Short answer: for a leaking water heater in Rowland Heights, shut the cold-water valve on the heater and call a plumber. Because Rowland Heights is unincorporated, replacement permits go through Los Angeles County Public Works Building and Safety. Our leaking water heater in Diamond Bar page explains the emergency steps, which are the same here.
Why Rowland Heights is different
Rowland Heights is not a city. Los Angeles County’s annual report on the community lists it as an unincorporated area, covering about 18.9 square miles and roughly 47,800 residents. That has practical consequences: permits, inspections and code questions go to the county, not a municipal building department, and county staff may be working from a field office rather than a city hall.
| Topic | What we found | Where to check |
|---|---|---|
| Permits and inspections | Los Angeles County Public Works Building and Safety. The county report names the La Puente One-Stop Center, 16005 E. Central Ave., La Puente, (626) 574-0941, as the local field office. | LA County Public Works. Confirm current location and hours before you go. |
| Housing mix | About 77 percent of housing units are single-family and about 19 percent are in buildings of five or more units (LA County Planning data sheet). | County planning data |
| Water supply | Walnut Valley Water District serves the easterly part of the community. Other districts serve other areas, which we could not verify street by street. | Your water bill |
| Hardness (WVWD 2025) | About 234 mg/L for Weymouth supply and 97 mg/L for Miramar supply in the district’s report | The district’s Consumer Confidence Report |
| Gas | SoCalGas lists Rowland Heights among communities it serves | Your gas bill |
| ZIP code | 91748 appears on most local county facilities | USPS lookup |
Houses, condos and apartments: who owns the water heater?
With roughly one in five units in larger multi-unit buildings, a leaking water heater in Rowland Heights can be a different problem depending on where you live. In a single-family home, it is yours. In a condo, find out whether the heater is inside your unit, or serves a building system that the HOA manages. In a rental, report the leak to the landlord in writing and keep photos, since hot water is generally part of a rental’s habitability requirements.
In every case the first steps are the same: close the cold-water supply to the heater or the building’s shutoff, keep clear of electrical hazards, and, if gas is involved, leave and call. Our emergency leak checklist walks through them.
Permits for a replacement in Rowland Heights
A replacement here normally involves a permit through Los Angeles County Public Works Building and Safety, plus earthquake bracing as the state requires. Ask the plumber whether they pull county permits and who is present for the inspection. For what a compliant installation covers, see water heater replacement.
Hard water and what it does to heaters
Where Walnut Valley Water District supplies the water, the district’s own report shows hardness well above the 180 mg/L the USGS treats as very hard for part of its supply. Heaters in hard-water homes tend to show scale on connectors, shortened anode rod life and sediment noise. If your leak is at the top of the tank, see flex line and valve leaks, and if it is below, tank corrosion.
Need a plumber for this? Tell the plumber that you are in unincorporated Rowland Heights so they can plan for county permits.
Call +1 (909) 760-1466Nearby
Rowland Heights borders Walnut, where permits go through the city, and Diamond Bar, which is the focus of our local Diamond Bar plumber guide. The same safety steps apply on both sides of the boundary.
Frequently asked questions
Who issues water heater permits in Rowland Heights?
Los Angeles County Public Works Building and Safety, because Rowland Heights is unincorporated. The county’s report lists a field office in La Puente. Confirm the current location and hours.
Does Rowland Heights have its own city water department?
No. As an unincorporated community, it is served by water districts and companies. Walnut Valley Water District serves part of it, so check your bill for your supplier.
My water heater is in a condo. Who fixes the leak?
It depends on your governing documents. If the heater serves only your unit, it is usually your responsibility. If it is part of a shared system, notify the HOA or property manager immediately.
Do you cover Rowland Heights?
Coverage depends on the independent plumber who accepts the call. Give your street address when you call and they will confirm whether they serve it.
Sources and further reading
- LA County: Rowland Heights unincorporated area report, FY 2023-24
- LA County Planning: Rowland Heights data sheet
- LA County Public Works: Building and Safety
- Walnut Valley Water District: service area
- Walnut Valley Water District: 2025 Consumer Confidence Report
- USGS Water Science School: Hardness of water
Related guides
- Replacing a leaking water heaterWhen a leak means replacement, what a California-compliant installation includes, and how permits and bracing fit in.
- Emergency water heater leak repairWhat to do in the first ten minutes, how to find where the water is really coming from, and when to call right away.
- Leaking from the bottom: tank corrosionHow tanks wear out, what the anode rod does, and how to tell a failing tank from a fitting leak or condensation.