Waller County approves MS4 permit application, sells mobility bonds and clears local development, law-enforcement agreements

WALLER COUNTY, Texas — The Waller County Commissioners Court on Tuesday authorized the county to file a notice of intent (NOI) for coverage under the Texas Commission on Environmental Quality municipal separate storm sewer (MS4) general permit, approved sale of the county—s 2025 mobility bond tranche to BofA Securities at a lower-than-expected interest cost, and signed off on a series of development, road and interlocal law-enforcement measures.

The court voted to prepare and submit the MS4 NOI to TCEQ and to begin interlocal discussions with the Brookshire-Katy Drainage District and applicable municipal utility districts (MUDs) to share compliance duties. Commissioners also accepted a bid for the county—s mobility bond series 2025 and authorized contracts and payments tied to ongoing courthouse and justice-center construction.

County Engineer Ross explained the MS4 requirement to commissioners and described the scope of work the permit obliges the county to track and report. "A municipal separate storm sewer system, MS4, is basically anything that conveys storm water," Ross said, adding that the county falls inside the Houston urbanized area for the 2020 census and therefore meets TCEQ—s threshold for regulation. Ross told the court the program will require outreach, illicit discharge detection, construction stormwater controls and annual reporting to TCEQ.

Why it matters: the MS4 permit is a regulatory obligation under the federal Clean Water Act, implemented in Texas through TCEQ. It creates an ongoing compliance program that will require staff time, likely new resources in future budgets and coordination with drainage districts and MUDs where jurisdictions overlap.

Stormwater and next steps

Ross told the court the county was notified recently that it qualifies as a regulated MS4 due to inclusion in the Houston urbanized area and must file an NOI. He said the county could develop a stormwater management program in several months but emphasized staffing and budget consequences: the county will need to document public education, illicit discharge detection and construction-site controls and submit annual reports to TCEQ. "It's going to require people," Ross said. He recommended outreach to local drainage districts and MUDs to seek partnership and cost-sharing.

Commissioners…