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Sewage treatment plant, major discharger, Medway, Massachusetts. NPDES permit MA0102598 expired Oct 31, 2019; its limits still apply. Last 12 months: over a limit 11 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Copper, total [as Cu], monthly average | 14.3 ug/L | ≤ 13 ug/L | 10% |
| November 2025 | Copper, total [as Cu], monthly average | 15.9 ug/L | ≤ 13 ug/L | 22% |
| December 2025 | Copper, total [as Cu], monthly average | 17.3 ug/L | ≤ 13 ug/L | 33% |
| January 2026 | Copper, total [as Cu], monthly average | 14.8 ug/L | ≤ 13 ug/L | 14% |
| February 2026 | Copper, total [as Cu], monthly average | 14.4 ug/L | ≤ 13 ug/L | 11% |
| March 2026 | Copper, total [as Cu], monthly average | 16.3 ug/L | ≤ 13 ug/L | 25% |
| April 2026 | Phosphorus, total [as P], monthly average | .11 mg/L | ≤ .1 mg/L | 10% |
| July 2026 | Phosphorus, total [as P], monthly average | .17 mg/L | ≤ .1 mg/L | 70% |
| August 2026 | Phosphorus, total [as P], monthly average | .16 mg/L | ≤ .1 mg/L | 60% |
| September 2026 | Nitrogen, ammonia total [as N], daily maximum | 2.53 mg/L | ≤ 2 mg/L | 27% |
| September 2026 | Phosphorus, total [as P], monthly average | .13 mg/L | ≤ .1 mg/L | 30% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily 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 | ≤ 7 mg/L | May–Oct |
| Solids, total suspended | weekly average | ≤ 25 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | weekly average | ≤ 10 mg/L | May–Oct |
| Solids, total suspended | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | daily maximum | report only (mg/L) | May–Oct |
| Solids, total suspended | monthly average | ≤ 570 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 265 lb/d | May–Oct |
| Solids, total suspended | weekly average | ≤ 950 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | weekly average | ≤ 380 lb/d | May–Oct |
| Solids, total suspended | monthly average | report only (mg/L) | all year |
| Solids, total suspended | weekly average | report only (lb/d) | all year |
| Solids, total suspended | weekly average | ≤ 950 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | weekly average | ≤ 380 lb/d | May–Oct |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 10 mg/L | Apr |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5 mg/L | May |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 15 mg/L | Apr |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 7.5 mg/L | May |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 1.5 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | Jan, Feb, Mar, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 380 lb/d | Apr |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 190 lb/d | May |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 38 lb/d | Jun–Oct |
| Nitrogen, ammonia total [as N] | weekly average | report only (lb/d) | Jan, Feb, Mar, Nov, Dec |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 570 lb/d | Apr |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 285 lb/d | May |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 57 lb/d | Jun–Oct |
| Phosphorus, total [as P] | monthly average | ≤ .3 mg/L | Jan, Feb, Mar, Nov, Dec |
| Phosphorus, total [as P] | monthly average | ≤ .1 mg/L | Apr–Oct |
| Copper, total [as Cu] | monthly average | ≤ 13 ug/L | all year |
| Copper, total [as Cu] | daily maximum | ≤ 23 ug/L | all year |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 4.5 MGD | Jul–Sep |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | Jul–Sep |
| Flow, in conduit or thru treatment plant | 12-month average | ≤ 5.7 MGD | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Chlorine, total residual | monthly average | ≤ 17 ug/L | Mar–Nov |
| Chlorine, total residual | average | report only (ug/L) | Mar–Nov |
| Chlorine, total residual | daily maximum | ≤ 30 ug/L | Mar–Nov |
| E. coli, colony forming units [CFU] | monthly average | ≤ 126 CFU/100mL | Mar–Nov |
| E. coli, colony forming units [CFU] | daily maximum | ≤ 409 CFU/100mL | Mar–Nov |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 7 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 | ≤ 10 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 | report only (mg/L) | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 265 lb/d | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 570 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (lb/d) | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (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] | average | report only (lb/d) | all year |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 380 lb/d | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 950 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| 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 % | Jan, Apr, Jul, Oct |
| LC50 Static 48Hr Acute Pimephales promelas | daily minimum | ≥ 100 % | Jan, Apr, Jul, Oct |
| NOEL Static Renewal 7Day Chronic Ceriodaphnia dubia | daily minimum | ≥ 63 % | Jan, Apr, Jul, Oct |
| Noel Statre 7Day Chronic Pimephales | daily minimum | ≥ 63 % | Jan, Apr, Jul, Oct |
Cited limits by parameter: Massachusetts's rules and the federal ones.
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