MWRA - DEER ISLAND P O T W

NPDES permit MA0103284 · Major POTW · administratively continued, expires 2005-07-31 · 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 2005-07-31 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

1values over a limit
0required values missing, on 0 form(s)
0of 110 forms filed late

Last period with anything received: 2026-07-31. Most often over: LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia) (1).

Reporting

Reports are due about 15 days after each monitoring period ends (the most common figure among MA permits in EPA's filings — check your permit).

Limits in force (165)

OutfallParameterStatisticLimitMonths
C01BOD, 5-day, 20 deg. CMO AV MN report only all year
C01BOD, 5-day, 20 deg. CMAXIMUM report only all year
C01pHMINIMUM >= 6.5 SU all year
C01pHMAXIMUM <= 8.3 SU all year
C01Solids, total suspendedMO AV MN report only all year
C01Solids, total suspendedMAXIMUM report only all year
C01RainfallMO TOTAL report only all year
C01RainfallMAXIMUM report only all year
C01Flow, in conduit or thru treatment plantMO AVG report only all year
C01Flow, in conduit or thru treatment plantDAILY MX report only all year
C01Chlorine, total residualMO AV MN >= .1 mg/L all year
C01Chlorine, total residualMR <= .25 mg/L all year
C01Coliform, fecal generalMO AV MN report only all year
C01Coliform, fecal generalMAXIMUM report only all year
C01Bypass valveET report only all year
C01Duration of dischargeM6 report only all year
C01Duration of dischargeM6 report only all year
C01LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)DAILY MN report only all year
C01LC50 Static 48Hr Acute MenidiaDAILY MN report only all year
C01LC50 Pass/Fail Static 24Hr Acute Americamysis bahia (formerly Mysidopsis bahia)M5 report only all year
C01LC50 Pass/Fail Static 24Hr Acute Menidia menidiaM5 report only all year
C03BOD, 5-day, 20 deg. CMO AV MN report only all year
C03BOD, 5-day, 20 deg. CMAXIMUM report only all year
C03pHMINIMUM >= 6.5 SU all year
C03pHMAXIMUM <= 8.5 SU all year
C03Solids, total suspendedMO AV MN report only all year
C03Solids, total suspendedMAXIMUM report only all year
C03RainfallMO TOTAL report only all year
C03RainfallMAXIMUM report only all year
C03Flow, in conduit or thru treatment plantMO AVG report only all year
C03Flow, in conduit or thru treatment plantDAILY MX report only all year
C03Chlorine, total residualAVERAGE <= .1 mg/L all year
C03Chlorine, total residualMR <= .25 mg/L all year
C03Coliform, fecal generalMO AV MN report only all year
C03Coliform, fecal generalMAXIMUM report only all year
C03Bypass valveET report only all year
C03Duration of dischargeM6 report only all year
C03Duration of dischargeM6 report only all year
C03LC50 Static 48Hr Acute Ceriodaphnia dubiaDAILY MN report only all year
C03LC50 Static 48Hr Acute D. PulexDAILY MN report only all year
C03LC50 Pass/Fail Static 24Hr Acute CeriodaphniaM5 report only all year
C03LC50 Pass/Fail Static 24Hr Acute Pimephales promelasDAILY MN report only all year
C05BOD, 5-day, 20 deg. CMO AV MN report only all year
C05BOD, 5-day, 20 deg. CMAXIMUM report only all year
C05pHMINIMUM >= 6.5 SU all year
C05pHMAXIMUM <= 8.5 SU all year
C05Solids, total suspendedMO AV MN report only all year
C05Solids, total suspendedMAXIMUM report only all year
C05RainfallMO TOTAL report only all year
C05RainfallMAXIMUM report only all year
C05Flow, in conduit or thru treatment plantMO AVG report only all year
C05Flow, in conduit or thru treatment plantDAILY MX report only all year
C05Chlorine, total residualAVERAGE <= .1 mg/L all year
C05Chlorine, total residualMR <= .25 mg/L all year
C05Coliform, fecal generalMO AV MN report only all year
C05Coliform, fecal generalMAXIMUM report only all year
C05Bypass valveET report only all year
C05Duration of dischargeM6 report only all year
C05Duration of dischargeM6 report only all year
C05LC50 Static 48Hr Acute Ceriodaphnia dubiaDAILY MN report only all year
C05LC50 Static 48Hr Acute D. PulexDAILY MN report only all year
C05LC50 Pass/Fail Static 24Hr Acute CeriodaphniaM5 report only all year
C05LC50 Pass/Fail Static 24Hr Acute Pimephales promelasDAILY MN report only all year
C25BOD, 5-day, 20 deg. CMO AV MN report only all year
C25BOD, 5-day, 20 deg. CMAXIMUM report only all year
C25pHMINIMUM >= 6.5 SU all year
C25pHMAXIMUM <= 8.3 SU all year
C25Solids, total suspendedMO AV MN report only all year
C25Solids, total suspendedMAXIMUM report only all year
C25RainfallMO TOTAL report only all year
C25RainfallMAXIMUM report only all year
C25Flow, in conduit or thru treatment plantMO AVG report only all year
C25Flow, in conduit or thru treatment plantDAILY MX report only all year
C25Chlorine, total residualMO AV MN >= .1 mg/L all year
C25Chlorine, total residualMR <= .25 mg/L all year
C25Coliform, fecal generalMO AV MN report only all year
C25Coliform, fecal generalMAXIMUM report only all year
C25Bypass valveET report only all year
C25Duration of dischargeM6 report only all year
C25Duration of dischargeM6 report only all year
C25LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)DAILY MN report only all year
C25LC50 Static 48Hr Acute MenidiaDAILY MN report only all year
C25LC50 Pass/Fail Static 24Hr Acute Americamysis bahia (formerly Mysidopsis bahia)M5 report only all year
C25LC50 Pass/Fail Static 24Hr Acute Menidia menidiaM5 report only all year
T01pHMINIMUM >= 6 SU all year
T01pHMAXIMUM <= 9 SU all year
T01Solids, total suspendedMO AVG <= 30 mg/L all year
T01Solids, total suspendedWKLY AVG <= 45 mg/L all year
T01Solids, total suspendedDAILY MX report only all year
T01Solids, total suspendedMO AVG report only all year
T01Solids, total suspendedWKLY AVG report only all year
T01Solids, total suspendedDAILY MX report only all year
T01Solids, settleableWKLY AVG report only all year
T01Solids, settleableDAILY MX report only all year
T01Nitrogen, ammonia total [as N]MO AVG report only all year
T01Nitrogen, nitrite total [as N]MO AVG report only all year
T01Nitrogen, nitrate total [as N]MO AVG report only all year
T01Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
T01Chloride [as Cl]DAILY MX report only all year
T01Arsenic, total [as As]MO AVG report only all year
T01Arsenic, total [as As]DAILY MX report only all year
T01Copper, total recoverableMO AVG report only all year
T01Copper, total recoverableDAILY MX report only all year
T01Coliform, fecal - % samples exceeding limitMAXIMUM <= 10 % all year
T01PCB-1016MO AVG <= .000045 ug/L all year
T01PCB-1016DAILY MX report only all year
T014,4'-DDTMO AVG report only all year
T014,4'-DDTDAILY MX report only all year
T01AldrinMO AVG report only all year
T01AldrinDAILY MX report only all year
T01Chlordane, .alpha.-, whole waterMO AVG report only all year
T01Chlordane, .alpha.-, whole waterDAILY MX report only all year
T01Chlordane [tech mix. and metabolites]MO AVG report only all year
T01Chlordane [tech mix. and metabolites]DAILY MX report only all year
T01DieldrinMO AVG report only all year
T01DieldrinDAILY MX report only all year
T01HeptachlorMO AVG report only all year
T01HeptachlorDAILY MX report only all year
T01Heptachlor epoxideMO AVG report only all year
T01Heptachlor epoxideDAILY MX report only all year
T01PCB-1221MO AVG <= .000045 ug/L all year
T01PCB-1221DAILY MX report only all year
T01PCB-1232MO AVG <= .000045 ug/L all year
T01PCB-1232DAILY MX report only all year
T01PCB-1242MO AVG <= .000045 ug/L all year
T01PCB-1242DAILY MX report only all year
T01PCB-1248MO AVG <= .000045 ug/L all year
T01PCB-1248DAILY MX report only all year
T01PCB-1254MO AVG <= .000045 ug/L all year
T01PCB-1254DAILY MX report only all year
T01PCB-1260MO AVG <= .000045 ug/L all year
T01PCB-1260DAILY MX report only all year
T01Polychlorinated biphenyls [PCBs]MO AVG report only all year
T01Polychlorinated biphenyls [PCBs]DAILY MX report only all year
T01HexachlorobenzeneMO AVG report only all year
T01HexachlorobenzeneDAILY MX report only all year
T01.gamma.-Chlordane, whole waterMO AVG report only all year
T01.gamma.-Chlordane, whole waterDAILY MX report only all year
T01Flow, in conduit or thru treatment plantMO AVG report only all year
T01Flow, in conduit or thru treatment plantDAILY MX report only all year
T01Chlorine, total residualMO AVG <= 456 ug/L all year
T01Chlorine, total residualDAILY MX <= 631 ug/L all year
T01Mercury, total [as Hg]MO AVG report only all year
T01Mercury, total [as Hg]DAILY MX report only all year
T01Coliform, fecal generalWB <= 14000 #/100mL all year
T01Coliform, fecal generalDAILY MX <= 14000 #/100mL all year
T01Coliform, fecal generalMO GEO <= 200 #/100mL all year
T01Coliform, fecal generalMD <= 200 #/100mL all year
T01Coliform, fecal generalDAILY MX <= 400 #/100mL all year
T01Cyanide, total recoverableMO AVG report only all year
T01Cyanide, total recoverableDAILY MX report only all year
T01Volatile fraction organics [EPA 624]MO AVG report only all year
T01Volatile fraction organics [EPA 624]DAILY MX report only all year
T01CBOD5+NH3-NMO AVG <= 25 mg/L all year
T01CBOD5+NH3-NWKLY AVG <= 40 mg/L all year
T01CBOD5+NH3-NDAILY MX report only all year
T01CBOD5+NH3-NMO AVG report only all year
T01CBOD5+NH3-NWKLY AVG report only all year
T01CBOD5+NH3-NDAILY MX report only all year
T01Flow, totalANNL AVG <= 436 MGD all year
T01Flow, totalMO AVG report only all year
T01LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)DAILY MN >= 50 % all year
T01LC50 Static 48Hr Acute MenidiaDAILY MN >= 50 % all year
T01NOEL Static 1Hr 20min Fert. Chronic Arbacia punctulataDAILY MN >= 1.5 % all year
T01Noael Statre 7Day Chronic MenidiaDAILY MN >= 1.5 % 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