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Descanso, CA Tap Water Quality 2026

Water quality report for Descanso, CA — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Descanso's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Descanso Community Water District PWSID: CA3710009 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead was not detected and no violations are open. PFAS has never been sampled at this system.

B

Descanso earns a B for water quality

Graded on violations and lead, with state inspection findings. PFAS not tested.

Lead: not detected
PFAS never sampled at this system
31 violations since 2015, 27 health-based
No violations currently open
Descanso's lead level vs. all California community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: Not detected — 0% of the federal action level
✓ Lower lead than % of California utilities
Population Served
1004
~315 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
31 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
0% of EPA action level
Not detected
Action level: 15 ppb
Lead was not detected at the 90th percentile — the result fell below the laboratory detection limit. That is not the same as an absence of lead in every tap, and older homes with lead service lines can still show higher readings.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Combined Uranium MCL EXCEEDANCE 20.7 PCI/L 30 ug/L 2025 Archived
Combined Uranium MONITORING AND REPORTING — 30 ug/L 2025 Archived
Combined Uranium MCL EXCEEDANCE 21.8 PCI/L 30 ug/L 2025 Archived
Combined Uranium MCL EXCEEDANCE 23.8 PCI/L 30 ug/L 2025 Archived
Combined Uranium MCL EXCEEDANCE 25.5 PCI/L 30 ug/L 2025 Archived
Combined Uranium MCL EXCEEDANCE 24.5 PCI/L 30 ug/L 2024 Archived
Combined Uranium MCL EXCEEDANCE 24.3 PCI/L 30 ug/L 2024 Archived
Combined Uranium MCL EXCEEDANCE 23.3 PCI/L 30 ug/L 2024 Archived
Combined Uranium MCL EXCEEDANCE 22.8 PCI/L 30 ug/L 2024 Archived
Combined Uranium MCL EXCEEDANCE 22.3 PCI/L 30 ug/L 2023 Archived
Combined Uranium MCL EXCEEDANCE 22 PCI/L 30 ug/L 2023 Archived
Combined Uranium MCL EXCEEDANCE 22 PCI/L 30 ug/L 2023 Archived
Combined Uranium MCL EXCEEDANCE 21.7 PCI/L 30 ug/L 2023 Archived
Combined Uranium MCL EXCEEDANCE 22.5 PCI/L 30 ug/L 2022 Archived
Combined Uranium MONITORING AND REPORTING — 30 ug/L 2022 Archived
Combined Uranium MCL EXCEEDANCE 21.5 PCI/L 30 ug/L 2022 Archived
Combined Uranium MCL EXCEEDANCE 20.8 PCI/L 30 ug/L 2022 Archived
Combined Uranium MONITORING AND REPORTING — 30 ug/L 2018 Archived
Combined Uranium MCL EXCEEDANCE 27 PCI/L 30 ug/L 2018 Resolved
Combined Uranium MCL EXCEEDANCE 25 PCI/L 30 ug/L 2017 Resolved
Combined Uranium MCL EXCEEDANCE 21 PCI/L 30 ug/L 2017 Resolved
Combined Uranium MCL EXCEEDANCE 23 PCI/L 30 ug/L 2017 Resolved
Combined Uranium MCL EXCEEDANCE 29 PCI/L 30 ug/L 2017 Resolved
Combined Uranium MONITORING AND REPORTING — 30 ug/L 2016 Archived
Combined Uranium MCL EXCEEDANCE 27 PCI/L 30 ug/L 2016 Resolved
Combined Uranium MCL EXCEEDANCE 22 PCI/L 30 ug/L 2016 Resolved
Combined Uranium MCL EXCEEDANCE 22 PCI/L 30 ug/L 2016 Resolved
Combined Uranium MCL EXCEEDANCE 24 PCI/L 30 ug/L 2015 Resolved
Combined Uranium MCL EXCEEDANCE 23 PCI/L 30 ug/L 2015 Resolved
Combined Uranium MCL EXCEEDANCE 24 PCI/L 30 ug/L 2015 Resolved
Combined Uranium MCL EXCEEDANCE 22 PCI/L 30 ug/L 2015 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

31 violations are on record since 2015, of which 27 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Descanso Community Water District
PWSID CA3710009
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 1,004
Service connections 315
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Descanso tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open.
Does Descanso water have PFAS? ▼
This system has never been sampled for PFAS. EPA's national monitoring covered systems serving 3,300 people or more, so no results exist — which is not evidence that none is present.
Who supplies water to Descanso? ▼
Descanso Community Water District (PWSID CA3710009). Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2019-07-10. No significant deficiencies were recorded.

What Should Descanso Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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