Plumbing in San Jose
Sizing a softener or a water heater in San Jose starts with a question for your water company. Most of the city is served by San Jose Water (SJW), whose 2025 Annual Water Quality Report blends local groundwater, local surface water and imported surface water bought from Valley Water. Hardness differs a lot by source. In SJW's 2024 report, groundwater averages 21 grains per gallon, against 9 for mountain surface water and 7 for the Valley Water supply.
Call SJW at (408) 279-7900 and ask which source reaches your address. Three in five San Jose homes, 60.8% in ACS 2023 five-year data, were built before 1980. SJW's report says it has finished its initial Lead Service Line Inventory and posted it online. Own an older house? Look your address up there. The Building Division, which issues San Jose's permits, says some permits bought online at SJPermits.org cost half the regular fee.
Swapping out a water heater needs a plumbing permit, which a single family home or duplex gets online at SJPermits.org. Its FY2024-25 schedule sets the online issuance charge for that job at $0, while inspection time is listed at $315 an hour. Every heater must also be strapped, two straps for tanks up to 52 gallons. For a single family home or duplex project at City Hall, the Permit Center sees people by appointment at 408-535-3555. Before you agree to a price, have the company tell you what it expects the permit to cost and whether it'll file online.
What plumbing costs near San Jose
No plumber has quoted us a job in San Jose, so this page has no city price. The California page sets the estimates beside what plumbers are paid ($39.58 an hour in the BLS wage data, which is pay, not price). How we estimate costs.
Permits for plumbing work in San Jose
Check with the City of San Jose building department which office issues plumbing permits for your address. State Water Board OWTS program (septic policy, local agency contacts)
Work that replaces or alters piping, a water heater swap or a sewer repair for example, generally needs a permit.