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Sewage treatment plant, major discharger, Norwalk, Ohio. NPDES permit OH0052604, in force until Jul 31, 2030. Last 12 months: over a limit 9 times (last July 2026), 2 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| November 2025 | Toxicity [chronic], Pimephales promelas [Fathead Minnow], monthly average | 1.41 | ≤ 1 tox chronic | 41% |
| February 2026 | Mercury, total low level, monthly average | .000087 | ≤ .000029 kg/d | 200% |
| February 2026 | Mercury, total low level, monthly average | 15 | ≤ 2.2 ng/L | 582% |
| April 2026 | Mercury, total low level, monthly average | .0000389 | ≤ .000029 kg/d | 34% |
| April 2026 | Mercury, total low level, monthly average | 3.38 | ≤ 2.2 ng/L | 54% |
| May 2026 | E. coli, MTEC-MF, monthly geometric mean | 516.04 | ≤ 126 MPN/100mL | 310% |
| May 2026 | E. coli, MTEC-MF, weekly geometric mean | 1220 | ≤ 284 MPN/100mL | 330% |
| May 2026 | Solids, total suspended, weekly maximum | 468 | ≤ 397 kg/d | 18% |
| July 2026 | E. coli, MTEC-MF, weekly geometric mean | 378.4 | ≤ 284 MPN/100mL | 33% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | May–Oct | 001 |
| Solids, total suspended | monthly average | ≤ 25 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Solids, total suspended | weekly maximum | ≤ 30 mg/L | May–Oct | 001 |
| Solids, total suspended | weekly maximum | ≤ 40 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 265 kg/d | May–Oct | 001 |
| Solids, total suspended | monthly average | ≤ 332 kg/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Solids, total suspended | weekly maximum | ≤ 397 kg/d | May–Oct | 001 |
| Solids, total suspended | weekly maximum | ≤ 530 kg/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.4 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.7 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ 2.1 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ 5.5 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 19 kg/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 49 kg/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ 28 kg/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ 73 kg/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | 001 |
| Phosphorus, total [as P] | weekly maximum | ≤ 1.5 mg/L | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 13 kg/d | all year | 001 |
| Phosphorus, total [as P] | weekly maximum | ≤ 20 kg/d | all year | 001 |
| Phosphate, ortho, dissolved [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphate, ortho, dissolved [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Nickel, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Zinc, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Cadmium, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Lead, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Lead, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Chromium, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Copper, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| E. coli, MTEC-MF | monthly geometric mean | ≤ 126 MPN/100mL | May–Oct | 001 |
| E. coli, MTEC-MF | weekly geometric mean | ≤ 284 MPN/100mL | May–Oct | 001 |
| Di[2-ethylhexyl] phthalate [DEHP] | monthly average | report only (ug/L) | all year | 001 |
| Di[2-ethylhexyl] phthalate [DEHP] | daily maximum | report only (ug/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .011 mg/L | May–Oct | 001 |
| Mercury, total low level | monthly average | ≤ 2.2 ng/L | all year | 001 |
| Mercury, total low level | daily maximum | ≤ 1100 ng/L | all year | 001 |
| Mercury, total low level | monthly average | ≤ .000029 kg/d | all year | 001 |
| Mercury, total low level | daily maximum | ≤ .0146 kg/d | all year | 001 |
| Cyanide, free available | monthly average | ≤ 5.2 ug/L | all year | 001 |
| Cyanide, free available | daily maximum | ≤ 22 ug/L | all year | 001 |
| Cyanide, free available | monthly average | ≤ .069 kg/d | all year | 001 |
| Cyanide, free available | daily maximum | ≤ .29 kg/d | all year | 001 |
| Toxicity [acute], Ceriodaphnia dubia | monthly average | report only (tox acute) | Nov | 001 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | report only (tox acute) | Nov | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | monthly average | report only (tox chronic) | Nov | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | report only (tox chronic) | Nov | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | monthly average | report only (tox acute) | May, Nov | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | report only (tox acute) | May, Nov | 001 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | monthly average | ≤ 1 tox chronic | May, Nov | 001 |
| pH, maximum | daily maximum | ≤ 9 SU | all year | 001 |
| pH, minimum | daily minimum | ≥ 6.5 SU | all year | 001 |
| Solids, total dissolved- 180 deg. C | monthly average | report only (mg/L) | all year | 001 |
| Solids, total dissolved- 180 deg. C | daily maximum | report only (mg/L) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 15 mg/L | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly maximum | ≤ 23 mg/L | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly maximum | ≤ 40 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 199 kg/d | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 332 kg/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly maximum | ≤ 305 kg/d | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly maximum | ≤ 530 kg/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Overflows | monthly average | report only (occur/mo) | all year | 003 |
| Overflows | daily maximum | report only (occur/mo) | all year | 003 |
| Overflow volume [SS0 volume, CSO volume] | monthly average | report only (Mgal) | all year | 003 |
| Overflow volume [SS0 volume, CSO volume] | daily maximum | report only (Mgal) | all year | 003 |
| Overflows | monthly average | report only (occur/mo) | all year | 004 |
| Overflows | daily maximum | report only (occur/mo) | all year | 004 |
| Overflow volume [SS0 volume, CSO volume] | monthly average | report only (Mgal) | all year | 004 |
| Overflow volume [SS0 volume, CSO volume] | daily maximum | report only (Mgal) | all year | 004 |
| Overflows | monthly average | report only (occur/mo) | all year | 006 |
| Overflows | daily maximum | report only (occur/mo) | all year | 006 |
| Overflow volume [SS0 volume, CSO volume] | monthly average | report only (Mgal) | all year | 006 |
| Overflow volume [SS0 volume, CSO volume] | daily maximum | report only (Mgal) | all year | 006 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 009 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 009 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 009 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 009 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | 009 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 009 |
| Bypass valve | monthly average | report only (occur/mo) | all year | 009 |
| Bypass valve | daily maximum | report only (occur/mo) | all year | 009 |
| Bypass of treatment | monthly average | report only (hr/mo) | all year | 009 |
| Bypass of treatment | daily maximum | report only (hr/mo) | all year | 009 |
| Overflows | monthly average | report only (occur/mo) | all year | 300 |
| Overflows | daily maximum | report only (occur/mo) | all year | 300 |
| Nitrogen, ammonia in bottom deposits | monthly average | report only (mg/kg) | Mar, Jun, Sep, Dec | 581 |
| Nitrogen, ammonia in bottom deposits | daily maximum | report only (mg/kg) | Mar, Jun, Sep, Dec | 581 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/kg) | Mar, Jun, Sep, Dec | 581 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/kg) | Mar, Jun, Sep, Dec | 581 |
| Phosphorous, total, in bottom deposits | monthly average | report only (mg/kg) | Mar, Jun, Sep, Dec | 581 |
| Phosphorous, total, in bottom deposits | daily maximum | report only (mg/kg) | Mar, Jun, Sep, Dec | 581 |
| Potassium, in bottom deposits | monthly average | report only (mg/kg) | Mar, Jun, Sep, Dec | 581 |
| Potassium, in bottom deposits | daily maximum | report only (mg/kg) | Mar, Jun, Sep, Dec | 581 |
| Arsenic, dry weight | daily maximum | ≤ 75 mg/kg | Mar, Jun, Sep, Dec | 581 |
| Cadmium, in bottom deposits [dry wgt] | daily maximum | ≤ 85 mg/kg | Mar, Jun, Sep, Dec | 581 |
| Copper in bottom deposits [dry wgt] | daily maximum | ≤ 4300 mg/kg | Mar, Jun, Sep, Dec | 581 |
| Lead, total dry weight [as Pb] | daily maximum | ≤ 840 mg/kg | Mar, Jun, Sep, Dec | 581 |
| Nickel, tot in bottom deposits [dry wgt] | daily maximum | ≤ 420 mg/kg | Mar, Jun, Sep, Dec | 581 |
| Zinc in bottom deposits [dry wgt] | daily maximum | ≤ 7500 mg/kg | Mar, Jun, Sep, Dec | 581 |
| Selenium, dry weight | daily maximum | ≤ 100 mg/kg | Mar, Jun, Sep, Dec | 581 |
| Fecal coliform | daily maximum | ≤ 2000000 MPN/g | Mar, Jun, Sep, Dec | 581 |
| Biosolids weight indluding admixtures | monthly average | report only (dry ton) | Mar, Jun, Sep, Dec | 581 |
| Biosolids weight indluding admixtures | daily maximum | report only (dry ton) | Mar, Jun, Sep, Dec | 581 |
| Sludge weight, dry | monthly average | report only (dry ton) | Mar, Jun, Sep, Dec | 581 |
| Sludge weight, dry | daily maximum | report only (dry ton) | Mar, Jun, Sep, Dec | 581 |
| Solids, total, percent | monthly average | report only (%) | Mar, Jun, Sep, Dec | 581 |
| Solids, total, percent | daily maximum | report only (%) | Mar, Jun, Sep, Dec | 581 |
| Mercury, tot in bot deposits [dry wgt] | daily maximum | ≤ 57 mg/kg | Mar, Jun, Sep, Dec | 581 |
| Molybdenum, sludge, total, dry weight [as Mo] | daily maximum | ≤ 75 mg/kg | Mar, Jun, Sep, Dec | 581 |
| Biosolids weight indluding admixtures | monthly average | report only (dry ton) | Dec | 586 |
| Biosolids weight indluding admixtures | daily maximum | report only (dry ton) | Dec | 586 |
| Sludge waste from secondary clarifiers | monthly average | report only (gal) | Dec | 588 |
| Sludge waste from secondary clarifiers | daily maximum | report only (gal) | Dec | 588 |
| pH | daily minimum | report only (SU) | all year | 601 |
| pH | daily maximum | report only (SU) | all year | 601 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 601 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 601 |
| Cyanide, total [as CN] | monthly average | report only (mg/L) | all year | 601 |
| Cyanide, total [as CN] | daily maximum | report only (mg/L) | all year | 601 |
| Nickel, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Zinc, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Cadmium, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Lead, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Lead, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Chromium, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Copper, total recoverable | monthly average | report only (ug/L) | all year | 601 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 601 |
| Chromium, hexavalent dissolved [as Cr] | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Di[2-ethylhexyl] phthalate [DEHP] | monthly average | report only (ug/L) | all year | 601 |
| Di[2-ethylhexyl] phthalate [DEHP] | daily maximum | report only (ug/L) | all year | 601 |
| Mercury, total low level | monthly average | report only (ng/L) | all year | 601 |
| Mercury, total low level | daily maximum | report only (ng/L) | all year | 601 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | 601 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 601 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 801 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 801 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 801 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 801 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 801 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 801 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 801 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 801 |
| E. coli, MTEC-MF | monthly geometric mean | report only (MPN/100mL) | Jun–Aug | 801 |
| E. coli, MTEC-MF | daily maximum | report only (MPN/100mL) | Jun–Aug | 801 |
| %Effect Static Renewal 48Hr Acute Ceriodaphnia dubia | monthly average | report only (%) | Nov | 801 |
| %Effect Static Renewal 48Hr Acute Ceriodaphnia dubia | daily maximum | report only (%) | Nov | 801 |
| %Effect Static Renewal 96Hr Acute Pimephales promelas | monthly average | report only (%) | May, Nov | 801 |
| %Effect Static Renewal 96Hr Acute Pimephales promelas | daily maximum | report only (%) | May, Nov | 801 |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly average | report only (%) | Nov | 801 |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | daily maximum | report only (%) | Nov | 801 |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | monthly average | report only (%) | May, Nov | 801 |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | daily maximum | report only (%) | May, Nov | 801 |
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | 901 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 901 |
| pH | daily minimum | report only (SU) | all year | 901 |
| pH | daily maximum | report only (SU) | all year | 901 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 901 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 901 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 901 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 901 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 901 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 901 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 901 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 901 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 901 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 901 |
| E. coli, MTEC-MF | monthly geometric mean | report only (MPN/100mL) | Jun–Aug | 901 |
| E. coli, MTEC-MF | daily maximum | report only (MPN/100mL) | Jun–Aug | 901 |
| Parameter | New limit | From | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|---|
| Copper, total recoverable, monthly average | 20 ug/L | Aug 1, 2028 | new | 20.5 ug/L (6 values) | 1.02× |
| Copper, total recoverable, monthly average | 20 ug/L | Aug 1, 2029 | new | 20.5 ug/L (6 values) | 1.02× |
| Copper, total recoverable, daily maximum | 32 ug/L | Aug 1, 2028 | new | 20.5 ug/L (6 values) | 0.641× |
| Copper, total recoverable, daily maximum | 0.42 kg/d | Aug 1, 2028 | new | — | — |
| Copper, total recoverable, monthly average | 0.26 kg/d | Aug 1, 2028 | new | — | — |
| Di[2-ethylhexyl] phthalate [DEHP], daily maximum | 15 kg/d | Aug 1, 2028 | new | — | — |
| Di[2-ethylhexyl] phthalate [DEHP], daily maximum | 1104 ug/L | Aug 1, 2028 | new | — | — |
| Di[2-ethylhexyl] phthalate [DEHP], monthly average | 0.11 kg/d | Aug 1, 2028 | new | — | — |
| Di[2-ethylhexyl] phthalate [DEHP], monthly average | 8.4 ug/L | Aug 1, 2028 | new | — | — |
| Copper, total recoverable, daily maximum | 32 ug/L | Aug 1, 2029 | new | 20.5 ug/L (6 values) | 0.641× |
| Copper, total recoverable, daily maximum | 0.42 kg/d | Aug 1, 2029 | new | — | — |
| Copper, total recoverable, monthly average | 0.26 kg/d | Aug 1, 2029 | new | — | — |
| Di[2-ethylhexyl] phthalate [DEHP], daily maximum | 1104 ug/L | Aug 1, 2029 | new | — | — |
| Di[2-ethylhexyl] phthalate [DEHP], daily maximum | 15 kg/d | Aug 1, 2029 | new | — | — |
| Di[2-ethylhexyl] phthalate [DEHP], monthly average | 8.4 ug/L | Aug 1, 2029 | new | — | — |
| Di[2-ethylhexyl] phthalate [DEHP], monthly average | 0.11 kg/d | Aug 1, 2029 | new | — | — |
Cited limits by parameter: Ohio's rules and the federal ones.
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