Santa Clara County, CA · PWSID CA4310011
San Jose Water lead service lines
No lead lines reported
San Jose Water reported 236,341 service lines and no lead, galvanized-requiring-replacement or unknown lines. That's good news for the service line. Older homes can still have lead solder or brass fixtures inside, so testing is the only sure check.
0% of San Jose Water's service lines are lead or galvanized requiring replacement. That's lower than the California average (0.1%) and lower than the national average (3.1%).
- Lead 0%
- Galvanized (replace) 0%
- Unknown 0%
- Non-lead 100%
Total service lines reported: 236,341. Reported all required service line types. Population served: 1,039,920; 232,926 connections.
Lead test results
San Jose Water's most recent 90th-percentile lead result (Jan 2023–Dec 2025) was not detected, below both the 15 ppb action level and the 10 ppb level that takes effect in 2027. This means 90% of homes sampled were at or below that level; individual homes, especially those with lead lines, can be higher.
Lead and Copper Rule 90th-percentile results reported to EPA, in parts per billion. Dashed lines: 15 ppb action level and the 10 ppb level from November 1, 2027.
Lead rule violations
EPA's data lists no Lead and Copper Rule violations for San Jose Water since 2015. That covers testing, reporting, corrosion control and public notice requirements; it isn't a guarantee about any individual home.
Source: EPA SDWIS violation records for the Lead and Copper Rule.
Where the water comes from
San Jose Water's main water source is surface water (rivers, lakes or reservoirs). It buys treated water from Santa Clara Valley Water District, City of Cupertino. The seller treats the water, including corrosion control that keeps lead from dissolving out of pipes, while San Jose Water is responsible for its own service line inventory and replacement program. It sells water to 18 other water systems: Mountain Springs Mutual Water Company, City of Cupertino, Great Oaks WC INC, Chemeketa Park Mutual Water Company, Kennon Water Company, Oakmont Water System, Saratoga Heights Mutual Water Company, Vista Grande Water Users Association, Roseview Heights Mutual Water Company, Mt. Pleasant Water Users Association, Mireval Improvement Association, Maria Lane Mutual Water Company, Mt. Eden Mutual Water Company, Brush and Old Well Mutual Water Company, Big Redwood Park Water, Villa del Monte MWC, Summit West Mutual Water Co., Ridge Mutual Water Company.
Source: EPA SDWIS water system and facility records.
Check your own address
These counts cover the whole system. To see whether your line is lead, use the utility's address-level inventory. Utilities had to prepare one by October 16, 2024 and make it publicly accessible; systems serving more than 50,000 people must post it online.
No map yet? Do the 2-minute scratch and magnet test on the pipe where water enters your home.
Protect your drinking water now
If your line is lead, galvanized or unknown, filter water for drinking, cooking and baby formula. Use a filter certified to NSF/ANSI 53 for lead. Run cold water for a few minutes after it sits for hours, and never use hot tap water for cooking.
How to pick a lead-certified filter · How to test your water for lead
Getting the line replaced
EPA's Lead and Copper Rule Improvements require most systems to replace lead and galvanized-requiring-replacement lines by December 31, 2037. Ask San Jose Water whether it replaces the private side for free or with a cost share before you hire anyone. If you want it done sooner, or your utility doesn't cover your side, a licensed plumber can quote it. What replacement costs.
County pages: Lead pipes in Santa Clara County
Cities served
ZIP codes served
ZIP codes whose center falls inside San Jose Water's mapped service area (EPA service area boundaries). Neighboring utilities may serve parts of the same ZIP.
950089503095070951109511195112951139511695117951189512295123951249512595126951289512995130951319513395136
Other water systems nearby
Check another water system
Questions
Does San Jose Water have lead pipes?
San Jose Water reported no lead, galvanized-requiring-replacement or unknown service lines among 236,341 lines.
How do I check if my home's service line is lead?
Look up your address on San Jose Water's official service line inventory, which utilities must make publicly available. You can also scratch the pipe where it enters your home: lead is soft, dull gray, scratches to shiny silver and does not attract a magnet.
When will San Jose Water replace lead service lines?
Under EPA's Lead and Copper Rule Improvements, most systems must replace lead and galvanized-requiring-replacement lines by December 31, 2037, starting from November 1, 2027. The rule is being challenged in court, so dates could change. Many utilities run free or cost-share programs now.
Has San Jose Water had lead violations?
EPA's data shows no Lead and Copper Rule violations since 2015 for San Jose Water.
Which water filters remove lead?
Use a filter certified to NSF/ANSI Standard 53 for lead reduction, or NSF/ANSI 58 for reverse osmosis. Check the certification on NSF's listings, not just the box.
Embed or cite this data
Local news sites, blogs and community groups can embed this card. It updates when EPA releases new data.
Citation: Lead Pipe Map, "San Jose Water lead service lines," https://leadpipemap.com/ca/san-jose-water/. Source: EPA SDWIS service line inventory, 2026 Q3. Download the full dataset on the data page.