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Public water system record

North Alamo WSC

Serves an area of Hidalgo County and Willacy County, TX that includes Edinburg, Murillo, Doolittle and 28 more places · 171,195 people served

Federal records show 5 health-based violations and 3 monitoring/reporting issues for North Alamo WSC in the last ten years. The most serious issue in this window was a Total Trihalomethanes (TTHMs) violation that EPA lists as archived, not resolved.

  • TX1080029
  • EDINBURG
  • TX
  • 171,195 served

System profile

Source water Surface water
ZIP 78542
EPA system ID TX1080029

Verify this system on EPA ECHO →

Health-based violations, last 10 years
5
Resolved
3
Unresolved
0
Archived by EPA
2
Any acute record
No
Monitoring issues, last 10 years
3

Key facts

  • North Alamo WSC draws water from 6 wells and 6 surface water intakes.
  • Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 0.095 mg/L, federal limit 0.08 mg/L (1.2 times the limit), 2017.
  • Most recent formal enforcement: compliance order with a penalty by Texas, April 2019.
  • Record on file since 2002, with 5 health-based violations before October 19, 2016.
  • Lead pipe inventory: 6 lead and 10,260 unknown out of 54,810 service lines.

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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 0.084 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 220 Oct 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 0.081 mg/L, federal limit 0.08 mg/L (at or just above 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 0.081 mg/L, federal limit 0.08 mg/L (at or just above the limit)
 220 Jan 1, 2018 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.09 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 220 Oct 1, 2017 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.095 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
 220 Jul 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
Consumer Confidence Rule
OTHER
 Jul 1, 2025 Active
Lead and Copper Rule
Monitoring and reporting
 Mar 31, 2024 Resolved
Total Trihalomethanes (TTHMs)
Monitoring and reporting
 Sep 26, 2023 Resolved

Full record since 2002

EPA's records for North Alamo WSC go back to 2002. Before October 19, 2016 they list 5 health-based violations (5 resolved) and 19 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
2000s 0 7
2010 to October 18, 2016 5 12
October 19, 2016 to 2019 3 0
2020s 2 3

Most recent health-based violation before October 19, 2016: Total Trihalomethanes (TTHMs), began July 2015, Resolved.

Show all 5 health-based violations before October 19, 2016
Contaminant Start date Status
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.085 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 Jul 1, 2015 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.094 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
 Apr 1, 2015 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.102 mg/L, federal limit 0.08 mg/L (1.3 times the limit)
 Jan 1, 2015 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.085 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 Oct 1, 2014 Resolved
Total Coliform
Contaminant limit exceeded
 Sep 1, 2011 Resolved

Enforcement actions

Texas regulators took 2 formal enforcement actions against North Alamo WSC between 2016 and 2019. The most recent was a compliance order with a penalty in April 2019.

Date By Action Violations covered
Apr 26, 2019 Texas Compliance order with a penalty 3 violations (3 health-based): Total Trihalomethanes (TTHMs)
Apr 28, 2016 Texas Compliance order with a penalty 3 violations (3 health-based): Total Trihalomethanes (TTHMs)

What the violations mean

Total Trihalomethanes (TTHMs)

5 incidents

Disinfection byproduct levels exceeded the federal limit

Long-term TTHM exposure may increase bladder cancer risk

Where the water comes from

North Alamo WSC draws water from 6 wells and 6 surface water intakes. It also buys water from North Cameron Regional Water Treatment F. It also has emergency connections to City of Weslaco, City of Mercedes, City of Raymondville and City of Edinburg. 3 other community water systems buy water from North Alamo WSC. 8 other public water systems have emergency connections to North Alamo WSC.

Buys water from

  • North Cameron Regional Water Treatment F Rio Hondo, TX

Emergency or part-time connections to

Community systems that buy water from it

Annual water quality report

North Alamo WSC 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.

Systems serving 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.

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