Plumber in West Covina, CA

Your Sewer Line to the Street

West Covina Sewer Line Responsibility: Homeowner or City?

In West Covina, the homeowner is responsible for the sewer line from the house all the way to the city’s main in the street, including the part under the sidewalk, the parkway and the street itself. The city maintains only the main line. That is the rule in West Covina’s municipal code: its house connection sewer division requires the owner of the property served to keep the connection between the public main and the building safe and sanitary, and to keep every required safeguard in working order. There is one exception. If the city verifies that a city-authorized, city-owned street tree damaged or blocked the stretch between the main and the right-of-way line, the city pays to repair that stretch. Everything from the right-of-way line to the house is still the owner’s to pay for, and the city’s Public Works page says the same thing in plainer words: the city may help after it has confirmed that one of its own trees did the damage.

The city’s part is a system that its sewer system management plan measured at about 227 miles of gravity sewer, two short force mains and 5,187 manholes, with its last full capacity study done in 2009. In September 2026 the city put out a request for proposals to update its sewer master plan, to keep up with regulation and, in its words, to address aging infrastructure. From the city mains, sewage passes into the trunk sewers of the Sanitation Districts of Los Angeles County. West Covina is in District No. 22, a district including Covina, Baldwin Park, Walnut, Azusa, Glendora and the other cities of the eastern valley, and one of the members of the Districts’ regional Joint Outfall System. The trunk pipe under the city is old enough to need work of its own: in 2024 the Districts filed an emergency project to line about 20,700 feet of corroded concrete and cast iron trunk sewer in West Covina and Covina, 10 to 24 inches across, with a cured-in-place liner, and to coat 92 manholes.

What the City Requires of the Line Itself

• A permit from the city engineer. House connection sewer work starts with a written application that describes the lot served, and the permit issues once the fees set by council resolution are paid. The city’s fee schedule lists a sewer lateral as a Class I permit with plan check, and its permit checklist asks for a general liability certificate of one million dollars naming the city for any work in a public street, sidewalk or parkway.

• A straight run with a real fall. From the public sewer to the street property line the pipe runs straight, with a fall of at least one foot in fifty toward the main unless the city engineer allows otherwise in writing; inside the property it runs straight between cleanouts at a grade of at least a quarter inch per foot. Under a public street the pipe sits at least four feet below grade.

• A test before approval. The line from the property line to its upper end has to pass a static water pressure test or an air test, and a line that leaks at any point, fittings included, is not approved.

• A new tap by a licensed sewer contractor. Where the connection has to tap the public sewer at a point with no existing branch, the code requires a licensed sewer contractor to make it with a city inspector present.

Our side of it is simple. We clear a West Covina house connection from the cleanout to the city main, and if the pipe has to be repaired we do that too, the full length to the main, parkway and street stretch included, under the permits the city issues for it. No-dig methods come first; we open a trench only when the pipe’s condition leaves nothing else.

Who Is Responsible for a Sewer Line Blockage Under the Sidewalk in West Covina?

Usually the homeowner. Under the city’s code, the pipe under the sidewalk is part of your house connection, so a blockage there is yours to have cleared, unless the city confirms that one of its trees caused it. We clear the line from your cleanout all the way to the city main, and the camera that follows shows where the blockage was and what caused it.

What to Do When a West Covina Sewer Line Backs Up

• Stop using water until the line is clear, so the backup does not come up through a floor drain or the lowest toilet in the house. Everything in the house drains into that one connection, so every flush and every load of laundry adds to what is rising at the lowest drain.

• Look at the manhole in the street. If sewage is coming up through it, the problem is the city main, not your line. The city reports its sanitary sewer overflows to the state’s database, so report it: call the Public Works Maintenance Division at (626) 939-8458, or City Hall at (626) 939-8400. Street dry and the house still backing up? Then the blockage is almost certainly in your own house connection, and that is a call to us.

• Have the line cleared from the cleanout and inspected with a camera. Our West Covina sewer camera inspection shows where along the line the problem sits, and you get a copy of the footage.

• If a street tree may be the cause, contact the city before any repair under the parkway or street. The city pays for that stretch only when it verifies the cause itself, so call the Public Works Maintenance Division first and keep the camera footage.

• Not sure where your sewer connection is? The Public Works Department at West Covina City Hall keeps the permits and sewer maps for each address, and you can look yours up there.

West Covina Water

Who Supplies Water in West Covina?

It depends on the address: the city’s own directory of water utilities lists eight companies and districts for its residents. For most of the city the bill comes from Suburban Water Systems, whose San Jose Hills system, by the company’s 2025 water quality report, serves West Covina and portions of Walnut, Hacienda Heights, La Puente and the City of Industry, about 170,000 people in all, and whose office is on East Garvey Avenue North in West Covina itself. Walnut Valley Water District, based in Walnut, says it serves portions of West Covina, and Valencia Heights Water Company, a mutual company founded in 1912 to irrigate citrus groves and based on East Virginia Avenue, serves homes across Covina and West Covina. The directory also lists Valley County Water District, San Gabriel Valley Water Company and others. Not sure which one is yours? The name is on the water bill.

How Hard Is West Covina Water?

Suburban answers that itself. Its 2025 report says the San Jose Hills system drew 88 percent of its supply that year from the company’s own wells in the Main San Gabriel Groundwater Basin and bought treated surface water for the rest from the Metropolitan Water District of Southern California and the Covina Valley Water Company. The groundwater averaged 163 parts per million of hardness, or about nine and a half grains per gallon, across a range of 85 to 280; the purchased water averaged 217 parts per million, or about 12.7 grains, across a range of 170 to 304. The report explains that the white residue left when water dries on a surface is a product of hardness, that the minerals are naturally occurring and pose no health risk, and that the deposits, usually calcium, form in hot and cold water alike. Those are the utility’s own words and numbers. What they mean for a plumber is scale: in water heaters, in the aerators and cartridges of faucets, and in the valves that stop working after years without being turned.

Shutoffs and Water Emergencies

For a leak on the utility’s side of the meter, Suburban takes reports around the clock, on (626) 543-2640 during the day and (562) 464-1843 after hours, and each of the other companies in the city’s directory lists its own emergency line. On your side of the meter, a house shutoff that has seized or no longer closes all the way is one we replace with a working emergency shutoff valve, and a shutoff that turns freely is worth knowing the location of before the night you need it. We also test and repair backflow prevention devices on commercial and irrigation lines.

Additional Information

Do I need a permit for plumbing work in West Covina, and may an owner apply?

Often, yes. West Covina adopts the 2022 California Plumbing Code through Title 28 of the Los Angeles County Code, and the city’s Building Division handout lists what needs a permit: any new, replacement, relocated or altered water heater; any new, relocated or altered gas line; new drain, waste or vent piping, traps or valves; fixtures at a location where none existed before; and new sprinkler systems and backflow devices. Clearing a stoppage, repairing a leak and replacing a sink, toilet or tub in the same place need no permit, provided the pipes, valves and traps stay where they are. Permits come from the Building Division at 1444 West Garvey Avenue South, Room 215, (626) 939-8425, open Monday through Thursday from 7:30 in the morning to 5:30 in the afternoon and closed on Fridays; applications are taken over the counter or by email. The city issues permits to licensed contractors and to property owners, who bring photo identification and, after a recent change of ownership, proof that they own the property. So the choice is yours: we can pull the permit for you, or you can pull it yourself as the owner. We tell you at the estimate whether your job needs one.

Is an earthquake gas valve required in West Covina?

We found no West Covina rule requiring one. The city adopts the county’s plumbing code without a seismic shutoff amendment of its own, and the county’s own plumbing plan check checklist says the valves are not mandatory where its code applies, though it has become common for applicants to install them; when one goes in, the checklist asks that its pressure loss be counted in sizing the gas piping. Installing a valve is still permitted gas work. The valves we fit are motion-type, and our West Covina gas line page explains the gas piping work that goes with them.

Can I drain my pool into the street in West Covina?

No. The city’s own answer is that a pool cannot be drained into the street and must be drained into the sewer system, usually through the exterior cleanout. Find your cleanout and make sure its cap comes off before draining day. If it is buried or damaged, that is a plumbing fix to make first.

Call Our West Covina Plumbers

Our office and crews speak English and Spanish. Drain and sewer lines that have been in the ground since the 1950s give little warning before they fail. If drains are slowing all over the house, a toilet gurgles when the washer empties, or water rises at the cleanout, call before the line backs up into the house.

Call us at (888) 855-6680 at any hour for a free estimate at your West Covina home, apartment building or business.