Did your facility renew its stormwater permit before the November 12, 2026, deadline? For facilities operating under a Notice of Intent (NOI), renewal under the Texas Commission on Environmental Quality’s (TCEQ) Multi-Sector General Permit (MSGP) is followed by ongoing inspections, monitoring, training, and reporting.
A stormwater compliance calendar can help facility personnel manage these responsibilities and keep the Stormwater Pollution Prevention Plan (SWP3) current. Facilities operating under a No Exposure Certification have different requirements.
Establish Your Facility’s Stormwater Compliance Calendar
Confirm your facility’s sector-specific requirements before adopting a quarterly inspection schedule. Certain industries require monthly, weekly, daily, or event-based inspections.
Review the primary and co-located activities identified in the NOI and SWP3 against Part V of the Texas MSGP, and document the applicable inspection and monitoring frequencies in the facility’s stormwater compliance calendar.
The following milestones summarize the general annual stormwater compliance timeline:
Throughout the Year: Stormwater Controls and SWP3 Updates
Maintain stormwater controls, address spills and corrective actions, and update the SWP3 as conditions change.
Complete inspections at the frequency required for the facility’s sectors. Maintain rainfall records at least weekly and daily during storm events, subject to applicable permit provisions.
Quarterly: Routine Stormwater Inspections and Visual Monitoring
Complete routine facility inspections at least quarterly unless a more frequent sector requirement or applicable permit exception applies.
Conduct visual monitoring of stormwater during a qualifying discharge and document the observations.
Semiannually: Stormwater Benchmark Sampling
Where benchmark sampling is required, collect samples during January through June and July through December, unless a valid waiver applies.
Benchmark sampling under the renewed permit begins in 2027.
Annually: Comprehensive Inspections, Training, and Monitoring
Complete the comprehensive site compliance inspection and prepare its signed and certified report within 30 days.
Conduct annual training for personnel responsible for SWP3 implementation.
Complete required annual monitoring before December 31, including hazardous metals and applicable impaired-waterbody monitoring unless a valid waiver or exception applies.
Confirm sector-specific analytical requirements separately, as some require more frequent sampling.
By March 31: Stormwater Monitoring Reports
Submit required analytical results through NetDMR by March 31 of the following year.
Reporting obligations depend on the monitoring type and results.
Additional Texas MSGP Compliance Requirements
Facilities must also complete the non-stormwater discharge investigation and certification within 180 days after submitting their renewal NOI.
How EDGE Can Help
EDGE Engineering & Science can assist with identifying applicable sector requirements, updating SWP3s, establishing stormwater compliance calendars, conducting inspections, coordinating sampling, providing employee training, and preparing required reporting.
