A water bill that jumps with no puddle, stain or drip to explain it is one of the most common leak calls in South Florida. The water is going somewhere, and the meter records it even when the house shows nothing. Most of the time the loss comes from one of a handful of predictable places. Each one leaves a different clue on the bill, on the meter or around the property.
The scale is bigger than most homeowners expect. According to the EPA’s WaterSense program, household leaks waste close to 10,000 gallons a year in an average home. About one home in ten has leaks running 90 gallons or more every day. That second group produces the shocking bills, and those leaks are rarely visible.
The quickest way to narrow the search is the meter. Shut off every fixture. Make sure the irrigation controller, ice maker and pool autofill are idle. Then lift the meter lid and watch the small low-flow indicator, usually a red triangle or star. If it moves, water is passing through the meter. If it stays still for an hour or two, the higher bill more likely comes from usage or a billing error. Leaks on the house side of the meter are the owner’s responsibility, so it pays to sort them by source before anyone opens a wall or a floor.
When the dial keeps turning and nothing in the house explains it, Leak Pros & More is a Boca Raton leak specialist with more than 20 years of residential work across Palm Beach County and northern Broward. Their technicians use acoustic listening gear, FLIR thermal imaging and moisture meters to trace a leak without tearing up tile. When the trouble is on the drain side, they use sewer cameras and smoke tests instead. They also take emergency calls 24 hours a day. If the meter is spinning and the floors are dry, a detection visit usually costs far less than another month of unexplained usage.
Toilets That Refill on Their Own
Toilets are the most common source. They also tend to make no noise at all. A warped flapper lets water seep from the tank into the bowl. A fill valve set too high spills water down the overflow tube without any sound. Guest bathrooms are frequent culprits because the flapper dries out and loses its seal between uses. One sign is the tank refilling briefly in the middle of the night when nobody has flushed.
The test is simple. Put a few drops of food coloring in the tank, wait about ten minutes without flushing, and look for color in the bowl. A new flapper costs a few dollars. Lowering the float adjustment fixes most overflow-tube leaks.
Irrigation Zones and Buried Sprinkler Lines
Lawn irrigation is the largest single household water use in the region. The South Florida Water Management District limits landscape watering to two or three days a week, depending on the county and city. Watering more often than that may already be a clue. Controllers often reset to a factory schedule after a power outage, so a system that ran on schedule in spring can run daily by late summer.
Physical leaks are harder to spot. Mowers crack sprinkler heads. Roots split lateral lines. A valve diaphragm with debris stuck in it can let one zone weep around the clock. WaterSense estimates that an irrigation leak about the thickness of a dime can waste roughly 6,300 gallons a month. Look for a strip of grass that stays greener than the rest, soft ground or mushrooms after dry weather. The EPA’s sprinkler checkup guidance walks through inspecting each zone one at a time.
Pinholes in Lines Under the Slab
Most homes in Palm Beach and Broward sit on concrete slabs. Many built before the 2000s have copper supply lines running beneath or through that slab. Over the years, water chemistry, rubbing against concrete and rebar, and the constant expansion of hot lines can wear pinholes into the copper. Sandy soil under the slab absorbs the water, so nothing pools.
A leak on the hot side is easier to catch. You may find a warm patch of tile, a water heater that seems to run all the time, or a hissing sound near a wall at night. A leak on the cold side often shows only on the bill. Technicians usually shut off the water heater supply to see whether the meter stops. Then they narrow the location with acoustic sensors and thermal cameras. Repair options include opening the floor at the exact spot, rerouting that line overhead through the attic, or repiping the house with PEX. Repiping is often the better choice when one pinhole suggests others are forming.
The Line Between the Meter and the House
The service line runs underground from the meter to the home’s main shutoff. It is easy to forget because it is never seen. There is one test that isolates it. Close the main shutoff at the house, then check the meter again. If the indicator still moves, the leak is in that buried run. Homes from the late 1970s to the mid-1990s may still have gray polybutylene pipe in this section. That pipe tends to become brittle and split with age. Once again, sandy ground absorbs the water, so a service line can leak for months without leaving a soft spot.
Pools and Autofill Valves
In homes where the pool autofill draws from the house supply, a pool leak shows up on the water bill. A float that sticks open keeps adding water no matter what. Cracked return lines, skimmer throats and light niches all lose water that the autofill then replaces. The bucket test separates leaking from evaporation. Set a filled bucket on a pool step, mark the water level inside the bucket and the pool level outside it, and compare after a day with the autofill turned off. If the pool drops noticeably more than the bucket, the pool is leaking.
Small Lines Behind Appliances
A few minor sources drain into places nobody checks. A water heater’s temperature and pressure relief valve may discharge through a pipe to the outdoors. A water softener stuck in its regeneration cycle can send water down the drain for hours. Refrigerator ice maker lines and washing machine supply hoses can drip behind cabinets and into wall cavities. Most of these are easy to check with a flashlight and a dry paper towel.
What the Pattern on the Bill Suggests
How the bill rises is also a clue. A sudden jump from one cycle to the next usually points to a stuck valve, a broken sprinkler head or a toilet that started running. A slow climb over several months fits a widening slab pinhole or a deteriorating service line. Keeping a year of bills makes that comparison easy.
Problems on the drain side are a separate category. A cracked sewer pipe or a failing drain line will not show on the meter. Instead it shows up as odors, slow drains or gurgling. Camera inspections and smoke tests are used to locate those problems, so the right diagnostic tool depends on whether the symptom is high usage on the bill or a problem with water leaving the house.