Public water system record

City of Mathis

Serves Mathis, San Patricio County, TX · 5,001 people served

Federal records show 23 health-based violations and 16 monitoring/reporting issues for City of Mathis in the last ten years, including an unresolved LEAD AND COPPER RULE REVISIONS violation.

TX2050003
MATHIS
TX
5,001 served

System profile

Source water Surface water

ZIP 78368

EPA system ID TX2050003

Verify this system on EPA ECHO →

Health-based violations, last 10 years: 23
Resolved: 20
Unresolved: 1
Archived by EPA: 2
Any acute record: No
Monitoring issues, last 10 years: 16

Key facts

City of Mathis draws water from 1 surface water intake.
Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 0.117 mg/L, federal limit 0.08 mg/L (1.5 times the limit), 2023.
Most recent formal enforcement: compliance order with a penalty by Texas, June 2024.
Record on file since 1992, with 12 health-based violations before October 19, 2016.

Check whether City of Mathis serves your address

Health-based violations

Since October 2016

Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.

Contaminant	Rule family	Start date	Status	Acute
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.09 mg/L, federal limit 0.08 mg/L (1.1 times the limit)	220	Jul 1, 2025	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.086 mg/L, federal limit 0.08 mg/L (1.1 times the limit)	220	Apr 1, 2025	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
LEAD AND COPPER RULE REVISIONS Treatment technique failure	350	Oct 17, 2024	Active	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.093 mg/L, federal limit 0.08 mg/L (1.2 times the limit)	220	Jul 1, 2023	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.117 mg/L, federal limit 0.08 mg/L (1.5 times the limit)	220	Apr 1, 2023	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.115 mg/L, federal limit 0.08 mg/L (1.4 times the limit)	220	Jan 1, 2023	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.105 mg/L, federal limit 0.08 mg/L (1.3 times the limit)	220	Oct 1, 2022	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.093 mg/L, federal limit 0.08 mg/L (1.2 times the limit)	220	Jul 1, 2022	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.084 mg/L, federal limit 0.08 mg/L (1.1 times the limit)	220	Apr 1, 2022	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.086 mg/L, federal limit 0.08 mg/L (1.1 times the limit)	220	Jan 1, 2022	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.081 mg/L, federal limit 0.08 mg/L (at or just above the limit)	220	Oct 1, 2021	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.082 mg/L, federal limit 0.08 mg/L (at or just above the limit)	220	Jul 1, 2021	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.089 mg/L, federal limit 0.08 mg/L (1.1 times the limit)	220	Oct 1, 2018	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.102 mg/L, federal limit 0.08 mg/L (1.3 times the limit)	220	Jul 1, 2018	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.105 mg/L, federal limit 0.08 mg/L (1.3 times the limit)	220	Apr 1, 2018	Resolved	No
Haloacetic Acids (HAA5) Contaminant limit exceeded Measured 0.063 mg/L, federal limit 0.06 mg/L (1.1 times the limit)	220	Jan 1, 2018	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.115 mg/L, federal limit 0.08 mg/L (1.4 times the limit)	220	Jan 1, 2018	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.11 mg/L, federal limit 0.08 mg/L (1.4 times the limit)	220	Oct 1, 2017	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.107 mg/L, federal limit 0.08 mg/L (1.3 times the limit)	220	Jul 1, 2017	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.107 mg/L, federal limit 0.08 mg/L (1.3 times the limit)	220	Jul 1, 2017	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.097 mg/L, federal limit 0.08 mg/L (1.2 times the limit)	220	Apr 1, 2017	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.087 mg/L, federal limit 0.08 mg/L (1.1 times the limit)	220	Jan 1, 2017	Resolved	No
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.081 mg/L, federal limit 0.08 mg/L (at or just above the limit)	220	Jan 1, 2017	Resolved	No

Monitoring and reporting issues

Since October 2016

Missed tests or reports, not contaminants found above a limit.

Issue	Start date	Status
Public Notice OTHER	Jul 26, 2025	Resolved
Consumer Confidence Rule OTHER	Jul 1, 2025	Active
Public Notice OTHER	May 1, 2025	Active
Lead and Copper Rule Monitoring and reporting	Dec 30, 2024	Resolved
LEAD AND COPPER RULE REVISIONS RPT	Oct 17, 2024	Active
Consumer Confidence Rule OTHER	Jul 2, 2024	Resolved
Lead and Copper Rule Monitoring and reporting	Mar 31, 2024	Resolved
Public Notice OTHER	Dec 31, 2023	Resolved
Public Notice OTHER	Dec 21, 2023	Resolved
Total Trihalomethanes (TTHMs) Monitoring and reporting	Oct 6, 2023	Resolved
Interim Enhanced Surface Water Treatment Rule Monitoring and reporting	Jul 1, 2023	Resolved
Public Notice OTHER	Mar 23, 2023	Resolved
Public Notice OTHER	Jan 19, 2023	Resolved
Lead and Copper Rule Monitoring and reporting	Oct 1, 2022	Resolved
Public Notice OTHER	Mar 14, 2018	Resolved
Lead and Copper Rule Monitoring and reporting	Dec 30, 2013	Resolved

Full record since 1992

EPA's records for City of Mathis go back to 1992. Before October 19, 2016 they list 12 health-based violations (12 resolved) and 5 monitoring or reporting violations.

Violations that began in	Health-based	Monitoring and reporting
1990s	0	1
2000s	9	2
2010 to October 18, 2016	3	2
October 19, 2016 to 2019	11	1
2020s	12	14

Most recent health-based violation before October 19, 2016: Total Coliform, began August 2013, Resolved.

Show all 12 health-based violations before October 19, 2016

Contaminant	Start date	Status
Total Coliform Contaminant limit exceeded	Aug 1, 2013	Resolved
Total Coliform Contaminant limit exceeded	Oct 1, 2012	Resolved
Total Coliform Contaminant limit exceeded	Jan 1, 2010	Resolved
Surface Water Treatment Rule Treatment technique failure	Apr 1, 2005	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 1.106 mg/L, federal limit 0.08 mg/L (14 times the limit)	Apr 1, 2005	Resolved
Surface Water Treatment Rule Treatment technique failure	Feb 1, 2005	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.224 mg/L, federal limit 0.08 mg/L (2.8 times the limit)	Jan 1, 2005	Resolved
Haloacetic Acids (HAA5) Contaminant limit exceeded Measured 0.085 mg/L, federal limit 0.06 mg/L (1.4 times the limit)	Oct 1, 2004	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.218 mg/L, federal limit 0.08 mg/L (2.7 times the limit)	Oct 1, 2004	Resolved
Haloacetic Acids (HAA5) Contaminant limit exceeded Measured 0.085 mg/L, federal limit 0.06 mg/L (1.4 times the limit)	Jul 1, 2004	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.218 mg/L, federal limit 0.08 mg/L (2.7 times the limit)	Jul 1, 2004	Resolved
Total Trihalomethanes (TTHMs) Contaminant limit exceeded Measured 0.144 mg/L, federal limit 0.08 mg/L (1.8 times the limit)	Apr 1, 2004	Resolved

Enforcement actions

Texas regulators took 3 formal enforcement actions against City of Mathis between 2006 and 2024. The most recent was a compliance order with a penalty in June 2024.

Date	By	Action	Violations covered
Jun 26, 2024	Texas	Compliance order with a penalty	3 violations (3 health-based): Total Trihalomethanes (TTHMs)
Sep 7, 2018	Texas	Compliance order with a penalty	8 violations (8 health-based): Total Trihalomethanes (TTHMs)
Feb 5, 2006	Texas	Compliance order with a penalty	7 violations (7 health-based): Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5)

What the violations mean

Total Trihalomethanes (TTHMs)

21 incidents

Disinfection byproduct levels exceeded the federal limit

Long-term TTHM exposure may increase bladder cancer risk

LEAD AND COPPER RULE REVISIONS

1 incident

The 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.

Haloacetic Acids (HAA5)

1 incident

Haloacetic acid byproducts exceeded the federal limit

Long-term exposure to HAAs may increase cancer risk

Where the water comes from

City of Mathis draws water from 1 surface water intake. 1 smaller public system such as schools, businesses or campgrounds buys water from City of Mathis.

Annual water quality report

City of Mathis 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