Columbia, City of

NPDES permit SD0022926 · Minor POTW · effective, expires 2028-10-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file

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

0values over a limit
32required values missing, on 2 form(s)
6of 22 forms filed late

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

Reporting

Reports are due about 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (80)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigrade30DA AVG report only all year
001Temperature, water deg. centigradeDAILY MX report only all year
001Flow rate30DA AVG report only all year
001Flow rateDAILY MX report only all year
001BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CMX 7D AV <= 45 mg/L all year
001pHDAILY MN >= 6.5 SU all year
001pHDAILY MX <= 9 SU all year
001Solids, total suspended30DA AVG <= 30 mg/L all year
001Solids, total suspendedMX 7D AV <= 45 mg/L all year
001Nitrogen, total [as N]DAILY MX report only all year
001Nitrogen, ammonia total [as N]30DA AVG <= 4.8 mg/L Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 5.5 mg/L Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 2.2 mg/L Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 2.3 mg/L Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 1.8 mg/L Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 1 mg/L Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 4.8 mg/L May
001Nitrogen, ammonia total [as N]30DA AVG <= 1.1 mg/L Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 3 mg/L Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 1 mg/L Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 1 mg/L Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 1 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX report only Feb
001Nitrogen, ammonia total [as N]DAILY MX report only Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 14 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 10.9 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 9.3 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 4.4 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX report only May
001Nitrogen, ammonia total [as N]DAILY MX <= 6.6 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 14.4 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 1.2 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 3.2 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 2.2 mg/L Aug
001Phosphorus, total [as P]DAILY MX report only all year
001E. coli, colony forming units [CFU]30DA GEO <= 630 #/100mL May, Jun, Jul, Aug, Sep
001E. coli, colony forming units [CFU]DAILY MX <= 1178 #/100mL May, Jun, Jul, Aug, Sep
001Flow, totalMO TOTAL report only all year
001Duration of dischargeMO TOTAL report only all year
002Temperature, water deg. centigrade30DA AVG report only all year
002Temperature, water deg. centigradeDAILY MX report only all year
002Flow rate30DA AVG report only all year
002Flow rateDAILY MX report only all year
002BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L all year
002BOD, 5-day, 20 deg. CMX 7D AV <= 45 mg/L all year
002pHDAILY MN >= 6.5 SU all year
002pHDAILY MX <= 9 SU all year
002Solids, total suspended30DA AVG <= 30 mg/L all year
002Solids, total suspendedMX 7D AV <= 45 mg/L all year
002Nitrogen, total [as N]DAILY MX report only all year
002Nitrogen, ammonia total [as N]30DA AVG <= 1 mg/L Aug
002Nitrogen, ammonia total [as N]30DA AVG <= 1 mg/L Jul
002Nitrogen, ammonia total [as N]30DA AVG <= 3 mg/L Dec
002Nitrogen, ammonia total [as N]30DA AVG <= 1.8 mg/L Apr
002Nitrogen, ammonia total [as N]30DA AVG <= 1 mg/L Sep
002Nitrogen, ammonia total [as N]30DA AVG <= 2.2 mg/L Mar
002Nitrogen, ammonia total [as N]30DA AVG <= 1 mg/L Jun
002Nitrogen, ammonia total [as N]30DA AVG <= 2.3 mg/L Nov
002Nitrogen, ammonia total [as N]30DA AVG <= 4.8 mg/L May
002Nitrogen, ammonia total [as N]30DA AVG <= 5.5 mg/L Jan
002Nitrogen, ammonia total [as N]30DA AVG <= 1.1 mg/L Oct
002Nitrogen, ammonia total [as N]30DA AVG <= 4.8 mg/L Feb
002Nitrogen, ammonia total [as N]DAILY MX <= 2.2 mg/L Aug
002Nitrogen, ammonia total [as N]DAILY MX <= 1.2 mg/L Jul
002Nitrogen, ammonia total [as N]DAILY MX <= 14.4 mg/L Dec
002Nitrogen, ammonia total [as N]DAILY MX <= 9.3 mg/L Apr
002Nitrogen, ammonia total [as N]DAILY MX <= 3.2 mg/L Sep
002Nitrogen, ammonia total [as N]DAILY MX <= 14 mg/L Mar
002Nitrogen, ammonia total [as N]DAILY MX <= 4.4 mg/L Jun
002Nitrogen, ammonia total [as N]DAILY MX <= 10.9 mg/L Nov
002Nitrogen, ammonia total [as N]DAILY MX report only May
002Nitrogen, ammonia total [as N]DAILY MX report only Jan
002Nitrogen, ammonia total [as N]DAILY MX <= 6.6 mg/L Oct
002Nitrogen, ammonia total [as N]DAILY MX report only Feb
002Phosphorus, total [as P]DAILY MX report only all year
002E. coli, colony forming units [CFU]30DA GEO <= 630 #/100mL May, Jun, Jul, Aug, Sep
002E. coli, colony forming units [CFU]DAILY MX <= 1178 #/100mL May, Jun, Jul, Aug, Sep
002Flow, totalMO TOTAL report only all year
002Duration of dischargeMO TOTAL 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