City of San Jose - Nsj/alviso
EPA ID: CA4310019 · 45,559 people served · 6 ZIP codes
ZipCheckup's reading of EPA records for City of San Jose - Nsj/alviso (CA4310019): no drinking-water violations recorded since 2021. Zero violations are listed in EPA monitoring data for City of San Jose - Nsj/alviso; a count of records like this is not a water-quality test for the 45,559 residents it serves.
Data: EPA SDWIS
Service Area Map
Coverage area for City of San Jose - Nsj/alviso Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with City of San Jose - Nsj/alviso have a median household income of $161,927 and about 221,098 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 44% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
🌊 Where Does Your Water Come From?
City of San Jose - Nsj/alviso's water is drawn from rivers, lakes, or reservoirs. Surface water sources are more exposed to agricultural runoff, stormwater, and upstream discharges, but they typically receive more intensive treatment before reaching your tap.
Superfund Proximity Note: This service area ranks in the 80th percentile nationally for proximity to Superfund (NPL) sites.
Infrastructure Risk
PFAS in ZIP Codes This System Serves
PFAS ("forever chemicals") have been reported in samples from water systems associated with the ZIP codes in this system's area. These results can come from other water systems serving the same ZIP codes; check the UCMR5 section for any results reported for this system. 4 detections recorded. 2 detections are above the level of a federal PFAS MCL (4 ppt for PFOA and PFOS), with compliance required from 2029.
Comparable Water Systems
Similar-sized systems in California
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
City of San Jose - Nsj/alviso (EPA ID: CA4310019) is a community water system in California that serves approximately 45,559 people from surface water sources.
This system provides water to 6 ZIP codes across 4 communities.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0 mg/L | No | N/A |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Ask your water utility whether running cold water for 2 minutes is enough to flush your plumbing before drinking.
ZIP Codes Served
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by CA or modeled from parcel and building-footprint data.
- 94089 - Sunnyvale
- 95002 - Alviso
- 95035 - Milpitas
- 95112 - San Jose
- 95131 - San Jose
- 95134 - San Jose
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for City of San Jose - Nsj/alviso (CA4310019) on EPA.gov.
Frequently Asked Questions
Is City of San Jose - Nsj/alviso water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for City of San Jose - Nsj/alviso in the inclusive 2021-2026 record-year window. This is a compliance-record finding, not a guarantee about water at a specific tap.
How many people does City of San Jose - Nsj/alviso serve?
City of San Jose - Nsj/alviso serves approximately 45,559 people across 6 ZIP codes in California.
Where does City of San Jose - Nsj/alviso get its water?
The primary water source is surface water.
Federal UCMR5 PFAS Monitoring: No PFAS Reported Above Reporting Levels
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). No PFAS compounds were reported above UCMR5 minimum reporting levels.
EPA's April 2024 PFAS rule sets MCLs of 4 ppt for PFOA and PFOS and 10 ppt for PFHxS, PFNA and HFPO-DA (GenX); water systems must comply from 2029. Other PFAS compounds have no individual federal MCL. A state standard is shown only where this system's state has its own enforceable PFAS limit. Detection results are EPA UCMR5 samples, not a measurement at your tap.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). City of San Jose - Nsj/alviso, CA: Serves 46K People. https://zipcheckup.com/water-system/ca4310019/
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