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Federal facility, major discharger, Grand Forks Afb, North Dakota. NPDES permit ND0020621, in force until Sep 30, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | daily minimum | report only (deg C) | all year | 01A |
| Temperature, water deg. centigrade | 30-day average | report only (deg C) | all year | 01A |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 01A |
| BOD, 5-day, 20 deg. C | daily minimum | report only (mg/L) | all year | 01A |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 25 mg/L | all year | 01A |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 45 mg/L | all year | 01A |
| pH | minimum | ≥ 6 SU | all year | 01A |
| pH | maximum | ≤ 9 SU | all year | 01A |
| Solids, total suspended | daily minimum | report only (mg/L) | all year | 01A |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 01A |
| Solids, total suspended | maximum 7-day average | ≤ 45 mg/L | all year | 01A |
| Oil & Grease | daily maximum | ≤ 10 mg/L | all year | 01A |
| Nitrogen, total [as N] | daily minimum | report only (mg/L) | all year | 01A |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 01A |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 01A |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 01A |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | all year | 01A |
| Nitrogen, ammonia total [as N] | daily minimum | report only (mg/L) | all year | 01A |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 01A |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 01A |
| Phosphorus, total [as P] | daily minimum | report only (mg/L) | all year | 01A |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 01A |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 01A |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 01A |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year | 01A |
| Cyanide, total [as CN] | daily minimum | report only (mg/L) | all year | 01A |
| Cyanide, total [as CN] | daily average | report only (mg/L) | all year | 01A |
| Cyanide, total [as CN] | daily maximum | report only (mg/L) | all year | 01A |
| Hardness, total [as CaCO3] | daily minimum | report only (mg/L) | all year | 01A |
| Hardness, total [as CaCO3] | daily average | report only (mg/L) | all year | 01A |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 01A |
| Arsenic, total [as As] | daily minimum | report only (mg/L) | all year | 01A |
| Arsenic, total [as As] | daily average | report only (mg/L) | all year | 01A |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | 01A |
| Beryllium, total [as Be] | daily minimum | report only (mg/L) | all year | 01A |
| Beryllium, total [as Be] | daily average | report only (mg/L) | all year | 01A |
| Beryllium, total [as Be] | daily maximum | report only (mg/L) | all year | 01A |
| Cadmium, total [as Cd] | daily minimum | report only (mg/L) | all year | 01A |
| Cadmium, total [as Cd] | daily average | report only (mg/L) | all year | 01A |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 01A |
| Chromium, total [as Cr] | daily minimum | report only (mg/L) | all year | 01A |
| Chromium, total [as Cr] | daily average | report only (mg/L) | all year | 01A |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | 01A |
| Copper, total [as Cu] | daily minimum | report only (mg/L) | all year | 01A |
| Copper, total [as Cu] | daily average | report only (mg/L) | all year | 01A |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 01A |
| Lead, total [as Pb] | daily minimum | report only (mg/L) | all year | 01A |
| Lead, total [as Pb] | daily average | report only (mg/L) | all year | 01A |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 01A |
| Thallium, total [as Tl] | daily minimum | report only (mg/L) | all year | 01A |
| Thallium, total [as Tl] | daily average | report only (mg/L) | all year | 01A |
| Thallium, total [as Tl] | daily maximum | report only (mg/L) | all year | 01A |
| Nickel, total [as Ni] | daily minimum | report only (mg/L) | all year | 01A |
| Nickel, total [as Ni] | daily average | report only (mg/L) | all year | 01A |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 01A |
| Silver, total [as Ag] | daily minimum | report only (mg/L) | all year | 01A |
| Silver, total [as Ag] | daily average | report only (mg/L) | all year | 01A |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 01A |
| Zinc, total [as Zn] | daily minimum | report only (mg/L) | all year | 01A |
| Zinc, total [as Zn] | daily average | report only (mg/L) | all year | 01A |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 01A |
| Antimony, total [as Sb] | daily minimum | report only (mg/L) | all year | 01A |
| Antimony, total [as Sb] | daily average | report only (mg/L) | all year | 01A |
| Antimony, total [as Sb] | daily maximum | report only (mg/L) | all year | 01A |
| Selenium, total [as Se] | daily minimum | report only (mg/L) | all year | 01A |
| Selenium, total [as Se] | daily average | report only (mg/L) | all year | 01A |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | 01A |
| Total phenols | daily minimum | report only (mg/L) | all year | 01A |
| Total phenols | daily average | report only (mg/L) | all year | 01A |
| Total phenols | daily maximum | report only (mg/L) | all year | 01A |
| Flow, in conduit or thru treatment plant | 30-day average | report only (MGD) | all year | 01A |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 01A |
| E. coli | daily minimum | report only (#/100mL) | Apr–Oct | 01A |
| E. coli | 30-day geometric mean | ≤ 126 #/100mL | Apr–Oct | 01A |
| E. coli | daily maximum | ≤ 409 #/100mL | Apr–Oct | 01A |
| Flow, total | total | report only (Mgal) | all year | 01A |
| Mercury, total [as Hg] | daily minimum | report only (mg/L) | all year | 01A |
| Mercury, total [as Hg] | daily average | report only (mg/L) | all year | 01A |
| Mercury, total [as Hg] | daily maximum | report only (mg/L) | all year | 01A |
| Oil and grease visual | total | report only (N=0;Y=1) | all year | 01A |
| Toxic Units Static Renewal 48Hr Acute Ceriodaphnia dubia | maximum | ≤ 1 tox acute | all year | 01A |
| TU Static Renewal 96Hr Acute Pimphales promelas | maximum | ≤ 1 tox acute | all year | 01A |
| Temperature, water deg. centigrade | daily minimum | report only (deg C) | all year | 01B |
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | 01B |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 01B |
| BOD, 5-day, 20 deg. C | daily minimum | report only (mg/L) | all year | 01B |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 25 mg/L | all year | 01B |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 45 mg/L | all year | 01B |
| pH | minimum | ≥ 6 SU | all year | 01B |
| pH | maximum | ≤ 9 SU | all year | 01B |
| Solids, total suspended | daily minimum | report only (mg/L) | all year | 01B |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 01B |
| Solids, total suspended | maximum 7-day average | ≤ 45 mg/L | all year | 01B |
| Oil & Grease | daily maximum | ≤ 10 mg/L | all year | 01B |
| Nitrogen, total [as N] | daily minimum | report only (mg/L) | all year | 01B |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 01B |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 01B |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 01B |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | all year | 01B |
| Nitrogen, ammonia total [as N] | daily minimum | report only (mg/L) | all year | 01B |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 01B |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 01B |
| Phosphorus, total [as P] | daily minimum | report only (mg/L) | all year | 01B |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 01B |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 01B |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 01B |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year | 01B |
| Cyanide, total [as CN] | daily minimum | report only (mg/L) | all year | 01B |
| Cyanide, total [as CN] | daily average | report only (mg/L) | all year | 01B |
| Cyanide, total [as CN] | daily maximum | report only (mg/L) | all year | 01B |
| Hardness, total [as CaCO3] | daily minimum | report only (mg/L) | all year | 01B |
| Hardness, total [as CaCO3] | daily average | report only (mg/L) | all year | 01B |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 01B |
| Arsenic, total [as As] | daily minimum | report only (mg/L) | all year | 01B |
| Arsenic, total [as As] | daily average | report only (mg/L) | all year | 01B |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | 01B |
| Beryllium, total [as Be] | daily minimum | report only (mg/L) | all year | 01B |
| Beryllium, total [as Be] | daily average | report only (mg/L) | all year | 01B |
| Beryllium, total [as Be] | daily maximum | report only (mg/L) | all year | 01B |
| Cadmium, total [as Cd] | daily minimum | report only (mg/L) | all year | 01B |
| Cadmium, total [as Cd] | daily average | report only (mg/L) | all year | 01B |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 01B |
| Chromium, total [as Cr] | daily minimum | report only (mg/L) | all year | 01B |
| Chromium, total [as Cr] | daily average | report only (mg/L) | all year | 01B |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | 01B |
| Copper, total [as Cu] | daily minimum | report only (mg/L) | all year | 01B |
| Copper, total [as Cu] | daily average | report only (mg/L) | all year | 01B |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 01B |
| Lead, total [as Pb] | daily minimum | report only (mg/L) | all year | 01B |
| Lead, total [as Pb] | daily average | report only (mg/L) | all year | 01B |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 01B |
| Thallium, total [as Tl] | daily minimum | report only (mg/L) | all year | 01B |
| Thallium, total [as Tl] | daily average | report only (mg/L) | all year | 01B |
| Thallium, total [as Tl] | daily maximum | report only (mg/L) | all year | 01B |
| Nickel, total [as Ni] | daily minimum | report only (mg/L) | all year | 01B |
| Nickel, total [as Ni] | daily average | report only (mg/L) | all year | 01B |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 01B |
| Silver, total [as Ag] | daily minimum | report only (mg/L) | all year | 01B |
| Silver, total [as Ag] | daily average | report only (mg/L) | all year | 01B |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 01B |
| Zinc, total [as Zn] | daily minimum | report only (mg/L) | all year | 01B |
| Zinc, total [as Zn] | daily average | report only (mg/L) | all year | 01B |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 01B |
| Antimony, total [as Sb] | daily minimum | report only (mg/L) | all year | 01B |
| Antimony, total [as Sb] | daily average | report only (mg/L) | all year | 01B |
| Antimony, total [as Sb] | daily maximum | report only (mg/L) | all year | 01B |
| Selenium, total [as Se] | daily minimum | report only (mg/L) | all year | 01B |
| Selenium, total [as Se] | daily average | report only (mg/L) | all year | 01B |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | 01B |
| Total phenols | daily minimum | report only (mg/L) | all year | 01B |
| Total phenols | daily average | report only (mg/L) | all year | 01B |
| Total phenols | daily maximum | report only (mg/L) | all year | 01B |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 01B |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 01B |
| E. coli | daily minimum | report only (#/100mL) | Apr–Oct | 01B |
| E. coli | 30-day geometric mean | ≤ 126 #/100mL | Apr–Oct | 01B |
| E. coli | daily maximum | ≤ 409 #/100mL | Apr–Oct | 01B |
| Flow, total | total | report only (Mgal) | all year | 01B |
| Mercury, total [as Hg] | daily minimum | report only (mg/L) | all year | 01B |
| Mercury, total [as Hg] | daily average | report only (mg/L) | all year | 01B |
| Mercury, total [as Hg] | daily maximum | report only (mg/L) | all year | 01B |
| Oil and grease visual | total | report only (N=0;Y=1) | all year | 01B |
| Toxic Units Static Renewal 48Hr Acute Ceriodaphnia dubia | maximum | ≤ 1 tox acute | all year | 01B |
| TU Static Renewal 96Hr Acute Pimphales promelas | maximum | ≤ 1 tox acute | all year | 01B |
Cited limits by parameter: North Dakota's rules and the federal ones.
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