Low Water Pressure in 94947 (Novato, CA)
Low water pressure is inconvenient but not dangerous. However, if it developed suddenly, it could indicate a burst pipe or major leak that needs prompt attention.
Low water pressure is caused by corroded pipes, a failing pressure regulator, a partially closed valve, or municipal supply issues. If pressure is low at one fixture, the aerator or cartridge is likely clogged. If it's house-wide, check the main shutoff valve (make sure it's fully open) and the pressure regulator. Diagnosis costs $100–$200.
Common Causes in 94947
- •Corroded or Clogged Pipes — Galvanized steel pipes (common in pre-1970s homes) corrode internally, reducing flow. Mineral deposits also accumulate in pipes over decades.
- •Failing Pressure Regulator — The pressure regulator (PRV) controls incoming water pressure. When it fails, pressure can drop significantly. Typical lifespan is 10–15 years.
- •Partially Closed Valve — The main shutoff valve or meter valve may not be fully open, especially after a recent repair. Even a quarter-turn can reduce pressure throughout the home.
- •Clogged Aerator or Fixture — If only one faucet has low pressure, the aerator screen or cartridge is likely clogged with mineral deposits. Easy DIY fix.
- •Water Leak — A hidden leak (slab leak, pipe leak) diverts water away from fixtures, reducing pressure. Check your meter with all fixtures off — if it's still moving, you have a leak.
- •Municipal Supply Issue — City water main breaks, maintenance, or high neighborhood demand (summer watering) can temporarily reduce pressure.
When to Call a Pro in Novato
- ✓ Pressure dropped suddenly throughout the home
- ✓ Multiple fixtures have low pressure (not just one faucet)
- ✓ You've checked the main valve and it's fully open
- ✓ Your water bill increased without increased usage (possible hidden leak)
- ✓ You have galvanized pipes and pressure has gradually worsened