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Rosenberg hires Quiddity to update groundwater-reduction plan as subsidence rules tighten
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Summary
The Rosenberg City Council approved a $89,000 contract with Quiddity Engineering to update the city’s Groundwater Reduction Plan to comply with amended subsidence-district rules that limit groundwater use and to inform future capital planning and permit reporting.
The Rosenberg City Council on a voice vote authorized resolution R‑4029, hiring Quiddity Engineering LLC for an $89,000 update to the city’s Groundwater Reduction Plan (GRP) to align Rosenberg with recently amended subsidence-district rules.
City staff presented Quiddity’s scope: update demand-and-supply projections, examine conservation and reuse options, evaluate use of groundwater credits and outline capital improvements needed to meet the subsidence-district’s new limits. "Currently, the city is required to limit ground water use to no more than 70% of their total water usage," Quiddity representative Charlie Kalkome told the council, adding that under the district’s new plan the city may be required to reduce groundwater use to "no more than 40% of total water usage by the year 2030."
The contract is intended to prepare Rosenberg for reporting requirements tied to future permit renewals and to guide capital improvements and budgeting. Staff noted the $89,000 fee covers the planning and modeling work but "would not include a reservoir study," a larger undertaking that would require separate funding. Kalkome said the study will consider surface-water options, reuse expansion and conservation measures and will outline likely capital needs.
Council members asked about rate impacts and regional supply. Kalkome said the city will reassess rates as it shifts supply sources: "We probably will have an increase in rates because we'll be paying BWA more water, more money," he said, referring to the Brazosport Water Authority. He also told the council that BWA is pursuing capacity projects — including a third reservoir and desalination testing — that could increase surface-water availability.
Staff said the project is partially funded in the FY26 budget and that a future budget adjustment will cover remaining costs. The council approved resolution R‑4029 as presented; staff will return with any budget amendments and report milestones as required by the subsidence district.
The update is intended to clarify how Rosenberg will meet tighter subsidence limits, the timeline for required improvements and the likely cost and rate implications for residents.
