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Menlo Park, CA · Water Suppliers, Side Sewers and Permits · ZIPs 94025 and 94026
Emergency Plumber in Menlo Park, CA: Four Water Suppliers and Which One Serves Your Street
In Menlo Park the first plumbing question is often not what broke but who supplies the water to the street it broke on. Four suppliers serve the town, a sanitary district handles the sewer, and the owner owns the whole side sewer up to the main. This page sorts that out, adds the permit steps that catch people out, and explains what we do when a call comes from outside our verified list.
Outdoor leak in Menlo Park: which of four water suppliers owns it
Menlo Park addresses are served by four water providers. Menlo Park Municipal Water covers the Sharon Heights upper zone and the lower zone east of El Camino Real. California Water Service's Bear Gulch district serves Downtown and West Menlo. O'Connor Tract Co-Operative Water Company covers a small section of the Willows, and Palo Alto Park Mutual Water Company serves a handful of addresses on Menalto Avenue.
The City publishes a water providers map where you type an address and see the supplier. Use it before you call anyone about water at the curb or the meter box, because the right number depends on the answer.
- Menlo Park Municipal Water: (650) 330-6750, with after-hours service at (650) 330-6300.
- Cal Water, Bear Gulch district office: (650) 561-9709.
- A wet curb or meter box points to the supplier's side of the line, while water inside the walls is the owner's problem.
- Close your main shut-off first, whatever the answer turns out to be.
Water running now? Call and keep looking for the shut-off while we talk.
Call (833) 840-2034West Bay Sanitary District and the side sewer you own
West Bay Sanitary District handles sewers here, and its code makes the side sewer from the district main to the property solely the owner's. The district clears the public main, and only the district may do that. It may clear the line from the property-line cleanout to the main as a courtesy, if the lateral and cleanout meet its requirements, but that is not guaranteed.
The district's code asks for a cleanout within five feet of the property line. Without one, the district recommends installing one, and that work needs a district permit.
| Method | Permit class | Worth knowing |
|---|---|---|
| Trenchless: pipe bursting or cured-in-place lining | Class 1F residential | Not allowed where the lateral is under 36 inches deep at the property line |
| Open trench | Class 1A residential | The district inspects the depth before the permit, by appointment |
| Either method | Notice for inspection | 24 hours' notice for Class 1 and 2 permits |
A lined or burst lateral does not get the district's courtesy cleaning afterwards, and the owner signs a recorded addendum saying so. That is worth knowing before choosing a trenchless approach over digging.
The district can also require an overflow-prevention device on a side sewer, fitted between the building and the property-line cleanout at the owner's cost, and it recommends one to prevent building flooding. Its office is at 500 Laurel Street, and the line is (650) 321-0384.
Replacing a water heater in Menlo Park: the permit and the panel question
The City's Building office, at 701 Laurel Street, requires a permit for a water heater replacement, and the application goes through its online portal with no paper form. A gas-to-gas swap needs the permit application, the product specifications and a signed energy compliance form, but no plans.
Moving from gas to a heat pump water heater adds a lot plan. It must show equipment locations, distances to the property lines, the panel location, the receptacle location and the circuit amperage, and the owner signs a covered-parking encroachment acknowledgment.
- Check the panel first. A heat pump unit needs electrical capacity, and the permit asks for the circuit amperage.
- Pick the spot. The unit may need more ventilation than a gas tank, and the lot plan fixes where it goes.
- Submit through the portal. The Building office answers permit questions at (650) 330-6704.
The City's building electrification page may list rebates for a heat pump replacement. Check it before you buy.
Chloramine in the water: what both main suppliers report
Both Menlo Park Municipal Water and Cal Water's Bear Gulch district disinfect with chloramine, not plain chlorine, according to their 2024 reports. Menlo Park Municipal Water buys its supply from the San Francisco Regional Water System and reports hardness from 8.4 to 106 mg/L, an average of 57, which is soft to moderately hard.
We are not printing a pH figure for the city system, because the printed table in its 2024 report shows a value that cannot be right for drinking water. Call the water department at (650) 330-6750 if the number matters for a filter or a heater warranty.
A homeowner with an aquarium or a home dialysis machine needs treatment rated for chloramine. For everyone else the practical point is to ask which supplier you have before anyone sells you a softener.
Flood maps, flood insurance and a low-level floor drain
Menlo Park's flood maps were last updated October 16, 2012, and the City's community rating gives owners in the mapped hazard zones a ten percent premium reduction, with five percent in the lower-risk zone. A home in a mapped hazard area with a federally backed mortgage must carry flood insurance.
Check your address against the FEMA flood map before a purchase or a project. An elevation certificate can lower premiums, and the City's Floodplain Manager answers at (650) 330-6740. If a floor drain or a low bathroom sits below the street, ask your plumber about a backwater valve as well.
Roots in the side sewer and slower drains: Menlo Park symptoms
| The symptom | Read this page |
|---|---|
| Kitchen or tub draining slower each month | Clearing a slow drain |
| Roots reaching the side sewer | Repairing the side sewer |
| Damp patch outdoors, or a bill that crept up | Finding a hidden leak |
| Shower runs cold, or the tank base is wet | Fixing the water heater |
| Wet floor after sewage came back up | Drying out the room |
How a call from Menlo Park is handled
Menlo Park's ZIP codes, 94025 and 94026, are not on our verified list, so the town is not shown as covered, although it borders East Palo Alto. Proximity alone settles nothing.
Ring with the street address. A plumber is sent only if the address qualifies, and otherwise you hear that at the start.
Not sure we reach your street in Menlo Park? Call and ask.
Call (833) 840-2034Who supplies the water and who approves lateral work in Menlo Park
Do you serve Menlo Park?
Menlo Park's ZIP codes, 94025 and 94026, are not on our verified list, so Menlo Park is not described as covered. Ring with an address and we say whether a visit is possible.
Who supplies my water in Menlo Park?
It depends on the address. Menlo Park Municipal Water, Cal Water's Bear Gulch district, O'Connor Tract Co-Operative and Palo Alto Park Mutual all serve parts of town. The City's water providers map shows yours.
Who owns the sewer lateral at a Menlo Park house?
The owner. West Bay Sanitary District's code makes the side sewer from the district main to the property the owner's responsibility. The district clears the public main only.
Does a water heater replacement in Menlo Park need a permit?
Yes. The Building office requires a permit and takes applications through its online portal. A switch from gas to a heat pump adds a lot plan with the panel and circuit details.
Does West Bay Sanitary District need to approve lateral work?
Yes. A district permit is required before anyone uncovers or alters the public connection, and the district asks for notice before inspection. Trenchless work is Class 1F and open trench is Class 1A.
Close to East Palo Alto in Menlo Park? Ask about a visit
Give the street address when you ring. You will hear straight away if a visit is possible, and no work starts before a written range.