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Sewage treatment plant, major discharger, Attleboro, Massachusetts. NPDES permit MA0100595 expired Sep 30, 2013; its limits still apply. Last 12 months: over a limit 13 times (last April 2026), 1 of 16 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Nitrogen, ammonia total [as N], daily maximum | 10.6 mg/L | ≤ 2.5 mg/L | 324% |
| October 2025 | Nitrogen, ammonia total [as N], monthly average | 200 lb/d | ≤ 108 lb/d | 85% |
| October 2025 | Nitrogen, ammonia total [as N], monthly average | 6 mg/L | ≤ 1.5 mg/L | 300% |
| October 2025 | Nitrogen, ammonia total [as N], weekly average | 163 lb/d | ≤ 108 lb/d | 51% |
| October 2025 | Nitrogen, ammonia total [as N], weekly average | 5.1 mg/L | ≤ 1.5 mg/L | 240% |
| October 2025 | Nitrogen, total [as N], monthly average | 11.2 mg/L | ≤ 8 mg/L | 40% |
| November 2025 | NOEL Static Renewal 7Day Chronic Ceriodaphnia dubia, daily minimum | 50 % | ≥ 71 % | 30% |
| February 2026 | NOEL Static Renewal 7Day Chronic Ceriodaphnia dubia, daily minimum | 50 % | ≥ 71 % | 30% |
| March 2026 | Solids, total suspended, daily maximum | 4861 lb/d | ≤ 2153 lb/d | 126% |
| March 2026 | Solids, total suspended, daily maximum | 55 mg/L | ≤ 30 mg/L | 83% |
| March 2026 | Solids, total suspended, weekly average | 2025 lb/d | ≤ 1794 lb/d | 13% |
| April 2026 | Solids, total suspended, daily maximum | 3814 lb/d | ≤ 2153 lb/d | 77% |
| April 2026 | Solids, total suspended, daily maximum | 67 mg/L | ≤ 30 mg/L | 123% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | minimum | ≥ 6 mg/L | all year |
| pH | minimum | ≥ 6.5 SU | all year |
| pH | maximum | ≤ 8.3 SU | all year |
| Solids, total suspended | monthly average | ≤ 15 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 5 mg/L | May–Oct |
| Solids, total suspended | weekly average | ≤ 25 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | weekly average | ≤ 5 mg/L | May–Oct |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | daily maximum | ≤ 15 mg/L | May–Oct |
| Solids, total suspended | monthly average | ≤ 1077 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 359 lb/d | May–Oct |
| Solids, total suspended | daily maximum | ≤ 2153 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | daily maximum | ≤ 1077 lb/d | May–Oct |
| Solids, total suspended | monthly average | report only (mg/L) | all year |
| Solids, total suspended | monthly average | report only (lb/d) | all year |
| Solids, total suspended | weekly average | ≤ 359 lb/d | May–Oct |
| Solids, total suspended | weekly average | ≤ 1794 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, total [as N] | monthly average | ≤ 8 mg/L | May–Oct |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, total [as N] | monthly average | ≤ 33 mg/L | May–Oct |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | May–Oct |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | May–Oct |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | May–Oct |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | May–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 12.5 mg/L | Jan, Feb, Mar, Apr, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 8.3 mg/L | Nov |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4.2 mg/L | May |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 1.5 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.5 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 108 lb/d | Jun–Oct |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 108 lb/d | Jun–Oct |
| Phosphorus, total [as P] | monthly average | ≤ .1 mg/L | Apr–Oct |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | Jan, Feb, Mar, Nov, Dec |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Nov, Dec |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Apr–Oct |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | Apr–Oct |
| Phosphate, ortho, dissolved [as P] | monthly average | report only (mg/L) | Jan, Feb, Mar, Nov, Dec |
| Phosphate, ortho, dissolved [as P] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Nov, Dec |
| Nickel, total recoverable | monthly average | ≤ 73.1 ug/L | all year |
| Silver total recoverable | daily maximum | ≤ 5.3 ug/L | all year |
| Aluminum, total recoverable | monthly average | ≤ 122 ug/L | all year |
| Aluminum, total recoverable | daily maximum | ≤ 950 ug/L | all year |
| Cadmium, total recoverable | monthly average | ≤ .4 ug/L | all year |
| Cadmium, total recoverable | daily maximum | ≤ 2.9 ug/L | all year |
| Lead, total recoverable | monthly average | ≤ 4.5 ug/L | all year |
| Copper, total recoverable | monthly average | ≤ 13 ug/L | all year |
| Copper, total recoverable | daily maximum | ≤ 19.6 ug/L | all year |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | rolling average | ≤ 8.6 MGD | all year |
| Chlorine, total residual | monthly average | ≤ 15.4 ug/L | all year |
| Chlorine, total residual | daily maximum | ≤ 26.6 ug/L | all year |
| Coliform, fecal general | monthly geometric mean | ≤ 200 #/100mL | all year |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | all year |
| Cyanide, total recoverable | monthly average | ≤ 6.3 ug/L | all year |
| Cyanide, total recoverable | daily maximum | ≤ 30.8 ug/L | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 5 mg/L | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 15 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 5 mg/L | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 25 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 15 mg/L | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 359 lb/d | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 1077 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 1077 lb/d | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 2153 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (lb/d) | all year |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 1794 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 359 lb/d | May–Oct |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year |
| LC50 Static 48Hr Acute Ceriodaphnia dubia | daily minimum | ≥ 100 % | Feb, May, Aug, Nov |
| NOEL Static Renewal 7Day Chronic Ceriodaphnia dubia | daily minimum | ≥ 71 % | Feb, May, Aug, Nov |
Cited limits by parameter: Massachusetts's rules and the federal ones.
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