Plumber in Pomona, CA: Which Jobs Need a Permit and Who Runs the Sewer

What the City of Pomona says needs a plumbing permit

The City of Pomona's plumbing permit sheet, issued by its Building and Safety Division, lists any new, replacement, relocated or altered water heater as work that needs a permit. It also says replacing defective pipe is treated as new work, with a permit and an inspection.

That is clearer than most cities. A tank swap and a pipe replacement are both permit jobs in Pomona. Ask the plumber who files, and ask for the permit number afterward.

• Water heater replaced or moved: permit.
• Defective pipe replaced: permit and inspection.
• Ask the plumber to put the permit on the quote.

Our water heater quote checklist shows what else should appear on that quote.

Pomona permit counter hours and the Friday closure

Pomona's Building and Safety pages say the front counter is open Monday to Thursday, and that City Hall is closed on Fridays. They also list inspections as Monday to Thursday, with two different sets of hours on different pages. We did not find a published phone number for building permits.

So a permit question on Friday waits until Monday. If a tank fails on a weekend, a plumber can still replace it, but the permit and inspection follow on a weekday. Ask how the installer handles that gap.

Water and sewer both come from the city

The City of Pomona's Water Resources Department supplies the water, and its Wastewater Division operates the sanitary sewer system. The city's 2023 water quality report says groundwater from two aquifers makes up about 73 percent of supply. The hardness table in that report does not map cleanly to a single source, so this page does not quote a figure.

For grease in kitchen lines, the city's Water and Wastewater Operations Division can be reached at (909) 620-2251, and its guidance is never to pour fats, oils or grease down a drain. That fits with what we say about disposal jams and grease.

We did not find a city page saying who owns the sewer lateral in Pomona. Los Angeles County Public Works says laterals within its own system belong to the property owner, but Pomona runs its own sewer system, so do not assume the same rule applies. Ask the Wastewater Division, and see our sewer repair order of operations for the camera step.

Leaks that keep coming back

We did not find a source for the pipe materials used in Pomona homes, so we do not name one. What we can say is what to do when leaks keep returning in any house: stop patching and ask the plumber to show you the pipe, name the material and say what the rest of the line is likely to be.

1. Ask the plumber to photograph every failed section.
2. Ask what the pipe is made of and how old it appears.
3. Ask whether the repair is isolated or the line is near the end of its life.

That conversation leads to aging supply pipe replacement or to checking for other leaks. The city's permit sheet would treat a pipe replacement as new work.

Boundary and ZIP questions at the Diamond Bar edge

Pomona borders Diamond Bar. The County's ZIP code list shows 91789 covering Walnut, Rowland Heights, Diamond Bar, the City of Industry and Pomona, and the list is dated 2022. A ZIP alone does not tell you which city issues the permit, so use the street address.

If your address is in Pomona, the city's rules above apply. If it is in Diamond Bar or unincorporated, they do not. Call (833) 571-0120 with the street address and the plumber will confirm service for your block.

Common calls from Pomona homes

• A stain on a ceiling: where leak tracing begins.
• Water on the floor now: drying a flooded room.
• Tank water heater out of hot water: repairing a leaking tank.
• Toilets and drains that overflow: fixing a clogging toilet.

Pomona: what to ask when an old fixture finally fails

In an older house, parts tend to fail in sequence. A leaking angle stop under a sink is often followed by a tired supply line and then a worn valve elsewhere.

• Ask whether the shutoff valves under the fixtures still close fully.
• Ask whether the supply lines are the braided kind or older rigid tubing.
• Ask whether doing two fixtures in one visit saves a second trip.

Replacing a valve that cannot shut off is worth doing while the water is already off. A plumber can spot the next likely failure in the same visit, and you can decide whether to deal with it now or watch it.

Pomona on the map

Boundaries between cities, unincorporated pockets and water districts sit close together here, so give the full street address when you call.