Carlsbad Mwd
EPA ID: CA3710005 · 95,158 people served · 8 ZIP codes
ZipCheckup's reading of EPA SDWIS for Carlsbad Mwd (CA3710005): no EPA violations recorded in the last five years. Compared to the national average for mid-size utilities, Carlsbad Mwd sits well above the baseline - five years of EPA monitoring show no violations, no MCL exceedances, and no enforcement actions for the full service territory of 95,158 people.
Data: EPA SDWIS
Service Area Map
Coverage area for Carlsbad Mwd Source: EPA SDWIS service area boundaries.
Service area boundary - Grade A
Service Area Demographics
The Carlsbad Mwd serves a community with a median household income of $110,138 and an estimated 288,449 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?
Carlsbad Mwd'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
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
Carlsbad Mwd (EPA ID: CA3710005) is a community water system in California that serves approximately 95,158 people from surface water sources.
This system provides water to 8 ZIP codes across 4 communities.
ZIP-Area Home Safety Context: A (92/100)
This is the average Home Safety Score for 3 of 8 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 |
|---|---|---|
| 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.
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 3 (Low Risk)
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.
- 92008 - Carlsbad
- 92009 - Carlsbad
- 92010 - Carlsbad
- 92011 - Carlsbad
- 92054 - Oceanside
- 92056 - Oceanside
- 92078 - San Marcos
- 92081 - Vista
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Carlsbad Mwd (CA3710005) on EPA.gov.
Frequently Asked Questions
Is Carlsbad Mwd water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Carlsbad Mwd 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 Carlsbad Mwd serve?
Carlsbad Mwd serves approximately 95,158 people across 8 ZIP codes in California.
Where does Carlsbad Mwd get its water?
The primary water source is surface water.
Federal UCMR5 PFAS Monitoring: Tested Clean
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). No PFAS compounds were detected.
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.). Carlsbad Mwd, CA: Serves 95K People. https://zipcheckup.com/water-system/ca3710005/
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url = {https://zipcheckup.com/water-system/ca3710005/}
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