Delta City of

NPDES permit CO0039641 · Major POTW · administratively continued, expires 2023-11-30 · 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 2023-11-30 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

1values over a limit
0required values missing, on 0 form(s)
0of 33 forms filed late

Last period with anything received: 2026-07-31. Most often over: Manganese, dissolved [as Mn] (1).

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among CO permits in EPA's filings — check your permit).

Limits in force (109)

OutfallParameterStatisticLimitMonths
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
002pHMINIMUM >= 6.5 SU all year
002pHMAXIMUM <= 9 SU all year
002Solids, total suspended30DA AVG <= 30 mg/L all year
002Solids, total suspendedMX 7D AV <= 45 mg/L all year
002Nitrogen, ammonia total [as N]30DA AVG <= 47 mg/L Apr
002Nitrogen, ammonia total [as N]30DA AVG <= 65 mg/L Jan
002Nitrogen, ammonia total [as N]30DA AVG <= 65 mg/L Feb
002Nitrogen, ammonia total [as N]30DA AVG <= 45 mg/L Aug
002Nitrogen, ammonia total [as N]30DA AVG <= 50 mg/L May
002Nitrogen, ammonia total [as N]30DA AVG <= 43 mg/L Jul
002Nitrogen, ammonia total [as N]30DA AVG <= 41 mg/L Jun
002Nitrogen, ammonia total [as N]30DA AVG <= 65 mg/L Mar
002Nitrogen, ammonia total [as N]30DA AVG <= 65 mg/L Dec
002Nitrogen, ammonia total [as N]30DA AVG <= 65 mg/L Nov
002Nitrogen, ammonia total [as N]30DA AVG <= 64 mg/L Oct
002Nitrogen, ammonia total [as N]30DA AVG <= 58 mg/L Sep
002Nitrogen, ammonia total [as N]DAILY MX <= 65 mg/L Apr
002Nitrogen, ammonia total [as N]DAILY MX <= 65 mg/L Jan
002Nitrogen, ammonia total [as N]DAILY MX <= 65 mg/L Feb
002Nitrogen, ammonia total [as N]DAILY MX <= 65 mg/L Aug
002Nitrogen, ammonia total [as N]DAILY MX <= 65 mg/L May
002Nitrogen, ammonia total [as N]DAILY MX <= 65 mg/L Jul
002Nitrogen, ammonia total [as N]DAILY MX <= 65 mg/L Jun
002Nitrogen, ammonia total [as N]DAILY MX <= 65 mg/L Mar
002Nitrogen, ammonia total [as N]DAILY MX <= 65 mg/L Dec
002Nitrogen, ammonia total [as N]DAILY MX <= 65 mg/L Nov
002Nitrogen, ammonia total [as N]DAILY MX <= 65 mg/L Oct
002Nitrogen, ammonia total [as N]DAILY MX <= 65 mg/L Sep
002Nitrogen, inorganic totalDAILY MX <= 100 mg/L all year
002Cyanide, weak acid, dissociableDAILY MX report only all year
002Cyanide, total [as CN]DAILY MX report only all year
002Chloride [as Cl]30DA AVG report only all year
002Arsenic, total recoverable30DA AVG report only all year
002Arsenic, total recoverable30DA AVG <= 3.1 ug/L all year
002Arsenic, total recoverableDAILY MX report only all year
002Arsenic, total recoverableDAILY MX report only all year
002Iron, total recoverable30DA AVG report only all year
002Arsenic, total [as As]DAILY MX report only all year
002Cadmium, total [as Cd]DAILY MX report only all year
002Chromium, total [as Cr]DAILY MX report only all year
002Copper, total [as Cu]DAILY MX report only all year
002Iron, dissolved [as Fe]30DA AVG <= 300 ug/L all year
002Lead, total [as Pb]DAILY MX report only all year
002Manganese, dissolved [as Mn]30DA AVG report only all year
002Manganese, dissolved [as Mn]30DA AVG <= 50 ug/L all year
002Molybdenum, total [as Mo]DAILY MX report only all year
002Nickel, total [as Ni]DAILY MX report only all year
002Nickel, total recoverable30DA AVG report only all year
002Nickel, total recoverableDAILY MX report only all year
002Silver, total [as Ag]DAILY MX report only all year
002Silver total recoverable30DA AVG report only all year
002Silver total recoverableDAILY MX report only all year
002Zinc, total [as Zn]DAILY MX report only all year
002Cadmium, total recoverable30DA AVG report only all year
002Cadmium, total recoverableDAILY MX report only all year
002Lead, total recoverable30DA AVG report only all year
002Lead, total recoverableDAILY MX report only all year
002Chromium, total recoverable30DA AVG report only all year
002Chromium, total recoverableDAILY MX report only all year
002Molybdenum, total recoverable30DA AVG report only all year
002Selenium, total [as Se]DAILY MX report only all year
002Zinc, potentially dissolved30DA AVG report only all year
002Zinc, potentially dissolvedDAILY MX report only all year
002Copper, potentially dissolved30DA AVG report only all year
002Copper, potentially dissolvedDAILY MX report only all year
002Arsenic, potentially dissolvedDAILY MX report only all year
002Selenium, potentially dissolvd30DA AVG report only all year
002Selenium, potentially dissolvd30DA AVG report only all year
002Selenium, potentially dissolvdDAILY MX report only all year
002Selenium, potentially dissolvdDAILY MX report only all year
002Selenium, potentially dissolvd30DA AVG report only all year
002Selenium, potentially dissolvd30DA AVG <= .094 lb/d all year
002Selenium, potentially dissolvdDAILY MX report only all year
002Selenium, potentially dissolvdDAILY MX report only all year
002Oil and greaseINST MAX <= 10 mg/L all year
002Total phenolsDAILY MX report only all year
002Flow, in conduit or thru treatment plant30DA AVG <= 2.45 MGD all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002Chlorine, total residual30DA AVG <= .5 mg/L all year
002Chlorine, total residualINST MAX <= .5 mg/L all year
002E. coli30DA GM <= 2000 #/100mL all year
002E. coliMX 7D GM <= 4000 #/100mL all year
002Sulfide-hydrogen sulfide [undissociated]30DA AVG report only all year
002Nonylphenol30DA AVG report only all year
002NonylphenolDAILY MX report only all year
002Solids, total dissolved30DA AVG report only all year
002Solids, total dissolvedDAILY MX report only all year
002Solids, total dissolved30DA AVG report only all year
002Solids, total dissolvedDAILY MX report only all year
002Mercury, total [as Hg]30DA AVG report only all year
002Mercury, total [as Hg]DAILY MX report only all year
002BOD, 5-day, percent removalMO AV MN >= 85 % all year
002Solids, suspended percent removalMO AV MN >= 85 % all year
002Sulfate30DA AVG report only all year
002Oil and grease visualINST MAX report only all year
002LC50 Static Renewal 48Hr Acute Ceriodaphnia dubiaMN VALUE >= 100 % all year
002LC50 Static Renewal 96Hr Acute Pimephales promelasMN VALUE >= 100 % all year
300Plant capacity fact. percent of capacity30DA AVG report only all year
300Plant capacity fact. percent of capacity30DA AVG report only all year
300BOD, 5-day, 20 deg. C30DA AVG report only all year
300BOD, 5-day, 20 deg. CMX 7D AV report only all year
300BOD, 5-day, 20 deg. C30DA AVG report only all year
300BOD, 5-day, 20 deg. CMX 7D AV report only all year
300Solids, total suspended30DA AVG report only all year
300Solids, total suspendedMX 7D AV report only all year
300Flow, in conduit or thru treatment plant30DA AVG report only all year
300Flow, in conduit or thru treatment plantDAILY 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