Texas MUDs, Explained for Developers and Builders

Drive west or north out of Houston and most new communities you pass were financed the same way. Their water, sewer and drainage were paid for by a municipal utility district: a small government created for that ground, which borrows against the homes that will be built on it.

For a developer, a MUD is how millions of dollars of horizontal cost come back. For a builder, it is a tax line that sits in every buyer's monthly payment. Here is how the machinery works, and where it decides the economics of a lot.

What a MUD is

A MUD is a political subdivision of the State of Texas, authorized by article XVI, section 59 of the Texas Constitution and governed by chapters 49 and 54 of the Water Code. It exists to provide water, wastewater and drainage to land that a city's utilities do not reach.

Like any local government it can levy a property tax, issue bonds and charge fees, and it is run by its own board. Unlike a homeowners association, it is not a private contract among neighbors: its tax is collected alongside county, city and school taxes, and it is secured against the property, not the owner.

Why Houston runs on MUDs

Houston grew past its own pipes. Much of the region's new single-family land sits outside city limits, often in the city's extraterritorial jurisdiction, and someone has to build the utilities before the first house can be permitted. The MUD is the vehicle that lets the landowner build them and spread the cost over the homes that follow.

The scale is easy to underestimate. In the Texas Comptroller's 2025 special district data, 393 MUDs appear on the Harris County tax roll, 196 in Fort Bend County and 157 in Montgomery County. A district that crosses a county line appears in each county's count.

Since 2019 (HB 347), a Texas city can annex only at the owner's request or after a vote. A buyer in an ETJ district should not assume annexation will absorb it any time soon.

How a MUD is created

There are two routes. Most districts are created by the Texas Commission on Environmental Quality on a petition signed by the owners of a majority of the land by value (Water Code §54.014), after the TCEQ finds the project feasible, necessary and beneficial to the land (§54.021). Some are created by a special act of the Legislature.

Land inside a city or its extraterritorial jurisdiction needs the city's written consent (§54.016). If the city refuses or does not act for 90 days, the owners can ask it to provide water and sewer service instead, and if no service contract follows within 120 days, they can go to the TCEQ.

One recent change matters here. Since SB 2038 (2023), landowners can petition to be released from a city's ETJ, and land outside any ETJ needs no city consent for a new district. The platting guide for Houston covers what else that release changes.

How the developer gets repaid

The developer builds first and is repaid later. The district and the developer sign a reimbursement agreement before construction contracts are let, and TCEQ rules warn that facilities built before TCEQ approval carry no assurance of reimbursement (30 TAC §293.46).

Repayment comes from bonds, and a tax-backed MUD bond needs three approvals:

• The voters of the district, at a bond election (§54.505)
• The TCEQ, for utility and park bonds (§49.181)
• The Texas Attorney General (Government Code §1202.003)

Bonds are sold in series as the community builds out, not all at once. That makes the developer's MUD receivable real money that arrives slowly and conditionally, and a lender underwriting the project will treat it exactly that way.

The receivable also does not travel with the lots. When a developer sells lots to builders, the right to be reimbursed stays with whoever signed the reimbursement agreement unless that agreement is assigned. It belongs in every lot purchase contract, especially one where the builder finishes part of the work itself.

The rules that shape the deal

Three TCEQ rules decide how much comes back, and when.

The 30% rule (30 TAC §293.47). The developer generally funds at least 30% of the construction cost of water, wastewater, drainage and recreational facilities without reimbursement. Treatment plants, regional lines and regional detention are exempt, and the rule does not apply when the district's debt is 10% or less of its value or its bonds are rated investment grade.

Interest (30 TAC §293.50). Interest on the developer's advances is generally reimbursable for up to two years, at the lower of the bonds' net effective rate and the developer's own borrowing rate. None is paid on the developer's 30% share.

The first bond issue (30 TAC §293.59). Before a district's first bonds are advertised, the utilities they fund must be at least 95% complete, at least 25% of the projected home value must be built, and the projected tax rate must fit under a cap: $1.50 per $100 of value in 13 counties (Harris, Austin, Brazoria, Brazos, Chambers, Fort Bend, Galveston, Grimes, Liberty, Montgomery, Walker, Waller and Wharton), $1.20 in the Dallas–Fort Worth, Austin and San Antonio-area counties the rule lists, and $1.00 everywhere else. HB 2815 (2023) added six counties to the $1.50 list, and the TCEQ wrote them into the rule in 2026. That cap is visible in the data. The highest MUD rate on the 2025 Harris County roll is exactly $1.50.

Together they mean a developer should model three things separately: the 30% it never gets back, the interest that stops after two years, and the date the first issue can actually happen.

Roads and parks

Water, sewer and drainage are a MUD's core powers. Roads and parks need more.

A district can take on road powers by petitioning the TCEQ, and its road plans need city or county approval (§54.234). Road bonds need a two-thirds vote and are capped at one-quarter of the district's real property value under article III, section 52 of the Constitution.

Parks need their own election, and park debt is capped as a share of taxable value: 1%, or 3% where a district meets additional criteria (HB 1410, 2021).

So "what is reimbursable" is never a general answer. It depends on which powers the district holds and which bonds its voters approved.

What the buyer is told

Texas does not leave the MUD for the buyer to discover. Under Water Code §49.452, the seller must give a prescribed notice before the contract is signed. A buyer who did not receive it may be able to terminate, and the signed notice is recorded in the county records at closing.

Since 2023, there is one form for every kind of special taxing district, titled Notice to Purchaser of Special Taxing or Assessment District (§49.4521). It states the district's tax rate, the bonds authorized and issued by category (utilities, roads, parks), any standby fees, and whether the land is in a city's ETJ.

The rate itself is constrained in two ways. The tax that repays bonds has no rate limit (§54.601), but the maintenance tax needs voter approval (§49.107). And since SB 2 (2019), a developed district that raises its rate by more than 3.5% must hold an automatic election, while a developing district has an 8% threshold and an election only if voters petition for one.

What the tax does to a lot

The MUD tax is paid on top of county, city and school taxes, and buyers compare monthly payments, not tax rates.

The Harris County numbers show the spread. In the Comptroller's 2025 data, the median MUD rate was 54 cents per $100 of value, the middle half ran from 38 to 81 cents, and the full range ran from 3 cents to the $1.50 cap.

As an illustration: on a $400,000 home, every 10 cents per $100 is $400 a year. The gap between a 38-cent district and an 81-cent district is about $1,720 a year on that same home, which is a real difference in a monthly payment, and it competes directly with the lot price.

Young districts tend to carry higher rates, because a small tax base is carrying the first bonds. Rates often come down as homes are added, but nothing guarantees it, and the notice a buyer signs shows today's rate, not a forecast.

It is worth putting the rate in the listing rather than leaving it to the notice. A buyer comparing two communities will find it either way, and finding it late reads as hiding it.

MUD, PID, WCID, MMD

Texas has several special districts, and they are not interchangeable.

The one buyers most often confuse with a MUD is the PID: an assessment with a fixed amount and term rather than a tax rate set each year. Both can appear on the same purchaser notice form.

Where a map fits

A large community can sit in more than one district, and a section can move from "developing" to "developed" while the next one is still in its first bond issue. Which district a lot is in, and what its current rate is, belongs on the lot, not in a PDF the buyer meets at closing.

On an interactive plat map, each phase is shaded separately and every lot opens to its own record, so the district and its current rate can sit beside the lot size and status. The land developer view puts every section's phase on one page, and builders can show buyers the same detail on an interactive site map on the community page. The map does not change the tax. It stops a buyer from finding out about it last.

The Bottom Line

A MUD is a financing tool before it is a utility. The developer fronts the water, sewer and drainage, the district repays it through bonds, and the people who buy the lots pay those bonds off through a tax that every one of them is told about before signing.

For a developer, the numbers to model are the 30% that never comes back, the two-year limit on interest, and the date the first bond issue can realistically happen. For a builder, the number is the rate, because it sits in every buyer's monthly payment next to the price. For the finished-lot side of the same story, see what a finished lot is.