City of Durham

NPDES permit NC0023841 · Major POTW · effective, expires 2029-01-31 · 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

0values over a limit
143required values missing, on 22 form(s)
11of 44 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 30 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (95)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeDAILY MX report only all year
001Temperature, water deg. centigradeDAILY MX report only Jan, Feb, Mar, Apr, May, Oct, Nov, Dec
001Temperature, water deg. centigradeDAILY MX report only Jun, Jul, Aug, Sep
001ConductivityDAILY MX report only all year
001ConductivityDAILY MX report only Jan, Feb, Mar, Apr, May, Oct, Nov, Dec
001ConductivityDAILY MX report only Jun, Jul, Aug, Sep
001Oxygen, dissolved [DO]DAILY MN >= 7 mg/L all year
001Oxygen, dissolved [DO]DAILY MX report only Jun, Jul, Aug, Sep
001Oxygen, dissolved [DO]DAILY MX report only Jan, Feb, Mar, Apr, May, Oct, Nov, Dec
001BOD, 5-day, 20 deg. C7 DA AVG <= 7.5 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. C7 DA AVG <= 15 mg/L Jan, Feb, Mar, Nov, Dec
001BOD, 5-day, 20 deg. C30DA AVG <= 5 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. C30DA AVG <= 10 mg/L Jan, Feb, Mar, Nov, Dec
001BOD, 5-day, 20 deg. CDAILY MX report only all year
001pHDAILY MN >= 6 SU all year
001pHDAILY MX <= 9 SU all year
001pHDAILY MX report only Jan, Feb, Mar, Apr, May, Oct, Nov, Dec
001pHDAILY MX report only Jun, Jul, Aug, Sep
001Solids, total suspended7 DA AVG <= 45 mg/L all year
001Solids, total suspended30DA AVG <= 30 mg/L all year
001Solids, total suspendedDAILY MX report only all year
001Nitrogen, total [as N]DAILY MX report only all year
001Nitrogen, total [as N]DAILY MX report only all year
001Nitrogen, ammonia total [as N]7 DA AVG <= 3 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]7 DA AVG <= 6 mg/L Jan, Feb, Mar, Nov, Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 1 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 2 mg/L Jan, Feb, Mar, Nov, Dec
001Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
001Nitrite + Nitrate total [as N]DAILY MX report only all year
001Phosphorus, total [as P]9B <= 2 mg/L Jan, Feb, Mar, Nov, Dec
001Cyanide, total [as CN]30DA AVG <= 5 ug/L all year
001Cyanide, total [as CN]DAILY MX <= 22 ug/L all year
001Silver, total [as Ag]30DA AVG <= .06 ug/L all year
001Silver, total [as Ag]DAILY MX <= 1.29 ug/L all year
001Coliform, fecal MF, MFC broth, 44.5 CWK GEOMN <= 400 #/100mL all year
001Coliform, fecal MF, MFC broth, 44.5 CMO GEOMN <= 200 #/100mL all year
001Coliform, fecal MF, MFC broth, 44.5 CDAILY MX report only Jan, Feb, Mar, Apr, May, Oct, Nov, Dec
001Coliform, fecal MF, MFC broth, 44.5 CDAILY MX report only Jun, Jul, Aug, Sep
001Flow, in conduit or thru treatment plant30DA AVG <= 20 MGD all year
001Chlorine, total residualDAILY MX <= 17 ug/L all year
001Flow, totalDAILY MX report only all year
0011,4-DioxaneDAILY MX report only all year
D02Temperature, water deg. centigradeDAILY MX report only Jun, Jul, Aug, Sep
D02Temperature, water deg. centigradeDAILY MX report only Jan, Feb, Mar, Apr, May, Oct, Nov, Dec
D02ConductivityDAILY MX report only Jan, Feb, Mar, Apr, May, Oct, Nov, Dec
D02ConductivityDAILY MX report only Jun, Jul, Aug, Sep
D02Oxygen, dissolved [DO]DAILY MX report only Jan, Feb, Mar, Apr, May, Oct, Nov, Dec
D02Oxygen, dissolved [DO]DAILY MX report only Jun, Jul, Aug, Sep
D02pHDAILY MX report only Jan, Feb, Mar, Apr, May, Oct, Nov, Dec
D02pHDAILY MX report only Jun, Jul, Aug, Sep
D02Nitrogen, total [as N]DAILY MX report only Jun, Jul, Aug, Sep
D02Nitrogen, total [as N]DAILY MX report only all year
D02Nitrogen, ammonia total [as N]DAILY MX report only all year
D02Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
D02Nitrite + Nitrate total [as N]DAILY MX report only all year
D02Phosphate, ortho [as PO4]DAILY MX report only all year
D02Phosphorus, total [as P]DAILY MX report only Jun, Jul, Aug, Sep
D02Phosphorus, total [as P]DAILY MX report only all year
D02Coliform, fecal MF, MFC broth, 44.5 CDAILY MX report only Jan, Feb, Mar, Apr, May, Oct, Nov, Dec
D02Coliform, fecal MF, MFC broth, 44.5 CDAILY MX report only Jun, Jul, Aug, Sep
D02Chlorophyll ADAILY MX report only all year
D03Temperature, water deg. centigradeDAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
D03ConductivityDAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
D03Oxygen, dissolved [DO]DAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
D03pHDAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
D03Nitrogen, total [as N]DAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
D03Nitrogen, total [as N]DAILY MX report only all year
D03Nitrogen, ammonia total [as N]DAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
D03Nitrogen, ammonia total [as N]DAILY MX report only all year
D03Nitrogen, Kjeldahl, total [as N]DAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
D03Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
D03Nitrite + Nitrate total [as N]DAILY MX report only all year
D03Phosphate, ortho [as PO4]DAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
D03Phosphate, ortho [as PO4]DAILY MX report only all year
D03Phosphorus, total [as P]DAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
D03Phosphorus, total [as P]DAILY MX report only all year
D03Chlorophyll ADAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
D03Chlorophyll ADAILY MX report only all year
D04Temperature, water deg. centigradeDAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
D04ConductivityDAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
D04Oxygen, dissolved [DO]DAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
D04pHDAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
D04Nitrogen, total [as N]DAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
D04Nitrogen, total [as N]DAILY MX report only all year
D04Nitrogen, ammonia total [as N]DAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
D04Nitrogen, ammonia total [as N]DAILY MX report only all year
D04Nitrogen, Kjeldahl, total [as N]DAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
D04Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
D04Nitrite + Nitrate total [as N]DAILY MX report only all year
D04Phosphate, ortho [as PO4]DAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
D04Phosphate, ortho [as PO4]DAILY MX report only all year
D04Phosphorus, total [as P]DAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
D04Phosphorus, total [as P]DAILY MX report only all year
D04Chlorophyll ADAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
D04Chlorophyll ADAILY 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