UPPER BLACKSTONE W P A D

NPDES permit MA0102369 · Major POTW · administratively continued, expires 2013-09-30 · 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 2013-09-30 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

7values over a limit
0required values missing, on 0 form(s)
1of 26 forms filed late

Last period with anything received: 2026-07-31. Most often over: Phosphorus, total [as P] (4), Cadmium, total [as Cd] (2), Nitrogen, total [as N] (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 (137)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]DAILY MN >= 6 mg/L all year
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 8.3 SU all year
001Solids, total suspendedMO AVG <= 15 mg/L Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedMO AVG <= 20 mg/L May
001Solids, total suspendedMO AVG <= 30 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedWKLY AVG <= 15 mg/L Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedWKLY AVG <= 30 mg/L May
001Solids, total suspendedWKLY AVG <= 45 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedDAILY MX <= 22 mg/L Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedDAILY MX <= 33 mg/L May
001Solids, total suspendedDAILY MX <= 50 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedMO AVG <= 7006 lb/d Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedMO AVG <= 14011 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedMO AVG <= 9341 lb/d May
001Solids, total suspendedWKLY AVG report only Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedWKLY AVG report only Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedWKLY AVG report only May
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 suspendedWKLY AVG 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]MO AVG <= 6 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, total [as N]WKLY 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]DAILY MX report only May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, total [as N]MO AVG report only May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, total [as N]MO AVG report only Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, total [as N]MO AVG report only May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, total [as N]WKLY AVG report only May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, total [as N]WKLY AVG report only Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, total [as N]WKLY AVG report only May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 12 mg/L Jan, Feb, Mar, Apr, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 10 mg/L Nov
001Nitrogen, ammonia total [as N]MO AVG <= 5 mg/L May
001Nitrogen, ammonia total [as N]MO AVG <= 2 mg/L Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]WKLY AVG <= 24 mg/L Jan, Feb, Mar, Apr, Dec
001Nitrogen, ammonia total [as N]WKLY AVG <= 20 mg/L Nov
001Nitrogen, ammonia total [as N]WKLY AVG <= 10 mg/L May
001Nitrogen, ammonia total [as N]WKLY AVG <= 4 mg/L Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY MX report only Jan, Feb, Mar, Apr, Dec
001Nitrogen, ammonia total [as N]DAILY MX report only Nov
001Nitrogen, ammonia total [as N]DAILY MX report only May
001Nitrogen, ammonia total [as N]DAILY MX report only Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 934 lb/d Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 5600 lb/d Jan, Feb, Mar, Apr, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 2330 lb/d May
001Nitrogen, ammonia total [as N]MO AVG <= 4670 lb/d Nov
001Nitrogen, ammonia total [as N]WKLY AVG report only Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]WKLY AVG report only Jan, Feb, Mar, Apr, Dec
001Nitrogen, ammonia total [as N]WKLY AVG report only May
001Nitrogen, ammonia total [as N]WKLY AVG report only Nov
001Nitrogen, ammonia total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]WKLY AVG report only all year
001Phosphorus, total [as P]MO AVG <= 1 mg/L Jan, Feb, Mar, Nov, Dec
001Phosphorus, total [as P]ROLL AVG <= .1 mg/L 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 report only Apr
001Phosphorus, total [as P]WKLY AVG report only Apr, May, Jun, Jul, Aug, Sep, Oct
001Phosphorus, total [as P]WKLY AVG report only Jan, Feb, Mar, Nov, Dec
001Phosphorus, total [as P]WKLY AVG report only Apr
001Phosphorus, total [as P]WKLY AVG report only Jan, Feb, Mar, Nov, Dec
001Phosphorus, total [as P]DAILY MX report only Jan, Feb, Mar, Nov, Dec
001Phosphorus, total [as P]DAILY MX report only Apr, 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]MO AVG 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 report only Jan, Feb, Mar, Nov, Dec
001Phosphorus, total [as P]MO AVG report only Apr
001Phosphorus, total [as P]WKLY AVG report only Apr, May, Jun, Jul, Aug, Sep, Oct
001Phosphorus, total [as P]WKLY AVG report only Jan, Feb, Mar, Nov, Dec
001Phosphorus, total [as P]WKLY AVG report only Jan, Feb, Mar, Nov, Dec
001Phosphorus, total [as P]WKLY AVG report only Apr
001Phosphorus, total [as P]MO AVG report only Apr, May, Jun, Jul, Aug, Sep, Oct
001Phosphorus, total [as P]WKLY AVG report only Apr, May, Jun, Jul, Aug, Sep, Oct
001Phosphate, ortho, dissolved [as P]MO AVG report only Jan, Feb, Mar, Nov, Dec
001Phosphate, ortho, dissolved [as P]WKLY AVG report only Jan, Feb, Mar, Nov, Dec
001Phosphate, ortho, dissolved [as P]DAILY MX report only Jan, Feb, Mar, Nov, Dec
001Phosphate, ortho, dissolved [as P]MO AVG report only Jan, Feb, Mar, Nov, Dec
001Phosphate, ortho, dissolved [as P]WKLY AVG report only Jan, Feb, Mar, Nov, Dec
001Cadmium, total [as Cd]MO AVG <= .5 ug/L all year
001Cadmium, total [as Cd]DAILY MX <= 1.5 ug/L all year
001Copper, total [as Cu]MO AVG <= 7.2 ug/L all year
001Copper, total [as Cu]DAILY MX <= 10.2 ug/L all year
001Lead, total [as Pb]MO AVG report only all year
001Nickel, total [as Ni]MO AVG report only all year
001Zinc, total [as Zn]MO AVG <= 91.3 ug/L all year
001Zinc, total [as Zn]DAILY MX <= 91.3 ug/L all year
001Aluminum, total [as Al]MO AVG <= 87 ug/L all year
001Aluminum, total [as Al]DAILY MX report only all year
001Flow, in conduit or thru treatment plant1D <= 56 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 <= 20 ug/L all year
001Chlorine, total residualDAILY MX <= 21 ug/L all year
001Chlorine, total residualMO AVG report only all year
001Chlorine, total residualDAILY MX report only all year
001Coliform, fecal generalMO GEO <= 200 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001Coliform, fecal generalMO GEO <= 571 CFU/100mL Jan, Feb, Mar, Nov, Dec
001Coliform, fecal generalMO GEO <= 200 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001Coliform, fecal generalDAILY MX <= 400 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001Coliform, fecal generalDAILY MX <= 1429 CFU/100mL Jan, Feb, Mar, Nov, Dec
001Coliform, fecal generalDAILY MX <= 400 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 10 mg/L Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 20 mg/L May
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 15 mg/L Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 30 mg/L May
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 40 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 17 mg/L Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 33 mg/L May
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 45 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 4670 lb/d Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 9341 lb/d May
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 11676 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]WKLY AVG report only May
001BOD, carbonaceous [5 day, 20 C]WKLY AVG report only Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]WKLY AVG report only Jan, Feb, Mar, Apr, Nov, Dec
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]WKLY AVG report only all year
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % Jan, Feb, Mar, Apr, May, Nov, Dec
001Solids, suspended percent removalMO AV MN >= 85 % Jun, Jul, Aug, Sep, Oct
001LC50 Static 48Hr Acute Ceriodaphnia dubiaDAILY MN >= 100 % all year
001LC50 Static 48Hr Acute Pimephales promelasDAILY MN >= 100 % all year
001NOEL Static Renewal 7Day Chronic Ceriodaphnia dubiaDAILY MN >= 90 % all year
001Noel Statre 7Day Chronic PimephalesDAILY MN >= 90 % all year
001TLC50 Static 48Hr Acute Ceriodaphnia dubiaDAILY MN report only all year
001TLC50 Static 48Hr Acute Pimephales promelasDAILY MN report only all year

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