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Sewage treatment plant, major discharger, Warwick, Rhode Island. NPDES permit RI0100234 expired Dec 31, 2024; its limits still apply. Last 12 months: over a limit 2 times (last December 2025), 1 of 20 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia, minimum | 82 % | ≥ 100 % | 18% |
| December 2025 | NOEL Static Renewal 7Day Chronic Ceriodaphnia dubia, minimum | 25 % | ≥ 50 % | 50% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | minimum | ≥ 6 mg/L | Jun–Oct |
| pH | minimum | ≥ 6 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| Solids, total suspended | monthly average | ≤ 25 mg/L | Jun, Oct |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 20 mg/L | Jul–Sep |
| Solids, total suspended | weekly average | ≤ 25 mg/L | Jun, Oct |
| Solids, total suspended | weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Solids, total suspended | weekly average | ≤ 20 mg/L | Jul–Sep |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | Jun, Oct |
| Solids, total suspended | daily maximum | ≤ 50 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | Jul–Sep |
| Solids, total suspended | monthly average | ≤ 1605 lb/d | Jun, Oct |
| Solids, total suspended | monthly average | ≤ 1927 lb/d | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 1284 lb/d | Jul–Sep |
| Solids, total suspended | daily maximum | ≤ 1927 lb/d | Jun, Oct |
| Solids, total suspended | daily maximum | ≤ 3211 lb/d | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Solids, total suspended | daily maximum | ≤ 1927 lb/d | Jul–Sep |
| Solids, total suspended | monthly average | report only (mg/L) | all year |
| Solids, total suspended | weekly average | report only (mg/L) | all year |
| Solids, total suspended | daily maximum | report only (mg/L) | all year |
| Solids, total suspended | monthly average | report only (lb/d) | all year |
| Solids, total suspended | daily maximum | report only (lb/d) | 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 | ≤ 8 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 | ≤ 514 lb/d | May–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5.2 mg/L | May |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 13.5 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, ammonia total [as N] | weekly average | report only (mg/L) | May |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 2 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | weekly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 61 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 60.4 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 |
| Chromium, hexavalent [as Cr] | monthly average | report only (ug/L) | all year |
| Chromium, hexavalent [as Cr] | daily maximum | report only (ug/L) | all year |
| Copper, total [as Cu] | monthly average | report only (ug/L) | all year |
| Copper, total [as Cu] | daily maximum | report only (ug/L) | all year |
| Iron, total [as Fe] | monthly average | ≤ 1520 ug/L | all year |
| Iron, total [as Fe] | daily maximum | report only (ug/L) | all year |
| Lead, total [as Pb] | monthly average | ≤ 3 ug/L | all year |
| Lead, total [as Pb] | daily maximum | ≤ 8.7 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 | report only (ug/L) | all year |
| Zinc, total [as Zn] | daily maximum | report only (ug/L) | all year |
| Aluminum, total [as Al] | monthly average | ≤ 125 ug/L | all year |
| Aluminum, total [as Al] | monthly average | ≤ 684 ug/L | all year |
| Aluminum, total [as Al] | daily maximum | ≤ 1080 ug/L | all year |
| Aluminum, total [as Al] | daily maximum | ≤ 1031 ug/L | all year |
| Chloroform | monthly average | ≤ 46 ug/L | all year |
| Chloroform | daily maximum | ≤ 2081 ug/L | all year |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 7.7 MGD | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Chlorine, total residual | monthly average | ≤ 20 ug/L | all year |
| Chlorine, total residual | daily maximum | ≤ 34 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 | ≤ 10 ug/L | all year |
| Cyanide, free available | daily maximum | ≤ 32 ug/L | all year |
| Enterococci | monthly geometric mean | ≤ 54 CFU/100mL | all year |
| Enterococci | daily maximum | ≤ 175 CFU/100mL | all year |
| Coliform, fecal general | monthly geometric mean | report only (MPN/100mL) | all year |
| Coliform, fecal general | weekly geometric mean | report only (MPN/100mL) | all year |
| Coliform, fecal general | daily maximum | report only (MPN/100mL) | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 15 mg/L | Jun, Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | Jul–Sep |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 15 mg/L | Jun, Oct |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 10 mg/L | Jul–Sep |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 45 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 20 mg/L | Jun, Oct |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 15 mg/L | Jul–Sep |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 1605 lb/d | Jan, Feb, Mar, Apr, May, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 963 lb/d | Jun, Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 642 lb/d | Jul–Sep |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 2890 lb/d | Jan, Feb, Mar, Apr, May, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 1284 lb/d | Jun, Oct |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 963 lb/d | Jul–Sep |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | weekly average | report only (mg/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (lb/d) | all year |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (lb/d) | all year |
| BOD, carb-5 day, 20 deg C, percent removal | minimum | ≥ 85 % | all year |
| Solids, suspended percent removal | minimum | ≥ 85 % | all year |
| LC50 Static 48Hr Acute Pimephales promelas | minimum | ≥ 100 % | all year |
| LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia | minimum | ≥ 100 % | all year |
| NOEL Static Renewal 7Day Chronic Ceriodaphnia dubia | minimum | ≥ 50 % | all year |
Cited limits by parameter: Rhode Island's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/RI0100234 · MCP: https://passage-data.com/mcp