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Aircraft Parts And Equipment, major discharger, North Grafton, Massachusetts. NPDES permit MA0004341 expired Nov 30, 2012; its limits still apply. Last 12 months: no values over a limit, 21 required values missing, 33 of 37 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 8.3 SU | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 62 mg/L | all year | 001 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 001 |
| Copper, total [as Cu] | daily maximum | ≤ .0073 mg/L | all year | 001 |
| Aluminum, total [as Al] | monthly average | report only (mg/L) | all year | 001 |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | all year | 001 |
| Trichloroethylene | monthly average | report only (ug/L) | all year | 001 |
| Trichloroethylene | daily maximum | report only (ug/L) | all year | 001 |
| Tetrachloroethylene | monthly average | report only (ug/L) | all year | 001 |
| Tetrachloroethylene | daily maximum | report only (ug/L) | all year | 001 |
| LC50 Static 48Hr Acute Ceriodaphnia dubia | daily minimum | ≥ 100 % | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 007 |
| pH | maximum | ≤ 8.3 SU | all year | 007 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 007 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 007 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 007 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 007 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 007 |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | all year | 007 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 007 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 007 |
| pH | minimum | ≥ 6.5 SU | all year | 008 |
| pH | maximum | ≤ 8.3 SU | all year | 008 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 008 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 008 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 008 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 008 |
| Iron, total [as Fe] | daily maximum | ≤ 1.01 mg/L | all year | 008 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 008 |
| Zinc, total [as Zn] | daily maximum | ≤ .067 mg/L | all year | 008 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 008 |
| Aluminum, total [as Al] | daily maximum | ≤ .76 mg/L | all year | 008 |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | all year | 008 |
| Flow, in conduit or thru treatment plant | monthly average | report only (gal/d) | all year | 008 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (gal/d) | all year | 008 |
| pH | minimum | ≥ 6.5 SU | all year | 009 |
| pH | daily maximum | ≤ 8.3 SU | all year | 009 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 009 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 009 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 009 |
| Copper, total [as Cu] | daily maximum | ≤ .0073 mg/L | all year | 009 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 009 |
| Iron, total [as Fe] | daily maximum | ≤ 1 mg/L | all year | 009 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 009 |
| Aluminum, total [as Al] | daily maximum | ≤ .75 mg/L | all year | 009 |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | all year | 009 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 009 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 009 |
| pH | minimum | ≥ 6.5 SU | all year | 010 |
| pH | maximum | ≤ 8.3 SU | all year | 010 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 010 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 010 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 010 |
| Copper, total [as Cu] | monthly average | report only (mg/L) | all year | 010 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 010 |
| Iron, total [as Fe] | monthly average | report only (mg/L) | all year | 010 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 010 |
| Lead, total [as Pb] | monthly average | report only (mg/L) | all year | 010 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 010 |
| Nickel, total [as Ni] | monthly average | report only (mg/L) | all year | 010 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 010 |
| Aluminum, total [as Al] | monthly average | report only (mg/L) | all year | 010 |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | all year | 010 |
| Trichloroethylene | monthly average | report only (ug/L) | all year | 010 |
| Trichloroethylene | daily maximum | report only (ug/L) | all year | 010 |
| Tetrachloroethylene | monthly average | report only (ug/L) | all year | 010 |
| Tetrachloroethylene | daily maximum | report only (ug/L) | all year | 010 |
| LC50 Static 48Hr Acute Ceriodaphnia dubia | daily minimum | ≥ 100 % | all year | 010 |
Cited limits by parameter: Massachusetts's rules and the federal ones.
Same industry: the 4 Transportation Equipment permits in Massachusetts.
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