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Sewage treatment plant, West Chester, Pennsylvania. NPDES permit PA0050504, in force until Mar 31, 2027. Last 12 months: no values over a limit, 50 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) | all year | 001 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 001 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 10 mg/L | all year | 001 |
| Solids, total suspended | weekly average | ≤ 15 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 62 lb/d | all year | 001 |
| Solids, total suspended | weekly average | ≤ 94 lb/d | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.5 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 7 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 16 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 44 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Phosphorus, total [as P] | monthly average | ≤ .5 mg/L | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 3 lb/d | all year | 001 |
| Copper, total [as Cu] | quarterly average | report only (mg/L) | all year | 001 |
| Copper, total [as Cu] | quarterly average | report only (lb/d) | all year | 001 |
| Zinc, total [as Zn] | quarterly average | report only (mg/L) | all year | 001 |
| Zinc, total [as Zn] | quarterly average | report only (lb/d) | all year | 001 |
| Ultraviolet light intensity | daily minimum | report only (mW/cm2) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| E. coli | instantaneous maximum | report only (#/100mL) | all year | 001 |
| Coliform, fecal general | geometric mean | ≤ 200 #/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| Coliform, fecal general | geometric mean | ≤ 200 #/100mL | May–Sep | 001 |
| Coliform, fecal general | instantaneous maximum | ≤ 1000 #/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| Coliform, fecal general | instantaneous maximum | ≤ 1000 #/100mL | May–Sep | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 20 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 15 mg/L | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 125 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 62 lb/d | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 188 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 94 lb/d | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (lb/d) | all year | 001 |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | all year | 002 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 002 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | ≤ 10 mg/L | all year | 002 |
| Solids, total suspended | weekly average | ≤ 15 mg/L | all year | 002 |
| Solids, total suspended | monthly average | ≤ 62 lb/d | all year | 002 |
| Solids, total suspended | weekly average | ≤ 94 lb/d | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.5 mg/L | May–Oct | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 7 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 16 lb/d | May–Oct | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 44 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Phosphorus, total [as P] | monthly average | ≤ .5 mg/L | all year | 002 |
| Phosphorus, total [as P] | monthly average | ≤ 3 lb/d | all year | 002 |
| Copper, total [as Cu] | quarterly average | report only (mg/L) | all year | 002 |
| Copper, total [as Cu] | quarterly average | report only (lb/d) | all year | 002 |
| Zinc, total [as Zn] | quarterly average | report only (mg/L) | all year | 002 |
| Zinc, total [as Zn] | quarterly average | report only (lb/d) | all year | 002 |
| Ultraviolet light intensity | daily minimum | report only (mW/cm2) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| E. coli | instantaneous maximum | report only (#/100mL) | all year | 002 |
| Coliform, fecal general | geometric mean | ≤ 200 #/100mL | May–Sep | 002 |
| Coliform, fecal general | geometric mean | ≤ 200 #/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 002 |
| Coliform, fecal general | instantaneous maximum | ≤ 1000 #/100mL | May–Sep | 002 |
| Coliform, fecal general | instantaneous maximum | ≤ 1000 #/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | May–Oct | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 20 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 15 mg/L | May–Oct | 002 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 62 lb/d | May–Oct | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 125 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 94 lb/d | May–Oct | 002 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 188 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
Cited limits by parameter: Pennsylvania'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/PA0050504 · MCP: https://passage-data.com/mcp