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Sewage treatment plant, major discharger, Millbury, Massachusetts. NPDES permit MA0102369 expired Sep 30, 2013; its limits still apply. Last 12 months: over a limit 12 times (last September 2026), 1 of 28 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| April 2026 | Phosphorus, total [as P], rolling average | .19 mg/L | ≤ .1 mg/L | 90% |
| May 2026 | Phosphorus, total [as P], rolling average | .22 mg/L | ≤ .1 mg/L | 120% |
| June 2026 | Phosphorus, total [as P], rolling average | .28 mg/L | ≤ .1 mg/L | 180% |
| July 2026 | Cadmium, total [as Cd], daily maximum | 5 ug/L | ≤ 1.5 ug/L | 233% |
| July 2026 | Cadmium, total [as Cd], monthly average | .96 ug/L | ≤ .5 ug/L | 92% |
| July 2026 | Nitrogen, total [as N], monthly average | 5.46 mg/L | ≤ 5 mg/L | 9% |
| July 2026 | Phosphorus, total [as P], rolling average | .36 mg/L | ≤ .1 mg/L | 260% |
| August 2026 | Nitrogen, total [as N], monthly average | 5.08 mg/L | ≤ 5 mg/L | 2% |
| August 2026 | Phosphorus, total [as P], rolling average | .35 mg/L | ≤ .1 mg/L | 250% |
| September 2026 | NOEL Static Renewal 7Day Chronic Ceriodaphnia dubia, daily minimum | 6.25 % | ≥ 90 % | 93% |
| September 2026 | Nitrogen, total [as N], monthly average | 5.31 mg/L | ≤ 5 mg/L | 6% |
| September 2026 | Phosphorus, total [as P], rolling average | .27 mg/L | ≤ .1 mg/L | 170% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 8.3 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 15 mg/L | Jun–Oct | 001 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | May | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Solids, total suspended | weekly average | ≤ 15 mg/L | Jun–Oct | 001 |
| Solids, total suspended | weekly average | ≤ 30 mg/L | May | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Solids, total suspended | daily maximum | ≤ 22 mg/L | Jun–Oct | 001 |
| Solids, total suspended | daily maximum | ≤ 33 mg/L | May | 001 |
| Solids, total suspended | daily maximum | ≤ 50 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 7006 lb/d | Jun–Oct | 001 |
| Solids, total suspended | monthly average | ≤ 14011 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 9341 lb/d | May | 001 |
| Solids, total suspended | weekly average | report only (lb/d) | Jun–Oct | 001 |
| Solids, total suspended | weekly average | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Solids, total suspended | weekly average | report only (lb/d) | May | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | weekly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 001 |
| Solids, total suspended | weekly average | report only (lb/d) | all year | 001 |
| Nitrogen, total [as N] | monthly average | ≤ 5 mg/L | May–Oct | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, total [as N] | monthly average | ≤ 6 mg/L | May–Oct | 001 |
| Nitrogen, total [as N] | weekly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | May–Oct | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | May–Oct | 001 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | May–Oct | 001 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | May–Oct | 001 |
| Nitrogen, total [as N] | weekly average | report only (lb/d) | May–Oct | 001 |
| Nitrogen, total [as N] | weekly average | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, total [as N] | weekly average | report only (lb/d) | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 12 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 10 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2 mg/L | Jun–Oct | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 24 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 20 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 10 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 4 mg/L | Jun–Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jun–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 934 lb/d | Jun–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5600 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2330 lb/d | May | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4670 lb/d | Nov | 001 |
| Nitrogen, ammonia total [as N] | weekly average | report only (lb/d) | Jun–Oct | 001 |
| Nitrogen, ammonia total [as N] | weekly average | report only (lb/d) | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly average | report only (lb/d) | May | 001 |
| Nitrogen, ammonia total [as N] | weekly average | report only (lb/d) | Nov | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | all year | 001 |
| Nitrogen, ammonia total [as N] | weekly average | report only (lb/d) | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Phosphorus, total [as P] | rolling average | ≤ .1 mg/L | Apr–Oct | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Jan, Feb, Mar, Nov, Dec | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Apr | 001 |
| Phosphorus, total [as P] | weekly average | report only (mg/L) | Apr–Oct | 001 |
| Phosphorus, total [as P] | weekly average | report only (mg/L) | Jan, Feb, Mar, Nov, Dec | 001 |
| Phosphorus, total [as P] | weekly average | report only (mg/L) | Apr | 001 |
| Phosphorus, total [as P] | weekly average | report only (mg/L) | Jan, Feb, Mar, Nov, Dec | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Nov, Dec | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Apr–Oct | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Nov, Dec | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Apr | 001 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | Apr–Oct | 001 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | Jan, Feb, Mar, Nov, Dec | 001 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | Jan, Feb, Mar, Nov, Dec | 001 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | Apr | 001 |
| Phosphorus, total [as P] | weekly average | report only (lb/d) | Apr–Oct | 001 |
| Phosphorus, total [as P] | weekly average | report only (lb/d) | Jan, Feb, Mar, Nov, Dec | 001 |
| Phosphorus, total [as P] | weekly average | report only (lb/d) | Jan, Feb, Mar, Nov, Dec | 001 |
| Phosphorus, total [as P] | weekly average | report only (lb/d) | Apr | 001 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | Apr–Oct | 001 |
| Phosphorus, total [as P] | weekly average | report only (lb/d) | Apr–Oct | 001 |
| Phosphate, ortho, dissolved [as P] | monthly average | report only (mg/L) | Jan, Feb, Mar, Nov, Dec | 001 |
| Phosphate, ortho, dissolved [as P] | weekly average | report only (mg/L) | Jan, Feb, Mar, Nov, Dec | 001 |
| Phosphate, ortho, dissolved [as P] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Nov, Dec | 001 |
| Phosphate, ortho, dissolved [as P] | monthly average | report only (lb/d) | Jan, Feb, Mar, Nov, Dec | 001 |
| Phosphate, ortho, dissolved [as P] | weekly average | report only (lb/d) | Jan, Feb, Mar, Nov, Dec | 001 |
| Cadmium, total [as Cd] | monthly average | ≤ .5 ug/L | all year | 001 |
| Cadmium, total [as Cd] | daily maximum | ≤ 1.5 ug/L | all year | 001 |
| Copper, total [as Cu] | monthly average | ≤ 7.2 ug/L | all year | 001 |
| Copper, total [as Cu] | daily maximum | ≤ 10.2 ug/L | all year | 001 |
| Lead, total [as Pb] | monthly average | report only (mg/L) | all year | 001 |
| Nickel, total [as Ni] | monthly average | report only (mg/L) | all year | 001 |
| Zinc, total [as Zn] | monthly average | ≤ 91.3 ug/L | all year | 001 |
| Zinc, total [as Zn] | daily maximum | ≤ 91.3 ug/L | all year | 001 |
| Aluminum, total [as Al] | monthly average | ≤ 87 ug/L | all year | 001 |
| Aluminum, total [as Al] | daily maximum | report only (ug/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | 12-month average | ≤ 56 MGD | 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, total residual | monthly average | ≤ 20 ug/L | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ 21 ug/L | all year | 001 |
| Chlorine, total residual | monthly average | report only (mg/L) | all year | 001 |
| Chlorine, total residual | daily maximum | report only (mg/L) | all year | 001 |
| Coliform, fecal general | monthly geometric mean | ≤ 200 #/100mL | Apr–Oct | 001 |
| Coliform, fecal general | monthly geometric mean | ≤ 571 CFU/100mL | Jan, Feb, Mar, Nov, Dec | 001 |
| Coliform, fecal general | monthly geometric mean | ≤ 200 CFU/100mL | Apr–Oct | 001 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | Apr–Oct | 001 |
| Coliform, fecal general | daily maximum | ≤ 1429 CFU/100mL | Jan, Feb, Mar, Nov, Dec | 001 |
| Coliform, fecal general | daily maximum | ≤ 400 CFU/100mL | Apr–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | Jun–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 20 mg/L | May | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 15 mg/L | Jun–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 30 mg/L | May | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 17 mg/L | Jun–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 33 mg/L | May | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 4670 lb/d | Jun–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 9341 lb/d | May | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 11676 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | report only (lb/d) | May | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | report only (lb/d) | Jun–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | report only (mg/L) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (lb/d) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | report only (lb/d) | all year | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | Jan, Feb, Mar, Apr, May, Nov, Dec | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | Jun–Oct | 001 |
| LC50 Static 48Hr Acute Ceriodaphnia dubia | daily minimum | ≥ 100 % | all year | 001 |
| LC50 Static 48Hr Acute Pimephales promelas | daily minimum | ≥ 100 % | all year | 001 |
| NOEL Static Renewal 7Day Chronic Ceriodaphnia dubia | daily minimum | ≥ 90 % | all year | 001 |
| Noel Statre 7Day Chronic Pimephales | daily minimum | ≥ 90 % | all year | 001 |
| LC50 Static 48Hr Acute Ceriodaphnia dubia | daily minimum | report only (%) | all year | 001T |
| LC50 Static 48Hr Acute Pimephales promelas | daily minimum | report only (%) | all year | 001T |
Cited limits by parameter: Massachusetts's rules and the federal ones.
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