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Sewage treatment plant, major discharger, Westborough, Massachusetts. NPDES permit MA0100412, in force until Apr 30, 2027. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | Apr–Oct | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 10 mg/L | Apr–Oct | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 10 mg/L | Apr–Oct | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 15 mg/L | Apr–Oct | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 640 lb/d | Apr–Oct | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 640 lb/d | Apr–Oct | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 8.3 SU | all year | 001 |
| pH | daily maximum | report only (SU) | all year | 001 |
| Solids, total suspended | monthly average | ≤ 15 mg/L | Apr–Oct | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Solids, total suspended | weekly average | ≤ 15 mg/L | Apr–Oct | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Solids, total suspended | daily maximum | ≤ 25 mg/L | Apr–Oct | 001 |
| Solids, total suspended | daily maximum | report only (mg/L) | Jan, Feb, Mar, Nov, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 960 lb/d | Apr–Oct | 001 |
| Solids, total suspended | monthly average | ≤ 1920 lb/d | Jan, Feb, Mar, Nov, Dec | 001 |
| Solids, total suspended | weekly average | ≤ 960 lb/d | Apr–Oct | 001 |
| Solids, total suspended | weekly average | ≤ 2880 lb/d | Jan, Feb, Mar, Nov, Dec | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Apr–Oct | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | Apr–Oct | 001 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5.1 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1 mg/L | Jun–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.6 mg/L | Apr, May | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 1 mg/L | Jun–Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.5 mg/L | Jun–Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Apr, May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | Jun–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | Apr, May | 001 |
| Nitrogen, ammonia total [as N] | weekly average | report only (lb/d) | Jun–Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | Apr–Oct | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Apr–Oct | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | Apr–Oct | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | Apr–Oct | 001 |
| Phosphorus, total [as P] | monthly average | ≤ .1 mg/L | Apr–Oct | 001 |
| Phosphorus, total [as P] | monthly average | ≤ .2 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] | 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] | daily maximum | report only (lb/d) | Apr–Oct | 001 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | Jan, Feb, Mar, Nov, Dec | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Apr–Oct | 001 |
| Carbon, tot organic [TOC] | daily maximum | report only (mg/L) | all year | 001 |
| Carbon, tot organic [TOC] | daily maximum | report only (mg/L) | all year | 001 |
| Carbon, dissolved organic [as C] | daily maximum | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 001 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 001 |
| Copper, total [as Cu] | monthly average | ≤ .016 mg/L | all year | 001 |
| Copper, total [as Cu] | daily maximum | ≤ .016 mg/L | all year | 001 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 001 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 001 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 001 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 001 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 001 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 001 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 001 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 001 |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | all year | 001 |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | rolling average | ≤ 7.68 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 | ≤ .011 mg/L | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .019 mg/L | all year | 001 |
| E. coli | monthly average | ≤ 126 CFU/100mL | all year | 001 |
| E. coli | daily maximum | ≤ 409 CFU/100mL | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 1600 lb/d | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 2560 lb/d | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, 5-day, percent removal | monthly minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly minimum | ≥ 85 % | all year | 001 |
| LC50 Static 48Hr Acute Ceriodaphnia dubia | minimum | ≥ 100 % | all year | 001 |
| NOEL Static 7Day Chronic Ceriodaphnia dubia | minimum | ≥ 100 % | all year | 001 |
| Perfluorooctanoic acid (PFOA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorooctanoic acid (PFOA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorooctanoic acid (PFOA) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluorooctanesulfonate | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorooctanesulfonate | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluoroheptanoic acid (PFHpA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluoroheptanoic acid (PFHpA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluoroheptanoic acid (PFHpA) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluorononanoic acid (PFNA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorodecanoic acid (PFDA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorodecanoic acid (PFDA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorodecanoic acid (PFDA) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluorohexanesulfonic acid (PFHxS) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorohexanesulfonic acid (PFHxS) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorohexanesulfonic acid (PFHxS) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluorooctanesulfonic acid (PFOS) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorooctanesulfonic acid (PFOS) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorooctanesulfonic acid (PFOS) | daily maximum | report only (ng/g) | all year | PFAS |
Cited limits by parameter: Massachusetts's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/MA0100412 · MCP: https://passage-data.com/mcp