Community Water System · PWS TX2460139
Vista Oaks MUD
Austin, Texas 78701-2744 - drinking water served from surface water sources to 2,724 people, tracked in EPA SDWIS and UCMR5.
- 2,724
- People served
- 17
- EPA violations
- 1
- Health-based
- Untested
- UCMR5 result
The verdict
EPA records 17 drinking-water violations at Vista Oaks MUD, 6% of them health-based - below the Texas per-system average.
- 17
- Total EPA violations on record
- 6%
- Health-based (MCL / treatment failure)
- 2,724
- People served by this system
- N/A
- PFAS compounds detected (UCMR5)
Water Quality Snapshot: Vista Oaks MUD
Vista Oaks MUD is a local-owned community water system that delivers drinking water to 2,724 residents in Austin, Texas (Williamson County) through 909 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 17 total violations for this system , of which 1 (6%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 10 monitoring and reporting violations are on file. The most recent violation on record dates to 2011.
The most frequently cited contaminant at this system is Coliform (TCR), recorded in 10 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.
Across Texas, EPA tracks 7,351 public water systems serving 33,253,313 people, with 746,210 cumulative violations and 162,945 health-based violations on record. About 90% of systems in the state carry at least one violation, and state-wide the average per system is 101.5 violations. Statewide, 1,068 of 1,147 UCMR5-tested systems have reported PFAS detections (93.1%).
Vista Oaks MUD's 17 violations sit below the Texas average.
All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 909
- County
- Williamson
- School/Daycare
- No
- MCL Violations
- 1
- Monitoring Violations
- 10
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 10 | 2006 |
| Public Notice | Other | 5 | 2011 |
| Coliform (TCR) | Other | 1 | 1993 |
| Coliform (TCR) | MCL | 1 | 2011 |
Verify This Water System
The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Vista Oaks MUD.
EPA SDWIS, Federal Reports
EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:
View PWS ID TX2460139 on SDWISSource: EPA SDWIS Federal Reports Search
Texas Drinking Water Authority
Texas Commission on Environmental Quality (TCEQ) - Drinking Water Watch is the primacy agency that licenses and inspects Vista Oaks MUD under EPA-delegated authority.
Open TX regulator portalSource: Texas Commission on Environmental Quality (TCEQ) - Drinking Water Watch
Violation Timeline
Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.
| Year (latest) | Contaminant | Category | Count | EPA Record |
|---|---|---|---|---|
| 2011 | Public Notice | Other | 5 | SDWIS / TX2460139 / 7500 |
| 2011 | Coliform (TCR) | MCL | 1 | SDWIS / TX2460139 / 3100 |
| 2006 | Coliform (TCR) | MR | 10 | SDWIS / TX2460139 / 3100 |
| 1993 | Coliform (TCR) | Other | 1 | SDWIS / TX2460139 / 3100 |
How Vista Oaks MUD Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | Vista Oaks MUD | Texas avg | Federal benchmark |
|---|---|---|---|
| Total violations | 17 | 101.5 | SDWA compliance, any non-zero count is a recorded breach |
| Health-based violations | 1 | 22.2 | Indicates a contaminant exceeded a federal MCL |
| PFAS detection | None | 93.1% | EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt |
| Population served | 2,724 | 4,524 | Sizing context for compliance burden |
Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 7,351 regulated public water systems in Texas.
Federal MCL reference, Safe Drinking Water Act thresholds ▼
| Contaminant | Federal MCL / Action Level | Note |
|---|---|---|
| Lead | 0 mg/L (Action Level: 0.015 mg/L) | Lead and Copper Rule treatment technique |
| Arsenic | 0.010 mg/L (10 ppb) | Health-based MCL since 2006 |
| Total Coliform | Treatment technique (RTCR) | Indicator organism, monitoring trigger |
| PFOA / PFOS (PFAS) | 4.0 ppt each (final 2024 rule) | Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026) |
| Nitrate (as N) | 10 mg/L | Acute health risk for infants |
Frequently Asked Questions
Is Vista Oaks MUD water safe to drink? ▼
How many people does Vista Oaks MUD serve? ▼
What type of violations does Vista Oaks MUD have? ▼
Has PFAS been detected in Vista Oaks MUD water? ▼
What water source does Vista Oaks MUD use? ▼
Where does this data come from? ▼
Read our methodology - how this data is sourced, computed, and verified.
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.