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National Security, Columbus, Ohio. NPDES permit OH0124095 expired Oct 31, 2026. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 014 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 014 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 014 |
| Oxygen demand, chem. [low level] [COD] | monthly average | report only (mg/L) | all year | 014 |
| Oxygen demand, chem. [low level] [COD] | daily maximum | report only (mg/L) | all year | 014 |
| pH | daily minimum | ≥ 6.5 SU | all year | 014 |
| pH | daily maximum | ≤ 9 SU | all year | 014 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 014 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 014 |
| Oil and grease, hexane extr method | monthly average | ≤ 15 mg/L | all year | 014 |
| Oil and grease, hexane extr method | daily maximum | ≤ 20 mg/L | all year | 014 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jun, Aug | 014 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 014 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jun, Aug | 014 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 014 |
| Phenol | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 014 |
| Phenol | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 014 |
| Rainfall | monthly average | report only (in) | all year | 014 |
| Rainfall | daily maximum | report only (in) | all year | 014 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 014 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 014 |
| Propylene glycol, total | monthly average | report only (ug/L) | Jan, Feb, Mar, Apr, Nov, Dec | 014 |
| Propylene glycol, total | daily maximum | report only (ug/L) | Jan, Feb, Mar, Apr, Nov, Dec | 014 |
| Solids, total dissolved- 180 deg. C | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 014 |
| Solids, total dissolved- 180 deg. C | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 014 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 601 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 601 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 601 |
| Oxygen demand, chem. [low level] [COD] | monthly average | report only (mg/L) | all year | 601 |
| Oxygen demand, chem. [low level] [COD] | daily maximum | report only (mg/L) | all year | 601 |
| 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 |
| Oil and grease, hexane extr method | monthly average | ≤ 15 mg/L | Mar, Jun, Aug, Dec | 601 |
| Oil and grease, hexane extr method | daily maximum | ≤ 20 mg/L | Mar, Jun, Aug, Dec | 601 |
| Toluene | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Toluene | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Benzene | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Benzene | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Ethylbenzene | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Ethylbenzene | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Phenol | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Phenol | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Naphthalene | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Naphthalene | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Rainfall | monthly average | report only (in) | all year | 601 |
| Rainfall | daily maximum | report only (in) | all year | 601 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 601 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 601 |
| Xylene [mix of m+o+p] | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Xylene [mix of m+o+p] | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
Cited limits by parameter: Ohio's rules and the federal ones.
Same industry: the 7 National Security and International Affairs permits in Ohio.
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On EPA ECHO: Facility report · DMR history
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