U.S. Fish and Wildlife Service - Norfork National Fish Hatchery

NPDES permit AR0002437 · Minor FEDERAL · effective, expires 2027-11-30 · 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.

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

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

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 25 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (37)

OutfallParameterStatisticLimitMonths
SUMOxygen, dissolved [DO]INST MIN >= 6 mg/L all year
SUMpHMINIMUM >= 6 SU all year
SUMpHMAXIMUM <= 9 SU all year
SUMSolids, total suspendedMO AVG <= 20 mg/L all year
SUMSolids, total suspendedDAILY MX <= 30 mg/L all year
SUMSolids, total suspendedMO AVG <= 6006 lb/d all year
SUMSolids, total suspendedDAILY MX <= 9010 lb/d all year
SUMNitrogen, ammonia total [as N]MO AVG <= 3 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
SUMNitrogen, ammonia total [as N]MO AVG <= 3 mg/L Jan, Feb, Mar, Nov, Dec
SUMNitrogen, ammonia total [as N]DAILY MX <= 3.9 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
SUMNitrogen, ammonia total [as N]DAILY MX <= 4.5 mg/L Jan, Feb, Mar, Nov, Dec
SUMNitrogen, ammonia total [as N]MO AVG <= 901 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
SUMNitrogen, ammonia total [as N]MO AVG <= 901 lb/d Jan, Feb, Mar, Nov, Dec
SUMNitrogen, ammonia total [as N]DAILY MX <= 1171 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
SUMNitrogen, ammonia total [as N]DAILY MX <= 1351 lb/d Jan, Feb, Mar, Nov, Dec
SUMFlow, in conduit or thru treatment plantMO AVG report only all year
SUMFlow, in conduit or thru treatment plantDAILY MX report only all year
SUMBOD, carbonaceous [5 day, 20 C]MO AVG <= 20 mg/L all year
SUMBOD, carbonaceous [5 day, 20 C]DAILY MX <= 30 mg/L all year
SUMBOD, carbonaceous [5 day, 20 C]MO AVG <= 6006 lb/d all year
SUMBOD, carbonaceous [5 day, 20 C]DAILY MX <= 9010 lb/d all year
TXSWhole effluent toxicity - retest #17 DA MIN report only all year
TXSWhole effluent toxicity - retest #27 DA MIN report only all year
TXSWET, sublethal retest #17 DA MIN report only all year
TXSWET, sublethal retest #27 DA MIN report only all year
TXSWhole Effluent Toxicity - Retest #37 DA MIN report only all year
TXSWhole Effluent Toxicity, Sub-Lethal Retest #37 DA MIN report only all year
TXSPass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TXSPass/Fail Static Renewal 7Day Chronic Pimephales promelas7 DA MIN report only all year
TXSLow Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TXSLow Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TXSNOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TXSNOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TXSNOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TXSNOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TXSCoef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TXSCoef Of Var Static Renewal 7Day Chronic Pimephales promelas7 DA MIN 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