Rincon Del Diablo Mwd (id-1)
EPA ID: CA3710018 · 30,757 people served · 6 ZIP codes
ZipCheckup's reading of EPA records for Rincon Del Diablo Mwd (id-1) (CA3710018): no drinking-water violations recorded since 2021. Zero violations are listed in EPA monitoring data for Rincon Del Diablo Mwd (id-1); a count of records like this is not a water-quality test for the 30,757 residents it serves.
Data: EPA SDWIS
Service Area Map
Coverage area for Rincon Del Diablo Mwd (id-1) Source: EPA SDWIS service area boundaries.
Service area boundary - average Home Safety grade of mapped ZIPs: A
Demographics of ZIP Codes Served
The ZIP codes associated with Rincon Del Diablo Mwd (id-1) have a median household income of $97,301 and about 223,750 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 53% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
🌊 Where Does Your Water Come From?
Rincon Del Diablo Mwd (id-1)'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 in ZIP Codes This System Serves
PFAS ("forever chemicals") have been reported in samples from water systems associated with the ZIP codes in this system's area. These results can come from other water systems serving the same ZIP codes; check the UCMR5 section for any results reported for this system. 3 detections 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
Rincon Del Diablo Mwd (id-1) (EPA ID: CA3710018) is a community water system in California that serves approximately 30,757 people from surface water sources.
This system provides water to 6 ZIP codes across 2 communities.
ZIP-Area Home Safety Context: A (90/100)
This is the average Home Safety Score for 1 of 6 service-area ZIP codes with all required score domains observed. It is not a grade for the water utility.
Model 4.0.0 uses SDWIS identity plus accepted ECHO SDWA lifecycle-based water compliance, the UCMR 5 PFAS MCL screen, EPA radon zone, and annual EPA AirData AQI across three equally weighted domains. Missing required evidence suppresses the score.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| Below the reporting limit | No | 2025-12-31 |
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
6 of 6 ZIP records with known zones are in EPA Radon Zone 3.
The EPA recommends testing all homes regardless of radon zone. County radon zones cannot replace an in-home radon test.
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.
- 92025 - Escondido
- 92026 - Escondido
- 92029 - Escondido
- 92069 - San Marcos
- 92078 - San Marcos
- 92096 - San Marcos
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Rincon Del Diablo Mwd (id-1) (CA3710018) on EPA.gov.
Frequently Asked Questions
Is Rincon Del Diablo Mwd (id-1) water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Rincon Del Diablo Mwd (id-1) 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 Rincon Del Diablo Mwd (id-1) serve?
Rincon Del Diablo Mwd (id-1) serves approximately 30,757 people across 6 ZIP codes in California.
Where does Rincon Del Diablo Mwd (id-1) 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; the table compares each one with the EPA MCL where one exists (April 2024 rule, compliance required from 2029) and with this state's enforceable standard where one exists.
EPA's April 2024 PFAS rule sets MCLs of 4 ppt for PFOA and PFOS and 10 ppt for PFHxS, PFNA and HFPO-DA (GenX); water systems must comply from 2029. Other PFAS compounds have no individual federal MCL. A state standard is shown only where this system's state has its own enforceable PFAS limit. Detection results are EPA UCMR5 samples, not a measurement at your tap.
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.). Rincon Del Diablo Mwd (id-1), CA: Serves 31K People. https://zipcheckup.com/water-system/ca3710018/
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