Treasure Island
EPA ID: CA3810702 · 3,864 people served · 2 ZIP codes
ZipCheckup's reading of EPA SDWIS for Treasure Island (CA3810702): a lead 90th-percentile reading above the EPA action level. Water monitoring history at Treasure Island shows a clean slate - EPA tracking over the past five years turned up no violations, and 3,864 residents continue to receive fully compliant service.
Data: EPA SDWIS
Service Area Map
Coverage area for Treasure Island Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Treasure Island serves a community with a median household income of $105,625 and an estimated 66,346 residents across its service area. Approximately 91% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
🌊 Where Does Your Water Come From?
Treasure Island'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 65th percentile nationally for proximity to Superfund (NPL) sites.
Infrastructure Risk
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 1 detection recorded.
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
Treasure Island (EPA ID: CA3810702) is a community water system in California that serves approximately 3,864 people from surface water sources.
This system provides water to 2 ZIP codes across 2 communities.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.1 mg/L | Yes | 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.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Treasure Island (CA3810702) on EPA.gov.
Frequently Asked Questions
Is Treasure Island water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Treasure Island 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 Treasure Island serve?
Treasure Island serves approximately 3,864 people across 2 ZIP codes in California.
Where does Treasure Island get its water?
The primary water source is surface water.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Treasure Island Water Quality Report, CA. https://zipcheckup.com/water-system/ca3810702/
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title = {{Treasure Island Water Quality Report, CA}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/ca3810702/}
}