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What does NBU’s $126 million Gruene wastewater expansion buy?

NBU’s planned expansion would add 2.4 million gallons a day of wastewater treatment capacity for New Braunfels customers; its next project-level financing record will matter to any estimate of customer costs.

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Blue line illustration of wastewater tanks and pipes beside a dashed outline of additional treatment structures, surrounded by scrub vegetation.
Illustration: A conceptual wastewater treatment plant expansion; this does not depict the reported project site.Original editorial illustration; not a photograph and does not depict the reported event or an exact property.Comal.News Visual Desk · Original illustration · Source ↗ · Comal.News original illustration ↗

NBU has outlined a $126 million Gruene wastewater expansion that would lift treatment capacity from 2.5 million to 4.9 million gallons a day.

For New Braunfels wastewater customers, that would mean 2.4 million gallons a day of additional planned treatment capacity if the project is completed. NBU’s Oct. 2 project announcement describes the expansion as a response to wastewater needs as the service area grows.

The public figures answer what the enlarged plant is intended to handle. They do not assign the project’s cost among current customer rates, borrowing, development impact fees and other sources. That assignment matters because each source places a different share of the cost on customers now, customers later or new development. The figures below describe the scale and timing of NBU’s plan; none is a household bill estimate.

What the numbers measure

NBU describes about $81 million of the project as budgeted over five years. The $126 million figure describes the whole-project budget; the five-year figure describes a planning window. Their difference should not be treated as a cost overrun or assigned to a later year without a project-level schedule. NBU’s financial plan is the primary record for the utility’s broader capital program.

NBU’s stated Gruene project figures, October 2026
FigureWhat it measuresWhat it does not measure
$126 millionWhole-project budgetAn annual cost or household bill
About $81 millionAmount NBU says is budgeted over five yearsThe whole-project total
2.5 MGDStated starting treatment capacityCapacity added by the project
4.9 MGDPlanned total treatment capacityCapacity already delivered

MGD means million gallons per day. Budget and capacity figures come from NBU’s project announcement; they describe a plan.

NBU separately lists $20.7 million for Gruene among its FY 2026–27 projects. Its Your Rates at Work page puts that figure in a shorter project-listing period than the five-year amount. Reading the figures together requires their distinct time spans: the near-term listing is a planning figure, not a second whole-project budget.

Who could pay

NBU’s FY 2027 financial plan lists debt, impact fees, contributions and grants, Texas Water Development Board funds, and revenue and excess funds as sources for the utility-wide capital program. Those categories show the financing tools in NBU’s broader plan. They are not a Gruene-only allocation, so the utility-wide amounts cannot be read as the expansion’s funding split.

NBU-wide FY 2027 capital funding listed in the financial plan
Funding categoryAmount
Debt$190.1 million
Impact fees$19.2 million
Contributions and grants$4.5 million
Texas Water Development Board$5.6 million
Revenue and excess funds$24.8 million

These are utility-wide capital funding amounts, not amounts assigned to Gruene.

The distinction affects how residents can judge the expansion. More treatment capacity could serve additional wastewater demand. The financing choice determines when costs come due and which funding sources NBU plans to use. A project-level funding schedule would allow readers to compare those choices with the announced capacity gain instead of applying utility-wide percentages to one facility.

The next record

The next useful document is NBU’s Gruene capital-project detail showing planned funding sources and year-by-year cash flows. It could connect the whole-project budget, the five-year allocation and the near-term listing, and provide a basis for assessing any customer cost estimate. Readers can inspect NBU’s announced project scope in the project announcement and its broader financing categories in the FY 2027 financial plan.

From the source record

NBU’s stated current and planned Gruene Water Reclamation Facility treatment capacity.Source: NBU’s Oct. 2 project announcement.

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