San Jose Water
EPA ID: CA4310011 · 1,039,920 people served · 34 ZIP codes
ZipCheckup's reading of EPA SDWIS for San Jose Water (CA4310011): 1 past health-based violation, since resolved. 1 total violation across five years at San Jose Water - every finding closed, utility compliant today, 1,039,920 served.
Data: EPA SDWIS
Service Area Map
Coverage area for San Jose Water Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The San Jose Water serves a community with a median household income of $146,059 and an estimated 1,270,742 residents across its service area. Approximately 68% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
🌊 Where Does Your Water Come From?
San Jose Water'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
Detected Contaminants
How San Jose Water compares to EPA limits
What This Means For You
E. coli at 1 Zero tolerance (any positive sample triggers immediate action) exceeds the EPA maximum of Zero tolerance (any positive sample triggers immediate action). Severe GI illness; potentially fatal kidney failure in children. Consider UV disinfection (99.99%) filtration.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 70 detections recorded. 30 exceed federal EPA limits (4 ppt for PFOA/PFOS).
E. coli was detected in this water system. UV disinfection (99.99%) filtration can reduce exposure.
Find a certified water filter →Comparable Water Systems
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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
San Jose Water (EPA ID: CA4310011) is a community water system in California that serves approximately 1,039,920 people from surface water sources.
This system provides water to 34 ZIP codes across 8 communities.
Violation History
Status breakdown for accepted records with record years 2021-2026: 1 resolved, 0 archived, 0 addressed, and 0 unaddressed. Under this source contract, current noncompliance is the sum of addressed and unaddressed records. Archived and resolved records are excluded from current noncompliance.
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| June 1, 2023 | E. coli | Health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| E. coli | Microbiological | 1 | Yes |
Health Risk Details
E. coli (EPA limit: Zero tolerance (any positive sample triggers immediate action))
Severe GI illness; potentially fatal kidney failure in children At-risk groups: children under 5, elderly, immunocompromised individuals, pregnant women.
Removal methods: UV disinfection (99.99%), chlorination, reverse osmosis. Find the right filter →
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: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
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.
This system serves 34 ZIP codes:
95008 · 95014 · 95030 · 95032 · 95035 95050 · 95053 · 95070 · 95110 · 95111 95112 · 95113 · 95116 · 95117 · 95118 95119 · 95120 · 95121 · 95122 · 95123 95124 · 95125 · 95126 · 95127 · 95128 95129 · 95130 · 95131 · 95132 · 95133 95134 · 95136 · 95140 · 95148
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for San Jose Water (CA4310011) on EPA.gov.
Frequently Asked Questions
Is San Jose Water water safe to drink?
The accepted 2026Q2 ECHO snapshot shows no current noncompliance for San Jose Water; its 1 accepted 2021-2026 record are resolved or archived. Historical compliance status does not establish conditions at a specific tap.
How many people does San Jose Water serve?
San Jose Water serves approximately 1,039,920 people across 34 ZIP codes in California.
Where does San Jose Water get its water?
The primary water source is surface water.
Federal UCMR5 PFAS Monitoring: Detected
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). PFAS compounds were detected below the current state-enforceable MCL.
Current MCL reflects the lowest state-enforceable limit (NYS 10 ppt for PFOA/PFOS, effective August 2020). The federal final MCL of 4 ppt for PFOA/PFOS (EPA April 2024 rule) is not enforceable until April 2029. Detections above 4 ppt but below 10 ppt are below current MCL but above the future federal limit.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
How Water Systems Appear in Rankings
Water systems are evaluated by violation history, contaminant detections, and service population. Larger systems with more service connections appear in more rankings.
- #18 / 100 Highest Exposure Burden (U.S.)
- #1 / 50 Highest Exposure Burden (California)
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). San Jose Water (CA): 1 Health Violation. https://zipcheckup.com/water-system/ca4310011/
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title = {{San Jose Water (CA): 1 Health Violation}},
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url = {https://zipcheckup.com/water-system/ca4310011/}
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What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
San Jose Water (EPA ID: CA4310011) - request the latest Consumer Confidence Report or ask about specific contaminants.