PWSID TX0660003
SAN DIEGO MUD 1
Community water system based in San Diego, TX
Service area on file with EPA: Duval County. EPA's recorded service area can be incomplete for regional authorities. The cities and counties above are what the utility has filed with EPA; the utility may serve additional areas.
- Population served
- 6,291
- Source
- Groundwater
- Status
- Active
At a glance
3 issues above the federal safety limit
-
Active violation
Lead and Copper Rule Revisions
EPA records an open, unresolved violation against this system for Lead and Copper Rule Revisions.
EPA status: Unaddressed · See details below
-
Active violation
Lead and Copper Rule Revisions
EPA records an open, unresolved violation against this system for Lead and Copper Rule Revisions.
EPA status: Unaddressed · See details below
-
The most recent test for lithium was higher than the federal safety limit for drinking water.
Most recent EPA PFAS test · See details below
-
CDC's My Water's Fluoride listing reports this system adjusts fluoride to the recommended level, or buys water from a system that does.
Per CDC My Water's Fluoride · See details below
Past 5 years: 24 health-based violations on file, all marked Resolved or Archived. See compliance history below.
Risk classification follows EPA's published values for safe drinking water, with caution and concern bands reviewed by a clinician. Past resolved violations do not influence this card. See methodology.
Lead service line inventory
No inventory data on file
We do not yet have this utility's published Lead Service Line Inventory on file. The EPA Lead and Copper Rule Improvements (LCRI) required every community water system to publish one by October 16, 2024 and to identify and replace any lead lines within 10 years. How lead enters drinking water.
Phase 1 coverage focuses on the largest NC utilities. Smaller systems will be added; in the meantime, ask your utility for their inventory or check their Consumer Confidence Report.
Lead and copper test results
The most recent measurement per contaminant from EPA's Lead and Copper Rule sampling.
Why only lead and copper, and not arsenic, nitrate, or others?
EPA's bulk SDWIS download is the only nationwide per-system sample data they publish, and it only includes the Lead and Copper Rule table. Values for other regulated contaminants (TTHMs, nitrate, arsenic, etc.) appear on this page only when they trigger a violation. For the full per-system contaminant suite, see the utility's annual Consumer Confidence Report (link further down the page).
| Contaminant | Most recent | Date | Risk |
|---|---|---|---|
| PB90 | 0 mg/L | December 31, 2025 | Below regulatory thresholds |
Data from EPA SDWIS (Lead and Copper Rule sample table) , last refreshed May 24, 2026.
PFAS and emerging contaminants
This system was tested 62 times under EPA's latest PFAS monitoring program; 1 of the 30 chemicals tested was detected.
What is this testing program?
EPA's fifth Unregulated Contaminant Monitoring Rule cycle (UCMR 5, 2023 to 2025) required every public water system serving over 3,300 people to test for 29 per- and polyfluoroalkyl substances (PFAS) plus lithium; 30 chemicals in total. Most recent detection per chemical shown below.
| Contaminant | Most recent detection | Date | Risk |
|---|---|---|---|
| 0.0668 mg/L | November 3, 2025 | Concern |
Tested but not detected (29 contaminants)
EPA tested for these substances and every sample was below the minimum reporting level. Absence of detection does not mean true zero; it means below the laboratory's quantitation threshold.
Data from EPA UCMR 5 (Unregulated Contaminant Monitoring Rule) , last refreshed May 24, 2026.
Fluoride
Per CDC My Water's Fluoride
SAN DIEGO MUD 1 adds fluoride to its drinking water.
CDC classifies a system as fluoridated when it adjusts fluoride to the recommended level, or when it buys water from a system that does. The U.S. Public Health Service recommends 0.7 mg/L for community water fluoridation.
Source: CDC My Water's Fluoride, listed under DUVAL CO CONS & RECLAM-SAN DIEGO (Duval County). Verify on CDC's site .
Area context
Duval County, TX (2020 data)
- Community water systems
- 7 of 7 add fluoride
- Population on fluoridated water
- 11,499 of 11,499 (100.0%)
Texas statewide (2020 data)
- Population on fluoridated water
- 19,743,163 of 27,818,869 (71.0%)
- Community water systems adding fluoride
- 2,573 of 6,046
Data from CDC My Water's Fluoride (per-system status) , last refreshed May 19, 2026.
Data from CDC Water Fluoridation Reporting System (state and county aggregates) , last refreshed May 16, 2026.
Recorded contaminant measurements (from violations)
When this system exceeded a regulatory limit and EPA recorded the measured value, that value is shown here. These are not routine sample results: they are the values the violation was triggered on.
| Period | Contaminant | Measured | Federal MCL | Status |
|---|---|---|---|---|
| April 1, 2024 | Arsenic | 0.011MG/L | 0.01 MG/L | Health-based |
| April 1, 2024 | Arsenic | 0.011MG/L | 0.01 MG/L | Health-based |
| April 1, 2024 | Arsenic | 0.011MG/L | 0.01 MG/L | Health-based |
| April 1, 2024 | Arsenic | 0.011MG/L | 0.01 MG/L | Health-based |
| April 1, 2024 | Arsenic | 0.011MG/L | 0.01 MG/L | Health-based |
| April 1, 2024 | Arsenic | 0.011MG/L | 0.01 MG/L | Health-based |
| January 1, 2024 | Arsenic | 0.013MG/L | 0.01 MG/L | Health-based |
| January 1, 2024 | Arsenic | 0.013MG/L | 0.01 MG/L | Health-based |
| January 1, 2024 | Arsenic | 0.013MG/L | 0.01 MG/L | Health-based |
| January 1, 2024 | Arsenic | 0.013MG/L | 0.01 MG/L | Health-based |
| January 1, 2024 | Arsenic | 0.013MG/L | 0.01 MG/L | Health-based |
| January 1, 2024 | Arsenic | 0.013MG/L | 0.01 MG/L | Health-based |
| January 1, 2024 | Arsenic | 0.011MG/L | 0.01 MG/L | Health-based |
| January 1, 2024 | Arsenic | 0.011MG/L | 0.01 MG/L | Health-based |
| January 1, 2024 | Arsenic | 0.011MG/L | 0.01 MG/L | Health-based |
| January 1, 2024 | Arsenic | 0.011MG/L | 0.01 MG/L | Health-based |
| January 1, 2024 | Arsenic | 0.011MG/L | 0.01 MG/L | Health-based |
| January 1, 2024 | Arsenic | 0.011MG/L | 0.01 MG/L | Health-based |
| October 1, 2023 | Arsenic | 0.013MG/L | 0.01 MG/L | Health-based |
| October 1, 2023 | Arsenic | 0.013MG/L | 0.01 MG/L | Health-based |
| October 1, 2023 | Arsenic | 0.013MG/L | 0.01 MG/L | Health-based |
| October 1, 2023 | Arsenic | 0.013MG/L | 0.01 MG/L | Health-based |
| October 1, 2023 | Arsenic | 0.013MG/L | 0.01 MG/L | Health-based |
| October 1, 2023 | Arsenic | 0.013MG/L | 0.01 MG/L | Health-based |
Data from EPA SDWIS (violation records) , last refreshed May 24, 2026.
Compliance history
EPA-recorded violations against this system over the last 5 years.
How to read this section
Health-based violations are when a measured limit was exceeded; the measured concentration is shown alongside the EPA federal limit where SDWIS published it. Monitoring and reporting items are paperwork issues (missed sample dates, late filings) that do not themselves indicate unsafe water.
2 active health-based violations
EPA records 2 health-based violations that have not yet been resolved. An additional 24 health-based violations in the last 5 years are already resolved.
| Period start | Contaminant | What happened | Measured level | Status |
|---|---|---|---|---|
| October 17, 2024 | Lead and Copper Rule Revisions | LSL Inventory | Not reported | Unaddressed |
| October 17, 2024 | Lead and Copper Rule Revisions | LSL Inventory | Not reported | Unaddressed |
| April 1, 2024 | Arsenic | Maximum Contaminant Level Violation, Average | 0.011 MG/L
MCL 0.010 MG/L | Resolved |
| April 1, 2024 | Arsenic | Maximum Contaminant Level Violation, Average | 0.011 MG/L
MCL 0.010 MG/L | Resolved |
| April 1, 2024 | Arsenic | Maximum Contaminant Level Violation, Average | 0.011 MG/L
MCL 0.010 MG/L | Resolved |
| April 1, 2024 | Arsenic | Maximum Contaminant Level Violation, Average | 0.011 MG/L
MCL 0.010 MG/L | Resolved |
| April 1, 2024 | Arsenic | Maximum Contaminant Level Violation, Average | 0.011 MG/L
MCL 0.010 MG/L | Resolved |
| April 1, 2024 | Arsenic | Maximum Contaminant Level Violation, Average | 0.011 MG/L
MCL 0.010 MG/L | Resolved |
| January 1, 2024 | Arsenic | Maximum Contaminant Level Violation, Average | 0.013 MG/L
MCL 0.010 MG/L | Resolved |
| January 1, 2024 | Arsenic | Maximum Contaminant Level Violation, Average | 0.013 MG/L
MCL 0.010 MG/L | Resolved |
| January 1, 2024 | Arsenic | Maximum Contaminant Level Violation, Average | 0.013 MG/L
MCL 0.010 MG/L | Resolved |
| January 1, 2024 | Arsenic | Maximum Contaminant Level Violation, Average | 0.013 MG/L
MCL 0.010 MG/L | Resolved |
| January 1, 2024 | Arsenic | Maximum Contaminant Level Violation, Average | 0.013 MG/L
MCL 0.010 MG/L | Resolved |
| January 1, 2024 | Arsenic | Maximum Contaminant Level Violation, Average | 0.013 MG/L
MCL 0.010 MG/L | Resolved |
| January 1, 2024 | Arsenic | Maximum Contaminant Level Violation, Average | 0.011 MG/L
MCL 0.010 MG/L | Resolved |
| January 1, 2024 | Arsenic | Maximum Contaminant Level Violation, Average | 0.011 MG/L
MCL 0.010 MG/L | Resolved |
| January 1, 2024 | Arsenic | Maximum Contaminant Level Violation, Average | 0.011 MG/L
MCL 0.010 MG/L | Resolved |
| January 1, 2024 | Arsenic | Maximum Contaminant Level Violation, Average | 0.011 MG/L
MCL 0.010 MG/L | Resolved |
| January 1, 2024 | Arsenic | Maximum Contaminant Level Violation, Average | 0.011 MG/L
MCL 0.010 MG/L | Resolved |
| January 1, 2024 | Arsenic | Maximum Contaminant Level Violation, Average | 0.011 MG/L
MCL 0.010 MG/L | Resolved |
| October 1, 2023 | Arsenic | Maximum Contaminant Level Violation, Average | 0.013 MG/L
MCL 0.010 MG/L | Resolved |
| October 1, 2023 | Arsenic | Maximum Contaminant Level Violation, Average | 0.013 MG/L
MCL 0.010 MG/L | Resolved |
| October 1, 2023 | Arsenic | Maximum Contaminant Level Violation, Average | 0.013 MG/L
MCL 0.010 MG/L | Resolved |
| October 1, 2023 | Arsenic | Maximum Contaminant Level Violation, Average | 0.013 MG/L
MCL 0.010 MG/L | Resolved |
| October 1, 2023 | Arsenic | Maximum Contaminant Level Violation, Average | 0.013 MG/L
MCL 0.010 MG/L | Resolved |
| October 1, 2023 | Arsenic | Maximum Contaminant Level Violation, Average | 0.013 MG/L
MCL 0.010 MG/L | Resolved |
10 monitoring and reporting item s (paperwork) , 4 still open · these are not health risks
| Period start | Relates to | Item | Status |
|---|---|---|---|
| July 1, 2025 | Consumer Confidence Rule | Consumer Confidence Report Inadequate Reporting | Unaddressed |
| June 30, 2025 | Public Notice | Public Notification Violation for NPDWR Violation | Unaddressed |
| October 17, 2024 | Lead and Copper Rule Revisions | LSL Reporting | Unaddressed |
| October 17, 2024 | Lead and Copper Rule Revisions | LSL Reporting | Unaddressed |
| April 15, 2024 | Public Notice | Public Notification Violation for NPDWR Violation | Resolved |
| April 15, 2024 | Public Notice | Public Notification Violation for NPDWR Violation | Resolved |
| February 1, 2024 | Revised Total Coliform Rule | Monitoring, Routine (RTCR) | Resolved |
| February 1, 2024 | Revised Total Coliform Rule | Monitoring, Routine (RTCR) | Resolved |
| February 1, 2024 | Revised Total Coliform Rule | Monitoring, Routine (RTCR) | Resolved |
| February 1, 2024 | Revised Total Coliform Rule | Monitoring, Routine (RTCR) | Resolved |
4 older violation s (5-10 years ago) · all paperwork (monitoring/reporting), none health-based , all resolved
| Period start | Relates to | Item | Measured level | Status |
|---|---|---|---|---|
| July 1, 2018 | Consumer Confidence Rule | Consumer Confidence Report Complete Failure to Report | — | Resolved |
| July 1, 2018 | Consumer Confidence Rule | Consumer Confidence Report Complete Failure to Report | — | Resolved |
| December 30, 2016 | Lead and Copper Rule | Lead Consumer Notice | — | Resolved |
| December 30, 2016 | Lead and Copper Rule | Lead Consumer Notice | — | Resolved |
Data from EPA SDWIS (violation records) , last refreshed May 24, 2026.
Where to see every contaminant this utility tested for
EPA's bulk SDWIS dataset gives MyTapWater.us per-system measured values for lead and copper, plus violation records for everything else. To see every regulated contaminant this utility tested for in the past year (TTHMs, HAA5, nitrate, arsenic, fluoride, chromium, etc.) with measured values, read the utility's Consumer Confidence Report (CCR).
Every community water system is required by EPA to publish a CCR annually, by July 1, listing every contaminant they sampled, the measured value, the federal limit, and any health-based exceedances. Most utilities post the report online; some mail it with your bill.
How to find SAN DIEGO MUD 1's CCR:
- Search the web for "SAN DIEGO MUD 1 consumer confidence report" . The PDF is usually on the utility's own website.
- Or call the utility directly. Their phone number is in the contact section below.
Other water systems in Duval County, TX
Compare nearby utilities by population served.
- FREER WCID
2,923 served · Duval County
- DUVAL COUNTY CRD BENAVIDES
2,285 served · Duval County
- CITY OF SAN DIEGO GLOSSBRENNER UNIT
545 served · Duval County
- DUVAL COUNTY CRD REALITOS
200 served · Duval County
- DUVAL COUNTY CRD CONCEPCION
160 served · Duval County
Contact this utility
Public administrative contact information for this water system, as filed with the EPA. Use this to ask about your service line, request your home's lead status, or report a water quality issue.
- Administrator
- BRIONES, JOSE
- Mailing address
- 200 S DR E E DUNLAP HWYSAN DIEGO, TX 78384-3204
Where this page's data comes from
Bundle released 2026-Q2, regenerated May 24, 2026. Each section above also shows its own source date so you can tell at a glance how fresh that part of the page is.
- EPA SDWIS bulk download — last refreshed May 24, 2026 (system info, violations, lead and copper samples).
- EPA UCMR 5 (Unregulated Contaminant Monitoring Rule) — last refreshed May 24, 2026 (PFAS and lithium).
- CDC My Water's Fluoride — last refreshed May 19, 2026 (per-system Yes/No fluoridation status).
- CDC Water Fluoridation Reporting System — last refreshed May 16, 2026 (state and county fluoridation aggregates).
Every value on this page is cross-verified before publication; read our methodology for the verification steps and corrections process.