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Sewage treatment plant, major discharger, Marlborough, Massachusetts. NPDES permit MA0100498, in force until Mar 31, 2027. Last 12 months: over a limit 6 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| January 2026 | Nitrogen, ammonia total [as N], weekly average | 6.37 mg/L | ≤ 4.4 mg/L | 45% |
| March 2026 | E. coli, daily maximum | 2419 CFU/100mL | ≤ 409 CFU/100mL | 491% |
| July 2026 | Phosphorus, total [as P], monthly average | .09 mg/L | ≤ .05 mg/L | 80% |
| August 2026 | Phosphorus, total [as P], monthly average | .12 mg/L | ≤ .05 mg/L | 140% |
| September 2026 | Nitrogen, ammonia total [as N], daily maximum | 1.07 mg/L | ≤ 1 mg/L | 7% |
| September 2026 | Phosphorus, total [as P], monthly average | .09 mg/L | ≤ .05 mg/L | 80% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 001 |
| Oxygen, dissolved percent saturation | minimum | ≥ 80 % | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 8.3 SU | all year | 001 |
| pH | maximum | report only (SU) | all year | 001 |
| Solids, total suspended | monthly average | ≤ 15 mg/L | Apr–Oct | 001 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Solids, total suspended | weekly average | ≤ 20 mg/L | Apr–Oct | 001 |
| Solids, total suspended | weekly average | ≤ 25 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | Apr–Oct | 001 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 688 lb/d | Apr–Oct | 001 |
| Solids, total suspended | monthly average | ≤ 917 lb/d | Jan, Feb, Mar, Nov, Dec | 001 |
| Solids, total suspended | weekly average | ≤ 917 lb/d | Apr–Oct | 001 |
| Solids, total suspended | weekly average | ≤ 1147 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) | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 001 |
| Ammonia nitrogen, total, [as N] 30 day | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .5 mg/L | Apr–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4.4 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ .75 mg/L | Apr–Oct | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 4.4 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1 mg/L | Apr–Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | Apr–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly average | report only (lb/d) | Apr–Oct | 001 |
| Nitrogen, ammonia total [as N] | weekly average | report only (lb/d) | Jan, Feb, Mar, Nov, Dec | 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 | ≤ .05 mg/L | Apr–Oct | 001 |
| Phosphorus, total [as P] | monthly average | ≤ .2 mg/L | Jan, Feb, Mar, Nov, Dec | 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 | ≤ 16 ug/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 | daily maximum | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 5.5 MGD | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | monthly average | ≤ 11 ug/L | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ 19 ug/L | all year | 001 |
| E. coli | monthly geometric mean | ≤ 126 CFU/100mL | all year | 001 |
| E. coli | daily maximum | ≤ 409 CFU/100mL | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 6 mg/L | Apr–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 17 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 9 mg/L | Apr–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 22 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 15 mg/L | Apr–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 30 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 275 lb/d | Apr–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 780 lb/d | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 413 lb/d | Apr–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 1009 lb/d | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| LC50 Static 48Hr Acute Ceriodaphnia dubia | minimum | ≥ 100 % | all year | 001 |
| LC50 Static 48Hr Acute Pimephales promelas | minimum | ≥ 100 % | all year | 001 |
| NOEL Static Renewal 7Day Chronic Ceriodaphnia dubia | minimum | ≥ 99 % | all year | 001 |
| Noel Statre 7Day Chronic Pimephales | minimum | ≥ 99 % | 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 |
| 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 |
| Perfluorononanoic acid (PFNA) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluorononanoic acid (PFNA) | daily maximum | report only (ng/g) | 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/MA0100498 · MCP: https://passage-data.com/mcp