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Nonresidential Building Operators, major discharger, North Attleborough, Massachusetts. NPDES permit MA0030244 expired Jan 31, 2023; its limits still apply. Last 12 months: no values over a limit, 48 required values missing. 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 | ≤ 30 mg/L | all year | 001 |
| Oil & Grease | daily maximum | ≤ 5 mg/L | all year | 001 |
| Copper, total [as Cu] | daily maximum | ≤ 7.3 ug/L | all year | 001 |
| Lead, total [as Pb] | daily maximum | ≤ 20 ug/L | all year | 001 |
| Zinc, total [as Zn] | daily maximum | ≤ 65 ug/L | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 002 |
| pH | daily maximum | ≤ 8.3 SU | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 002 |
| Oil & Grease | daily maximum | ≤ 5 mg/L | all year | 002 |
| Copper, total [as Cu] | daily maximum | ≤ 7.3 ug/L | all year | 002 |
| Lead, total [as Pb] | daily maximum | ≤ 20 ug/L | all year | 002 |
| Zinc, total [as Zn] | daily maximum | ≤ 65 ug/L | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
Cited limits by parameter: Massachusetts's rules and the federal ones.
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