Municipal utility district · Fort Bend County
Sienna MUD 12
On a typical Sienna home (about $510,286), Sienna MUD 12 adds about $2,602 a year to the tax bill, higher than most utility districts around Missouri City. Below: how to pay it, who to call, and what the district does.
Own a home in Missouri City? See what it would list for
- 0.51002025 tax rate per $100 of value
- $56.0Mbond debt outstanding, FY2025
- 2002year created
- 1,096acres
Pay & contact
Pay your Sienna MUD 12 bill or reach the district
- Pay or look up the MUD tax billTax Tech · (281) 499-1223. Search by address or account number.
- Water, sewer or a service problemSi Environmental · (832) 490-1600 (the district's operator, which runs the system and usually handles water billing)
- District websiteBoard meetings, notices, budgets and documents
- Check a specific addressFBCAD lists every taxing district on a property's record
Contacts are as the district reported them to the Texas Comptroller (2026). The tax bill for county, school and other units comes separately from the Fort Bend County Tax Office.
District facts
- Name
- Sienna MUD 12
- Type (TCEQ)
- MUD
- Created
- September 26, 2002
- Size
- 1,096 acres
- Status (TCEQ)
- Active
- TCEQ district ID
- 7573918
- FBCAD jurisdiction code
- M186
- County
- Fort Bend
Sienna MUD 12 tax rate
The 2025 adopted rate is 0.51000 per $100 of taxable value: 0.10000 for maintenance and operations and 0.39500 for debt service.
- Maintenance & operations
- Debt service
Rate by year
Sienna MUD 12 bond debt
Principal outstanding was $55,985,000 at the end of fiscal year 2025 (August 31), against a peak of $65,385,000 in FY2021.
Tax-supported and revenue principal outstanding at fiscal year end (Aug 31). As reported to the BRB; not independently verified.
Neighborhoods in Sienna MUD 12
Selling a home in Missouri City →
Where these numbers come from
- Texas Bond Review BoardIssuer page: bonds and debt by year
- Fort Bend County Tax OfficeAdopted and proposed rates (Truth in Taxation)
- TCEQ Water Districts (iWUD)Search Sienna MUD 12 for board, filings and boundaries
Sources: TCEQ Water Districts (iWUD) map service; Fort Bend County Tax Office, Truth in Taxation summary. Retrieved Oct 8, 2026.
FAQ
Sienna MUD 12 FAQ
What is the Sienna MUD 12 tax rate?
The 2025 adopted rate is 0.51000 per $100 of taxable value, about $510 a year on $100,000 of taxable value.
How much debt does Sienna MUD 12 have?
$55,985,000 in bond principal outstanding at the end of FY2025, as reported to the Texas Bond Review Board.
What neighborhoods are in Sienna MUD 12?
Sienna MUD 12 serves homes in Sienna. Confirm a specific address on FBCAD, where the district is listed among the account's taxing jurisdictions.
Selling a Home in a MUD?
We handle the MUD notice and explain the tax to buyers. A broker answers 7 days a week.