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Public water system record

Sonterra MUD

Serves Sonterra, Williamson County, TX · 16,614 people served

Federal records show 2 health-based violations and 4 monitoring/reporting issues for Sonterra MUD in the last ten years. The most serious issue in this window was a resolved Fluoride violation.

  • TX2460157
  • AUSTIN
  • TX
  • 16,614 served

System profile

Source water Purchased surface water
ZIP 78701
EPA system ID TX2460157

Verify this system on EPA ECHO →

Health-based violations, last 10 years
2
Resolved
2
Unresolved
0
Any acute record
No
Monitoring issues, last 10 years
4

Key facts

  • Sonterra MUD draws water from 5 wells.
  • Highest measured level in the last 10 years: Fluoride, 4.3 mg/L, federal limit 4 mg/L (1.1 times the limit), 2017.
  • Record on file since 2012, with 0 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 0 unknown out of 4,029 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
Fluoride
Contaminant limit exceeded
Measured 4.3 mg/L, federal limit 4 mg/L (1.1 times the limit)
 330 Apr 1, 2017 Resolved No
Fluoride
Contaminant limit exceeded
Measured 4.3 mg/L, federal limit 4 mg/L (1.1 times the limit)
 330 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
Lead and Copper Rule
Monitoring and reporting
 Dec 30, 2024 Resolved
Lead and Copper Rule
Monitoring and reporting
 Jul 1, 2018 Resolved
Lead and Copper Rule
Monitoring and reporting
 Jul 1, 2018 Resolved
Lead and Copper Rule
Monitoring and reporting
 Jul 1, 2018 Resolved

Full record since 2012

EPA's records for Sonterra MUD go back to 2012. Before October 19, 2016 they list no health-based violations and 1 monitoring or reporting violation.

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

What the violations mean

Fluoride

2 incidents

Fluoride exceeded the federal limit

Excessive fluoride can cause dental and skeletal fluorosis

Where the water comes from

Sonterra MUD draws water from 5 wells. It also buys water from Lone Star Rwa. It also has an emergency connection to Jarrell Schwertner WSC. 1 other public water system has an emergency connection to Sonterra MUD.

Buys water from

Emergency or part-time connections to

Annual water quality report

Sonterra MUD 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