Sienna Municipal Utility District 3
EPA ID: TX0790376 · 7,365 people served · 1 ZIP code
ZipCheckup's reading of EPA SDWIS for Sienna Municipal Utility District 3 (TX0790376): 1 EPA violation in the last five years. Within the five-year EPA monitoring span, Sienna Municipal Utility District 3 accumulated 1 violation - every finding has been resolved and the utility operates in full compliance today, supplying water to approximately 7,365 people without any active enforcement proceedings.
Data: EPA SDWIS
Service Area Map
Coverage area for Sienna Municipal Utility District 3 Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Sienna Municipal Utility District 3 serves a community with a median household income of $132,758 and an estimated 81,251 residents across its service area.
💧 Where Does Your Water Come From?
Sienna Municipal Utility District 3's water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
Wastewater Proximity Note: This service area ranks in the 70th percentile nationally for proximity to wastewater discharge points.
Infrastructure Risk
Detected Contaminants
How Sienna Municipal Utility District 3 compares to EPA limits
What This Means For You
Consumer Confidence Report Rule at 1 mg/L exceeds the EPA maximum of mg/L.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 4 detections recorded.
Comparable Water Systems
Similar-sized systems in Texas
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
Sienna Municipal Utility District 3 (EPA ID: TX0790376) is a community water system in Texas that serves approximately 7,365 people from groundwater sources.
This system serves ZIP code 77459 in Missouri City.
Violation History
Status breakdown for accepted records with record years 2021-2026: 1 resolved, 0 archived, 0 addressed, and 0 unaddressed. Under this source contract, current noncompliance is the sum of addressed and unaddressed records. Archived and resolved records are excluded from current noncompliance.
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| November 1, 2025 | Consumer Confidence Report Rule | Non-health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Consumer Confidence Report Rule | Reporting Failure | 1 | No |
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.0005 mg/L | No | N/A |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by TX or modeled from parcel and building-footprint data.
- 77459 - Missouri City
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Sienna Municipal Utility District 3 (TX0790376) on EPA.gov.
Frequently Asked Questions
Is Sienna Municipal Utility District 3 water safe to drink?
The accepted 2026Q2 ECHO snapshot shows no current noncompliance for Sienna Municipal Utility District 3; its 1 accepted 2021-2026 record are resolved or archived. Historical compliance status does not establish conditions at a specific tap.
How many people does Sienna Municipal Utility District 3 serve?
Sienna Municipal Utility District 3 serves approximately 7,365 people across 1 ZIP code in Texas.
Where does Sienna Municipal Utility District 3 get its water?
The primary water source is groundwater.
Federal UCMR5 PFAS Monitoring: Detected
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). PFAS compounds were detected below the current state-enforceable MCL.
Current MCL reflects the lowest state-enforceable limit (NYS 10 ppt for PFOA/PFOS, effective August 2020). The federal final MCL of 4 ppt for PFOA/PFOS (EPA April 2024 rule) is not enforceable until April 2029. Detections above 4 ppt but below 10 ppt are below current MCL but above the future federal limit.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Sienna Municipal Utility District 3 (TX): 1 EPA Violation. https://zipcheckup.com/water-system/tx0790376/
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title = {{Sienna Municipal Utility District 3 (TX): 1 EPA Violation}},
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url = {https://zipcheckup.com/water-system/tx0790376/}
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What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Sienna Municipal Utility District 3 (EPA ID: TX0790376) - request the latest Consumer Confidence Report or ask about specific contaminants.