Clean Water Act discharge permit · NPDES TXR1519OU

SIENNA MUD 10 TRAILS, Missouri City, TX: NPDES TXR1519OU discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
0Pollutants under a numeric limit
0Pollutants with an effluent exceedance

SIENNA MUD 10 TRAILS, held by Mills Equipment, LLC, holds NPDES permit TXR1519OU, which discharges to Upper Oyster Creek. EPA’s file records it issued October 24, 2023 and expiring March 4, 2028. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

What the register holds for SIENNA MUD 10 TRAILS: its NPDES ID, its permit type and status, its dates, its address in Missouri City, Texas, its receiving water. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES TXR1519OU.

Identity

Facility as filed	SIENNA MUD 10 TRAILS
Permittee as filed	Mills Equipment, LLC
NPDES ID	TXR1519OU
Permit status	Effective
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Program	Construction stormwater
Issued	October 24, 2023
Expiration date	March 4, 2028
Address	Missouri City, TX 77459
Receiving water	UPPER OYSTER CREEK
Subwatershed	Steep Bank Creek-Brazos River (HUC 120701040403)
SIC	1629 – Heavy Construction

Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.

Effluent limits and exceedances

0Pollutants on file
0Under a numeric limit
0With a violation of any kind
0With an effluent exceedance

EPA’s limits and effluent violation files hold no pollutant row for NPDES TXR1519OU.

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

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES TXR1519OU.

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, TXR1519OU.

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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 TXR1519OU there.

Nearby on the register

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

The permit issued to Mills Equipment, LLC under the name SIENNA MUD 10 TRAILS, in Missouri City, Fort Bend County, Texas, is one of 716 storm water construction permits in its county on EPA's NPDES register. Among those 716 permits, 0.4% have a violation on file, and this permit has none of the records for pollutants under a numeric limit or effluent exceedances, each counted as 0. Its issue date falls earlier than that of 7.5% of the county's storm water construction permits, and it is one of 38 NPDES permits in the Steep Bank Creek-Brazos River subwatershed.