If a pipe breaks or a drain overflows in a San Marcos home, close the main valve first; if you smell gas, get out and call 911 and SDG&E at 1-800-611-7343 from a safe distance. Then call the number on this page to be connected with a local plumber in San Marcos.

San Marcos basics
Vallecitos Water District provides both water and sewer in San Marcos and maintains the mains. Lines installed to serve a private property are the owner's responsibility, so anything from the meter or the sewer main connection to the house is plumber territory. Vallecitos disinfects with chloramines, and part of its supply is desalinated seawater from the Carlsbad plant. The housing here is fairly young, with a median build year of 1994, so many emergencies involve water heaters, supply hoses, valves and fixtures rather than decades-old pipe.
Steps to take right now
- Close the house shutoff and open a low faucet to relieve pressure.
- For a leaking water heater, turn off the gas or breaker and close the cold supply.
- If drains are backing up, stop using water everywhere in the house.
- If you smell gas, leave first, then call 911 and SDG&E at 1-800-611-7343 from outside.
- If water is coming from the street or meter box, call Vallecitos at 760-744-0460.
- Photograph the damage, then call a plumber.
What you see and what it often means
| Symptom | Common cause |
|---|---|
| A supply hose or fitting that bursts with no warning | Wear, or water pressure above what the home's plumbing should see |
| Banging pipes and a relief valve dripping at the water heater | High pressure or a failing pressure regulator |
| Sewage in a shower or tub | A blockage in the private line to the Vallecitos main |
| Water heater standing in a puddle | A failed tank or fitting |
| A meter that keeps spinning with all fixtures off | A hidden leak in a wall, slab or yard line |
Pressure deserves a note. Vallecitos installs a regulator on its side of the meter where pressure exceeds 175 psi, but the district says that regulator protects the meter, not your line, so some homes need a customer-side regulator at the owner's expense.
Cost factors
- The hour and day of the call; after-hours work usually costs more.
- Whether the leak is exposed or hidden behind finishes.
- Whether a pressure regulator, expansion tank or water heater has to be replaced.
- Permits through the City of San Marcos Building Division, (760) 744-1050. Its residential permit packet includes a water-conserving fixture certificate: homes built on or before January 1, 1994 must replace non-compliant toilets, showerheads and faucets as part of permitted work.
Emergency Plumber questions in San Marcos
Water is gushing from the street or the meter box. Who do I call?
Every tap in the house went dry at once. Is that my plumbing or the water provider?
Water is pooling under the water heater. Is that an emergency?
What information should I have ready when I call?
More plumbing services in San Marcos
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