Slocsa #10a - Cayucos
EPA ID: CA4010901 · 1,200 people served · 10 ZIP codes
Unlike many utilities its size, Slocsa #10a - Cayucos carries a violation-free five-year record — no EPA notices, no MCL exceedances, serving 1,200 people.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Worsening · Risk tier: High · 95% chance of violation in next 12 months
Violations went from 1 (2023) to 8 (2025). The pattern suggests growing compliance challenges.
Service Area Map
Coverage area for Slocsa #10a - Cayucos Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Slocsa #10a - Cayucos serves a community with a median household income of $89,259 and an estimated 78,525 residents across its service area. Approximately 70% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
🌊 Where Does Your Water Come From?
Slocsa #10a - Cayucos'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.
About 1% of homes in San Luis Obispo County, California rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Infrastructure Risk
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
Slocsa #10a - Cayucos (EPA ID: CA4010901) is a community water system in California that serves approximately 1,200 people from surface water sources.
This system provides water to 10 ZIP codes across 3 communities.
Violation History
Lead & Copper
No Lead and Copper Rule sampling data available for this water system.
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: 2 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 8 additional ZIPs inferred from SDWIS registry data. The EPA-confirmed set is the most reliable; SDWIS-inferred entries may be narrower than the real deployment area.
- 93401 — San Luis Obispo
- 93403 — San Luis Obispo
- 93405 — San Luis Obispo
- 93406 — San Luis Obispo
- 93407 — San Luis Obispo
- 93408 — San Luis Obispo
- 93409 — San Luis Obispo
- 93410 — San Luis Obispo
- 93430 — Cayucos
- 93442 — Morro Bay
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Slocsa #10a - Cayucos (CA4010901) on EPA.gov.
Frequently Asked Questions
Is Slocsa #10a - Cayucos water safe to drink?
Based on EPA records, Slocsa #10a - Cayucos has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Slocsa #10a - Cayucos serve?
Slocsa #10a - Cayucos serves approximately 1,200 people across 10 ZIP codes in California.
Where does Slocsa #10a - Cayucos get its water?
The primary water source is surface water.
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.