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Airports, Flying Fields, & Services, Hollister, Missouri. NPDES permit MO0135127 expired Dec 31, 2024; its limits still apply. Last 12 months: over a limit 17 times (last August 2026), 20 required values missing, 6 of 26 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Aluminum, total recoverable, daily maximum | 2918 | ≤ 750 ug/L | 289% |
| October 2025 | Aluminum, total recoverable, monthly average | 2918 | ≤ 251 ug/L | 1063% |
| October 2025 | E. coli, 30-day geometric mean | 365 | ≤ 206 #/100mL | 77% |
| October 2025 | E. coli, daily maximum | 365 | ≤ 206 #/100mL | 77% |
| October 2025 | Iron, total recoverable, daily maximum | 1072 | ≤ 493 ug/L | 117% |
| October 2025 | Iron, total recoverable, monthly average | 1072 | ≤ 246 ug/L | 336% |
| October 2025 | Phosphorus, total [as P], monthly average | 1.1 | ≤ .5 mg/L | 120% |
| October 2025 | Solids, total suspended, daily maximum | 32 | ≤ 20 mg/L | 60% |
| October 2025 | Solids, total suspended, monthly average | 32 | ≤ 15 mg/L | 113% |
| December 2025 | Aluminum, total recoverable, daily maximum | 859 | ≤ 750 ug/L | 15% |
| December 2025 | Aluminum, total recoverable, monthly average | 859 | ≤ 251 ug/L | 242% |
| December 2025 | Oxygen, dissolved [DO], daily minimum | 2.96 | ≥ 5 mg/L | 41% |
| May 2026 | BOD, 5-day, 20 deg. C, monthly average | 10.8 | ≤ 10 mg/L | 8% |
| May 2026 | Nitrogen, ammonia total [as N], monthly average | 3.06 | ≤ 1.4 mg/L | 119% |
| August 2026 | BOD, 5-day, 20 deg. C, daily maximum | 17.9 | ≤ 15 mg/L | 19% |
| August 2026 | BOD, 5-day, 20 deg. C, monthly average | 17.9 | ≤ 10 mg/L | 79% |
| August 2026 | Phosphorus, total [as P], monthly average | .66 | ≤ .5 mg/L | 32% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | all year | 001 |
| Oxygen, dissolved [DO] | monthly average minimum | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 15 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 10 mg/L | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 20 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 15 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.5 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.7 mg/L | Apr–Sep | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.8 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.4 mg/L | Apr–Sep | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ .5 mg/L | all year | 001 |
| Iron, total recoverable | daily maximum | ≤ 493 ug/L | all year | 001 |
| Iron, total recoverable | monthly average | ≤ 246 ug/L | all year | 001 |
| Aluminum, total recoverable | daily maximum | ≤ 750 ug/L | all year | 001 |
| Aluminum, total recoverable | monthly average | ≤ 251 ug/L | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| E. coli | daily maximum | ≤ 206 #/100mL | all year | 001 |
| E. coli | 30-day geometric mean | ≤ 206 #/100mL | all year | 001 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 40 mg/L | all year | 002 |
| pH | minimum | ≥ 6.5 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 002 |
| Solids, settleable | daily maximum | report only (mL/L) | all year | 002 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | ≤ 10 mg/L | all year | 002 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.5 mg/L | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Toluene | daily maximum | report only (ug/L) | all year | 002 |
| Benzene | daily maximum | report only (ug/L) | all year | 002 |
| Ethylbenzene | daily maximum | report only (ug/L) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Xylene [mix of m+o+p] | daily maximum | report only (ug/L) | all year | 002 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 40 mg/L | all year | 003 |
| pH | minimum | ≥ 6.5 SU | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| Solids, settleable | daily maximum | report only (mL/L) | all year | 003 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | ≤ 10 mg/L | all year | 003 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.5 mg/L | all year | 003 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Toluene | daily maximum | report only (ug/L) | all year | 003 |
| Benzene | daily maximum | report only (ug/L) | all year | 003 |
| Ethylbenzene | daily maximum | report only (ug/L) | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Xylene [mix of m+o+p] | daily maximum | report only (ug/L) | all year | 003 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 40 mg/L | all year | 004 |
| pH | minimum | ≥ 6.5 SU | all year | 004 |
| pH | maximum | ≤ 9 SU | all year | 004 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 004 |
| Solids, settleable | daily maximum | report only (mL/L) | all year | 004 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | ≤ 10 mg/L | all year | 004 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.5 mg/L | all year | 004 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Toluene | daily maximum | report only (ug/L) | all year | 004 |
| Benzene | daily maximum | report only (ug/L) | all year | 004 |
| Ethylbenzene | daily maximum | report only (ug/L) | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| Xylene [mix of m+o+p] | daily maximum | report only (ug/L) | all year | 004 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 40 mg/L | all year | 005 |
| pH | minimum | ≥ 6.5 SU | all year | 005 |
| pH | maximum | ≤ 9 SU | all year | 005 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 005 |
| Solids, settleable | daily maximum | report only (mL/L) | all year | 005 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | ≤ 10 mg/L | all year | 005 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 005 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.5 mg/L | all year | 005 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 005 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 005 |
| Toluene | daily maximum | report only (ug/L) | all year | 005 |
| Benzene | daily maximum | report only (ug/L) | all year | 005 |
| Ethylbenzene | daily maximum | report only (ug/L) | all year | 005 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 005 |
| Xylene [mix of m+o+p] | daily maximum | report only (ug/L) | all year | 005 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 40 mg/L | all year | 006 |
| pH | minimum | ≥ 6.5 SU | all year | 006 |
| pH | maximum | ≤ 9 SU | all year | 006 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 006 |
| Solids, settleable | daily maximum | report only (mL/L) | all year | 006 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | ≤ 10 mg/L | all year | 006 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 006 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 006 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 006 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 006 |
| Toluene | daily maximum | report only (ug/L) | all year | 006 |
| Benzene | daily maximum | report only (ug/L) | all year | 006 |
| Ethylbenzene | daily maximum | report only (ug/L) | all year | 006 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 006 |
| Xylene [mix of m+o+p] | daily maximum | report only (ug/L) | all year | 006 |
Cited limits by parameter: Missouri's rules and the federal ones.
Same industry: the 9 Transportation by Air permits in Missouri.
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