The calls that come out of Pomona.
Most Pomona calls start with something already going wrong. A toilet gurgles when the washer drains. Sewage shows up in a shower. A water bill jumps while the meter spins with every tap shut. Someone hears a hiss inside a wall.
Emergency dispatch is available around the clock, and the plumber who comes is licensed. We are based in Claremont, about 5 miles north and northeast of Pomona, so the drive is short even at 2 a.m.
Pomona is the seventh largest city in Los Angeles County, with 151,713 residents in 2020. A city that size mixes old downtown lots with hillside tracts, so problems differ block to block.
Signs you should call tonight, not tomorrow.
- Sewage or gray water backing up in a tub, shower or floor drain.
- Several fixtures draining slowly at the same time.
- A water meter that keeps moving after every faucet is off.
- Hissing, dripping or damp drywall around a supply line.
- A tank water heater pooling water at the base.
- Warm spots or a musty smell on a slab floor.
Why backups and leaks happen here.
Drain trouble usually traces to a few causes. Older clay or cast iron lateral lines crack at joints and let roots in. Grease and wipes build up in kitchen lines. A camera pass shows which one you have before anyone digs.
When a whole-house backup hits, the main line is the likely culprit, and drain cleaning with a cable or jetting head may clear it the same night. If the camera shows a broken or offset pipe, that is a job for sewer line repair, and clearing alone will only buy a few days.
What is in the water, and what it does to pipes.
The City of Pomona Water Resources 2023 Annual Water Quality Report (2022 data) shows a mixed supply. About 73 percent is groundwater from two aquifers, with wells in Pomona and Claremont. About 7 percent is surface water from San Antonio Canyon, filtered at the Frank G. Pedley plant in Claremont. About 20 percent is imported, treated at the Weymouth plant in La Verne and the Miramar plant in Claremont.
The report's hardness values span roughly 82 to 360 mg/L depending on the source. That is a wide gap, so the minerals your fixtures see can change with the blend reaching your street. Scale on aerators, crusty showerheads and a noisy tank are the usual signs. If you see them, ask for a tank flush during any water heater repair visit, and check the anode rod while the tank is open.
Three ZIP codes, three kinds of property.
Pomona carries three ZIP codes, and the work differs between them. The 91766 ZIP also carries the Phillips Ranch alias. Phillips Ranch is a mostly residential hillside area that grew rapidly from the 1980s, so ask a plumber to test the pressure regulator and inspect the water heater before a small drip becomes a ceiling stain.
Downtown is a different story. Pomona Mall, a 1962 Millard Sheets design, and the 1931 Fox Theater sit among older storefronts. A restaurant there needs after-hours help when a grease line backs up, and a landlord needs a plumber who can trace a leak through a shared wall without opening more than necessary.
Burst pipe or backed-up line in Pomona?.
Dispatch answers day and night, weekends and holidays included.
Common Pomona problems and the usual fix.
| Problem. | Likely cause. | Usual fix. |
|---|---|---|
| Whole-house backup. | Rooted or cracked lateral. | Cable or jet, then camera inspection. |
| Meter running, no faucets on. | Slab or yard line leak. | Electronic leak tracing, then spot repair. |
| Rusty or slow hot water. | Sediment and scale in tank. | Flush, anode check, or replacement. |
| Kitchen sink gurgles. | Grease in the branch line. | Cable the branch, then jet if it recurs. |
| Low pressure at every tap. | Failing regulator or old supply line. | Pressure test, regulator swap or repipe. |
Cal Poly, Fairplex and rental turnover.
Cal Poly Pomona lies partly in Pomona. Wherever students share houses, heavy use on one set of drains means so a landlord should schedule a line cleaning between leases instead of waiting for an overnight backup.
Fairplex hosts the L.A. County Fair, so owners of nearby restaurants and rentals should save a plumber's number before the crowds arrive. In the Lincoln Park Historic District, book a camera inspection before any remodel.
What to do before the plumber arrives.
Find the main shutoff.
Look at the street side of the house or garage wall for the main valve and turn it clockwise. If it will not budge, leave it and tell dispatch.
Stop using water.
Do not flush or run the washer, since a sewer backup sends that water straight back out. A bucket under a drip is fine.
Stay clear of electrical.
Keep away from outlets and cords in standing water. Switch off power to that area only if the panel is dry and you can reach it safely.
Clear a path.
Move cars, storage and pets away from the cleanout, water heater or wet wall.
Choosing a plumber and your next step.
You should see a clear price before work starts, and you can verify any plumber's license on the Contractors State License Board site. For a leak you cannot find, start with leak detection, which traces a pipe without tearing out wall or floor first.
Pomona sits between two of our other service towns. If you are comparing options, you can also read about plumbing in La Verne to the northwest or plumbing in Montclair to the east.
Standards and verification in Pomona.
Pomona repairs follow the California Plumbing Code, which is built on the Uniform Plumbing Code (UPC). For permits, ask the City of Pomona's building office, and for any plumber's license use the Contractors State License Board lookup.
Pomona plumbing questions.
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Yes. Dispatch of licensed plumbers is open 24 hours a day, every day, for Pomona homes and businesses. Same-day appointments are offered when available. Call the number on this page and describe what is happening so the right plumber and tools are sent first.
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Yes. We cover 91766, which includes the Phillips Ranch hillside area, along with 91767 and 91768 across the rest of the city, from the downtown mall district out to the neighborhoods near Cal Poly Pomona. If your street sits near a ZIP boundary, dispatch will confirm the address.
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Stop all water use, including toilets and the washer, and keep people and pets out of the affected area. Do not pour chemical drain cleaner into a backed-up line. Call dispatch, and a plumber can then clear the line and decide whether sewer line repair is needed.
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Shut off every faucet and appliance, then watch the meter needle. If it keeps moving, water is escaping somewhere on the property. Warm floor spots, a musty smell or a bill that jumps with no change in use are other clues. A plumber can trace the exact spot without opening more than needed.
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Mineral scale can build inside tanks, especially where hardness runs higher in the city's mixed supply. Sediment shortens heating element life and makes tanks rumble. Flushing the tank and checking the anode rod helps, and a leaking tank may be better replaced than patched.
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Yes. Restaurants, shops and offices can call for after-hours help with grease lines, floor drains, restroom stoppages and leaks. Tell dispatch whether the building is shared so the plumber plans around neighboring units.
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Responsibility depends on where the blockage sits, so ask the city before assuming. A camera inspection shows exactly where the problem is, which settles the question before any repair is quoted.