Tiffin Water Pollution Control Center

NPDES permit OH0052949 · Major POTW · administratively continued, expires 2026-04-30 · 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.

This permit expired on 2026-04-30 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

1values over a limit
0required values missing, on 0 form(s)
0of 135 forms filed late

Last period with anything received: 2026-07-31. Most often over: Phosphorus, total [as P] (1).

Reporting

Reports are due about 20 days after each monitoring period ends (the most common figure among OH permits in EPA's filings — check your permit).

Limits in force (260)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeMO AVG report only all year
001Temperature, water deg. centigradeDAILY MX report only all year
001Oxygen, dissolved [DO]DAILY MN >= 5 mg/L all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedWKLY MAX <= 45 mg/L all year
001Solids, total suspendedMO AVG <= 455 kg/d all year
001Solids, total suspendedWKLY MAX <= 682 kg/d all year
001Oil and grease, hexane extr methodDAILY MX <= 10 mg/L all year
001Nitrogen, ammonia total [as N]MO AVG <= 1.1 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 12.9 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]WKLY MAX <= 1.7 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]WKLY MAX <= 19.4 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 16.7 kg/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 195 kg/d Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]WKLY MAX <= 25.8 kg/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]WKLY MAX <= 294 kg/d Jan, Feb, Mar, Apr, Nov, Dec
001Nitrite + Nitrate total [as N]MO AVG report only all year
001Nitrite + Nitrate total [as N]DAILY MX report only all year
001Phosphorus, total [as P]MO AVG <= 1 mg/L all year
001Phosphorus, total [as P]WKLY MAX <= 1.5 mg/L all year
001Phosphorus, total [as P]MO AVG <= 15 kg/d all year
001Phosphorus, total [as P]WKLY MAX <= 23 kg/d all year
001Phosphate, ortho, dissolved [as P]MO AVG report only all year
001Phosphate, ortho, dissolved [as P]DAILY MX report only all year
001Nickel, total recoverableMO AVG report only Mar, Jun, Aug, Dec
001Nickel, total recoverableDAILY MX report only Mar, Jun, Aug, Dec
001Zinc, total recoverableMO AVG report only Mar, Jun, Aug, Dec
001Zinc, total recoverableDAILY MX report only Mar, Jun, Aug, Dec
001Cadmium, total recoverableMO AVG report only Mar, Jun, Aug, Dec
001Cadmium, total recoverableDAILY MX report only Mar, Jun, Aug, Dec
001Lead, total recoverableMO AVG report only Mar, Jun, Aug, Dec
001Lead, total recoverableDAILY MX report only Mar, Jun, Aug, Dec
001Chromium, total recoverableMO AVG report only Mar, Jun, Aug, Dec
001Chromium, total recoverableDAILY MX report only Mar, Jun, Aug, Dec
001Copper, total recoverableMO AVG <= 29 ug/L all year
001Copper, total recoverableDAILY MX <= 68 ug/L all year
001Copper, total recoverableMO AVG <= .44 kg/d all year
001Copper, total recoverableDAILY MX <= 1.03 kg/d all year
001Chromium, hexavalent dissolved [as Cr]MO AVG report only Mar, Jun, Aug, Dec
001Chromium, hexavalent dissolved [as Cr]DAILY MX report only Mar, Jun, Aug, Dec
001E. coli, MTEC-MFMO GEOMN <= 126 MPN/100mL May, Jun, Jul, Aug, Sep, Oct
001E. coli, MTEC-MFWK GEOMN <= 284 MPN/100mL May, Jun, Jul, Aug, Sep, Oct
001Di[2-ethylhexyl] phthalate [DEHP]MO AVG <= 11 ug/L all year
001Di[2-ethylhexyl] phthalate [DEHP]DAILY MX <= 1967 ug/L all year
001Di[2-ethylhexyl] phthalate [DEHP]MO AVG <= .167 kg/d all year
001Di[2-ethylhexyl] phthalate [DEHP]DAILY MX <= 29.8 kg/d all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Mercury, total low levelMO AVG <= 2.8 ng/L all year
001Mercury, total low levelDAILY MX <= 1700 ng/L all year
001Mercury, total low levelMO AVG <= .000043 kg/d all year
001Mercury, total low levelDAILY MX <= .0258 kg/d all year
001Cyanide, free availableMO AVG <= 6.6 ug/L all year
001Cyanide, free availableDAILY MX <= 39 ug/L all year
001Cyanide, free availableMO AVG <= .1 kg/d all year
001Cyanide, free availableDAILY MX <= .591 kg/d all year
001Toxicity [acute], Ceriodaphnia dubiaMO AVG report only May
001Toxicity [acute], Ceriodaphnia dubiaDAILY MX report only May
001Toxicity [chronic], Ceriodaphnia dubiaMO AVG report only May
001Toxicity [chronic], Ceriodaphnia dubiaDAILY MX report only May
001Toxicity [acute], Pimephales promelas [Fathead Minnow]MO AVG report only May
001Toxicity [acute], Pimephales promelas [Fathead Minnow]DAILY MX report only May
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]MO AVG report only May
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]DAILY MX report only May
001pH, maximumDAILY MX <= 9 SU all year
001pH, minimumDAILY MN >= 6.5 SU all year
001Solids, total dissolved- 180 deg. CMO AVG report only all year
001Solids, total dissolved- 180 deg. CDAILY MX report only all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L all year
001BOD, carbonaceous [5 day, 20 C]WKLY MAX <= 40 mg/L all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 379 kg/d all year
001BOD, carbonaceous [5 day, 20 C]WKLY MAX <= 606 kg/d all year
002Solids, total suspendedMO AVG report only all year
002Solids, total suspendedDAILY MX report only all year
002Bypass VolumeMO AVG report only all year
002Bypass VolumeDAILY MX report only all year
002BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
002BOD, carbonaceous [5 day, 20 C]DAILY MX report only all year
002Bypass valveMO AVG report only all year
002Bypass valveDAILY MX report only all year
002Bypass of treatmentMO AVG report only all year
002Bypass of treatmentDAILY MX report only all year
005OverflowsMO AVG report only all year
005OverflowsDAILY MX report only all year
005Overflow volume [SS0 volume, CSO volume]MO AVG report only all year
005Overflow volume [SS0 volume, CSO volume]DAILY MX report only all year
009OverflowsMO AVG report only all year
009OverflowsDAILY MX report only all year
009Overflow volume [SS0 volume, CSO volume]MO AVG report only all year
009Overflow volume [SS0 volume, CSO volume]DAILY MX report only all year
010OverflowsMO AVG report only all year
010OverflowsDAILY MX report only all year
010Overflow volume [SS0 volume, CSO volume]MO AVG report only all year
010Overflow volume [SS0 volume, CSO volume]DAILY MX report only all year
011OverflowsMO AVG report only all year
011OverflowsDAILY MX report only all year
011Overflow volume [SS0 volume, CSO volume]MO AVG report only all year
011Overflow volume [SS0 volume, CSO volume]DAILY MX report only all year
012OverflowsMO AVG report only all year
012OverflowsDAILY MX report only all year
012Overflow volume [SS0 volume, CSO volume]MO AVG report only all year
012Overflow volume [SS0 volume, CSO volume]DAILY MX report only all year
013OverflowsMO AVG report only all year
013OverflowsDAILY MX report only all year
013Overflow volume [SS0 volume, CSO volume]MO AVG report only all year
013Overflow volume [SS0 volume, CSO volume]DAILY MX report only all year
014OverflowsMO AVG report only all year
014OverflowsDAILY MX report only all year
014Overflow volume [SS0 volume, CSO volume]MO AVG report only all year
014Overflow volume [SS0 volume, CSO volume]DAILY MX report only all year
015OverflowsMO AVG report only all year
015OverflowsDAILY MX report only all year
015Overflow volume [SS0 volume, CSO volume]MO AVG report only all year
015Overflow volume [SS0 volume, CSO volume]DAILY MX report only all year
016OverflowsMO AVG report only all year
016OverflowsDAILY MX report only all year
016Overflow volume [SS0 volume, CSO volume]MO AVG report only all year
016Overflow volume [SS0 volume, CSO volume]DAILY MX report only all year
017OverflowsMO AVG report only all year
017OverflowsDAILY MX report only all year
017Overflow volume [SS0 volume, CSO volume]MO AVG report only all year
017Overflow volume [SS0 volume, CSO volume]DAILY MX report only all year
018OverflowsMO AVG report only all year
018OverflowsDAILY MX report only all year
018Overflow volume [SS0 volume, CSO volume]MO AVG report only all year
018Overflow volume [SS0 volume, CSO volume]DAILY MX report only all year
019OverflowsMO AVG report only all year
019OverflowsDAILY MX report only all year
019Overflow volume [SS0 volume, CSO volume]MO AVG report only all year
019Overflow volume [SS0 volume, CSO volume]DAILY MX report only all year
020OverflowsMO AVG report only all year
020OverflowsDAILY MX report only all year
020Overflow volume [SS0 volume, CSO volume]MO AVG report only all year
020Overflow volume [SS0 volume, CSO volume]DAILY MX report only all year
021OverflowsMO AVG report only all year
021OverflowsDAILY MX report only all year
021Overflow volume [SS0 volume, CSO volume]MO AVG report only all year
021Overflow volume [SS0 volume, CSO volume]DAILY MX report only all year
023OverflowsMO AVG report only all year
023OverflowsDAILY MX report only all year
023Overflow volume [SS0 volume, CSO volume]MO AVG report only all year
023Overflow volume [SS0 volume, CSO volume]DAILY MX report only all year
025OverflowsMO AVG report only all year
025OverflowsDAILY MX report only all year
025Overflow volume [SS0 volume, CSO volume]MO AVG report only all year
025Overflow volume [SS0 volume, CSO volume]DAILY MX report only all year
027OverflowsMO AVG report only all year
027OverflowsDAILY MX report only all year
027Overflow volume [SS0 volume, CSO volume]MO AVG report only all year
027Overflow volume [SS0 volume, CSO volume]DAILY MX report only all year
028OverflowsMO AVG report only all year
028OverflowsDAILY MX report only all year
028Overflow volume [SS0 volume, CSO volume]MO AVG report only all year
028Overflow volume [SS0 volume, CSO volume]DAILY MX report only all year
030OverflowsMO AVG report only all year
030OverflowsDAILY MX report only all year
030Overflow volume [SS0 volume, CSO volume]MO AVG report only all year
030Overflow volume [SS0 volume, CSO volume]DAILY MX report only all year
031OverflowsMO AVG report only all year
031OverflowsDAILY MX report only all year
031Overflow volume [SS0 volume, CSO volume]MO AVG report only all year
031Overflow volume [SS0 volume, CSO volume]DAILY MX report only all year
033OverflowsMO AVG report only all year
033OverflowsDAILY MX report only all year
033Overflow volume [SS0 volume, CSO volume]MO AVG report only all year
033Overflow volume [SS0 volume, CSO volume]DAILY MX report only all year
037OverflowsMO AVG report only all year
037OverflowsDAILY MX report only all year
037Overflow volume [SS0 volume, CSO volume]MO AVG report only all year
037Overflow volume [SS0 volume, CSO volume]DAILY MX report only all year
050OverflowsMO AVG report only all year
050OverflowsDAILY MX report only all year
050Overflow volume [SS0 volume, CSO volume]MO AVG report only all year
050Overflow volume [SS0 volume, CSO volume]DAILY MX report only all year
051OverflowsMO AVG report only all year
051OverflowsDAILY MX report only all year
051Overflow volume [SS0 volume, CSO volume]MO AVG report only all year
051Overflow volume [SS0 volume, CSO volume]DAILY MX report only all year
300OverflowsMO AVG report only all year
300OverflowsDAILY MX report only all year
581Nitrogen, ammonia in bottom depositsMO AVG report only Mar, Jun, Sep, Dec
581Nitrogen, ammonia in bottom depositsDAILY MX report only Mar, Jun, Sep, Dec
581Nitrogen, Kjeldahl, total [as N]MO AVG report only Mar, Jun, Sep, Dec
581Nitrogen, Kjeldahl, total [as N]DAILY MX report only Mar, Jun, Sep, Dec
581Phosphorous, total, in bottom depositsMO AVG report only Mar, Jun, Sep, Dec
581Phosphorous, total, in bottom depositsDAILY MX report only Mar, Jun, Sep, Dec
581Potassium, in bottom depositsMO AVG report only Mar, Jun, Sep, Dec
581Potassium, in bottom depositsDAILY MX report only Mar, Jun, Sep, Dec
581Arsenic, dry weightDAILY MX <= 75 mg/kg Mar, Jun, Sep, Dec
581Cadmium, in bottom deposits [dry wgt]DAILY MX <= 85 mg/kg Mar, Jun, Sep, Dec
581Copper in bottom deposits [dry wgt]DAILY MX <= 4300 mg/kg Mar, Jun, Sep, Dec
581Lead, total dry weight [as Pb]DAILY MX <= 840 mg/kg Mar, Jun, Sep, Dec
581Nickel, tot in bottom deposits [dry wgt]DAILY MX <= 420 mg/kg Mar, Jun, Sep, Dec
581Zinc in bottom deposits [dry wgt]DAILY MX <= 7500 mg/kg Mar, Jun, Sep, Dec
581Selenium, dry weightDAILY MX <= 100 mg/kg Mar, Jun, Sep, Dec
581Biosolids weight indluding admixturesMO AVG report only Mar, Jun, Sep, Dec
581Biosolids weight indluding admixturesDAILY MX report only Mar, Jun, Sep, Dec
581Sludge weight, dryMO AVG report only Mar, Jun, Sep, Dec
581Sludge weight, dryDAILY MX report only Mar, Jun, Sep, Dec
581Mercury, tot in bot deposits [dry wgt]DAILY MX <= 57 mg/kg Mar, Jun, Sep, Dec
581Molybdenum, sludge, total, dry weight [as Mo]DAILY MX <= 75 mg/kg Mar, Jun, Sep, Dec
586Biosolids weight indluding admixturesMO AVG report only Dec
586Biosolids weight indluding admixturesDAILY MX report only Dec
601Solids, total suspendedMO AVG report only all year
601Solids, total suspendedDAILY MX report only all year
601Cyanide, total [as CN]MO AVG report only all year
601Cyanide, total [as CN]DAILY MX report only all year
601Nickel, total recoverableMO AVG report only Mar, Jun, Aug, Dec
601Nickel, total recoverableDAILY MX report only Mar, Jun, Aug, Dec
601Zinc, total recoverableMO AVG report only Mar, Jun, Aug, Dec
601Zinc, total recoverableDAILY MX report only Mar, Jun, Aug, Dec
601Cadmium, total recoverableMO AVG report only Mar, Jun, Aug, Dec
601Cadmium, total recoverableDAILY MX report only Mar, Jun, Aug, Dec
601Lead, total recoverableMO AVG report only Mar, Jun, Aug, Dec
601Lead, total recoverableDAILY MX report only Mar, Jun, Aug, Dec
601Chromium, total recoverableMO AVG report only Mar, Jun, Aug, Dec
601Chromium, total recoverableDAILY MX report only Mar, Jun, Aug, Dec
601Copper, total recoverableMO AVG report only all year
601Copper, total recoverableDAILY MX report only all year
601Chromium, hexavalent dissolved [as Cr]MO AVG report only Mar, Jun, Aug, Dec
601Chromium, hexavalent dissolved [as Cr]DAILY MX report only Mar, Jun, Aug, Dec
601Di[2-ethylhexyl] phthalate [DEHP]MO AVG report only all year
601Di[2-ethylhexyl] phthalate [DEHP]DAILY MX report only all year
601Mercury, total low levelMO AVG report only all year
601Mercury, total low levelDAILY MX report only all year
601pH, maximumDAILY MX report only all year
601pH, minimumDAILY MN report only all year
601BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
601BOD, carbonaceous [5 day, 20 C]DAILY MX report only all year
801Nitrogen, ammonia total [as N]MO AVG report only all year
801Nitrogen, ammonia total [as N]DAILY MX report only all year
801Nitrite + Nitrate total [as N]MO AVG report only all year
801Nitrite + Nitrate total [as N]DAILY MX report only all year
801Phosphorus, total [as P]MO AVG report only all year
801Phosphorus, total [as P]DAILY MX report only all year
801E. coli, MTEC-MFMO GEOMN report only Jun, Jul, Aug
801E. coli, MTEC-MFDAILY MX report only Jun, Jul, Aug
801%Effect Static Renewal 48Hr Acute Ceriodaphnia dubiaMO AVG report only May
801%Effect Static Renewal 48Hr Acute Ceriodaphnia dubiaDAILY MX report only May
801%Effect Static Renewal 96Hr Acute Pimephales promelasMO AVG report only May
801%Effect Static Renewal 96Hr Acute Pimephales promelasDAILY MX report only May
801%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AVG report only May
801%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MX report only May
801%Effect Static Renewal 7Day Chronic Pimephales promelasMO AVG report only May
801%Effect Static Renewal 7Day Chronic Pimephales promelasDAILY MX report only May
901Temperature, water deg. centigradeMO AVG report only all year
901Temperature, water deg. centigradeDAILY MX report only all year
901Oxygen, dissolved [DO]DAILY MN report only all year
901pHDAILY MN report only all year
901pHDAILY MX report only all year
901Nitrogen, ammonia total [as N]MO AVG report only all year
901Nitrogen, ammonia total [as N]DAILY MX report only all year
901Nitrite + Nitrate total [as N]MO AVG report only all year
901Nitrite + Nitrate total [as N]DAILY MX report only all year
901Phosphorus, total [as P]MO AVG report only all year
901Phosphorus, total [as P]DAILY MX report only all year
901Hardness, total [as CaCO3]MO AVG report only all year
901Hardness, total [as CaCO3]DAILY MX report only all year
901E. coli, MTEC-MFMO GEOMN report only Jun, Jul, Aug
901E. coli, MTEC-MFDAILY MX report only Jun, Jul, Aug

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