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Sewage treatment plant, major discharger, Harrisville, Rhode Island. NPDES permit RI0100455 expired Jun 30, 2025; its limits still apply. Last 12 months: over a limit 12 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Aluminum, total [as Al], monthly average | 208.2 ug/L | ≤ 141.5 ug/L | 47% |
| November 2025 | Copper, total [as Cu], daily maximum | 11 ug/L | ≤ 10.6 ug/L | 4% |
| November 2025 | Copper, total [as Cu], monthly average | 9.8 ug/L | ≤ 8 ug/L | 23% |
| December 2025 | Copper, total [as Cu], daily maximum | 21 ug/L | ≤ 10.6 ug/L | 98% |
| February 2026 | Nitrogen, ammonia total [as N], monthly average | 21.1 mg/L | ≤ 20 mg/L | 6% |
| April 2026 | Aluminum, total [as Al], monthly average | 180.6 ug/L | ≤ 141.5 ug/L | 28% |
| May 2026 | Aluminum, total [as Al], monthly average | 212.3 ug/L | ≤ 141.5 ug/L | 50% |
| June 2026 | Aluminum, total [as Al], monthly average | 265 ug/L | ≤ 141.5 ug/L | 87% |
| July 2026 | Aluminum, total [as Al], monthly average | 264.8 ug/L | ≤ 141.5 ug/L | 87% |
| August 2026 | Aluminum, total [as Al], monthly average | 211.5 ug/L | ≤ 141.5 ug/L | 49% |
| August 2026 | Copper, total [as Cu], daily maximum | 17 ug/L | ≤ 10.6 ug/L | 60% |
| September 2026 | Aluminum, total [as Al], monthly average | 232.4 ug/L | ≤ 141.5 ug/L | 64% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| BOD, 5-day, 20 deg. C | monthly average | ≤ 10 mg/L | May–Oct |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 15 mg/L | May–Oct |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 17 mg/L | May–Oct |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 50 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 125.1 lb/d | May–Oct |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 375.3 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 212.7 lb/d | May–Oct |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 625.5 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | May–Oct |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | weekly average | report only (mg/L) | May–Oct |
| BOD, 5-day, 20 deg. C | weekly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | May–Oct |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) | May–Oct |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | daily maximum | report only (lb/d) | May–Oct |
| BOD, 5-day, 20 deg. C | daily maximum | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec |
| pH | minimum | ≥ 6 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 15 mg/L | May–Oct |
| Solids, total suspended | weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | weekly average | ≤ 20 mg/L | May–Oct |
| Solids, total suspended | daily maximum | ≤ 50 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | daily maximum | ≤ 25 mg/L | May–Oct |
| Solids, total suspended | monthly average | ≤ 375.3 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 187.7 lb/d | May–Oct |
| Solids, total suspended | daily maximum | ≤ 625.5 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | daily maximum | ≤ 312.8 lb/d | May–Oct |
| Solids, total suspended | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | monthly average | report only (mg/L) | May–Oct |
| Solids, total suspended | weekly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | weekly average | report only (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 | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | monthly average | report only (lb/d) | May–Oct |
| Solids, total suspended | daily maximum | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | daily maximum | report only (lb/d) | May–Oct |
| Solids, settleable | monthly average | report only (mL/L) | all year |
| Solids, settleable | weekly average | report only (mL/L) | all year |
| Solids, settleable | daily maximum | report only (mL/L) | all year |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, total [as N] | monthly average | 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) | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | May–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5.1 mg/L | May–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 20 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 42.6 mg/L | May–Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 103 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, nitrite total [as N] | monthly average | report only (mg/L) | May–Oct |
| Nitrogen, nitrite total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | May–Oct |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, nitrate total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, nitrate total [as N] | monthly average | report only (mg/L) | May–Oct |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | May–Oct |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | May–Oct |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | May–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) | Apr–Oct |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Nov, Dec |
| Cadmium, total [as Cd] | monthly average | report only (ug/L) | all year |
| Cadmium, total [as Cd] | daily maximum | report only (ug/L) | all year |
| Copper, total [as Cu] | monthly average | ≤ 5.3 ug/L | all year |
| Copper, total [as Cu] | monthly average | ≤ 8 ug/L | all year |
| Copper, total [as Cu] | daily maximum | ≤ 7.1 ug/L | all year |
| Copper, total [as Cu] | daily maximum | ≤ 10.6 ug/L | all year |
| Iron, total [as Fe] | monthly average | report only (ug/L) | all year |
| Iron, total [as Fe] | monthly average | ≤ 1627.2 ug/L | all year |
| Iron, total [as Fe] | daily maximum | report only (ug/L) | all year |
| Iron, total [as Fe] | daily maximum | report only (ug/L) | all year |
| Lead, total [as Pb] | monthly average | ≤ 1.1 ug/L | all year |
| Lead, total [as Pb] | daily maximum | ≤ 27.5 ug/L | all year |
| Nickel, total [as Ni] | monthly average | report only (ug/L) | all year |
| Nickel, total [as Ni] | daily maximum | report only (ug/L) | all year |
| Zinc, total [as Zn] | monthly average | ≤ 68.3 ug/L | all year |
| Zinc, total [as Zn] | daily maximum | ≤ 68.3 ug/L | all year |
| Aluminum, total [as Al] | monthly average | ≤ 141.5 ug/L | all year |
| Aluminum, total [as Al] | daily maximum | ≤ 1220.4 ug/L | all year |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 1.5 MGD | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Chlorine, total residual | monthly average | ≤ 22 ug/L | all year |
| Chlorine, total residual | daily maximum | ≤ 39 ug/L | all year |
| Phosphorus, ortho | monthly average | report only (mg/L) | Jan, Feb, Mar, Nov, Dec |
| Phosphorus, ortho | daily maximum | report only (mg/L) | Jan, Feb, Mar, Nov, Dec |
| Cyanide, free available | monthly average | report only (ug/L) | all year |
| Cyanide, free available | daily maximum | report only (ug/L) | all year |
| Enterococci | monthly geometric mean | ≤ 54 CFU/100mL | all year |
| Enterococci | daily maximum | ≤ 175 CFU/100mL | all year |
| BOD, 5-day, percent removal | minimum | ≥ 85 % | all year |
| Solids, suspended percent removal | minimum | ≥ 85 % | all year |
| LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia | minimum | ≥ 100 % | all year |
| NOEL Static Renewal 7Day Chronic Ceriodaphnia dubia | minimum | ≥ 55 % | all year |
| IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum | report only (%) | all year |
Cited limits by parameter: Rhode Island's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
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