DERBY WPCF, CITY OF

NPDES permit CT0100161 · Major POTW · expired, expires 2024-08-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file

This permit expired on 2024-08-31 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

2values over a limit
0required values missing, on 0 form(s)
3of 11 forms filed late

Last period with anything received: 2026-07-31. Most often over: Chlorine, total residual (1), Solids, total suspended (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 (58)

OutfallParameterStatisticLimitMonths
001Flow rateDAILY AV report only all year
001Flow rateDAILY MX report only all year
001BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CDAILY MX <= 50 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG report only all year
001BOD, 5-day, 20 deg. CDAILY MX report only Jan, Apr, Jul, Oct
001pHINST MIN >= 6 SU all year
001pHINST MAX <= 9 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedDAILY MX <= 50 mg/L all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedDAILY MX report only Jan, Apr, Jul, Oct
001Nitrogen, ammonia total [as N]DAILY MX report only Jan, Apr, Jul, Oct
001Nitrogen, nitrite total [as N]DAILY MX report only Jan, Apr, Jul, Oct
001Nitrogen, nitrate total [as N]DAILY MX report only Jan, Apr, Jul, Oct
001Phosphorus, total [as P]DAILY MX report only all year
001Phosphorus, total [as P]DAILY MX report only Jan, Apr, Jul, Oct
001Cyanide, total [as CN]DAILY MX report only Jan, Apr, Jul, Oct
001Cyanide, free [amenable to chlorination]DAILY MX report only Jan, Apr, Jul, Oct
001Arsenic, total [as As]DAILY MX report only Jan, Apr, Jul, Oct
001Beryllium, total [as Be]DAILY MX report only Jan, Apr, Jul, Oct
001Cadmium, total [as Cd]DAILY MX report only Jan, Apr, Jul, Oct
001Chromium, hexavalent [as Cr]DAILY MX report only Jan, Apr, Jul, Oct
001Chromium, total [as Cr]DAILY MX report only Jan, Apr, Jul, Oct
001Copper, total [as Cu]DAILY MX report only Jan, Apr, Jul, Oct
001Iron, total [as Fe]DAILY MX report only Jan, Apr, Jul, Oct
001Lead, total [as Pb]DAILY MX report only Jan, Apr, Jul, Oct
001Thallium, total [as Tl]DAILY MX report only Jan, Apr, Jul, Oct
001Nickel, total [as Ni]DAILY MX report only Jan, Apr, Jul, Oct
001Silver, total [as Ag]DAILY MX report only Jan, Apr, Jul, Oct
001Zinc, total [as Zn]DAILY MX report only Jan, Apr, Jul, Oct
001Antimony, total [as Sb]DAILY MX report only Jan, Apr, Jul, Oct
001Aluminum, total [as Al]DAILY MX report only Jan, Apr, Jul, Oct
001Selenium, total [as Se]DAILY MX report only Jan, Apr, Jul, Oct
001Polychlorinated biphenyls [PCBs]INST MAX report only Jan, Apr, Jul, Oct
001PhenolsDAILY MX report only Jan, Apr, Jul, Oct
001Chlorine, total residualAVERAGE <= .3 mg/L May, Jun, Jul, Aug, Sep
001Chlorine, total residualINST MAX <= .6 mg/L May, Jun, Jul, Aug, Sep
001Chlorine, total residualDAILY MX report only Jan, Apr, Jul, Oct
001Enterococci30DA GEO <= 35 #/100L May, Jun, Jul, Aug, Sep
001EnterococciINST MAX <= 500 #/100L May, Jun, Jul, Aug, Sep
001Arsenic, sludge tot. dry wt [as As]INST MAX report only Jan, Apr, Jul, Oct
001Beryllium, sludge, tot. dry wt [as Be]INST MAX report only Jan, Apr, Jul, Oct
001Solids, total, percentMINIMUM report only Jan, Apr, Jul, Oct
001Solids, fixed, % of total solidsMINIMUM report only Jan, Apr, Jul, Oct
001Solids, volatile % of total solidsMINIMUM report only Jan, Apr, Jul, Oct
001Mercury, total [as Hg]DAILY MX report only Jan, Apr, Jul, Oct
001Zinc, sludge, total, dry weight [as Zn]INST MAX report only Jan, Apr, Jul, Oct
001Lead, sludge, total, dry weight [as Pb]INST MAX report only Jan, Apr, Jul, Oct
001Nickel, sludge, total, dry weight [as Ni]INST MAX report only Jan, Apr, Jul, Oct
001Mercury, sludge, total, dry weight [as Hg]INST MAX report only Jan, Apr, Jul, Oct
001Chromium, sludge, total, dry weight [as Cr]INST MAX report only Jan, Apr, Jul, Oct
001Copper, sludge, total, dry weight [as Cu]INST MAX report only Jan, Apr, Jul, Oct
001Cadmium, sludge, total, dry weight [as Cd]INST MAX report only Jan, Apr, Jul, Oct
001BOD, 5-day, percent removalMN % RMV >= 85 % all year
001Solids, suspended percent removalMN % RMV >= 85 % all year
001NOAEL Static 48Hr Acute D. pulexMINIMUM report only Jan, Apr, Jul, Oct
001NOAEL Static 48Hr Acute Pimephales promelasMINIMUM report only 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