Public Service Co of Colorado

NPDES permit CO0001112 · Major NON-POTW · administratively continued, expires 2017-10-31 · 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 2017-10-31 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)
0of 78 forms filed late

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

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 (138)

OutfallParameterStatisticLimitMonths
001Conductivity30DA AVG report only all year
001ConductivityDAILY MX report only all year
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 9 SU all year
001Bicarbonate ion- [as HCO3]30DA AVG report only all year
001Bicarbonate ion- [as HCO3]DAILY MX report only 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 <= .1 mg/L Jan
001Nitrogen, ammonia total [as N]30DA AVG <= .1 mg/L Feb
001Nitrogen, ammonia total [as N]30DA AVG <= .1 mg/L Mar
001Nitrogen, ammonia total [as N]30DA AVG <= .1 mg/L Apr
001Nitrogen, ammonia total [as N]30DA AVG <= .1 mg/L May
001Nitrogen, ammonia total [as N]30DA AVG <= .1 mg/L Jun
001Nitrogen, ammonia total [as N]30DA AVG <= .1 mg/L Jul
001Nitrogen, ammonia total [as N]30DA AVG <= .1 mg/L Aug
001Nitrogen, ammonia total [as N]30DA AVG <= .1 mg/L Sep
001Nitrogen, ammonia total [as N]30DA AVG <= .1 mg/L Oct
001Nitrogen, ammonia total [as N]30DA AVG <= .1 mg/L Nov
001Nitrogen, ammonia total [as N]30DA AVG <= .1 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 8.4 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 6.9 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 6.9 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 6.9 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 5.7 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 5.7 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 5.7 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 6.9 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 6.9 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 6.9 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 8.4 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 8.4 mg/L Dec
001Calcium, total recoverable30DA AVG report only all year
001Calcium, total recoverableDAILY MX report only all year
001Magnesium, total recoverable30DA AVG report only all year
001Magnesium, total recoverableDAILY MX report only all year
001Sodium, total recoverable30DA AVG report only all year
001Sodium, total recoverableDAILY MX report only all year
001Sodium adsorption ratio30DA AVG report only all year
001Sodium adsorption ratioDAILY MX report only all year
001Sodium adsorption ratio30DA AVG report only all year
001Sodium adsorption ratioDAILY MX report only all year
001Chloride [as Cl]30DA AVG report only all year
001Arsenic, total recoverable30DA AVG report only all year
001Iron, total recoverable30DA AVG report only all year
001Iron, dissolved [as Fe]30DA AVG report only all year
001Zinc, potentially dissolved30DA AVG report only all year
001Zinc, potentially dissolvedDAILY MX <= 226 ug/L all year
001Copper, potentially dissolved30DA AVG <= 14 ug/L all year
001Copper, potentially dissolvedDAILY MX <= 22 ug/L all year
001Cadmium, potentially dissolvd30DA AVG report only all year
001Cadmium, potentially dissolvdDAILY MX report only all year
001Oil and greaseINST MAX <= 10 mg/L all year
001Flow, in conduit or thru treatment plant30DA AVG report only all year
001Flow, in conduit or thru treatment plant30DA AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only 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
001E. coli30DA AVG report only all year
001Sulfide-hydrogen sulfide [undissociated]30DA AVG report only all year
001Mercury, total [as Hg]30DA AVG report only all year
001Sulfate30DA AVG report only all year
001Boron, total30DA 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 >= 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
002pHMINIMUM >= 6 SU all year
002pHMAXIMUM <= 10 SU all year
002Solids, total suspended30DA AVG <= 30 mg/L all year
002Solids, total suspendedDAILY MX <= 100 mg/L all year
002Oil and grease30DA AVG <= 15 mg/L all year
002Oil and greaseINST MAX <= 20 mg/L all year
002Flow, in conduit or thru treatment plant30DA AVG report only all year
002Flow, in conduit or thru treatment plant30DA AVG report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002Oil and grease visualINST MAX report only all year
003pHMINIMUM >= 6 SU all year
003pHMINIMUM >= 6 SU all year
003pHMAXIMUM <= 11 SU all year
003pHMAXIMUM <= 11 SU all year
003Solids, total suspended30DA AVG <= 30 mg/L all year
003Solids, total suspended30DA AVG <= 30 mg/L all year
003Solids, total suspendedDAILY MX <= 100 mg/L all year
003Solids, total suspendedDAILY MX <= 100 mg/L all year
003Oil and grease30DA AVG <= 15 mg/L all year
003Oil and grease30DA AVG <= 15 mg/L all year
003Oil and greaseINST MAX <= 20 mg/L all year
003Oil and greaseINST MAX <= 20 mg/L all year
003Flow, in conduit or thru treatment plant30DA AVG report only all year
003Flow, in conduit or thru treatment plant30DA AVG report only all year
003Flow, in conduit or thru treatment plant30DA AVG report only all year
003Flow, in conduit or thru treatment plant30DA AVG report only all year
003Flow, in conduit or thru treatment plantDAILY MX report only all year
003Flow, in conduit or thru treatment plantDAILY MX report only all year
003Flow, in conduit or thru treatment plantDAILY MX report only all year
003Flow, in conduit or thru treatment plantDAILY MX report only all year
003Oil and grease visualINST MAX report only all year
003Oil and grease visualINST MAX report only all year
004pHMINIMUM >= 6 SU all year
004pHMAXIMUM <= 9 SU all year
004Solids, total suspended30DA AVG report only all year
004Solids, total suspendedMX 7D AV <= 50 mg/L all year
004Flow, in conduit or thru treatment plant30DA AVG report only all year
004Flow, in conduit or thru treatment plant30DA AVG report only all year
004Flow, in conduit or thru treatment plantDAILY MX report only all year
004Flow, in conduit or thru treatment plantDAILY MX report only all year
005BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L all year
005BOD, 5-day, 20 deg. CMX 7D AV <= 45 mg/L all year
005pHMINIMUM >= 6.5 SU all year
005pHMAXIMUM <= 9 SU all year
005Solids, total suspended30DA AVG <= 105 mg/L all year
005Solids, total suspendedMX 7D AV <= 160 mg/L all year
005Oil and greaseINST MAX <= 10 mg/L all year
005Flow, in conduit or thru treatment plant30DA AVG <= .0015 MGD all year
005Flow, in conduit or thru treatment plantDAILY MX report only all year
005Chlorine, total residual30DA AVG report only all year
005Chlorine, total residualINST MAX <= .5 mg/L all year
005E. coli30DA AVG <= 2000 #/100mL all year
005Oil and grease visualINST MAX report only all year
006BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L all year
006BOD, 5-day, 20 deg. CMX 7D AV <= 45 mg/L all year
006pHMINIMUM >= 6.5 SU all year
006pHMAXIMUM <= 9 SU all year
006Solids, total suspended30DA AVG <= 105 mg/L all year
006Solids, total suspendedMX 7D AV <= 160 mg/L all year
006Oil and greaseINST MAX <= 10 mg/L all year
006Flow, in conduit or thru treatment plant30DA AVG <= .0015 MGD all year
006Flow, in conduit or thru treatment plantDAILY MX report only all year
006Chlorine, total residual30DA AVG report only all year
006Chlorine, total residualINST MAX <= .5 mg/L all year
006E. coli30DA AVG <= 2000 #/100mL all year
006Oil and grease visualINST MAX 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