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Sewage treatment plant, major discharger, Westerly, Rhode Island. NPDES permit RI0100064 expired Sep 30, 2026; its limits still apply. Last 12 months: over a limit 3 times (last March 2026), 1 of 20 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Copper, total [as Cu], daily maximum | 26 ug/L | ≤ 23 ug/L | 13% |
| March 2026 | Cyanide, Available, daily maximum | 142 ug/L | ≤ 10 ug/L | 1320% |
| March 2026 | Cyanide, Available, monthly average | 78 ug/L | ≤ 10 ug/L | 680% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| pH | minimum | ≥ 6.5 SU | all year |
| pH | maximum | ≤ 8.5 SU | all year |
| Solids, total suspended | monthly average | ≤ 20 mg/L | May–Oct |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | weekly average | ≤ 20 mg/L | May–Oct |
| Solids, total suspended | weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | May–Oct |
| Solids, total suspended | daily maximum | ≤ 50 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 550 lb/d | May–Oct |
| Solids, total suspended | monthly average | ≤ 826 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | daily maximum | ≤ 826 lb/d | May–Oct |
| Solids, total suspended | daily maximum | ≤ 1376 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| 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 | 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 |
| Oil & Grease | daily maximum | report only (mg/L) | all year |
| Nitrogen, total [as N] | monthly average | ≤ 5 mg/L | May–Oct |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, total [as N] | monthly average | ≤ 15 mg/L | May–Oct |
| Nitrogen, total [as N] | daily maximum | 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 | ≤ 138 lb/d | May–Oct |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, total [as N] | monthly average | ≤ 413 lb/d | May–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.7 mg/L | May–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 30.9 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5.5 mg/L | May–Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.7 mg/L | May–Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 101.9 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.4 mg/L | May–Oct |
| 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) | May–Oct |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | May–Oct |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Arsenic, total [as As] | monthly average | ≤ 11 ug/L | all year |
| Arsenic, total [as As] | daily maximum | ≤ 276 ug/L | all year |
| 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 | ≤ 23 ug/L | all year |
| Copper, total [as Cu] | daily maximum | ≤ 23 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 |
| Lead, total [as Pb] | monthly average | report only (ug/L) | all year |
| Lead, total [as Pb] | daily maximum | report only (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 | report only (ug/L) | all year |
| Aluminum, total [as Al] | daily maximum | report only (ug/L) | all year |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 3.3 MGD | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Chlorine, total residual | monthly average | ≤ 65 ug/L | all year |
| Chlorine, total residual | daily maximum | ≤ 65 ug/L | all year |
| Enterococci | monthly geometric mean | ≤ 35 CFU/100mL | all year |
| Enterococci | daily maximum | ≤ 276 CFU/100mL | all year |
| Coliform, fecal general | monthly geometric mean | ≤ 88 MPN/100mL | all year |
| Coliform, fecal general | daily maximum | report only (MPN/100mL) | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 20 mg/L | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 20 mg/L | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 30 mg/L | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 550 lb/d | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 688 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 826 lb/d | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 1238 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] | 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 |
| Cyanide, Available | monthly average | ≤ 10 ug/L | all year |
| Cyanide, Available | daily maximum | ≤ 10 ug/L | all year |
| Cyanide, Available | monthly average | report only (ug/L) | all year |
| Cyanide, Available | daily maximum | report only (ug/L) | all year |
| LC50 Static Renewal 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia) | minimum | ≥ 100 % | all year |
| NOEL Static 1Hr 20min Fert. Chronic Arbacia punctulata | minimum | ≥ 10 % | 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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