Poet Biorefining - Groton

NPDES permit SD0027910 · Minor NON-POTW · administratively continued, expires 2019-09-30 · EPA's file as of 2026-09-19

Check this month's numbers before you file

This permit expired on 2019-09-30 and is administratively continued: 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

0values over a limit
0required values missing, on 0 form(s)
5of 19 forms filed late

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

Reporting

Reports are due about 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (60)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheit30DA AVG report only all year
001Temperature, water deg. fahrenheitDAILY MX <= 86 deg F all year
001Temperature, water deg. fahrenheitDAILY MX report only all year
001Temperature, water deg. fahrenheitDAILY MX report only all year
001Flow rate30DA AVG report only all year
001Flow rateDAILY MX report only all year
001Conductivity30DA AVG <= 2500 umho/cm all year
001ConductivityDAILY MX <= 4375 umho/cm all year
001Oxygen, dissolved [DO]DAILY MN >= 5 mg/L all year
001BOD, 5-day, 20 deg. C30DA AVG <= 10 mg/L all year
001BOD, 5-day, 20 deg. CDAILY MX <= 17.5 mg/L all year
001pHDAILY MN >= 6.5 SU all year
001pHDAILY MX <= 9 SU all year
001Alkalinity, total [as CaCO3]30DA AVG report only all year
001Alkalinity, total [as CaCO3]DAILY MX report only all year
001Solids, total suspended30DA AVG report only all year
001Solids, total suspendedDAILY MX report only all year
001Oil and grease, hexane extr methodDAILY MX <= 10 mg/L all year
001Nitrogen, ammonia total [as N]30DA AVG <= 1 mg/L Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 3.7 mg/L Jan, Feb, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 5.9 mg/L Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 7.2 mg/L Jan, Feb, Nov, Dec
001Nitrogen, nitrate total [as N]30DA AVG report only all year
001Nitrogen, nitrate total [as N]DAILY MX report only all year
001Hardness, total [as CaCO3]30DA AVG report only all year
001Hardness, total [as CaCO3]DAILY MX report only all year
001Arsenic, total recoverable30DA AVG report only all year
001Arsenic, total recoverableDAILY MX report only all year
001Selenium, total recoverable30DA AVG report only all year
001Selenium, total recoverableDAILY MX report only all year
001Nickel, total recoverable30DA AVG report only all year
001Nickel, total recoverableDAILY MX report only all year
001Silver total recoverable30DA AVG report only all year
001Silver total recoverableDAILY MX report only all year
001Zinc, total recoverable30DA AVG <= 388 ug/L all year
001Zinc, total recoverableDAILY MX <= 388 ug/L all year
001Cadmium, total recoverable30DA AVG report only all year
001Cadmium, total recoverableDAILY MX report only all year
001Lead, total recoverable30DA AVG report only all year
001Lead, total recoverableDAILY MX report only all year
001Chromium, total recoverable30DA AVG report only all year
001Chromium, total recoverableDAILY MX report only all year
001Copper, total recoverable30DA AVG <= 30.5 ug/L all year
001Copper, total recoverableDAILY MX <= 50 ug/L all year
001Molybdenum, total recoverable30DA AVG report only all year
001Molybdenum, total recoverableDAILY MX report only all year
001Temp. diff. between up/down stream deg. FDAILY MX <= 5 deg F all year
001Floating solids, waste or visible foam-visualDAILY MX <= 0 N=0;Y=1 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
001Chlorine, total residualDAILY MX <= .019 mg/L all year
001Flow, totalMO TOTAL report only all year
001Toxicity [acute], Ceriodaphnia dubiaDAILY MX <= 1 tox acute all year
001Toxicity [acute], Pimephales promelas [Fathead Minnow]DAILY MX <= 1 tox acute all year
001Solids, total dissolved30DA AVG <= 2500 mg/L all year
001Solids, total dissolvedDAILY MX <= 4375 mg/L all year
001Mercury, total recoverable30DA AVG report only all year
001Mercury, total recoverableDAILY MX report only all year
001Duration of dischargeMO TOTAL report only all year
001Oil and grease visualDAILY MX <= 0 N=0;Y=1 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