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Sewage treatment plant, major discharger, Richmond, Virginia. NPDES permit VA0024996, in force until Jan 31, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | minimum | ≥ 5.9 mg/L | all year | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 13 mg/L | Jun–Oct | 001 |
| Solids, total suspended | weekly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec | 001 |
| Solids, total suspended | weekly average | ≤ 20 mg/L | Jun–Oct | 001 |
| Solids, total suspended | monthly average | report only (kg/d) | Jan, Feb, Mar, Apr, May, Nov, Dec | 001 |
| Solids, total suspended | monthly average | report only (kg/d) | Jun–Oct | 001 |
| Solids, total suspended | weekly average | report only (kg/d) | Jan, Feb, Mar, Apr, May, Nov, Dec | 001 |
| Solids, total suspended | weekly average | report only (kg/d) | Jun–Oct | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 9.5 mg/L | Jun–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 12.8 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 12.1 mg/L | Jun–Oct | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 19.2 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (kg/d) | Jun–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (kg/d) | Jan, Feb, Mar, Apr, May, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly average | report only (kg/d) | Jun–Oct | 001 |
| Nitrogen, ammonia total [as N] | weekly average | report only (kg/d) | Jan, Feb, Mar, Apr, May, Nov, Dec | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 2 mg/L | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 12 MGD (alert, not enforceable) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) (alert, not enforceable) | all year | 001 |
| Chlorine, total residual | monthly average | ≤ 19 ug/L | all year | 001 |
| Chlorine, total residual | weekly average | ≤ 23 ug/L | all year | 001 |
| Chlorine, total residual | instantaneous minimum | ≥ .6 mg/L | all year | 001 |
| E. coli | geometric mean | ≤ 126 #/100mL | all year | 001 |
| Nitrogen, Total As N | annual average | ≤ 5.8 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 13 mg/L | Jun–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 20 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 20 mg/L | Jun–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (kg/d) | Jun–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (kg/d) | Jan, Feb, Mar, Apr, May, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | report only (kg/d) | Jun–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | report only (kg/d) | Jan, Feb, Mar, Apr, May, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | 001 |
| BOD, carb-5 day, 20 deg C, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Oxygen, dissolved [DO] | minimum | ≥ 5.9 mg/L | all year | 003 |
| pH | minimum | ≥ 6 SU | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | weekly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec | 003 |
| Solids, total suspended | weekly average | ≤ 20 mg/L | Jun–Oct | 003 |
| Solids, total suspended | monthly average | report only (kg/d) | Jan, Feb, Mar, Apr, May, Nov, Dec | 003 |
| Solids, total suspended | monthly average | report only (kg/d) | Jun–Oct | 003 |
| Solids, total suspended | weekly average | report only (kg/d) | Jan, Feb, Mar, Apr, May, Nov, Dec | 003 |
| Solids, total suspended | weekly average | report only (kg/d) | Jun–Oct | 003 |
| Nitrogen, ammonia total [as N] | maximum | ≤ 17.26 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | maximum | ≤ 8.07 mg/L | Jun–Oct | 003 |
| Nitrogen, ammonia total [as N] | monthly average | report only (kg/d) | Jan, Feb, Mar, Apr, May, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | monthly average | report only (kg/d) | Jun–Oct | 003 |
| Nitrogen, ammonia total [as N] | weekly average | report only (kg/d) | Jan, Feb, Mar, Apr, May, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | weekly average | report only (kg/d) | Jun–Oct | 003 |
| Phosphorus, total [as P] | average | ≤ 2 mg/L | all year | 003 |
| Chlorine, total residual | maximum | ≤ 19 ug/L | all year | 003 |
| E. coli | geometric mean | ≤ 126 #/100mL | all year | 003 |
| Nitrogen, Total As N | annual average | ≤ 5.8 mg/L | all year | 003 |
| BOD, carbonaceous [5 day, 20 C] | maximum | ≤ 30 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec | 003 |
| BOD, carbonaceous [5 day, 20 C] | maximum | ≤ 20 mg/L | Jun–Oct | 003 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (kg/d) | Jan, Feb, Mar, Apr, May, Nov, Dec | 003 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (kg/d) | Jun–Oct | 003 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | report only (kg/d) | Jan, Feb, Mar, Apr, May, Nov, Dec | 003 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | report only (kg/d) | Jun–Oct | 003 |
| Solids, total suspended | monthly average | ≤ 611 kg/d | Jun–Oct | 004 |
| Solids, total suspended | monthly average | ≤ 917 kg/d | Jan, Feb, Mar, Apr, May, Nov, Dec | 004 |
| Solids, total suspended | weekly average | ≤ 917 kg/d | Jun–Oct | 004 |
| Solids, total suspended | weekly average | ≤ 1376 kg/d | Jan, Feb, Mar, Apr, May, Nov, Dec | 004 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 581 kg/d | Jan, Feb, Mar, Apr, May, Nov, Dec | 004 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 244 kg/d | Jun–Oct | 004 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 872 kg/d | Jan, Feb, Mar, Apr, May, Nov, Dec | 004 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 367 kg/d | Jun–Oct | 004 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 12 MGD (alert, not enforceable) | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) (alert, not enforceable) | all year | 004 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 611 kg/d | Jun–Oct | 004 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 917 kg/d | Jan, Feb, Mar, Apr, May, Nov, Dec | 004 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 917 kg/d | Jun–Oct | 004 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 1376 kg/d | Jan, Feb, Mar, Apr, May, Nov, Dec | 004 |
Cited limits by parameter: Virginia's rules and the federal ones.
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