Public water system record
Manville WSC
Serves an area of Travis County and Williamson County, TX that includes Hornsby Bend, Manor, Webberville and 1 more place · 39,648 people served
Federal records show 5 health-based violations and 5 monitoring/reporting issues for Manville 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.
System profile
- Health-based violations, last 10 years
- 5
- Resolved
- 1
- Unresolved
- 0
- Archived by EPA
- 4
- Any acute record
- No
- Monitoring issues, last 10 years
- 5
Key facts
- Manville WSC draws water from 31 wells (1 of them for emergency, seasonal or other part-time use).
- Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 0.094 mg/L, federal limit 0.08 mg/L (1.2 times the limit), 2025.
- Record on file since 1992, with 1 health-based violation before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 12,511 service lines.
Check whether Manville WSC 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 |
|---|---|---|---|---|
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.092 mg/L, federal limit 0.08 mg/L (1.2 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 0.094 mg/L, federal limit 0.08 mg/L (1.2 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 0.09 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 |
|
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, 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 | Oct 1, 2020 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jun 5, 2025 | Resolved |
|
E. coli
Monitoring and reporting
|
Apr 9, 2025 | Resolved |
|
E. coli
Monitoring and reporting
|
Oct 16, 2024 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jul 1, 2018 | Resolved |
|
E. coli
Monitoring and reporting
|
Oct 1, 2012 | Active |
Full record since 1992
EPA's records for Manville WSC go back to 1992. Before October 19, 2016 they list 1 health-based violation (1 resolved) and 22 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 0 | 1 |
| 2000s | 1 | 17 |
| 2010 to October 18, 2016 | 0 | 4 |
| October 19, 2016 to 2019 | 0 | 1 |
| 2020s | 5 | 3 |
Most recent health-based violation before October 19, 2016: Total Coliform, began October 2007, Resolved.
Show the health-based violation before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform
Contaminant limit exceeded
|
Oct 1, 2007 | Resolved |
What the violations mean
Total Trihalomethanes (TTHMs)
5 incidentsDisinfection byproduct levels exceeded the federal limit
Long-term TTHM exposure may increase bladder cancer risk
Where the water comes from
Manville WSC draws water from 31 wells (1 of them for emergency, seasonal or other part-time use). It also buys water from City of Pflugerville. It also has an emergency connection to 130 Regional WSC. 14 other community water systems buy water from Manville WSC.
Buys water from
- City of Pflugerville Pflugerville, TX
Emergency or part-time connections to
- 130 Regional WSC Caldwell, TX
Community systems that buy water from it
- Briarcreek Subdivision Austin, TX
- City of Hutto Hutto, TX
- City of Manor Manor, TX
- City of Pflugerville Pflugerville, TX
- Kelly Lane WCID 1 Austin, TX
- Kelly Lane WCID 2 Austin, TX
- Lakeside MUD 3 Austin, TX
- Lakeside MUD 5 Austin, TX
- Lakeside WCID 1 Austin, TX
- Lakeside WCID 2-A Austin, TX
- Lakeside WCID 2-B Austin, TX
- Lakeside WCID 2-C Austin, TX
- Lakeside WCID 2D Austin, TX
- Williamson County Wsid 3 Austin, TX
Annual water quality report
Manville 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