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Electric Services, major discharger, Londonderry, Township Of, Pennsylvania. NPDES permit PA0009920 expired Oct 31, 2012; its limits still apply. Last 12 months: no values over a limit, 57 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | daily maximum | ≤ 110 deg F | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 115 deg F | Apr–Sep | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 001 |
| Oxidants, total residual | daily maximum | ≤ .14 mg/L | 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 |
| Chlorine, free available | daily maximum | ≤ .2 mg/L | all year | 001 |
| Spectrus CT 1300 | daily maximum | ≤ .1 mg/L | all year | 001 |
| Hydrazine | instantaneous maximum | < .01 mg/L | all year | 001 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 110 deg F | Jan, Feb, Mar, Oct, Nov, Dec | 003 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 115 deg F | Apr–Sep | 003 |
| pH | minimum | ≥ 6 SU | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| Oxidants, total residual | daily maximum | ≤ .14 mg/L | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Chlorine, free available | daily maximum | ≤ .2 mg/L | all year | 003 |
| Spectrus CT 1300 | daily maximum | ≤ .1 mg/L | all year | 003 |
| Hydrazine | instantaneous maximum | < .01 mg/L | all year | 003 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 004 |
| pH | minimum | ≥ 6 SU | all year | 004 |
| pH | maximum | ≤ 9 SU | all year | 004 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 004 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 004 |
| Oxidants, total residual | daily maximum | ≤ .14 mg/L | all year | 004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| Chlorine, free available | daily maximum | ≤ .2 mg/L | all year | 004 |
| Spectrus CT 1300 | daily maximum | ≤ .1 mg/L | all year | 004 |
| Hydrazine | instantaneous maximum | < .01 mg/L | all year | 004 |
| pH | minimum | ≥ 6 SU | all year | 005 |
| pH | maximum | ≤ 9 SU | all year | 005 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 005 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 005 |
| Oil & Grease | monthly average | ≤ 15 mg/L | all year | 005 |
| Oil & Grease | daily maximum | ≤ 20 mg/L | all year | 005 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 005 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 005 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 101 |
| Phosphorus, total [as P] | monthly average | ≤ 2 mg/L | all year | 101 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 101 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 101 |
| Coliform, fecal general | geometric mean | ≤ 200 #/100mL | May–Sep | 101 |
| Coliform, fecal general | geometric mean | ≤ 2000 #/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 101 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | 101 |
| pH | minimum | ≥ 6 SU | all year | 401 |
| pH | maximum | ≤ 9 SU | all year | 401 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 401 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 401 |
| Oil & Grease | monthly average | ≤ 15 mg/L | all year | 401 |
| Oil & Grease | daily maximum | ≤ 20 mg/L | all year | 401 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 401 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 401 |
| pH | minimum | ≥ 6 SU | all year | 501 |
| pH | maximum | ≤ 9 SU | all year | 501 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 501 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 501 |
| Oil & Grease | monthly average | ≤ 15 mg/L | all year | 501 |
| Oil & Grease | daily maximum | ≤ 20 mg/L | all year | 501 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 501 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 501 |
| pH | minimum | ≥ 6 SU | all year | 701 |
| pH | maximum | ≤ 9 SU | all year | 701 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 701 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 701 |
| Oil & Grease | monthly average | ≤ 15 mg/L | all year | 701 |
| Oil & Grease | daily maximum | ≤ 20 mg/L | all year | 701 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 701 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 701 |
Cited limits by parameter: Pennsylvania's rules and the federal ones.
Same industry: the 63 Electric Services permits in Pennsylvania.
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