GCC RIO GRANDE, INC.

NPDES permit NM0000116 · Minor NON-POTW · expired, expires 2026-05-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

This permit expired on 2026-05-31 and is expired: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

EPA's record, 2025-09-01 to 2026-08-31

5values over a limit
0required values missing, on 0 form(s)
2of 11 forms filed late

Last period with anything received: 2026-06-30. Most often over: Aluminum, total [as Al] (2), Copper, total [as Cu] (2), Solids, total suspended (1).

Reporting

Reports are due about 89 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (50)

OutfallParameterStatisticLimitMonths
001pHMINIMUM >= 6 SU all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspended30DA AVG report only all year
001Solids, total suspended30DA AVG report only all year
001Solids, total suspendedDAILY MX <= 50 mg/L all year
001Solids, total suspendedDAILY MX <= 50 mg/L all year
001Hardness, total [as CaCO3]DAILY MX report only all year
001Hardness, total [as CaCO3]DAILY MX report only all year
001Copper, dissolved [as Cu]30DA AVG report only all year
001Copper, dissolved [as Cu]30DA AVG report only all year
001Copper, dissolved [as Cu]DAILY MX report only all year
001Copper, dissolved [as Cu]DAILY MX report only all year
001Copper, total [as Cu]30DA AVG <= .011 ug/L all year
001Copper, total [as Cu]30DA AVG <= .011 ug/L all year
001Copper, total [as Cu]DAILY MX <= .011 ug/L all year
001Copper, total [as Cu]DAILY MX <= .011 ug/L all year
001Aluminum, total [as Al]30DA AVG <= .75 ug/L all year
001Aluminum, total [as Al]30DA AVG <= .75 ug/L all year
001Aluminum, total [as Al]DAILY MX <= .75 ug/L all year
001Aluminum, total [as Al]DAILY MX <= .75 ug/L all year
001Aluminum, total [as Al]30DA AVG <= .78 lb/d all year
001Aluminum, total [as Al]30DA AVG <= .78 lb/d all year
001Aluminum, total [as Al]DAILY MX <= .78 lb/d all year
001Aluminum, total [as Al]DAILY MX <= .78 lb/d all year
001Flow, in conduit or thru treatment plant30DA AVG report only all year
001Flow, in conduit or thru treatment plant30DA AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
TX1Whole effluent toxicity - retest #1VALUE report only all year
TX1Whole effluent toxicity - retest #2VALUE report only all year
TX1WET, sublethal retest #1VALUE report only all year
TX1WET, sublethal retest #2VALUE report only all year
TX1Whole Effluent Toxicity - Retest #3VALUE report only all year
TX1Whole Effluent Toxicity, Sub-Lethal Retest #3VALUE report only all year
TX1Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiaVALUE report only all year
TX1Pass/Fail Static Renewal 7Day Chronic Pimephales promelasVALUE report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubiaVALUE report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelasVALUE report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaVALUE report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelasVALUE report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaVALUE report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasVALUE report only all year
TX1Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubiaVALUE report only all year
TX1Coef Of Var Static Renewal 7Day Chronic Pimephales promelasVALUE report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubiaVALUE report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelasVALUE report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubiaVALUE report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelasVALUE report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states