MARLBOROUGH WESTERLY W W T P

NPDES permit MA0100480 · Major POTW · effective, expires 2026-12-31 · 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.

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

1values over a limit
0required values missing, on 0 form(s)
0of 39 forms filed late

Last period with anything received: 2026-08-31. Most often over: E. coli (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 (114)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeDAILY MX report only all year
001Oxygen, dissolved [DO]MINIMUM >= 5 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 8 SU all year
001pHMAXIMUM report only all year
001Solids, total suspendedMO AVG <= 15 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedMO AVG <= 30 mg/L Jan, Feb, Mar, Nov, Dec
001Solids, total suspendedWKLY AVG <= 15 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedWKLY AVG <= 45 mg/L Jan, Feb, Mar, Nov, Dec
001Solids, total suspendedMO AVG <= 362 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedMO AVG <= 723 lb/d Jan, Feb, Mar, Nov, Dec
001Solids, total suspendedWKLY AVG <= 362 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedWKLY AVG <= 1085 lb/d Jan, Feb, Mar, Nov, Dec
001Solids, total suspendedMO AVG report only all year
001Nitrogen, total [as N]MO AVG report only Jan, Feb, Mar, Nov, Dec
001Nitrogen, total [as N]MO AVG report only Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, total [as N]DAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
001Ammonia nitrogen, total, [as N] 30 dayDAILY MX report only all year
001Nitrogen, ammonia total [as N]MO AVG <= 2 mg/L Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 10 mg/L Jan, Feb, Mar, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 8 mg/L Apr
001Nitrogen, ammonia total [as N]MO AVG <= 4 mg/L May
001Nitrogen, ammonia total [as N]WKLY AVG <= 2 mg/L Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]WKLY AVG report only Jan, Feb, Mar, Nov, Dec
001Nitrogen, ammonia total [as N]WKLY AVG report only Apr
001Nitrogen, ammonia total [as N]WKLY AVG report only May
001Nitrogen, ammonia total [as N]DAILY MX <= 3 mg/L Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY MX report only all year
001Nitrogen, ammonia total [as N]MO AVG report only Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG report only Apr
001Nitrogen, ammonia total [as N]MO AVG report only May
001Nitrogen, ammonia total [as N]WKLY AVG report only Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG report only Jan, Feb, Mar, Nov, Dec
001Nitrogen, Kjeldahl, total [as N]MO AVG report only Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, Kjeldahl, total [as N]MO AVG report only Jan, Feb, Mar, Nov, Dec
001Nitrogen, Kjeldahl, total [as N]DAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrite + Nitrate total [as N]MO AVG report only Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrite + Nitrate total [as N]MO AVG report only Jan, Feb, Mar, Nov, Dec
001Nitrite + Nitrate total [as N]DAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
001Phosphorus, total [as P]MO AVG report only Jan, Feb, Mar, Nov, Dec
001Phosphorus, total [as P]MO AVG <= .1 mg/L Apr
001Phosphorus, total [as P]ROLL AVG <= .1 mg/L May, Jun, Jul, Aug, Sep, Oct
001Phosphorus, total [as P]DAILY MX report only Jan, Feb, Mar, Nov, Dec
001Phosphorus, total [as P]DAILY MX <= .2 mg/L Apr
001Phosphorus, total [as P]DAILY MX report only May, Jun, Jul, Aug, Sep, Oct
001Phosphorus, total [as P]MO AVG <= 4.8 lb/d Jan, Feb, Mar, Nov, Dec
001Phosphorus, total [as P]MO AVG report only Apr
001Phosphorus, total [as P]MO AVG report only May, Jun, Jul, Aug, Sep, Oct
001Phosphorus, total [as P]DAILY MX report only Jan, Feb, Mar, Nov, Dec
001Phosphorus, total [as P]DAILY MX report only Apr
001Phosphorus, total [as P]DAILY MX report only May, Jun, Jul, Aug, Sep, Oct
001Phosphorus, total [as P]DAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
001Carbon, tot organic [TOC]DAILY MX report only all year
001Carbon, tot organic [TOC]DAILY MX report only all year
001Carbon, dissolved organic [as C]DAILY MX report only all year
001Hardness, total [as CaCO3]DAILY MX report only all year
001Hardness, total [as CaCO3]DAILY MX report only all year
001Cadmium, total [as Cd]DAILY MX report only all year
001Cadmium, total [as Cd]DAILY MX report only all year
001Copper, total [as Cu]MO AVG <= .017 mg/L all year
001Copper, total [as Cu]DAILY MX <= .018 mg/L all year
001Copper, total [as Cu]DAILY MX report only all year
001Copper, total [as Cu]DAILY MX report only all year
001Lead, total [as Pb]DAILY MX report only all year
001Lead, total [as Pb]DAILY MX report only all year
001Nickel, total [as Ni]DAILY MX report only all year
001Nickel, total [as Ni]DAILY MX report only all year
001Zinc, total [as Zn]DAILY MX report only all year
001Zinc, total [as Zn]DAILY MX report only all year
001Aluminum, total [as Al]DAILY MX report only all year
001Aluminum, total [as Al]DAILY MX report only all year
001Flow, in conduit or thru treatment plantROLL AVG <= 2.89 MGD 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
001Chlorine, total residualMO AVG <= .028 mg/L all year
001Chlorine, total residualDAILY MX <= .048 mg/L all year
001E. coliMO GEO <= 126 CFU/100mL all year
001E. coliDAILY MX <= 409 CFU/100mL all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L Jan, Feb, Mar, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 13 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 40 mg/L Jan, Feb, Mar, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 13 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]DAILY MX report only Jan, Feb, Mar, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 25 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 603 lb/d Jan, Feb, Mar, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 313 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 603 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 964 lb/d Jan, Feb, Mar, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 313 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
001BOD, carbonaceous, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001LC50 Static 48Hr Acute Ceriodaphnia dubiaMO AV MN >= 100 % all year
001LC50 Static 48Hr Acute Pimephales promelasMO AV MN >= 100 % all year
001NOEL Static 7Day Chronic Ceriodaphnia dubiaMO AV MN >= 40 % all year
001Noel Statre 7Day Chronic PimephalesMO AV MN >= 40 % all year
PFASPerfluorooctanoic acid (PFOA)DAILY MX report only all year
PFASPerfluorooctanoic acid (PFOA)DAILY MX report only all year
PFASPerfluorooctanoic acid (PFOA)DAILY MX report only all year
PFASPerfluoroheptanoic acid (PFHpA)DAILY MX report only all year
PFASPerfluoroheptanoic acid (PFHpA)DAILY MX report only all year
PFASPerfluoroheptanoic acid (PFHpA)DAILY MX report only all year
PFASPerfluorononanoic acid (PFNA)DAILY MX report only all year
PFASPerfluorononanoic acid (PFNA)DAILY MX report only all year
PFASPerfluorononanoic acid (PFNA)DAILY MX report only all year
PFASPerfluorodecanoic acid (PFDA)DAILY MX report only all year
PFASPerfluorodecanoic acid (PFDA)DAILY MX report only all year
PFASPerfluorodecanoic acid (PFDA)DAILY MX report only all year
PFASPerfluorohexanesulfonic acid (PFHxS)DAILY MX report only all year
PFASPerfluorohexanesulfonic acid (PFHxS)DAILY MX report only all year
PFASPerfluorohexanesulfonic acid (PFHxS)DAILY MX report only all year
PFASPerfluorooctanesulfonic acid (PFOS)DAILY MX report only all year
PFASPerfluorooctanesulfonic acid (PFOS)DAILY MX report only all year
PFASPerfluorooctanesulfonic acid (PFOS)DAILY MX report only 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