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San Diego, TX Tap Water Quality 2026

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

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

Main Utility: San Diego Mud 1 PWSID: TX0660003 Updated: 2026 Q2
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1 violation currently open

Lead was not detected. PFAS was sampled but not enough times for a compliance determination.

D

San Diego earns a D for water quality

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

Lead: not detected
PFAS sampled, too few results to judge
13 violations since 2015, 5 health-based
1 violation currently open
San Diego's lead level vs. all Texas community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: Not detected — 0% of the federal action level
✓ Lower lead than % of Texas utilities
Population Served
3740
~2658 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
1
1 open of 13 since 2015

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
Public Notice OTHER — — 2026 Unaddressed
Consumer Confidence Rule OTHER — — 2025 Unaddressed
Public Notice OTHER — — 2025 Unaddressed
LEAD AND COPPER RULE REVISIONS TREATMENT TECHNIQUE — — 2024 Unaddressed
LEAD AND COPPER RULE REVISIONS REPORTING FAILURE — — 2024 Unaddressed
Public Notice OTHER — — 2024 Resolved
Arsenic MCL EXCEEDANCE 0.011 MG/L 0.010 mg/L 2024 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2024 Resolved
Arsenic MCL EXCEEDANCE 0.013 MG/L 0.010 mg/L 2024 Resolved
Arsenic MCL EXCEEDANCE 0.011 MG/L 0.010 mg/L 2024 Resolved
Arsenic MCL EXCEEDANCE 0.013 MG/L 0.010 mg/L 2023 Resolved
Consumer Confidence Rule OTHER — — 2018 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2016 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

1 violation remains open, out of 13 recorded since 2015 (5 health-based).

About the Main Water System

Utility San Diego Mud 1
PWSID TX0660003
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 3,740
Service connections 2,658
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is San Diego tap water safe to drink? ▼
No federal limit is exceeded on record. 1 violation(s) remain open.
Does San Diego water have PFAS? ▼
It was sampled, but no sampling point had enough results for a compliance determination.
Who supplies water to San Diego? ▼
San Diego Mud 1 (PWSID TX0660003). Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2024-11-08. No significant deficiencies were recorded.

What Should San Diego 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
Follow the open violation
This system has an unresolved violation. Contact the supplier for its corrective-action schedule.

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