Windsor Town of

NPDES permit CO0020320 · Major POTW · administratively continued, expires 2020-05-31 · 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 2020-05-31 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

0values over a limit
0required values missing, on 0 form(s)
2of 31 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 (85)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeMX WK AV report only all year
001Temperature, water deg. centigradeDAILY MX report only all year
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspended30DA AVG <= 30 mg/L all year
001Solids, total suspendedMX 7D AV <= 45 mg/L all year
001Nitrogen, ammonia total [as N]30DA AVG <= 4.5 mg/L Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 8.4 mg/L Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 12.4 mg/L Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 9.8 mg/L Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 6 mg/L Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 9.4 mg/L Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 8.7 mg/L Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 11 mg/L Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 9.5 mg/L Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 13.5 mg/L May
001Nitrogen, ammonia total [as N]30DA AVG <= 9.2 mg/L Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 8.8 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 55 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 60 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 50 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 15.8 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 60 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 22.8 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 17.3 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 26.4 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 20.4 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 40 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 17.1 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 26.2 mg/L Apr
001Nitrogen, inorganic totalAgg Rol Av report only all year
001Nitrogen, inorganic totalAgg Rol Av <= 15 mg/L all year
001Nitrogen, inorganic total95th % report only all year
001Nitrogen, inorganic total95th % <= 20 mg/L all year
001Phosphorus, total [as P]Agg Rol Av report only all year
001Phosphorus, total [as P]Agg Rol Av <= 1 mg/L all year
001Phosphorus, total [as P]95th % report only all year
001Phosphorus, total [as P]95th % <= 2.5 mg/L all year
001Cyanide, weak acid, dissociableDAILY MX <= 11 ug/L all year
001Cyanide, weak acid, dissociableROLL AVG <= 2.5 ug/L all year
001Cyanide, total [as CN]DAILY MX report only all year
001Arsenic, total [as As]DAILY MX report only all year
001Cadmium, total [as Cd]DAILY MX report only all year
001Chromium, total [as Cr]DAILY MX report only all year
001Copper, total [as Cu]DAILY MX report only all year
001Lead, total [as Pb]DAILY MX report only all year
001Molybdenum, total [as Mo]DAILY MX report only all year
001Nickel, total [as Ni]DAILY MX report only all year
001Silver, total [as Ag]DAILY MX report only all year
001Zinc, total [as Zn]DAILY MX report only all year
001Selenium, total [as Se]DAILY MX report only all year
001Chromium, hexavalent dissolved [as Cr]30DA AVG report only all year
001Copper, potentially dissolved30DA AVG <= 18 ug/L all year
001Copper, potentially dissolvedDAILY MX report only all year
001Oil and greaseINST MAX <= 10 mg/L all year
001Total phenolsDAILY MX report only all year
001Flow, in conduit or thru treatment plant30DA AVG <= 2.8 MGD all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residual30DA AVG <= .036 mg/L all year
001Chlorine, total residualINST MAX <= .043 mg/L all year
001E. coli30DA GM <= 126 #/100mL all year
001E. coliMX 7D GM <= 252 #/100mL all year
001Mercury, total [as Hg]30DA AVG <= .02 ug/L all year
001Mercury, total [as Hg]DAILY MX report only all year
001BOD, carbonaceous [5 day, 20 C]30DA AVG <= 25 mg/L all year
001BOD, carbonaceous [5 day, 20 C]MX 7D AV <= 40 mg/L all year
001BOD, carb-5 day, 20 deg C, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001Boron, total30DA AVG report only all year
001Boron, totalROLL AVG report only all year
001Oil and grease visualINST MAX report only all year
001Static Renewal 7 Day Chronic Ceriodaphnia dubiaSINGSAMP report only all year
001Static Renewal 7 Day Chronic Ceriodaphnia dubiaMN VALUE report only all year
001Static Renewal 7 Day Chronic Ceriodaphnia dubiaMN VALUE >= 19 tox chronic all year
001Static Renewal 7 Day Chronic Pimephales promelasSINGSAMP report only all year
001Static Renewal 7 Day Chronic Pimephales promelasMN VALUE report only all year
001Static Renewal 7 Day Chronic Pimephales promelasMN VALUE >= 19 tox chronic all year
300Plant capacity fact. percent of capacity30DA AVG report only all year
300Plant capacity fact. percent of capacity30DA AVG 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
300BOD, carbonaceous [5 day, 20 C]30DA AVG report only all year
300BOD, carbonaceous [5 day, 20 C]MX 7D AV 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