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Sewerage Systems, major discharger, Stow, Ohio. NPDES permit OH0064009 expired Sep 30, 2026; its limits still apply. Last 12 months: over a limit 18 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| May 2026 | pH, minimum, daily minimum | 6.28 | ≥ 6.5 SU | — |
| June 2026 | Nitrogen, ammonia total [as N], monthly average | 4 | ≤ 1 mg/L | 300% |
| June 2026 | Nitrogen, ammonia total [as N], monthly average | 56 | ≤ 30.3 kg/d | 85% |
| June 2026 | Nitrogen, ammonia total [as N], weekly maximum | 6.1 | ≤ 1.5 mg/L | 307% |
| June 2026 | Nitrogen, ammonia total [as N], weekly maximum | 77 | ≤ 45.4 kg/d | 70% |
| June 2026 | Oxygen, dissolved [DO], daily minimum | 3.14 | ≥ 7 mg/L | 55% |
| June 2026 | Phosphorus, total [as P], weekly maximum | 1.2 | ≤ 1.1 mg/L | 9% |
| July 2026 | E. coli, MTEC-MF, weekly geometric mean | 1900 | ≤ 284 MPN/100mL | 569% |
| July 2026 | Nitrogen, ammonia total [as N], monthly average | 121 | ≤ 30.3 kg/d | 299% |
| July 2026 | Nitrogen, ammonia total [as N], monthly average | 9.03 | ≤ 1 mg/L | 803% |
| July 2026 | Nitrogen, ammonia total [as N], weekly maximum | 15.1 | ≤ 1.5 mg/L | 907% |
| July 2026 | Nitrogen, ammonia total [as N], weekly maximum | 197 | ≤ 45.4 kg/d | 334% |
| July 2026 | Phosphorus, total [as P], weekly maximum | 1.7 | ≤ 1.1 mg/L | 55% |
| August 2026 | Nitrogen, ammonia total [as N], monthly average | 12 | ≤ 1 mg/L | 1100% |
| August 2026 | Nitrogen, ammonia total [as N], monthly average | 172 | ≤ 30.3 kg/d | 468% |
| August 2026 | Nitrogen, ammonia total [as N], weekly maximum | 15.1 | ≤ 1.5 mg/L | 907% |
| August 2026 | Nitrogen, ammonia total [as N], weekly maximum | 244 | ≤ 45.4 kg/d | 437% |
| August 2026 | Oxygen, dissolved [DO], daily minimum | 4.19 | ≥ 7 mg/L | 40% |
| 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 | ≥ 7 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 12 mg/L | all year | 001 |
| Solids, total suspended | weekly maximum | ≤ 18 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 242.2 kg/d | all year | 001 |
| Solids, total suspended | weekly maximum | ≤ 363.4 kg/d | all year | 001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 10.1 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ 1.5 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ 15.2 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 30.3 kg/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 305.8 kg/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ 45.4 kg/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ 460.3 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 | ≤ .7 mg/L | all year | 001 |
| Phosphorus, total [as P] | weekly maximum | ≤ 1.1 mg/L | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 21.2 kg/d | all year | 001 |
| Phosphorus, total [as P] | weekly maximum | ≤ 33.3 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, Sep, Dec | 001 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Zinc, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Cadmium, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Lead, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Lead, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Chromium, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Sep, 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 | ≤ 16 ug/L | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | ≤ 31 ug/L | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | monthly average | ≤ .48 kg/d | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | ≤ .94 kg/d | all year | 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) | Mar, Jun, Sep, Dec | 001 |
| Di[2-ethylhexyl] phthalate [DEHP] | daily maximum | report only (ug/L) | Mar, Jun, Sep, Dec | 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 |
| Mercury, total low level | monthly average | ≤ 2.6 ng/L | all year | 001 |
| Mercury, total low level | daily maximum | ≤ 1700 ng/L | all year | 001 |
| Mercury, total low level | monthly average | ≤ .000079 kg/d | all year | 001 |
| Mercury, total low level | daily maximum | ≤ .0515 kg/d | all year | 001 |
| Cyanide, free available | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Cyanide, free available | daily maximum | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | ≤ 1 tox acute | Jun, Dec | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | monthly average | ≤ 1.81 tox chronic | Jun, Dec | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 1 tox acute | Jun, Dec | 001 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | monthly average | ≤ 1.81 tox chronic | Jun, Dec | 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 | ≤ 10 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly maximum | ≤ 15 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 302.8 kg/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly maximum | ≤ 454.2 kg/d | all year | 001 |
| 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 |
| 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 |
| Fecal coliform in sludge, CFU/gram | daily maximum | ≤ 2000000 CFU/g | 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 |
| 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 weight, dry | monthly average | report only (dry ton) | Dec | 588 |
| Sludge weight, dry | daily maximum | report only (dry ton) | 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) | Mar, Jun, Sep, Dec | 601 |
| Cyanide, total [as CN] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 601 |
| Nickel, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 601 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Sep, Dec | 601 |
| Zinc, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 601 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Sep, Dec | 601 |
| Cadmium, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 601 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Sep, Dec | 601 |
| Lead, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 601 |
| Lead, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Sep, Dec | 601 |
| Chromium, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 601 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Sep, 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) | all year | 601 |
| Chromium, hexavalent dissolved [as Cr] | 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 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 602 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 602 |
| Bypass Volume | monthly average | report only (Mgal) | all year | 602 |
| Bypass Volume | daily maximum | report only (Mgal) | all year | 602 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | 602 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 602 |
| Bypass valve | monthly average | report only (occur/mo) | all year | 602 |
| Bypass valve | daily maximum | report only (occur/mo) | all year | 602 |
| Bypass of treatment | monthly average | report only (hr/mo) | all year | 602 |
| Bypass of treatment | daily maximum | report only (hr/mo) | all year | 602 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 603 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 603 |
| Bypass Volume | monthly average | report only (Mgal) | all year | 603 |
| Bypass Volume | daily maximum | report only (Mgal) | all year | 603 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | 603 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 603 |
| Bypass valve | monthly average | report only (occur/mo) | all year | 603 |
| Bypass valve | daily maximum | report only (occur/mo) | all year | 603 |
| Bypass of treatment | monthly average | report only (hr/mo) | all year | 603 |
| Bypass of treatment | daily maximum | report only (hr/mo) | all year | 603 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 604 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 604 |
| Bypass Volume | monthly average | report only (Mgal) | all year | 604 |
| Bypass Volume | daily maximum | report only (Mgal) | all year | 604 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | 604 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 604 |
| Bypass valve | monthly average | report only (occur/mo) | all year | 604 |
| Bypass valve | daily maximum | report only (occur/mo) | all year | 604 |
| Bypass of treatment | monthly average | report only (hr/mo) | all year | 604 |
| Bypass of treatment | daily maximum | report only (hr/mo) | all year | 604 |
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | 801 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 801 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 801 |
| pH | daily minimum | report only (SU) | all year | 801 |
| pH | daily maximum | report only (SU) | all year | 801 |
| 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 (%) | Jun, Dec | 801 |
| %Effect Static Renewal 48Hr Acute Ceriodaphnia dubia | daily maximum | report only (%) | Jun, Dec | 801 |
| %Effect Static Renewal 96Hr Acute Pimephales promelas | monthly average | report only (%) | Jun, Dec | 801 |
| %Effect Static Renewal 96Hr Acute Pimephales promelas | daily maximum | report only (%) | Jun, Dec | 801 |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly average | report only (%) | Jun, Dec | 801 |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | daily maximum | report only (%) | Jun, Dec | 801 |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | monthly average | report only (%) | Jun, Dec | 801 |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | daily maximum | report only (%) | Jun, Dec | 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 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | 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 |
Cited limits by parameter: Ohio's rules and the federal ones.
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