Slo Cwwd No. 23 - Santa Margarita
EPA ID: CA4010024 · 1,291 people served · 8 ZIP codes
Even as other utilities in the region logged violations, Slo Cwwd No. 23 - Santa Margarita kept a clean EPA record — five years, no issues, 1,291 people served.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Slo Cwwd No. 23 - Santa Margarita Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Slo Cwwd No. 23 - Santa Margarita serves a community with a median household income of $73,934 and an estimated 63,932 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?
Slo Cwwd No. 23 - Santa Margarita'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.
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
Slo Cwwd No. 23 - Santa Margarita (EPA ID: CA4010024) is a community water system in California that serves approximately 1,291 people from groundwater sources.
This system provides water to 8 ZIP codes across 1 community.
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
- 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
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Slo Cwwd No. 23 - Santa Margarita (CA4010024) on EPA.gov.
Frequently Asked Questions
Is Slo Cwwd No. 23 - Santa Margarita water safe to drink?
Based on EPA records, Slo Cwwd No. 23 - Santa Margarita has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Slo Cwwd No. 23 - Santa Margarita serve?
Slo Cwwd No. 23 - Santa Margarita serves approximately 1,291 people across 8 ZIP codes in California.
Where does Slo Cwwd No. 23 - Santa Margarita get its water?
The primary water source is groundwater.
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.