Plumber in El Monte, CA

El Monte Sewer Lines

Who Looks After El Monte’s Sewers?

The city looks after its own mains. El Monte’s Public Works Department maintains more than 130 miles of sanitary sewer and seven pump stations, by its own count, and says most of those lines were installed over 50 years ago and are vitrified clay pipe between 6 and 12 inches across. City crews inspect the mains with a camera truck after cleaning them. The city also sets its own sewer service charges, billed on the property tax roll; its 2025 rate study found the rate schedule had not changed since July 2008 and set out a five-year plan for replacing aging sewers and manholes and renewing pump stations. On Los Angeles County’s sewer maintenance map, nearly every point we sampled inside El Monte lies outside the county’s Consolidated Sewer Maintenance District, which does take in several neighboring cities, so across nearly all of El Monte a fault in a public main goes to the city.

From those mains, the city’s wastewater flows by gravity into trunk sewers belonging to the Sanitation Districts of Los Angeles County, which carry it on to their treatment plants. The environmental study for a 2021 city sewer project traced one neighborhood’s flow south along Santa Anita Avenue to the Districts’ Whittier Narrows Water Reclamation Plant, which treats wastewater for about 150,000 people and sends its recycled water to groundwater recharge and landscape irrigation. Connecting a building to the sewer also takes clearance from the Sanitation Districts.

Some of El Monte’s oldest mains never ran under a street. Around Nevada Avenue and Bodger Street, the city found 93-year-old sewer pipe running through private backyard easements, hard for its crews to reach, and planned new mains in the streets instead, with new 4-inch laterals built from each home’s existing cleanout out to the new pipe.

Where the Owner’s Lateral Ends

The municipal code and the city sewer documents we read do not spell out where an owner’s lateral stops and the city’s responsibility starts. The city’s fact sheet for the Nevada Avenue project draws the line this way: a private sewer lateral from the house to a private cleanout, then the property line, the city sidewalk and the city street, with the city main beyond them. If a lateral is failing past your property line, ask the Public Works Engineering Division at (626) 580-2058 what applies to your address before any work in the street is planned.

Excavation Permits and Our Part of the Job

Nobody may excavate in or under a city street without a written permit from the City Engineer, and the code treats a house or lateral connection as a class of street cut of its own: work has to begin within ten days of the permit, be backfilled within three working days of starting, and never be left open over a weekend. A street that was paved or repaved within the last five years may not be cut at all, except in an emergency or another case the City Engineer approves. The city’s encroachment permit asks for an applicable state contractor’s license and does not name a license class for this work.

Our part works like this. We clear El Monte laterals all the way to the city main. When the pipe needs repair, we weigh the trenchless methods before anything else and dig only when the pipe leaves no other choice. If a repair would mean breaking open the street, we take on that section too, under the City Engineer’s permit and the city’s rules for street cuts.

If Sewage Backs Up in an El Monte Home

• Stop using water. Every sink, toilet, shower and washer in the house, and in a back unit on the same line, drains into that lateral, so each one adds to the overflow.

• Look at the street. Sewage coming out of a manhole points to a city main. The city takes sewer spill reports at (626) 580-2250, Monday through Thursday from 7 a.m. to 5:30 p.m., and through police dispatch at (626) 580-2100 after hours; its maintenance division keeps standby crews on duty around the clock, which the police reach by pager.

• Street clear, house still backing up? Then the stoppage is most likely in your own lateral, and that is a call to us.

Does El Monte Require a Sewer Inspection When a House Sells?

Not now. El Monte used to require real property inspection reports for residential and commercial properties, and the City Council removed that requirement from the municipal code in June 2025. We found no city rule calling for a sewer lateral inspection at a sale or a remodel. A buyer who wants the line on record before closing can book our buyer’s sewer camera inspection, a paid visit that includes the video and a written summary.

El Monte Water

Who Supplies Water in El Monte?

It depends on the street. The city’s Water Department says an El Monte address can be served by one of eight providers, its own system included, and its published list names seven: the City of El Monte Water Department, San Gabriel Valley Water Company, California American Water, Golden State Water, and three mutual water companies, Del Rio, Hemlock and Rurban Homes. We sampled the State Water Resources Control Board’s map of water system boundaries at about 1,080 points inside the city and compared the result with Los Angeles County’s water purveyor map. The two agreed on the broad pattern. San Gabriel Valley Water Company covered the largest share, about six points in ten, spread across the city. The city’s own system came next, a little over a fifth, through the middle of El Monte. California American Water took about a tenth, on the western side, and Golden State Water a strip in the north. Small mutual water companies, including Del Rio, Sterling and Hemlock, appeared in pockets on the east side and in one area to the south. Those are approximate lines, and the name on your water bill is the one that counts.

The two largest suppliers both pump groundwater. The city’s water quality report for 2025 says its supply is groundwater from the main basin beneath the San Gabriel Valley, pumped by production wells, and is disinfected with chlorine, and it lists total hardness averaging 235 parts per million, in a range of 190 to 260. San Gabriel Valley Water Company’s report for 2025 says that, apart from one service area outside the city, its customers received groundwater from the same basin that year, and gives an average hardness of about 236 parts per million for its groundwater, from samples taken between 2022 and 2025 that ranged from about 91 to 355. Those are the suppliers’ own figures, and each of the other companies publishes a report too.

Meters, Leaks and Shared Services

For customers of the city’s system, the municipal code sets a few rules worth knowing. All water used on a metered property has to pass through the meter, with no bypass between the meter and the main, and the customer pays for whatever goes through it. No customer may allow leaks in the pipes or fixtures on the premises. The Water Superintendent can require an approved check valve on the property side of the meter, installed at the customer’s expense. And where one owner has two or more separate households on a property, the code calls for an independent service to the curb for each one, unless the owner agrees in writing to pay for all of the water used there. The city sends meter leaks, missing meter lids and backflow requirements to Public Works and handles billing at the Water Desk, (626) 580-2024, Monday through Thursday; after hours, its standby water operator is reached through police dispatch at (626) 580-2100. On your side of the meter, a house shutoff that has seized or will not close is something we replace with a working emergency shutoff valve. Customers of another supplier call that company instead, San Gabriel Valley Water Company, for instance, at (626) 448-6183.

Additional Information

El Monte plumbing permits: who issues them, and can I pull my own?

The Building Division, at City Hall West, 11333 Valley Boulevard, issues plumbing and sewer permits and inspects the work. Its counter is open Monday through Thursday from 8 a.m. to 4 p.m., with the waitlist closing at 3, City Hall is closed on Fridays, and the division answers at (626) 580-2050. The city says a properly licensed contractor is required to secure permits in general and allows owner-builder permits only for residential projects, and under a policy in effect since July 2025, construction work on commercial and multifamily projects above a small dollar threshold has to be done by contractors licensed by the state. An owner-builder signs the city’s disclosure forms and becomes the party responsible for the work, with the owner’s identity and signature checked when the permit is issued. We can pull the permit for you, or, if the property is your own residential project, you can pull it yourself as an owner-builder; for a commercial or multifamily property, the permit and the work go to a licensed contractor.

Is an earthquake gas valve required in El Monte?

We found no El Monte requirement for one. The city adopts the Los Angeles County plumbing code by reference and changes only its administration, fees and appendices, and none of the city’s building chapters we read adds a rule for seismic gas shutoff valves. Fitting one is still permitted work: the city’s plumbing permit application lists a seismic gas shutoff valve among the items that get their own plan review. Ours are motion-type valves, and our El Monte gas line page explains the piping that goes with them.

Call Rooter & Plumbing Masters in El Monte

Rooter & Plumbing Masters is veteran-owned, and our office and crews speak English and Spanish. A toilet in the back unit that gurgles whenever the front house runs the washer, a water bill that climbs while nothing is running, a shutoff valve that will not turn: each one costs less to deal with now than after it puts water on the floor.

Call (888) 855-6680 at any hour for a free estimate at your El Monte home, back unit, rental or business.