Environmental Rules in San Antonio, TX (2026)
6 verified environmental rules for San Antonio, Texas, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
San Antonio bans dumping acids, oils, paint, automotive fluids, pesticides and other pollutants into the city's Municipal Separate Storm Sewer System (MS4) under Code of Ordinances Sec. 34-702. SAWS-designated inspectors enforce the rule against every storm drain, ditch, creek, or gutter feeding the MS4, with criminal fines up to $2,000 per day and civil penalties reaching $5,000 per violation.
San Antonio MS4 Stormwater Discharge Ban
Heavy RestrictionsSan Antonio Code of Ordinances Sec. 34-702
It shall be a violation of this division for any person to deposit, throw, drain, discharge, cause or allow to be deposited, thrown, drained or discharged, or otherwise cause to be injected into the MS4, or any storm sewer manhole, catch basin, private drain, ditch, street, gutter, creek, stream, tributary, or any other drainage device which connects with or drains into the MS4, any of the foll...
Erosion Control
San Antonio's UDC requires property developers to manage all stormwater flowing through their property, including drainage from upstream development. The Storm Water Design Criteria Manual (Jan 2016) governs design standards. The Edwards Aquifer Protection Ordinance (Chapter 34, Div. 6) limits impervious cover to 15% for residential development on the Recharge Zone and prohibits impervious cover in floodplain buffer zones.
San Antonio Grading & Drainage Rules
Light RestrictionsTex. Local Government Code Sec. 232.003 (Subdivision Requirements - Drainage Specifications)
Sec. 232.003. SUBDIVISION REQUIREMENTS. By an order adopted and entered in the minutes of the commissioners court, and after a notice is published in a newspaper of general circulation in the county, the commissioners court may:(1) require a right-of-way on a street or road that functions as a main artery in a subdivision, of a width of not less than 50 feet or more than 100 feet;(2) requir...
Flood Zones
Within the Edwards Aquifer Recharge Zone, San Antonio Code Sec. 34-912 bans nearly all construction in designated floodplain preservation areas covering watersheds over 100 acres. The San Antonio Water System requires a letter of certification before any development, and only listed exceptions like street crossings, utilities, fences, and park trails are allowed.
San Antonio EARZ Floodplain Preservation Rules
Significant RestrictionsSan Antonio Code of Ordinances Sec. 34-912
Minor, intermediate and major floodplain shall be designated for any channel, creek, stream, branch, or watercourse within the Edwards Aquifer Recharge Zone having a watershed greater than one hundred (100) acres...The floodplain delineation shall be based on a 100-year frequency, a channel in its unaltered state, and shall assume conditions consistent with the City of San Antonio floodplain re...
Vehicle Idling Restrictions
Bexar County opted into TCEQ Rule 30 TAC 114.512, prohibiting commercial vehicles over 14,000 pounds GVWR from idling more than five consecutive minutes when temperatures fall between 40 and 90 degrees, with several work-related exemptions.
Bexar County TCEQ Idling Rule Limits Heavy Vehicles
Light RestrictionsTex. Health & Safety Code § 382.0518
(a) Before work is begun on the construction of a new facility or a modification of an existing facility that may emit air contaminants, the person planning the construction or modification must obtain a permit or permit amendment from the commission.(b) The commission shall grant within a reasonable time a permit or permit amendment to construct or modify a facility if, from the information av...
Cool Roof Requirements
San Antonio adopted the IECC with local amendments through SAMC Chapter 10, requiring high-reflectance and high-emissivity roofing on low-slope commercial and multifamily roofs in climate zone 2A, reducing cooling loads and urban heat island effect.
San Antonio Energy Code Cool Roof Standards
Some RestrictionsTex. Health & Safety Code § 388.003
(a) To achieve energy conservation in single-family residential construction, the energy efficiency chapter of the International Residential Code, as it existed on May 1, 2001, is adopted as the energy code in this state for single-family residential construction. On September 1, 2016, the energy efficiency chapter of the International Residential Code, as it existed on May 1, 2015, is adopted ...
Flood Elevation Requirements
San Antonio's Unified Development Code requires new construction and substantially improved structures in the regulatory floodplain to sit at least one foot above the base flood elevation. Habitable buildings need finished floors elevated that one foot of freeboard, and owners must file pre-construction and post-construction elevation certificates with the Floodplain Administrator before a permit is approved and before final inspection.
San Antonio Flood Elevation and Freeboard Requirements
Some RestrictionsSan Antonio Unified Development Code Sec. 35-F142 (Specific Standards)
In all areas of special flood hazards where base flood elevation data has been provided in accordance with this ordinance, the following provisions are required: (a)Residential and Other Habitable Construction.(1)Work on habitable structures within the FEMA effective and regulatory floodplain may be allowed as follows:...B.Rehabilitation, repair, or addition that constitutes a substantial impro...
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County ordinances apply to unincorporated areas and may supplement San Antonio city rules.
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