NARRAGANSETT BAY COMMISSION

NPDES permit RI0100072 · Major POTW · administratively continued, expires 2022-11-30 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

This permit expired on 2022-11-30 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

EPA's record, 2025-09-01 to 2026-08-31

3values over a limit
0required values missing, on 0 form(s)
0of 37 forms filed late

Last period with anything received: 2026-07-31. Most often over: Nickel, total [as Ni] (2), Solids, suspended percent removal (1).

Reporting

Reports are due about 15 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (141)

OutfallParameterStatisticLimitMonths
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedMO AVG <= 20 mg/L May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedMO AVG <= 20 mg/L May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedWKLY AVG <= 45 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedWKLY AVG <= 20 mg/L May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedWKLY AVG <= 20 mg/L May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedDAILY MX <= 50 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedDAILY MX <= 30 mg/L May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedDAILY MX <= 45 mg/L May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedMO AVG <= 7756 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedMO AVG <= 5171 lb/d May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedMO AVG <= 5171 lb/d May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedDAILY MX <= 12927 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedDAILY MX <= 7756 lb/d May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedDAILY MX <= 11634 lb/d May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedWKLY AVG report only all year
001Solids, total suspendedDAILY MX report only all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedDAILY MX report only all year
001Solids, settleableWKLY AVG report only all year
001Solids, settleableDAILY MX report only all year
001Oil & GreaseMO AVG report only all year
001Oil & GreaseDAILY MX report only all year
001Nitrogen, total [as N]MO AVG <= 5 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, total [as N]MO AVG report only Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, total [as N]DAILY MX report only May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, total [as N]DAILY MX report only Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, total [as N]MO AVG <= 1293 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, total [as N]MO AVG report only Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]DAILY MX report only all year
001Nitrogen, nitrite total [as N]MO AVG report only all year
001Nitrogen, nitrite total [as N]DAILY MX report only all year
001Nitrogen, nitrate total [as N]MO AVG report only all year
001Nitrogen, nitrate total [as N]DAILY MX report only all year
001Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
001Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]DAILY MX report only all year
001Cadmium, total [as Cd]MO AVG report only all year
001Cadmium, total [as Cd]DAILY MX report only all year
001Cadmium, total [as Cd]MO AVG report only all year
001Cadmium, total [as Cd]DAILY MX report only all year
001Chromium, hexavalent [as Cr]MO AVG report only all year
001Chromium, hexavalent [as Cr]DAILY MX report only all year
001Chromium, hexavalent [as Cr]MO AVG report only all year
001Chromium, hexavalent [as Cr]DAILY MX report only all year
001Copper, total [as Cu]MO AVG <= 6.5 ug/L all year
001Copper, total [as Cu]MO AVG <= 29.8 ug/L all year
001Copper, total [as Cu]DAILY MX <= 6.5 ug/L all year
001Copper, total [as Cu]DAILY MX <= 86.1 ug/L all year
001Copper, total [as Cu]MO AVG report only all year
001Copper, total [as Cu]DAILY MX report only all year
001Lead, total [as Pb]MO AVG report only all year
001Lead, total [as Pb]DAILY MX report only all year
001Lead, total [as Pb]MO AVG report only all year
001Lead, total [as Pb]DAILY MX report only all year
001Nickel, total [as Ni]MO AVG <= 14.3 ug/L all year
001Nickel, total [as Ni]MO AVG <= 25 ug/L all year
001Nickel, total [as Ni]DAILY MX <= 70.3 ug/L all year
001Nickel, total [as Ni]DAILY MX <= 70.3 ug/L all year
001Nickel, total [as Ni]MO AVG report only all year
001Nickel, total [as Ni]DAILY MX report only all year
001Zinc, total [as Zn]MO AVG <= 85.6 ug/L all year
001Zinc, total [as Zn]DAILY MX <= 85.6 ug/L all year
001Zinc, total [as Zn]MO AVG report only all year
001Zinc, total [as Zn]DAILY MX report only all year
001Aluminum, total [as Al]MO AVG report only all year
001Aluminum, total [as Al]DAILY MX report only all year
001Aluminum, total [as Al]MO AVG report only all year
001Aluminum, total [as Al]DAILY MX report only all year
001Ultraviolet light intensityMO MIN report only all year
001Ultraviolet light intensityMO AVG report only all year
001Ultraviolet light intensityMO MAX report only all year
001Flow, in conduit or thru treatment plantMO AVG <= 31 MGD all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Ultraviolet light transmittanceMO MIN report only all year
001Ultraviolet light transmittanceMO AVG report only all year
001Ultraviolet light transmittanceMO MAX report only all year
001Cyanide, free availableMO AVG <= 10 ug/L all year
001Cyanide, free availableDAILY MX <= 10 ug/L all year
001Cyanide, free availableMO AVG report only all year
001Cyanide, free availableDAILY MX report only all year
001EnterococciMO GEO <= 35 MPN/100mL all year
001EnterococciDA GEO <= 276 MPN/100mL all year
001Ultraviolet light dosageMO MIN report only all year
001Ultraviolet light dosageMO AVG report only all year
001Ultraviolet light dosageMO MAX report only all year
001Coliform, fecal generalMO GEO report only all year
001Coliform, fecal generalWB report only all year
001Coliform, fecal generalDA GEO report only all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 10 mg/L May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 20 mg/L May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 40 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 10 mg/L May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 20 mg/L May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 45 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 15 mg/L May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 30 mg/L May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 6464 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 2585 lb/d May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 5171 lb/d May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 11634 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 3878 lb/d May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 7756 lb/d May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
001BOD, carbonaceous [5 day, 20 C]WKLY AVG report only all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX report only all year
001BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX report only all year
001BOD, carb-5 day, 20 deg C, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001LC50 Static Renewal 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)MINIMUM >= 100 % all year
001NOEL Static 1Hr 20min Fert. Chronic Arbacia punctulataMINIMUM >= 50 % all year
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
003Solids, total suspendedMO AVG report only all year
003Solids, total suspendedDAILY MX report only all year
003Flow, in conduit or thru treatment plantMO AVG report only all year
003Flow, in conduit or thru treatment plantDAILY MX <= 70 MGD all year
003Chlorine, total residualMO AVG report only all year
003Chlorine, total residualMO AVG report only all year
003Chlorine, total residualWKLY AVG report only all year
003Chlorine, total residualDAILY MX <= 20 ug/L all year
003Chlorine, total residualDAILY MX report only all year
003EnterococciMO GEO report only all year
003EnterococciMO GEO report only all year
003EnterococciDA GEO <= 276 MPN/100mL all year
003EnterococciDA GEO report only all year
003Coliform, fecal generalMO GEO report only all year
003Coliform, fecal generalDA GEO report only all year
003BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
003BOD, carbonaceous [5 day, 20 C]DAILY MX report only all year
003BOD, carb-5 day, 20 deg C, percent removalMO AV MN >= 35 % all year
003Solids, suspended percent removalMO AV MN >= 50 % all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states