Public water system record
San Diego MUD 1
Serves an area of Duval County, TX that includes San Diego · 6,291 people served
Federal records show 5 health-based violations and 7 monitoring/reporting issues for San Diego MUD 1 in the last ten years, including an unresolved LEAD AND COPPER RULE REVISIONS violation.
System profile
- Health-based violations, last 10 years
- 5
- Resolved
- 4
- Unresolved
- 1
- Any acute record
- No
- Monitoring issues, last 10 years
- 7
Key facts
- San Diego MUD 1 draws water from 8 wells.
- Highest measured level in the last 10 years: Arsenic, 0.013 mg/L, federal limit 0.01 mg/L (1.3 times the limit), 2024.
- Most recent formal enforcement: compliance order (no penalty) by Texas, July 2025.
- Record on file since 1992, with 0 health-based violations before October 19, 2016.
Check whether San Diego MUD 1 serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
LEAD AND COPPER RULE REVISIONS
Treatment technique failure
|
350 | Oct 17, 2024 | Active | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.011 mg/L, federal limit 0.01 mg/L (1.1 times the limit)
|
330 | Apr 1, 2024 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.011 mg/L, federal limit 0.01 mg/L (1.1 times the limit)
|
330 | Jan 1, 2024 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.013 mg/L, federal limit 0.01 mg/L (1.3 times the limit)
|
330 | Jan 1, 2024 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.013 mg/L, federal limit 0.01 mg/L (1.3 times the limit)
|
330 | Oct 1, 2023 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2025 | Active |
|
Public Notice
OTHER
|
Jun 30, 2025 | Active |
|
LEAD AND COPPER RULE REVISIONS
RPT
|
Oct 17, 2024 | Active |
|
Public Notice
OTHER
|
Apr 15, 2024 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Feb 1, 2024 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2018 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Dec 30, 2016 | Resolved |
Full record since 1992
EPA's records for San Diego MUD 1 go back to 1992. Before October 19, 2016 they list no health-based violations and 3 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 0 | 1 |
| 2010 to October 18, 2016 | 0 | 2 |
| October 19, 2016 to 2019 | 0 | 2 |
| 2020s | 5 | 5 |
Enforcement actions
Texas regulators took 1 formal enforcement action against San Diego MUD 1 in 2025. The most recent was a compliance order (no penalty) in July 2025.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Jul 16, 2025 | Texas | Compliance order (no penalty) | 4 violations (4 health-based): Arsenic |
What the violations mean
Arsenic
4 incidentsArsenic exceeded the federal limit
Long-term arsenic exposure is linked to cancer and cardiovascular effects
LEAD AND COPPER RULE REVISIONS
1 incidentThe system did not complete a treatment step or action that the LEAD AND COPPER RULE REVISIONS requires (a treatment technique violation).
The utility had to notify customers about this violation.
Where the water comes from
San Diego MUD 1 draws water from 8 wells. 1 other community water system buys water from San Diego MUD 1.
Community systems that buy water from it
- City of San Diego Glossbrenner Unit San Diego, TX
Annual water quality report
San Diego MUD 1 must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Texas.
Certified drinking water labs by state EPA guidance for private wells