing water bills and chemistry costs, and indirectly through soil saturation, settlement, and structural damage. Polk County's specific conditions accelerate that compounding.

Sandy, shifting soil. Water leaking into Polk County's sandy soil migrates more freely than it would in clay-heavy soil. Long-term leaks can produce real settlement under decks, equipment pads, and pool surrounds.

High water table. When groundwater is close to the surface, leaking pool water doesn't always produce visible wet spots — it disappears into already-saturated soil. The lack of visible signs means leaks go undetected longer.

Sinkhole region. Polk County is in Florida's sinkhole-prone region. Long-term water introduction into the ground around foundations and structures can contribute to subsurface erosion that leads to settlement.

Hard water and chemistry costs. Replacement water from Polk County's hard water supply requires chemistry adjustments that compound the cost of leak-related water loss.

For most Polk County pool owners, the difference between a leak caught at month one and a leak caught at month six is usually 10–20× in total cost.

Working With S&S Waterworks

S&S Waterworks is a licensed Florida plumbing company headquartered in Polk City, FL, serving Lakeland, Winter Haven, Auburndale, Mulberry, and Bartow. We handle the plumbing-side diagnosis and repair of pool-related water bill issues — slab leaks at equipment pads, supply line failures, gas heater piping, backflow preventer service, and the broader plumbing systems that tie pools into the home's water supply.

If you've run the meter test and confirmed water is flowing with everything off, or if your bucket test shows a leak you can't trace, call S&S Waterworks at (863) 362-1119 or use our contact page for an estimate. For online scheduling, see our appointments page. For more about our team and approach, see About S&S Waterworks. For broader context on Polk County plumbing, the Complete Plumbing Solutions Guide for Polk County Homeowners covers the full scope of services.

The Bottom Line

A high water bill in Polk County is more often a leak than anything else, and pool leaks are one of the most common — and most overlooked — sources. Run the meter test to confirm a leak exists. Run the bucket test to confirm whether the pool is the source. Use the test results to direct the right call: a pool specialist for in-pool work, a licensed plumber for supply lines, slab leaks, and gas piping. Act quickly. Pool leaks compound, and Polk County's soil, water table, and climate accelerate that compounding faster than most homeowners realize.

Catch it early. The cost difference is real.

Bottom TLDR:

If a high water bill in Polk County turns out to be a pool leak, the cost compounds quickly — sandy soil, high water tables, and Florida heat all accelerate damage. Run the meter test (with all water off, the leak indicator should not move), then the bucket test, to isolate the source. For Lakeland, Winter Haven, Auburndale, Mulberry, and Bartow, reach S&S Waterworks at (863) 362-1119.