Shower Temperature Fluctuates? Why Your Water Goes Hot and Cold (South Florida Guide)

If your water pressure suddenly dropped throughout your home, that’s not normal , and it’s rarely caused by the city supply alone. Sudden pressure loss usually means something in your plumbing system has failed or is actively failing right now . In South Florida, pressure drops are often tied to hidden leaks, aging pipes, valve failures, or slab leaks that escalate quickly if ignored. Let’s break down the most likely causes, from most urgent to least. 1. Hidden Pipe Leak (Most Serious Cause) A sudden drop in pressure is one of the earliest signs of a hidden pipe leak. When water escapes from a pipe: less water reaches fixtures pressure drops instantly water may be leaking inside walls or under the slab If pressure dropped overnight or suddenly mid-day, a leak is very likely. 2. Slab Leak Under the Foundation Slab leaks cause pressure drops because water is escaping before it reaches the house. Common slab leak indicators: sudden pressure loss warm spots on flooring sound of running water when off rising water bill Slab leaks are extremely common in South Florida homes with older copper piping. 3. Failing Pressure Reducing Valve (PRV) Many homes have a PRV that regulates incoming water pressure. When a PRV fails: pressure can suddenly drop flow becomes inconsistent fixtures may sputter PRVs wear out over time and often fail without warning. 4. Main Shutoff Valve Partially Closed or Failing The main water shutoff valve can: corrode internally partially close restrict flow suddenly This is especially common with older gate-style valves found in many Florida homes. 5. Pipe Corrosion or Internal Collapse Older pipes (especially galvanized or cast iron) can corrode internally. When corrosion flakes off: pipe diameter narrows flow drops suddenly debris blocks water movement This can affect the entire home or specific sections. 6. Water Heater or Hot-Water-Side Pressure Drop If pressure dropped mainly on the hot water side, the issue may be: sediment clogging the water heater failing dip tube internal heater restriction Testing hot vs cold pressure helps narrow the cause. 7. City Supply Issues (Least Common, But Possible) Municipal issues do happen, but they’re far less common than homeowners assume. If: neighbors have normal pressure the issue persists for hours no notice was given …the problem is likely inside your home. 8. DIY Checks You Can Do Immediately ✔ test multiple fixtures ✔ check hot vs cold pressure ✔ inspect the main shutoff valve ✔ listen for water sounds when off ✔ check the water meter for movement If the meter moves when everything is off → you have a leak. 9. Why Sudden Pressure Drops Shouldn’t Be Ignored Ignoring pressure loss can lead to: worsening leaks wall or slab damage mold growth pipe bursts emergency repairs Pressure loss is often the first warning, not the last. 10. When to Call a Plumber Immediately Call a professional if: pressure dropped suddenly pressure is low everywhere you hear water when off water bill rises damp spots appear warm floors are present These signs point to active system failure. 11. What We Do (Professional Diagnosis) At Leading Plumbing Services , we: test system pressure inspect shutoff valves and PRVs locate hidden leaks perform leak detection inspect slab and wall piping isolate and repair the issue restore proper pressure safely We don’t guess , we diagnose. 12. South Florida Homeowner Reality In South Florida, a sudden water pressure drop is often tied to: aging plumbing mineral corrosion slab construction high water pressure stress shifting sandy soil Waiting usually makes the repair more expensive. Final Thoughts If your water pressure suddenly dropped , your plumbing system is telling you something has changed , and it needs attention. Catching the cause early can prevent: major water damage foundation issues mold remediation emergency pipe failures Call/Text us today for immediate water pressure and leak diagnostics: (561) 506-6159