Plumber Covina 91724 | East Side Covina Plumbing

Covina 91724 at a glance

ZIP 91724 covers the eastern side of Covina plus unincorporated Charter Oak, about 27,180 people in the 2020 Census across the whole ZIP area.

ZIP population: 27,180 (2020 Census, whole ZIP area, which reaches past city limits)
Also in this ZIP: Charter Oak, an unincorporated community under Los Angeles County rules
Schools: Charter Oak Unified serves the eastern portion of Covina
High school: Charter Oak High School, 1430 E Covina Blvd, opened in 1959
Water office in the ZIP: Suburban Water Systems, 1325 N Grand Ave, Suite 100
Possible water suppliers: City of Covina Water, Suburban, Golden State Water and Valencia Heights Water, by address
Median listing price: About $875K in 91724 (Redfin, November 2026)
Permits: City of Covina Building and Safety for city addresses; LA County Public Works for county pockets

Our office is on E Edna Pl in Covina, so the 91724 side of town is close to home for us. We get calls from here for the same jobs we see across Covina: water heaters at the end of their life, slow drains, and sewer laterals full of roots. What makes 91724 different is paperwork. Two homes on the same block can have different water companies. A home that looks like it is in Covina can sit in a county pocket. Getting those two facts right first saves you a wasted permit trip and a call to the wrong utility.

This page is about the parts of 91724 inside the City of Covina, and how to tell whether your address is one of them. If you live in the unincorporated community north and east of here, our Charter Oak page covers County permits, the County sewer district and Charter Oak history in detail.

Is your 91724 address in the City of Covina or LA County?

A 91724 mailing address does not prove you are in the City of Covina; the City says about 11 county pockets sit inside its borders, and those go to LA County for building permits.

The City of Covina publishes a short guide to this question. Here is what it says, in plain terms:

Search the City GIS viewer. A gray parcel means County. A colored parcel with a Covina zone means City.
Look at the street number. Covina addresses are usually 2999 or lower. The City's location page says numbers above 2999 are generally not City of Covina addresses.
Look at where you are. The City says properties south of the 10 Freeway and east of Grand Avenue are likely in the County.
Look at the street signs. Covina street signs are green and often carry the City logo. Blue signs suggest County territory.
Use the County tools. The EPIC-LA permit helper shows the jurisdiction after you search an address. The LA County Public Works service locator lists which County services apply.

Grand Ave matters for one more reason. Suburban Water Systems keeps its Covina office at 1325 N Grand Ave, and Grand Ave is also the traditional western edge of Charter Oak. If you live near Grand, check before you assume.

What changes for a 91724 home depending on jurisdiction
Question	City of Covina address	County pocket or Charter Oak address
Who issues plumbing permits	City Building and Safety, 125 E College St, in person	LA County Public Works Building and Safety, applied for through EPIC-LA
Water heater rules handout	City Handout #12, effective January 1, 2026	County requirements; ask the County office
Who maintains the local sewer main	City of Covina Public Works	LA County Public Works sewer maintenance
Who maintains the lateral to your house	You, the property owner	You, the property owner
Who supplies water	The company named on your bill	The company named on your bill

Who supplies water in east Covina 91724

East Covina can be served by any of four water companies, so the name printed on your bill is the only reliable answer to who your supplier is.

The City's own purveyor list names six water suppliers inside Covina. On the east side, the four you are most likely to see are the City of Covina Water Division, Suburban Water Systems, Golden State Water and Valencia Heights Water Company. Golden State Water says its San Dimas service area covers portions of Charter Oak, Covina, Glendora, La Verne, San Dimas and Walnut.

Water suppliers you may find on a 91724 bill, from the City of Covina purveyor list and supplier pages
Supplier	Office	Phone	Notes
City of Covina Water Division	534 N Barranca Ave, Covina	626-384-5220	About 8,500 connections; Level 2 shortage rules apply to City customers
Suburban Water Systems	1325 N Grand Ave, Suite 100, Covina	626-543-2640	Privately owned utility; after-hours leaks (562) 464-1843 per West Covina's listing
Golden State Water (San Dimas system)	Toll-free line	800-999-4033; local 909-394-2272	Serves portions of Covina and Charter Oak
Valencia Heights Water Company	3009 E Virginia Ave, West Covina	626-332-8935	Open Monday to Thursday, closed Fridays; after-hours emergency mailbox on the same number

Why the supplier matters to a plumber

Your supplier owns the meter and the service line up to it. If water is spraying at the meter box or in the street, that is the supplier's call, not ours. Past the meter, the pipe is yours. When we shut off water for a repair, we use your house valve. If that valve is seized, we may need the supplier to close the meter side, and that depends on whose meter it is.

The supplier also sets the water you live with. Hardness, chlorine or chloramine, and any shortage rules come from your water company. That is why we ask for the name on your bill before we size a water softener or quote a tankless heater.

Suburban's two offices

The City of Covina purveyor list puts Suburban at 1325 N Grand Ave in Covina 91724, with the phone numbers 626-543-2640 and 626-543-2500. The City of West Covina's utility page lists Suburban's office at 2235 E Garvey Ave N in West Covina, open 8 a.m. to 4:30 p.m. Monday to Friday, with an after-hours emergency leak line of (562) 464-1843. If you are a Suburban customer with a leak at the meter at night, that is the number to try.

How hard is the water in 91724?

East Covina water is hard: the City of Covina reported about 13.5 grains per gallon in 2025, and Golden State Water's San Dimas system reported about 12 grains.

Those two numbers come from each supplier's annual Consumer Confidence Report. The City's report calls its water very hard. Golden State's number is close behind on average, though its range is wide, from 5 to 18 grains depending on the source blended that day.

Published hardness for two suppliers serving parts of 91724 (2025 data)
Supplier	Average hardness	Range	Source
City of Covina Water	230 mg/L, about 13.5 grains per gallon	190 to 280 mg/L	City 2025 CCR
Golden State Water, San Dimas system	205 mg/L, about 12 grains per gallon	85 to 307 mg/L (5 to 18 grains)	GSWC 2026 CCR on 2025 data
Suburban Water Systems	We could not open a current report to confirm; use the report Suburban mails or posts for your system		Your annual CCR
Valencia Heights Water	We could not open a current report to confirm; ask the company for its latest CCR		Your annual CCR

What hard water does to east side plumbing

Tank water heaters collect scale and sediment at the bottom. You hear it as popping or rumbling when the burner runs.
Tankless heaters scale up inside the heat exchanger. In hard water, the maker's descaling schedule matters. Our tankless page explains the flush.
Faucet aerators and shower heads clog with white crust and lose flow.
Toilet fill valves stick, so the toilet runs. See toilets and faucets.

Hardness is not a health problem. Both the City of Covina and Golden State Water reported that their water met state and federal standards. Golden State also states that its system has no lead or galvanized service lines that require replacement, and the City reported the same for its system. Those statements cover the supplier's lines. Pipe inside your house is separate. Our water suppliers and hardness guide has the full tables for all six suppliers.

East Covina housing age and the pipe inside it

Most east Covina homes date from the postwar building boom, when Covina grew from 3,956 people in 1950 to 20,124 in 1960, so original pipe in many houses is now 60 to 75 years old.

Covina's population rose about 409% in the 1950s as citrus groves gave way to housing. The City's 2024 Housing Element says about two-thirds of Covina's homes were built before 1970, and about 58% are single-family detached houses. Charter Oak High School opened on E Covina Blvd in 1959, right at the end of that decade of growth on the east side.

The Housing Element also reports that City code enforcement estimates about 30% of homes need some repair and about 10% need major rehabilitation. Plumbing is often part of that list, because it is hidden until it fails.

Typical plumbing by era in east Covina homes (typical for the period, not a measured fact about any one house)
Home	Typical supply pipe	Typical drains and lateral	What we check first
1950s original	Galvanized steel, sometimes partly replaced with copper	Cast iron inside; clay lateral to the street	Water pressure at fixtures, rust at the heater, lateral camera
1960s original	Galvanized or early copper	Cast iron or early ABS; clay lateral	Supply pipe material at the main valve, lateral roots
Partly updated	Copper or PEX in remodeled rooms, galvanized elsewhere	Mixed	Where old and new pipe meet, which often leaks first
Fully repiped	PEX or copper	ABS inside; lateral often still original	The lateral, which remodels often skip

Galvanized pipe and low pressure

Galvanized steel rusts from the inside. The opening shrinks over decades until a shower that used to be strong turns weak, and the first water out of a tap after a trip comes out brown. When that happens in more than one room, patching a single fitting rarely fixes it. Our whole-house repiping page explains how a repipe is planned and permitted.

Angi's published range for a whole-house repipe is $1,500 to $15,000. That is a national estimate, not a quote. Call (626) 746-1970 for an exact quote.

Plumbing permits for City of Covina addresses in 91724

If your 91724 home is inside city limits, plumbing permits come from City of Covina Building and Safety at 125 E College St, in person, with no online portal.

Building and Safety is open Monday to Thursday, 7 a.m. to 6 p.m., closed from 1 to 2 p.m. Its phone is 626-384-5460. Handout #14 says a permit is required for plumbing work, most permits are issued over the counter while you wait, and no work may be covered up before it is inspected. Inspections are requested by email.

Confirm the address is in the City
Use the checks above. A county pocket address will be turned away at the City counter.
Pull the permit
Our contractors pull City permits when the work requires them. Most plumbing permits are issued the same day at the counter.
Do the work to code
For water heaters, that means Handout #12: two seismic straps in the upper and lower thirds, a relief drain to the outside, a gas shutoff, an approved flex connector, a sediment trap, an 18-inch stand in garages and a drain pan.
Leave it open for inspection
Nothing is closed up until the inspector signs off. The inspection request goes in by email.

Angi's published range for a tank water heater replacement is $600 to $2,500 (2025). Tankless installs run $1,404 to $3,901 (2026). Handout #12 upgrades can push a job toward the top of a range. Call (626) 746-1970 for an exact quote. Our Covina plumbing permit guide covers the counter process in more depth.

Sewer laterals on the east side: yours to maintain

For City of Covina homes, the property owner maintains the sewer lateral from the house to the public main, roots included.

City of Covina Public Works says the lateral is the owner's responsibility. The local mains in the street belong to the City. The big trunk sewers that carry flow away from Covina belong to the LA County Sanitation Districts, which announced a relining project of about 20,736 feet of trunk sewer in July 2024. None of that changes who fixes the pipe under your front yard: you do.

Homes in county pockets follow the same principle under County rules. LA County Public Works says laterals are entirely owned by the property they serve, for the whole length, including the part under the street. Our Charter Oak page has the County details.

Signs your lateral needs a camera

Two or more drains slow down at once.
A toilet gurgles when the washer drains.
Water comes up in the lowest tub or shower.
A cleanout cap in the yard is wet or has lifted.
A big tree stands between the house and the street.

Clear and monitor

Cable or hydro jet the line
Camera it and keep the video
Clean on a schedule before roots refill the pipe
Fits when the pipe is round and unbroken

Repair or replace

Spot repair one bad joint
Replace or line the run
Fits when the camera shows cracks, sags or many root points
Permit pulled from the right jurisdiction

Published estimates from Angi (2026) put a sewer camera inspection at $275 to $1,800 and hydro jetting at $350 to $600 per line. Sewer line replacement runs $1,388 to $5,323. HomeAdvisor (2025) lists main line clearing at $100 to $800. These are national ranges, not our prices. Call (626) 746-1970 for an exact quote. Our sewer lateral camera and repair page and sewer lateral guide go further.

Water rules and leak deadlines on the east side

If the City of Covina is your water supplier, its Level 2 shortage rules apply, including a 48-hour deadline to fix a leak after the City notifies you.

The City has been at Level 2 since August 4, 2022. These rules come from the City water page and Chapter 13.06 of the Covina Municipal Code, and they apply to City water customers. If Suburban, Golden State or Valencia Heights is on your bill, ask that company which conservation rules it follows.

City of Covina Water rules for City customers
Rule	What it says
Watering days, April to October	Wednesday and Saturday
Watering days, November to March	Wednesday only
Watering hours	Not between 9 a.m. and 5 p.m.; 10 minutes per station at most
Leak repair after City notice	48 hours at Level 2 (5 days normally)
Report water waste	626-384-5480

A 48-hour clock is short if the leak is under a slab or in a yard line. Do the EPA WaterSense meter test first: read the meter, use no water for two hours, and read it again. If it moved, you have a leak somewhere. WaterSense estimates household leaks can waste more than 9,300 gallons a year. Our leak detection team can find it, and our water rules guide explains every level.

Common plumbing calls in 91724

The calls we get most from east Covina are water heater replacements, root-blocked laterals, low pressure from old galvanized pipe and hard water scale.

Water heaters

Garage tanks past their 10 to 15 year life, replaced to Handout #12 in the City or to County rules in a pocket.

Lateral backups

Clay joints and mature trees. We clear, camera and show you the video.

Low pressure

Galvanized supply pipe closing up from the inside, usually worst at the far bathroom.

Scale

Crusted aerators, running toilets and noisy tanks from very hard water.

Hidden leaks

A meter that keeps turning, a warm floor or a wet patch in the yard.

Gas appliance lines

Old connectors at ranges, dryers and heaters. See our gas line plumber page.

HomeAdvisor's published range for clearing a single clog is $147 to $345 (2025). This Old House lists a typical Covina plumbing job at $102 to $339. Call (626) 746-1970 for an exact quote. For a backup that will not wait, our drain cleaning and 24/7 emergency plumber pages explain what happens when you call.

Buying a home in 91724: plumbing checks before you close

Before buying in east Covina, confirm the jurisdiction and the water supplier, camera the lateral and check what supply pipe the house still has.

Jurisdiction. City or county pocket, checked on the GIS viewer or EPIC-LA. It decides where permit history lives.
Water supplier. Ask the seller for a recent bill. It tells you hardness, rules and who to call at the meter.
Permit history. For City addresses, ask Building and Safety at 125 E College St about past water heater, repipe and sewer permits.
Sewer camera. The full lateral, with extra attention under any large tree.
Supply pipe. Look at the pipe at the water heater, under the kitchen sink and at the main valve. Gray threaded pipe is usually galvanized.
Water heater. Age from the label, two straps, relief drain to the outside and a drain pan.
Main shutoff. Make sure it turns. Original valves often stick.

Redfin put the 91724 median listing price at about $875K in November 2026. At that price, an hour of camera work and a meter test is a small part of the decision.

Who to call for water, sewer and gas problems in 91724

Problems inside your home and in your lateral are a plumber's job; problems at the meter go to the supplier on your bill, and public sewer spills go to the City or the County.

Who handles common problems for 91724 homes
Problem	Who handles it	Number
Backup inside the house or at your cleanout	A licensed plumber	(626) 746-1970
Leak at the meter or in the street	The water supplier on your bill	See the supplier table above
Public sewer problem, City address	City of Covina Public Works, 125 E College St	626-384-5220
Sewage spill, county pocket	LA County Public Works sewer maintenance	(800) 675-HELP
Gas smell	SoCalGas, called from outside	1-800-427-2200; 911 if there is danger
Downed power line	Call 911	911
Digging in the yard	Call 811 first	811, at least two business days ahead

Our who to call guide lists every agency. Work is performed by independent CSLB-licensed C-36 plumbing contractors, with a written price before work starts and an honest arrival window. If you are just across the line in a neighboring city, see our nearby cities page. For the blocks around City Hall and the Metrolink station, see Covina 91723.

Call (626) 746-1970 Request service

Questions Covina homeowners ask

Is 91724 in the City of Covina?

Partly. ZIP 91724 covers the east side of Covina and also unincorporated Charter Oak and some county pockets. The City says addresses above 2999, and homes south of the 10 Freeway and east of Grand Avenue, are likely County. Check the City GIS viewer or EPIC-LA to be sure.

Who is my water company in east Covina?

Look at your water bill. East Covina homes can be served by the City of Covina Water Division, Suburban Water Systems, Golden State Water or Valencia Heights Water Company. Two neighbors can have different suppliers, so the name on the bill is the only sure answer.

Where is the Suburban Water office in Covina?

The City of Covina lists Suburban Water Systems at 1325 N Grand Ave, Suite 100, Covina 91724, phone 626-543-2640. West Covina's utility page also lists a Suburban office at 2235 E Garvey Ave N with an after-hours leak line.

How hard is the water in Covina 91724?

It depends on your supplier, but it is hard. The City of Covina reported an average of about 13.5 grains per gallon in 2025, and Golden State Water's San Dimas system reported about 12 grains per gallon. See our hardness guide.

Where do I get a plumbing permit for a 91724 home?

If the address is in the City of Covina, go to Building and Safety at 125 E College St, open Monday to Thursday. Permits are issued in person, most over the counter. If the address is in a county pocket or Charter Oak, apply with LA County Public Works through EPIC-LA.

Who fixes the sewer pipe under my front yard in east Covina?

You do. The City of Covina says the property owner maintains the sewer lateral from the house to the public main, including tree roots. The County applies the same rule to county pocket homes. We camera, clear and repair laterals. Call (626) 746-1970.

What school district serves east Covina?

Charter Oak Unified serves the eastern portion of Covina, while Covina-Valley Unified serves most of the rest of the city. Charter Oak High School is at 1430 E Covina Blvd and opened in 1959.

Do the Covina watering days apply to me in 91724?

Only if the City of Covina is your water supplier. City customers water Wednesday and Saturday from April to October and Wednesday only from November to March. Customers of Suburban, Golden State or Valencia Heights should ask their own supplier.