Halcyon Water System
EPA ID: CA4000501 · 110 people served · 1 ZIP code
ZipCheckup's reading of EPA SDWIS for Halcyon Water System (CA4000501): 2 unresolved EPA violations on record. Looking at the EPA enforcement file for Halcyon Water System, 2 violations are listed as unresolved - those findings cover the utility's service area of approximately 110 people and remain open in the federal compliance system, awaiting formal corrective action documentation.
Data: EPA SDWIS
Service Area Map
Coverage area for Halcyon Water System Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Halcyon Water System serves a community with a median household income of $75,012 and an estimated 6,812 residents across its service area. Approximately 65% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Halcyon Water System's water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
Infrastructure Risk
Detected Contaminants
How Halcyon Water System compares to EPA limits
What This Means For You
Lead at 13 mg/L (action level) exceeds the EPA maximum of 0.015 mg/L (action level). Brain damage in children, kidney & blood pressure in adults. Consider reverse osmosis filtration.
Contaminant 1045 at 7 mg/L exceeds the EPA maximum of mg/L.
Stage 2 DBP Rule at 2 mg/L exceeds the EPA maximum of mg/L.
Lead was detected in this water system. reverse osmosis 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
Halcyon Water System (EPA ID: CA4000501) is a community water system in California that serves approximately 110 people from groundwater sources.
This system serves ZIP code 93445 in Oceano.
Violation History
Status breakdown for accepted records with record years 2021-2026: 1 resolved, 19 archived, 0 addressed, and 2 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 |
|---|---|---|---|
| January 1, 2026 | Contaminant 1045 | Non-health-based | Archived |
| October 1, 2025 | Contaminant 1045 | Non-health-based | Archived |
| July 1, 2025 | Contaminant 1045 | Non-health-based | Archived |
| January 1, 2025 | Contaminant 1045 | Non-health-based | Archived |
| October 17, 2024 | Stage 2 DBP Rule | Health-based | Unaddressed (current) |
| October 17, 2024 | Stage 2 DBP Rule | Non-health-based | Unaddressed (current) |
| October 1, 2024 | Contaminant 1045 | Non-health-based | Archived |
| July 1, 2024 | Contaminant 1045 | Non-health-based | Archived |
| April 1, 2024 | Contaminant 1045 | Non-health-based | Archived |
| January 1, 2024 | Lead | Non-health-based | Resolved |
| July 1, 2023 | Lead | Non-health-based | Archived |
| April 1, 2023 | Lead | Non-health-based | Archived |
| January 1, 2023 | Lead | Non-health-based | Archived |
| January 1, 2023 | Lead | Non-health-based | Archived |
| October 1, 2022 | Lead | Non-health-based | Archived |
| October 1, 2022 | Lead | Non-health-based | Archived |
| July 1, 2022 | Lead | Non-health-based | Archived |
| January 1, 2022 | Lead | Non-health-based | Archived |
| October 1, 2021 | Lead | Non-health-based | Archived |
| July 1, 2021 | Lead | Non-health-based | Archived |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Lead | Inorganic | 13 | No |
| Contaminant 1045 | Other Violation | 7 | No |
| Stage 2 DBP Rule | Treatment Failure | 2 | Yes |
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.
- 93445 - Oceano
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Halcyon Water System (CA4000501) on EPA.gov.
Frequently Asked Questions
Is Halcyon Water System water safe to drink?
The accepted 2026Q2 ECHO snapshot shows 1 current health-based noncompliance record for Halcyon Water System. Review the utility's current notices and EPA record. This system-level compliance history cannot determine conditions at a specific tap.
How many people does Halcyon Water System serve?
Halcyon Water System serves approximately 110 people across 1 ZIP code in California.
Where does Halcyon Water System get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Halcyon Water System (CA): 1 Health Violation. https://zipcheckup.com/water-system/ca4000501/
@misc{zipcheckup-water-system-ca4000501,
author = {{ZipCheckup}},
title = {{Halcyon Water System (CA): 1 Health Violation}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/ca4000501/}
}
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
Halcyon Water System (EPA ID: CA4000501) - request the latest Consumer Confidence Report or ask about specific contaminants.