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Clean Water Act discharge permit · NPDES TXR1583VP

MASON PH 1, San Marcos, TX: NPDES TXR1583VP discharge permit, effluent exceedances, inspections, penalties

MASON PH 1, held by Liberty Civil Construction, LLC, holds NPDES permit TXR1583VP, which discharges to Alligator Creek. EPA’s file records it issued August 21, 2025 and expiring March 4, 2028.

MASON PH 1, San Marcos, Texas: Coverage under a general permit TXR1583VP, held by Liberty Civil Construction, LLC; Construction stormwater; Effective; issued August 21, 2025, term to March 4, 2028; discharges to ALLIGATOR CREEK.

Texas holds 23,986 Construction stormwater coverages of this permit type in EPA’s file; 15,332 were issued before TXR1583VP. Liberty Civil Construction, LLC holds 45 permits in Texas.

Other permits held by Liberty Civil Construction, LLC

Coverages issued nearest TXR1583VP

MASON PH 1 among its neighbors

EPA’s permit file holds 50 discharge permits in the Middle York Creek subwatershed (HUC 121002030306), TXR1583VP among them. Its county holds 410, 3 of them major permits; TXR1583VP is a minor permit.

Other permits in the Middle York Creek subwatershed (HUC 121002030306)

  • COMAL ISD MIDDLE SCHOOL 9, New Braunfels: TXR1569RP, minor permit, discharging to ALLIGATOR CREEK, permit term to March 4, 2028
  • CONTINENTAL AUTOMOTIVE SYSTEMS, New Braunfels: TXR05GG20, minor permit, permit term to August 13, 2026
  • CREEKSIDE STATION WWTP, Zorn: TX0139688, minor permit, discharging to Lower San Marcos River, permit term to January 15, 2026
  • FRONTIER SAN MARCOS, San Marcos: TXR05GG89, minor permit, permit term to August 13, 2026
  • GRFC PLANT, San Marcos: TXG113987, minor permit, permit term to November 6, 2026
  • HERITAGE AT COTTONWOOD CREEK, San Marcos: TXR1569QQ, minor permit, discharging to LOWER SAN MARCOS RIVER, permit term to March 4, 2028
  • HUNTER CEMENT CLAY QUARRY, New Braunfels: TXR05GA55, minor permit, permit term to August 13, 2026
  • INDEPENDENCE TRIAL WWTP, San Marcos: TX0139131, minor permit, discharging to Lower San Marcos River, permit term to June 14, 2026
  • INGENIUM GROUP, San Marcos: TXRNEBW99, minor permit, permit term to August 13, 2026
  • MASON PH 1, San Marcos: TXR1509VP, minor permit, discharging to ALLIGATOR CREEK, permit term to March 4, 2028

What the register holds for MASON PH 1: its NPDES ID, its permit type and status, its dates, its address in San Marcos, Texas, its receiving water. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES TXR1583VP.

Identity

Facility as filedMASON PH 1
Permittee as filedLiberty Civil Construction, LLC
NPDES IDTXR1583VP
Permit statusEffective
Permit typeCoverage under a general permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
ProgramConstruction stormwater
IssuedAugust 21, 2025
Expiration dateMarch 4, 2028
AddressSan Marcos, TX 78666
Receiving waterALLIGATOR CREEK
SubwatershedMiddle York Creek (HUC 121002030306)
SIC1629 – Heavy Construction

Effluent limits and exceedances

EPA’s limits and effluent violation files hold no pollutant row for NPDES TXR1583VP.

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES TXR1583VP.

Inspections

EPA’s inspection file holds no inspection for NPDES TXR1583VP.

Formal enforcement and penalties

0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.

Informal enforcement

EPA’s informal enforcement file holds no action for NPDES TXR1583VP.

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, TXR1583VP.

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Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

What this page shows

MASON PH 1 is one of 50 storm water construction permits on EPA's NPDES register in the Middle York Creek subwatershed. Of the 336 storm water construction permits in Hays County, 55.7% have an earlier issue date than this permit. The permit has no pollutants under a numeric limit and no pollutants with an effluent exceedance.