CHARLES RIVER P C D

NPDES permit MA0102598 · Major POTW · expired, expires 2019-10-31 · 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 2019-10-31 and is expired: 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

9values over a limit
0required values missing, on 0 form(s)
0of 16 forms filed late

Last period with anything received: 2026-08-31. Most often over: Copper, total [as Cu] (6), Phosphorus, total [as P] (3).

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 (69)

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 Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedMO AVG <= 7 mg/L May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedWKLY AVG <= 25 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedWKLY AVG <= 10 mg/L May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedDAILY MX report only Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedDAILY MX report only May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedMO AVG <= 570 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedMO AVG <= 265 lb/d May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedWKLY AVG <= 950 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedWKLY AVG <= 380 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 suspendedWKLY AVG <= 950 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedWKLY AVG <= 380 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG report only Jan, Feb, Mar, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 10 mg/L Apr
001Nitrogen, ammonia total [as N]MO AVG <= 5 mg/L May
001Nitrogen, ammonia total [as N]MO AVG <= 1 mg/L Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]WKLY AVG <= 15 mg/L Apr
001Nitrogen, ammonia total [as N]WKLY AVG <= 7.5 mg/L May
001Nitrogen, ammonia total [as N]WKLY AVG <= 1.5 mg/L Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY MX report only Jan, Feb, Mar, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 20 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 10 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 2 mg/L Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG report only Jan, Feb, Mar, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 380 lb/d Apr
001Nitrogen, ammonia total [as N]MO AVG <= 190 lb/d May
001Nitrogen, ammonia total [as N]MO AVG <= 38 lb/d 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 <= 570 lb/d Apr
001Nitrogen, ammonia total [as N]WKLY AVG <= 285 lb/d May
001Nitrogen, ammonia total [as N]WKLY AVG <= 57 lb/d Jun, Jul, Aug, Sep, Oct
001Phosphorus, total [as P]MO AVG <= .3 mg/L Jan, Feb, Mar, Nov, Dec
001Phosphorus, total [as P]MO AVG <= .1 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001Copper, total [as Cu]MO AVG <= 13 ug/L all year
001Copper, total [as Cu]DAILY MX <= 23 ug/L all year
001Flow, in conduit or thru treatment plantMO AVG <= 4.5 MGD Jul, Aug, Sep
001Flow, in conduit or thru treatment plantDAILY MX report only Jul, Aug, Sep
001Flow, in conduit or thru treatment plant1D <= 5.7 MGD all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residualMO AVG <= 17 ug/L Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
001Chlorine, total residualAVERAGE report only Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
001Chlorine, total residualDAILY MX <= 30 ug/L Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
001E. coli, colony forming units [CFU]MO AVG <= 126 CFU/100mL Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
001E. coli, colony forming units [CFU]DAILY MX <= 409 CFU/100mL Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 7 mg/L May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 15 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 <= 25 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]DAILY MX report only May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]DAILY MX report only Jan, Feb, Mar, Apr, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 265 lb/d May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 570 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]DAILY MX report only May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]DAILY MX 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]A1 report only all year
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 380 lb/d May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 950 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001LC50 Static 48Hr Acute Ceriodaphnia dubiaDAILY MN >= 100 % Jan, Apr, Jul, Oct
001LC50 Static 48Hr Acute Pimephales promelasDAILY MN >= 100 % Jan, Apr, Jul, Oct
001NOEL Static Renewal 7Day Chronic Ceriodaphnia dubiaDAILY MN >= 63 % Jan, Apr, Jul, Oct
001Noel Statre 7Day Chronic PimephalesDAILY MN >= 63 % Jan, Apr, Jul, Oct

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