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Sewerage Systems, Nathalie, Virginia. NPDES permit VA0022721, in force until Jul 31, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ .58 kg/d | all year |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ .87 kg/d | all year |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year |
| pH | daily minimum | ≥ 6 SU | all year |
| pH | daily maximum | ≤ 9 SU | all year |
| Solids, total suspended | monthly average | ≤ 60 mg/L | all year |
| Solids, total suspended | maximum weekly average | ≤ 90 mg/L | all year |
| Solids, total suspended | monthly average | ≤ 1.2 kg/d | all year |
| Solids, total suspended | maximum weekly average | ≤ 1.7 kg/d | all year |
| Solids, total suspended | monthly average | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 7 mg/L | all year |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 7 mg/L | all year |
| Flow, in conduit or thru treatment plant | monthly average | ≤ .0051 MGD (alert, not enforceable) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) (alert, not enforceable) | all year |
| Chlorine, total residual | monthly average | ≤ .0098 mg/L | all year |
| Chlorine, total residual | weekly average | ≤ .012 mg/L | all year |
| Chlorine, total residual | instantaneous minimum | ≥ .6 mg/L | all year |
| BOD, percent removal [total] | monthly average minimum | ≥ 85 % | all year |
| E. coli | geometric mean | ≤ 126 #/100mL | all year |
| Solids, suspended percent removal | monthly average minimum | ≥ 65 % | all year |
Cited limits by parameter: Virginia's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/VA0022721 · MCP: https://passage-data.com/mcp