Round Rock's Environmental Rules: The Rules That Matter

Every city handles environmental rules a little differently. In Round Rock, Texas, there are 3 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

Erosion Control

Round Rock requires an erosion and sedimentation control plan for any permitted construction, and a full Storm Water Pollution Prevention Plan once a project disturbs more than one acre, under the city's Drainage Criteria Manual.

Key details: Governing document: Round Rock Drainage Criteria Manual, Section 9. SWPPP threshold: Required for disturbance over 1 acre. Applies to: All construction disturbing land, permitted or not. Engineer certification: Licensed PE must certify BMP calculations. State tie-in: Must comply with TPDES permit TXR150000.

Reviewers can deny a plan lacking adequate BMP calculations, and inspectors can order field revisions or a full plan resubmittal for controls that fail during construction.

Flood Elevation Requirements

Round Rock requires any structure built on a lot within or adjacent to the 100-year floodplain to have its finished floor slab set at least one foot above the 100-year flood level, fixed on the final subdivision plat.

Key details: Freeboard: One foot above 100-year flood. Code section: § 14-119(c). Applies to: Lots in/near 100-year floodplain. Fixed by: Final subdivision plat. Enforced by: Planning & Development Services.

A final plat lacking certified minimum slab elevations will not be approved, and the city withholds building permits and the certificate of occupancy until the design engineer certifies drainage and elevation compliance.

Stormwater Management

Round Rock requires all new drainage systems to handle the 25-year storm in curbs and storm sewers, with the citywide system built to convey up to a 100-year event.

Key details: Minor storm design: 25-year storm, curbs/gutters/sewers. Major storm design: 100-year storm, public drainage system. Governing document: Drainage Criteria Manual, Section 1. Reviewing authority: Engineering and Development Services Department.

Plans that don't meet the 25-year/100-year storm standards are rejected by Engineering and Development Services; noncompliant construction can void plat approval and building permits.

The Bottom Line

Round Rock's environmental rules rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Round Rock is broadly strict or permissive.

All of the above reflects Round Rock's municipal code as of our last review. If you need specifics on fines, exemptions, or filing requirements, the detailed ordinance pages linked above have the full breakdown.