Public Service Co of Colorado

NPDES permit CO0000612 · Major NON-POTW · administratively continued, expires 2023-07-31 · 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 2023-07-31 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

6values over a limit
0required values missing, on 0 form(s)
0of 92 forms filed late

Last period with anything received: 2026-07-31. Most often over: Oil and grease (2), Static Renewal 7 Day Chronic Pimephales promelas (2), BOD, 5-day, 20 deg. C (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 (165)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeMX WK AV <= 30 deg C all year
001Temperature, water deg. centigradeMX WK AV <= 30 deg C Jan
001Temperature, water deg. centigradeMX WK AV <= 30 deg C Feb
001Temperature, water deg. centigradeMX WK AV <= 28.9 deg C Mar
001Temperature, water deg. centigradeMX WK AV <= 27.9 deg C Apr
001Temperature, water deg. centigradeMX WK AV <= 27.8 deg C May
001Temperature, water deg. centigradeMX WK AV <= 30 deg C Jun
001Temperature, water deg. centigradeMX WK AV <= 30 deg C Jul
001Temperature, water deg. centigradeMX WK AV <= 30 deg C Aug
001Temperature, water deg. centigradeMX WK AV <= 30 deg C Sep
001Temperature, water deg. centigradeMX WK AV <= 27.5 deg C Oct
001Temperature, water deg. centigradeMX WK AV <= 28.4 deg C Nov
001Temperature, water deg. centigradeMX WK AV <= 30 deg C Dec
001Temperature, water deg. centigradeDAILY MX report only all year
001Temperature, water deg. centigradeDAILY MX <= 17 deg C Jan
001Temperature, water deg. centigradeDAILY MX <= 18 deg C Feb
001Temperature, water deg. centigradeDAILY MX <= 29.3 deg C Mar
001Temperature, water deg. centigradeDAILY MX <= 28.7 deg C Apr
001Temperature, water deg. centigradeDAILY MX <= 28.6 deg C May
001Temperature, water deg. centigradeDAILY MX <= 31 deg C Jun
001Temperature, water deg. centigradeDAILY MX <= 30 deg C Jul
001Temperature, water deg. centigradeDAILY MX <= 31 deg C Aug
001Temperature, water deg. centigradeDAILY MX <= 29 deg C Sep
001Temperature, water deg. centigradeDAILY MX <= 28.6 deg C Oct
001Temperature, water deg. centigradeDAILY MX <= 29.4 deg C Nov
001Temperature, water deg. centigradeDAILY MX <= 19 deg C Dec
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspended30DA AVG <= 26 mg/L all year
001Solids, total suspendedDAILY MX <= 84 mg/L all year
001Nitrogen, ammonia total [as N]30DA AVG <= 2.3 mg/L Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 2.7 mg/L Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 2.8 mg/L Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 2.1 mg/L Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 1.6 mg/L May
001Nitrogen, ammonia total [as N]30DA AVG <= 1 mg/L Jun
001Nitrogen, ammonia total [as N]30DA AVG <= .9 mg/L Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 1 mg/L Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 1.1 mg/L Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 1.3 mg/L Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 2.2 mg/L Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 2.3 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 6.5 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 8.2 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 10 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 8.6 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 9 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 7.6 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 7.4 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 8 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 7.8 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 7 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 9.7 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 6.8 mg/L Dec
001Nitrogen, inorganic totalDAILY MX report only all year
001Cyanide, weak acid, dissociableDAILY MX report only all year
001Cyanide, weak acid, dissociableDAILY MX <= 5 ug/L all year
001Chloride [as Cl]30DA AVG report only all year
001Arsenic, total recoverable30DA AVG report only all year
001Arsenic, total recoverable30DA AVG <= 10 ug/L all year
001Iron, total recoverable30DA AVG report only all year
001Iron, dissolved [as Fe]30DA AVG report only all year
001Manganese, dissolved [as Mn]30DA AVG report only all year
001Zinc, total [as Zn]30DA AVG <= 440 ug/L all year
001Zinc, total [as Zn]30DA AVG <= 440 ug/L all year
001Zinc, total [as Zn]DAILY MX <= 440 ug/L all year
001Zinc, total [as Zn]DAILY MX <= 440 ug/L all year
001Aluminum, total recoverable30DA AVG report only all year
001Aluminum, total recoverable30DA AVG report only all year
001Aluminum, total recoverable30DA AVG <= 1438 ug/L all year
001Aluminum, total recoverableDAILY MX report only all year
001Aluminum, total recoverableDAILY MX <= 10071 ug/L all year
001Aluminum, total recoverableDAILY MX <= 10071 ug/L all year
001Chromium, total recoverable30DA AVG <= 90 ug/L all year
001Chromium, total recoverable30DA AVG <= 90 ug/L all year
001Chromium, total recoverableDAILY MX <= 90 ug/L all year
001Chromium, total recoverableDAILY MX <= 90 ug/L all year
001Molybdenum, total recoverable30DA AVG report only all year
001Molybdenum, total recoverable30DA AVG <= 160 ug/L all year
001Chromium, hexavalent dissolved [as Cr]30DA AVG report only all year
001Chromium, hexavalent dissolved [as Cr]30DA AVG <= 11 ug/L all year
001Chromium, hexavalent dissolved [as Cr]DAILY MX <= 16 ug/L all year
001Chromium, hexavalent dissolved [as Cr]DAILY MX report only all year
001Zinc, potentially dissolved30DA AVG <= 428 ug/L all year
001Zinc, potentially dissolvedDAILY MX <= 564 ug/L all year
001Silver, potentially dissolved30DA AVG report only all year
001Silver, potentially dissolvedDAILY MX report only all year
001Copper, potentially dissolved30DA AVG report only all year
001Copper, potentially dissolvedDAILY MX report only all year
001Cadmium, potentially dissolvd30DA AVG report only all year
001Cadmium, potentially dissolvdDAILY MX report only all year
001Lead, potentially dissolvd30DA AVG report only all year
001Lead, potentially dissolvdDAILY MX report only all year
001Manganese, potentially dissolvd30DA AVG report only all year
001Manganese, potentially dissolvdDAILY MX report only all year
001Nickel, potentially dissolvd30DA AVG report only all year
001Nickel, potentially dissolvdDAILY MX report only all year
001Selenium, potentially dissolvd30DA AVG report only all year
001Selenium, potentially dissolvdDAILY MX report only all year
001Oil and grease30DA AVG <= 13 mg/L all year
001Oil and greaseINST MAX <= 17 mg/L all year
001Chromium, trivalent total recoverableDAILY MX report only all year
001Chromium, trivalent total recoverableDAILY MX <= 50 ug/L all year
001Flow, in conduit or thru treatment plant30DA AVG <= 5.17 MGD all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residual30DA AVG <= .011 mg/L all year
001Chlorine, total residualINST MAX <= .019 mg/L all year
001Sulfide-hydrogen sulfide [undissociated]30DA AVG <= .002 mg/L all year
001Mercury, total [as Hg]30DA AVG <= .01 ug/L all year
001Sulfate30DA AVG report only all year
001Sulfate30DA AVG <= 1410 mg/L all year
001Hydrazine30DA AVG report only all year
001Hydrazine30DA AVG <= .012 ug/L all year
001Boron, total30DA AVG report only all year
001Boron, total30DA AVG <= .75 mg/L 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 >= 100 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 >= 100 tox chronic 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
002BOD, 5-day, 20 deg. C30DA AVG report only all year
002BOD, 5-day, 20 deg. CMX 7D AV report only all year
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 report only Mar
002Nitrogen, ammonia total [as N]30DA AVG report only Apr
002Nitrogen, ammonia total [as N]30DA AVG report only May
002Nitrogen, ammonia total [as N]30DA AVG report only Jun
002Nitrogen, ammonia total [as N]30DA AVG report only Jul
002Nitrogen, ammonia total [as N]30DA AVG report only Aug
002Nitrogen, ammonia total [as N]30DA AVG report only Sep
002Nitrogen, ammonia total [as N]30DA AVG report only Oct
002Nitrogen, ammonia total [as N]30DA AVG report only Nov
002Nitrogen, ammonia total [as N]30DA AVG <= 65 mg/L Dec
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 Mar
002Nitrogen, ammonia total [as N]DAILY MX report only Apr
002Nitrogen, ammonia total [as N]DAILY MX report only May
002Nitrogen, ammonia total [as N]DAILY MX report only Jun
002Nitrogen, ammonia total [as N]DAILY MX report only Jul
002Nitrogen, ammonia total [as N]DAILY MX report only Aug
002Nitrogen, ammonia total [as N]DAILY MX report only Sep
002Nitrogen, ammonia total [as N]DAILY MX report only Oct
002Nitrogen, ammonia total [as N]DAILY MX <= 65 mg/L Nov
002Nitrogen, ammonia total [as N]DAILY MX <= 65 mg/L Dec
002Flow, in conduit or thru treatment plant30DA AVG <= .016 MGD all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002Chlorine, total residualINST MAX <= .5 mg/L all year
002E. coli30DA GM <= 126 #/100mL all year
002E. coliMX 7D GM <= 252 #/100mL all year
010Priority pollutants scan [yes/no]30DA AVG report only all year
300Flow, in conduit or thru treatment plant30DA AVG report only all year
300Flow, in conduit or thru treatment plantDAILY MX <= 204.9 MGD all year
303Flow, in conduit or thru treatment plant30DA AVG report only all year
303Flow, in conduit or thru treatment plantDAILY MX report only all year
304Flow, in conduit or thru treatment plant30DA AVG report only all year
304Flow, in conduit or thru treatment plantDAILY MX report only all year
306Flow, in conduit or thru treatment plant30DA AVG report only all year
306Flow, in conduit or thru treatment plantDAILY MX report only all year
307Flow, in conduit or thru treatment plant30DA AVG report only all year
307Flow, 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