Mission, TX Environmental Rules: Stormwater Management (2026)
Key Facts
- Governing law
- Ch. 114, Art. VIII (Ord. 4837)
- SWP3 required
- sites disturbing 1+ acres
- Full plan threshold
- 5+ acres of disturbance
- Penalty
- misdemeanor, each day separate offense
- Enforcement
- stop-work orders, city inspections
Summary
Mission bans polluted discharges into its MS4 storm sewer system and requires construction sites disturbing an acre or more of land to obtain a permit and file a stormwater pollution prevention plan before breaking ground.
It is the policy of the city, and the intent of this article, to reduce pollution and contamination entering the city's separate stormwater sewer system (MS4) to the greatest extent practicable. Discharges to the city's MS4 that cause or contribute to a violation of water quality standards or that fail to protect and maintain the aquatic life use of the Arroyo Colorado are hereby prohibited.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 31).
Full Breakdown
City Ordinance No. 4837 (2019) makes it unlawful to discharge anything but stormwater into Mission's separate storm sewer system (MS4) if it violates water quality standards or harms the Arroyo Colorado. Sites disturbing five or more acres need a full stormwater pollution prevention plan (SWP3) and TPDES notice of intent before permits issue; sites between one and five acres also need a SWP3 plus a site development or building permit. Sites under an acre must still contain soil and sediment on-site. City inspectors can enter and sample facilities, and violators face stop-work orders plus misdemeanor fines, with each day of violation a separate offense.
Violations & Fines
Discharging non-stormwater pollutants to the MS4, skipping a required SWP3, or interfering with a stop-work order is a misdemeanor; each day of continued violation counts as a separate offense.
Frequently Asked Questions
Does Mission require a permit for stormwater runoff from construction?
What happens if I violate Mission's stormwater rules?
Sources & Official References
Other rules in Mission
Texas rules heatmap·Compare Mission to another location·View the Texas environmental rules overview
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Stormwater Management in Nearby Cities
How other cities in Hidalgo County handle stormwater management.