Plumbing, Heating and Air Conditioning Services in Cerritos, CA

Downey Plumbing Heating & Air Conditioning provides licensed plumbing, heating, air conditioning, and commercial service to homeowners and businesses in Cerritos, CA. We hold CA License #731172 with the Contractors State License Board, carry full insurance, and maintain a BBB A+ rating backed by a 4.8-star record across 850+ Yelp reviews. Our Downey-based team has served the Gateway Cities and greater Southern California since 1930 and takes emergency calls 24/7. Call 562-646-1221 to schedule water heater, drain, leak, AC, or heating service in Cerritos.

Cerritos sits a short drive from our Downey base along the 605 and 91 freeways, and its homes reflect a clear history: builders turned dairy land into planned residential tracts during the late 1960s and 1970s. That building boom left thousands of homes whose original piping, drain lines, and ductwork now approach or pass five decades of service. Our technicians know how those systems behave at this stage of life.

Available 24/7 for emergency and scheduled service throughout Cerritos. Call 562-646-1221 or request service online.

About Cerritos, CA: Local Plumbing and HVAC Context

Cerritos covers about 8.9 square miles of southeast Los Angeles County and uses ZIP code 90703. The 2020 Census counted 49,578 residents, and owners occupy about 76 percent of Cerritos homes, according to U.S. Census Bureau Quick Facts. The 91 freeway crosses the center of the city, the 605 runs along its west side, and the 5 touches its northeast corner.

Technician was Very Supportive, Very Knowledgeable

“Technician was very supportive, very knowledgeable in his skills. Showed interest in making sure the customer understands. Went above and beyond to explain my options. Thanks Downey Plumbing!”

- Cheryl S.

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Cerritos incorporated as Dairy Valley in 1956 and took its present name in 1967. Residential tracts replaced the dairy farms quickly, and the population climbed from about 15,900 in the 1970 Census to more than 40,000 within a few years. Most Cerritos homes therefore date to the late 1960s through the 1970s.

The City of Cerritos runs its own water utility, which maintains about 15,350 service connections citywide. According to the City’s 2025 Consumer Confidence Report, three wells in the Central Groundwater Basin supplied about 97.7 percent of the city’s water in 2025, and Metropolitan Water District supply covered the rest. Total hardness measured near 180 ppm, with a reported range of roughly 170 to 200 ppm. That equals about 10.5 grains per gallon, enough to build scale in water heaters, tankless heat exchangers, and fixtures over time.

The City’s water utility also reports that its division found no lead or galvanized service lines requiring replacement. That finding applies to the City’s service lines. The piping inside each home ages on its own schedule.

Cerritos has a Mediterranean climate with warm, dry summers and mild winters. Air conditioning runs for months each year, while heating works mainly on cold mornings from late November through February.

Plumbing Services for Cerritos Homes and Businesses

Our licensed plumbers match each service to the conditions that Cerritos homes and businesses actually face.

Slab Leak Detection and Pinhole Leak Repair

Many Cerritos homes sit on concrete slabs with copper supply lines routed beneath the floor, and those lines can develop pinhole leaks after decades of service. Warm floor spots, the sound of running water with every fixture off, a moving water meter, or damp baseboards all point to a leak worth investigating.

We pinpoint the leak with acoustic and electronic equipment before anyone cuts concrete, then explain the repair options. Learn more about our slab leak detection and repair, water leak detection, and pinhole leak repair services.

Water Heater Repair and Replacement

Cerritos water measures near 180 ppm of hardness, so tank water heaters collect sediment and tankless heat exchangers collect scale over time. We install and repair tank water heaters and tankless water heaters, and our hot water heater services include flushing and descaling on a maintenance schedule. Every replacement includes seismic strapping under California Health and Safety Code Section 19211 and a permit through the City of Cerritos Building and Safety Division.

Drain Cleaning, Sewer Lines, and Camera Inspection

Established landscaping and original sewer laterals make root intrusion a recurring cause of slow drains and backups in Cerritos neighborhoods. We start with a sewer camera inspection so the diagnosis comes from the pipe itself, then clear the line with drain cleaning or hydro jetting. Where a lateral lacks an access point, we add a sewer clean-out.

Repiping and Whole-Home Plumbing Checkups

Homes with five decades of wear benefit from a whole-home plumbing system checkup that tests pressure, inspects shutoff valves, and evaluates supply and drain condition. When pipe condition calls for replacement, we handle water line repair and replacement, copper repiping, and PEX repiping.

Water Treatment and Fixture Repair

At about 10.5 grains per gallon, Cerritos water leaves scale on fixtures and inside appliances. Water filtration and softening systems and reverse osmosis systems reduce that scale at the source. We also repair and replace toilets, faucets, bathtubs, and garbage disposals.

Gas Lines, Tagged Meters, and Backflow Testing

SoCalGas supplies natural gas in Cerritos. We install and repair gas lines and complete tagged gas meter repairs so the utility can restore service. We also perform backflow testing on irrigation, fire, and commercial water assemblies.

Air Conditioning Services in Cerritos

Cerritos homes cool through long, dry summers and the warm spells that follow. We repair, maintain, and replace residential cooling systems for every kind of home in the city.

AC Repair and Emergency Cooling Service

A failed system on a hot afternoon needs a fast, accurate diagnosis. Our air conditioning repair technicians test capacitors, contactors, fan motors, refrigerant pressures, and control boards, and they repair most failures with parts stocked on the truck.

Seasonal AC Maintenance

A spring tune-up cleans coils, tests electrical components, verifies refrigerant levels, and clears the condensate drain. Our AC maintenance visit and our HVAC preventative maintenance plan give Cerritos homeowners a repeatable schedule that catches weak parts before the first heat wave.

AC Replacement and Ductwork

Original ductwork in 1970s attics ages along with the equipment, and leaky or undersized ducts keep even a new system from performing. We pair every AC installation and replacement with a duct inspection and handle ducting replacement when ducts have reached the end of their life.

Mini-Splits for Additions and Accessory Dwelling Units

Garage conversions, additions, and accessory dwelling units often lack ductwork. A ductless mini-split provides efficient heating and cooling to those spaces without major construction.

Condensers, Compressors, Refrigerant, and Thermostats

We repair and replace the outdoor AC condenser and the HVAC compressor, handle refrigerant recharging and recovery under EPA refrigerant-handling rules, and install thermostats that match the equipment.

Heating Services in Cerritos

Cerritos heating season runs from late November through February, and early fall is the best time to service equipment that has sat idle since last winter.

Furnaces, Wall Heaters, and Heat Pumps

We repair igniters, flame sensors, blower motors, and control boards through our heating repair service, and a seasonal heating maintenance visit checks combustion, airflow, and safety controls. Our team also handles gas furnace services, wall furnace repair, and heat pump services. When equipment reaches the end of its service life, heating installation covers the replacement.

Commercial Plumbing and HVAC in Cerritos

Cerritos has a large commercial base, including Los Cerritos Center, Cerritos Towne Center, Cerritos Auto Square, the Cerritos Industrial Park, and neighborhood shopping centers along Studebaker Road, Bloomfield Avenue, Artesia Boulevard, and Norwalk Boulevard. Our commercial plumbing and HVAC team works around business hours and responds to emergencies at any hour.

Restaurants and food service tenants rely on commercial grease trap service and commercial drain services to keep kitchens running during peak meal periods. We document each service visit so owners have the records they need for inspections.

Offices, retail spaces, and industrial tenants also use our commercial water heater service, rooftop unit service, and commercial AC repair. Our commercial plumbing work covers restrooms, kitchens, and building water systems.

Cerritos Neighborhoods and Local Knowledge

• Residential tracts from the late 1960s through the 1970s: Homes with original supply lines, drain laterals, and attic ductwork that now call for inspection and planned replacement.
• Planned townhome and condominium communities: Shared walls and individual water heaters call for coordination with HOA boards and property managers.
• Los Cerritos Center and the Studebaker Road corridor: Large retail and restaurant tenants with commercial water heaters, rooftop units, and grease traps.
• Cerritos Towne Center and the 91 freeway corridor: Office, hotel, and mixed-use buildings with central plumbing and HVAC systems.
• Cerritos Industrial Park: Light manufacturing and assembly tenants with industrial drains, water heaters, and rooftop HVAC.
• Cerritos Auto Square: Dealership showrooms and service bays with floor drains, water heaters, and high-volume HVAC.

The Building and Safety Division of the City of Cerritos Department of Community Development issues plumbing, mechanical, electrical, and building permits at City Hall, 18125 Bloomfield Avenue. The City’s permit application lists water heaters, gas piping, drainage and vent repairs, furnaces and heaters, and air handling units among its work items. We prepare the application with our contractor license details, schedule the inspections, and complete the final approval.

Our Service Process for Cerritos Customers

• Call 562-646-1221 at any hour or send an online request to book same-day or scheduled service in Cerritos.
• A dispatcher records the symptoms, your address, and the best arrival window, then assigns a licensed technician.
• The technician arrives with diagnostic tools and stocked parts for common repairs.
• We explain the findings and every option before work starts.
• We file City of Cerritos permits for qualifying work and book the inspection.
• We complete the work to California Plumbing Code, Mechanical Code, and Title 24 standards.
• We test the system, clean up, and walk you through the results.

Why Cerritos Residents and Businesses Choose Downey Plumbing Heating & Air Conditioning

Review our CSLB license record, our BBB A+ profile, and our 850+ Yelp reviews at any time to confirm what Cerritos customers read here.

Common Plumbing and HVAC Problems We Solve in Cerritos

• Slab leaks and pinhole leaks in copper supply lines approaching five decades of service
• Sediment and scale in water heaters that run on water near 180 ppm hardness
• Root intrusion and aging laterals behind recurring drain backups
• Attic ductwork that has aged with the original system and limits cooling and heating performance
• AC breakdowns during long, dry summers
• Furnace and wall heater failures on the first cold nights of the season
• Grease, drain, and water heater problems in busy Cerritos restaurants and retail centers

Frequently Asked Questions: Plumbing and HVAC in Cerritos, CA

Do you provide 24/7 emergency plumbing and HVAC service in Cerritos?

Yes. We take emergency calls in Cerritos at any hour, including nights, weekends, and holidays. Cerritos sits a short drive from our Downey base along the 605 and 91 freeways, so a licensed technician can reach every neighborhood quickly. We respond to burst pipes, leaking water heaters, drain backups, tagged gas meters, and AC or heating failures.

What plumbing problems are most common in Cerritos homes?

Most Cerritos homes date to the late 1960s through the 1970s, so original piping, drain laterals, and water heaters are reaching the end of their service life. The most frequent problems are slab leaks, pinhole leaks in copper lines, root intrusion in sewer laterals, failing shutoff valves, and sediment in water heaters. A whole-home plumbing checkup finds these issues early.

Where does Cerritos water come from, and how hard is it?

The City of Cerritos runs its own water utility. In 2025, three wells in the Central Groundwater Basin supplied about 97.7 percent of the water, and Metropolitan Water District supply covered the rest, according to the City’s Consumer Confidence Report. Total hardness measured near 180 ppm, or about 10.5 grains per gallon, which builds scale in water heaters and fixtures over time.

Does Cerritos require permits for water heater, furnace, or AC work?

Yes. The City of Cerritos Building and Safety Division issues plumbing and mechanical permits, and its permit application lists water heaters, gas piping, drainage and vent repairs, furnaces and heaters, and air handling units among the work items. We prepare the application, schedule the inspections, and complete the final approval so the work meets code.

The City reports no lead or galvanized service lines needing replacement. Does my home plumbing still need attention?

The City’s finding applies to its service lines, which connect the water main to the property. The piping inside your home ages on its own schedule. Copper lines, shutoff valves, and fixtures from the 1960s and 1970s can still develop pinhole leaks or corrosion, so a plumbing checkup remains worthwhile.

How do you locate a slab leak in a Cerritos home?

We listen for escaping water with acoustic equipment, confirm the zone with pressure testing and electronic tracing, and mark the exact spot on the floor. Then we explain whether a spot repair, a reroute through the attic or walls, or repiping makes the most sense. This approach opens only the area that needs repair.

Why do some Cerritos homes get recurring sewer backups?

Original clay or cast iron laterals develop cracks and offset joints over decades, and roots from established landscaping enter those openings. Grease and debris then catch on the roughened pipe wall. A camera inspection shows the cause, hydro jetting clears the line, and a clean-out installed at the property makes later service easier.

How often should I service my water heater in Cerritos?

Flush a tank water heater once a year to remove sediment, and descale a tankless unit about every 12 to 18 months or on the manufacturer’s schedule. At roughly 180 ppm hardness, Cerritos water leaves mineral deposits steadily. A technician also inspects the anode rod, temperature and pressure relief valve, seismic straps, and venting during each visit.

Can I replace my water heater with a tankless model in Cerritos?

Usually, yes, but the home needs the right gas supply, venting, and clearances. We check the gas line size, vent path, and electrical outlet, then size the unit for your simultaneous hot water demand. If the existing gas line falls short, we upgrade it as part of the project and pull the City of Cerritos permit.

What causes AC problems in Cerritos homes with original ductwork?

Attic ducts from the 1970s often have loose connections, crushed sections, and brittle insulation that leak cooled air before it reaches the rooms. The AC then runs longer, and rooms at the end of the duct run stay warm. We inspect ducts during AC service and recommend sealing, repair, or ducting replacement when needed.

When should I schedule AC and heating maintenance in Cerritos?

Book AC maintenance in spring and heating maintenance in early fall. A cooling visit covers coils, capacitors, refrigerant levels, and the condensate drain, while a heating visit covers igniters, burners, heat exchangers, blower motors, and safety controls. Maintenance finds weak parts before they fail during a heat wave or the first cold snap.

Do you install ductless mini-splits for additions and accessory dwelling units in Cerritos?

Yes. A ductless mini-split heats and cools a garage conversion, addition, or accessory dwelling unit without extending ductwork. We size the system, install the indoor and outdoor units, complete the electrical connection, and handle the permit and inspection through the City of Cerritos Building and Safety Division.

Do you repair wall heaters and furnaces in Cerritos?

Yes. We repair gas furnaces, wall heaters, and heat pumps, including igniters, flame sensors, thermocouples, blower motors, and control boards. We also replace units that have reached the end of their service life and explain the options, including heat pumps and ductless systems.

Which Cerritos commercial districts do you serve?

We serve the Los Cerritos Center area, the Cerritos Towne Center and 91 freeway corridor, Cerritos Auto Square, the Cerritos Industrial Park, and neighborhood shopping centers along Studebaker Road, Bloomfield Avenue, Artesia Boulevard, and Norwalk Boulevard. Our commercial team handles plumbing, grease traps, water heaters, rooftop units, and emergency repairs, and it schedules work around business hours.

Can you service grease traps for Cerritos restaurants?

Yes. We install, repair, and service grease traps and interceptors, clear kitchen drain lines, and document each visit for your maintenance records. Regular service keeps flow steady during peak meal periods and supports compliance with local grease control rules.

Do you test backflow assemblies in Cerritos?

Yes. Irrigation, fire, and commercial water services often include backflow assemblies that need testing on a set schedule. A certified tester checks each assembly, repairs or replaces failed components, and sends the results to the water provider, which is the City of Cerritos Water Utility.

What are the signs that a Cerritos home needs repiping?

Look for pressure that drops across several fixtures, discolored water, repeat pinhole leaks, green or white corrosion on pipe joints, and a water meter that moves with every fixture off. These patterns often mean the pipe wall is thinning in more than one place. A plumbing checkup compares spot repairs with copper or PEX repiping.

What happens when SoCalGas tags a gas meter at my Cerritos home?

A tag means the utility found a condition that needs correction before service can continue. A licensed plumber locates the issue, repairs the gas line or appliance connection, pulls the permit, and arranges the inspection so SoCalGas can restore service. We keep you informed at each step.

Which Cerritos neighborhoods and nearby cities do you serve?

We serve all of ZIP code 90703, including residential tracts, townhome and condominium communities, and the Los Cerritos Center, Towne Center, Auto Square, and Industrial Park districts. We also serve nearby cities such as Artesia, Lakewood, Bellflower, Norwalk, Santa Fe Springs, La Mirada, Hawaiian Gardens, Buena Park, La Palma, and Cypress.

How do I schedule service in Cerritos, and what should I have ready?

Call us or send an online request, and tell us what the system is doing, how old the equipment is, and when the problem started. A dispatcher confirms your address and arrival window, and the technician explains the diagnosis and options before starting work. Knowing where the equipment sits and how to reach it speeds up the visit.

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