Sunnyslope County Water District
EPA ID: CA3510003 · 24,954 people served · 1 ZIP code
ZipCheckup's reading of EPA SDWIS for Sunnyslope County Water District (CA3510003): no EPA violations recorded in the last five years. In the most recent five-year monitoring window, Sunnyslope County Water District posted zero EPA violations serving 24,954 residents.
Data: EPA SDWIS
Service Area Map
Coverage area for Sunnyslope County Water District Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Sunnyslope County Water District serves a community with a median household income of $108,156 and an estimated 58,374 residents across its service area. Approximately 47% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
🌊 Where Does Your Water Come From?
Sunnyslope County Water District'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.
Infrastructure Risk
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 1 detection recorded. 1 exceeds federal EPA limits (4 ppt for PFOA/PFOS).
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
Sunnyslope County Water District (EPA ID: CA3510003) is a community water system in California that serves approximately 24,954 people from surface water sources.
This system serves ZIP code 95023 in Hollister.
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.
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.
- 95023 - Hollister
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Sunnyslope County Water District (CA3510003) on EPA.gov.
Frequently Asked Questions
Is Sunnyslope County Water District water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Sunnyslope County Water District 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 Sunnyslope County Water District serve?
Sunnyslope County Water District serves approximately 24,954 people across 1 ZIP code in California.
Where does Sunnyslope County Water District 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 →
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Sunnyslope County Water District, CA: Serves 25K People. https://zipcheckup.com/water-system/ca3510003/
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