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Clean Water Act discharge permit · NPDES TXR1525XM

PORTILLA SUBSTATION AND TRANSMISSION LINE PROJECT, Sinton, TX: NPDES TXR1525XM discharge permit, effluent exceedances, inspections, penalties

PORTILLA SUBSTATION AND TRANSMISSION LINE PROJECT, held by AEP Texas Inc., holds NPDES permit TXR1525XM, which discharges to Chiltipin Crk. EPA’s file records it issued February 27, 2026 and expiring March 4, 2028. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

What the register holds for PORTILLA SUBSTATION AND TRANSMISSION LINE PROJECT: its NPDES ID, its permit type and status, its dates, its address in Sinton, Texas, its receiving water. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES TXR1525XM.

Identity

Facility as filedPORTILLA SUBSTATION AND TRANSMISSION LINE PROJECT
Permittee as filedAEP Texas Inc.
NPDES IDTXR1525XM
Permit statusEffective
Permit typeCoverage under a general permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
ProgramConstruction stormwater
IssuedFebruary 27, 2026
Expiration dateMarch 4, 2028
AddressSinton, TX 78387
Receiving waterCHILTIPIN CRK
SubwatershedTown of Sinton-Chiltipin Creek (HUC 121004070304)

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

EPA’s limits and effluent violation files hold no pollutant row for NPDES TXR1525XM.

Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES TXR1525XM.

Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.

Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.

Watch this permit

One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, TXR1525XM.

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How often?
  • One permit holder — $99/month
  • One watershed — $2,990/year
  • One state — $4,990/year
  • The whole register — $18,000/year

How we handle your data → Privacy

EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID TXR1525XM there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

What this page shows

The PORTILLA SUBSTATION AND TRANSMISSION LINE PROJECT is one of 58 storm water construction permits in San Patricio County, and 75.9% of those 58 were issued earlier than this one. It sits among 14 NPDES permits in the Town of Sinton-Chiltipin Creek subwatershed, this one included. None of the 58 San Patricio County storm water construction permits, this one included, has a violation on file, which is 0.0%.