Public Service Co of Colorado — NPDES permit CO0000612: limits, due date and EPA's record

Electric Services, major discharger, Pueblo, Colorado. NPDES permit CO0000612 expired Jul 31, 2023; its limits still apply. Last 12 months: over a limit 5 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period ending	Outfall	Parameter	Reported	Limit	Over by
October 2025	001	Oil and grease, instantaneous maximum	19 mg/L	≤ 17 mg/L	12%
December 2025	001	Aluminum, total recoverable, 30-day average	1973 ug/L	≤ 1438 ug/L	37%
March 2026	001	Static Renewal 7 Day Chronic Pimephales promelas, minimum value	< 20 tox chronic	≥ 100 tox chronic	—
March 2026	002	BOD, 5-day, 20 deg. C, 30-day average	42 mg/L	≤ 30 mg/L	40%
June 2026	001	Static Renewal 7 Day Chronic Pimephales promelas, minimum value	60 tox chronic	≥ 100 tox chronic	40%

Limits in force (165)

Parameter	Statistic	Limit	Months	Outfall
Temperature, water deg. centigrade	maximum weekly average	≤ 30 deg C	all year	001
Temperature, water deg. centigrade	maximum weekly average	≤ 30 deg C	Jan	001
Temperature, water deg. centigrade	maximum weekly average	≤ 30 deg C	Feb	001
Temperature, water deg. centigrade	maximum weekly average	≤ 28.9 deg C	Mar	001
Temperature, water deg. centigrade	maximum weekly average	≤ 27.9 deg C	Apr	001
Temperature, water deg. centigrade	maximum weekly average	≤ 27.8 deg C	May	001
Temperature, water deg. centigrade	maximum weekly average	≤ 30 deg C	Jun	001
Temperature, water deg. centigrade	maximum weekly average	≤ 30 deg C	Jul	001
Temperature, water deg. centigrade	maximum weekly average	≤ 30 deg C	Aug	001
Temperature, water deg. centigrade	maximum weekly average	≤ 30 deg C	Sep	001
Temperature, water deg. centigrade	maximum weekly average	≤ 27.5 deg C	Oct	001
Temperature, water deg. centigrade	maximum weekly average	≤ 28.4 deg C	Nov	001
Temperature, water deg. centigrade	maximum weekly average	≤ 30 deg C	Dec	001
Temperature, water deg. centigrade	daily maximum	report only (deg C)	all year	001
Temperature, water deg. centigrade	daily maximum	≤ 17 deg C	Jan	001
Temperature, water deg. centigrade	daily maximum	≤ 18 deg C	Feb	001
Temperature, water deg. centigrade	daily maximum	≤ 29.3 deg C	Mar	001
Temperature, water deg. centigrade	daily maximum	≤ 28.7 deg C	Apr	001
Temperature, water deg. centigrade	daily maximum	≤ 28.6 deg C	May	001
Temperature, water deg. centigrade	daily maximum	≤ 31 deg C	Jun	001
Temperature, water deg. centigrade	daily maximum	≤ 30 deg C	Jul	001
Temperature, water deg. centigrade	daily maximum	≤ 31 deg C	Aug	001
Temperature, water deg. centigrade	daily maximum	≤ 29 deg C	Sep	001
Temperature, water deg. centigrade	daily maximum	≤ 28.6 deg C	Oct	001
Temperature, water deg. centigrade	daily maximum	≤ 29.4 deg C	Nov	001
Temperature, water deg. centigrade	daily maximum	≤ 19 deg C	Dec	001
pH	minimum	≥ 6.5 SU	all year	001
pH	maximum	≤ 9 SU	all year	001
Solids, total suspended	30-day average	≤ 26 mg/L	all year	001
Solids, total suspended	daily maximum	≤ 84 mg/L	all year	001
Nitrogen, ammonia total [as N]	30-day average	≤ 2.3 mg/L	Jan	001
Nitrogen, ammonia total [as N]	30-day average	≤ 2.7 mg/L	Feb	001
Nitrogen, ammonia total [as N]	30-day average	≤ 2.8 mg/L	Mar	001
Nitrogen, ammonia total [as N]	30-day average	≤ 2.1 mg/L	Apr	001
Nitrogen, ammonia total [as N]	30-day average	≤ 1.6 mg/L	May	001
Nitrogen, ammonia total [as N]	30-day average	≤ 1 mg/L	Jun	001
Nitrogen, ammonia total [as N]	30-day average	≤ .9 mg/L	Jul	001
Nitrogen, ammonia total [as N]	30-day average	≤ 1 mg/L	Aug	001
Nitrogen, ammonia total [as N]	30-day average	≤ 1.1 mg/L	Sep	001
Nitrogen, ammonia total [as N]	30-day average	≤ 1.3 mg/L	Oct	001
Nitrogen, ammonia total [as N]	30-day average	≤ 2.2 mg/L	Nov	001
Nitrogen, ammonia total [as N]	30-day average	≤ 2.3 mg/L	Dec	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 6.5 mg/L	Jan	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 8.2 mg/L	Feb	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 10 mg/L	Mar	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 8.6 mg/L	Apr	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 9 mg/L	May	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7.6 mg/L	Jun	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7.4 mg/L	Jul	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 8 mg/L	Aug	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7.8 mg/L	Sep	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7 mg/L	Oct	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 9.7 mg/L	Nov	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 6.8 mg/L	Dec	001
Nitrogen, inorganic total	daily maximum	report only (mg/L)	all year	001
Cyanide, weak acid, dissociable	daily maximum	report only (ug/L)	all year	001
Cyanide, weak acid, dissociable	daily maximum	≤ 5 ug/L	all year	001
Chloride [as Cl]	30-day average	report only (mg/L)	all year	001
Arsenic, total recoverable	30-day average	report only (ug/L)	all year	001
Arsenic, total recoverable	30-day average	≤ 10 ug/L	all year	001
Iron, total recoverable	30-day average	report only (ug/L)	all year	001
Iron, dissolved [as Fe]	30-day average	report only (ug/L)	all year	001
Manganese, dissolved [as Mn]	30-day average	report only (ug/L)	all year	001
Zinc, total [as Zn]	30-day average	≤ 440 ug/L	all year	001
Zinc, total [as Zn]	30-day average	≤ 440 ug/L	all year	001
Zinc, total [as Zn]	daily maximum	≤ 440 ug/L	all year	001
Zinc, total [as Zn]	daily maximum	≤ 440 ug/L	all year	001
Aluminum, total recoverable	30-day average	report only (ug/L)	all year	001
Aluminum, total recoverable	30-day average	report only (ug/L)	all year	001
Aluminum, total recoverable	30-day average	≤ 1438 ug/L	all year	001
Aluminum, total recoverable	daily maximum	report only (ug/L)	all year	001
Aluminum, total recoverable	daily maximum	≤ 10071 ug/L	all year	001
Aluminum, total recoverable	daily maximum	≤ 10071 ug/L	all year	001
Chromium, total recoverable	30-day average	≤ 90 ug/L	all year	001
Chromium, total recoverable	30-day average	≤ 90 ug/L	all year	001
Chromium, total recoverable	daily maximum	≤ 90 ug/L	all year	001
Chromium, total recoverable	daily maximum	≤ 90 ug/L	all year	001
Molybdenum, total recoverable	30-day average	report only (ug/L)	all year	001
Molybdenum, total recoverable	30-day average	≤ 160 ug/L	all year	001
Chromium, hexavalent dissolved [as Cr]	30-day average	report only (ug/L)	all year	001
Chromium, hexavalent dissolved [as Cr]	30-day average	≤ 11 ug/L	all year	001
Chromium, hexavalent dissolved [as Cr]	daily maximum	≤ 16 ug/L	all year	001
Chromium, hexavalent dissolved [as Cr]	daily maximum	report only (ug/L)	all year	001
Zinc, potentially dissolved	30-day average	≤ 428 ug/L	all year	001
Zinc, potentially dissolved	daily maximum	≤ 564 ug/L	all year	001
Silver, potentially dissolved	30-day average	report only (ug/L)	all year	001
Silver, potentially dissolved	daily maximum	report only (ug/L)	all year	001
Copper, potentially dissolved	30-day average	report only (ug/L)	all year	001
Copper, potentially dissolved	daily maximum	report only (ug/L)	all year	001
Cadmium, potentially dissolvd	30-day average	report only (ug/L)	all year	001
Cadmium, potentially dissolvd	daily maximum	report only (ug/L)	all year	001
Lead, potentially dissolvd	30-day average	report only (ug/L)	all year	001
Lead, potentially dissolvd	daily maximum	report only (ug/L)	all year	001
Manganese, potentially dissolvd	30-day average	report only (ug/L)	all year	001
Manganese, potentially dissolvd	daily maximum	report only (ug/L)	all year	001
Nickel, potentially dissolvd	30-day average	report only (ug/L)	all year	001
Nickel, potentially dissolvd	daily maximum	report only (ug/L)	all year	001
Selenium, potentially dissolvd	30-day average	report only (ug/L)	all year	001
Selenium, potentially dissolvd	daily maximum	report only (ug/L)	all year	001
Oil and grease	30-day average	≤ 13 mg/L	all year	001
Oil and grease	instantaneous maximum	≤ 17 mg/L	all year	001
Chromium, trivalent total recoverable	daily maximum	report only (ug/L)	all year	001
Chromium, trivalent total recoverable	daily maximum	≤ 50 ug/L	all year	001
Flow, in conduit or thru treatment plant	30-day average	≤ 5.17 MGD	all year	001
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	001
Chlorine, total residual	30-day average	≤ .011 mg/L	all year	001
Chlorine, total residual	instantaneous maximum	≤ .019 mg/L	all year	001
Sulfide-hydrogen sulfide [undissociated]	30-day average	≤ .002 mg/L	all year	001
Mercury, total [as Hg]	30-day average	≤ .01 ug/L	all year	001
Sulfate	30-day average	report only (mg/L)	all year	001
Sulfate	30-day average	≤ 1410 mg/L	all year	001
Hydrazine	30-day average	report only (ug/L)	all year	001
Hydrazine	30-day average	≤ .012 ug/L	all year	001
Boron, total	30-day average	report only (mg/L)	all year	001
Boron, total	30-day average	≤ .75 mg/L	all year	001
Static Renewal 7 Day Chronic Ceriodaphnia dubia	single sample	report only (tox chronic)	all year	001
Static Renewal 7 Day Chronic Ceriodaphnia dubia	minimum value	report only (tox chronic)	all year	001
Static Renewal 7 Day Chronic Ceriodaphnia dubia	minimum value	≥ 100 tox chronic	all year	001
Static Renewal 7 Day Chronic Pimephales promelas	single sample	report only (tox chronic)	all year	001
Static Renewal 7 Day Chronic Pimephales promelas	minimum value	report only (tox chronic)	all year	001
Static Renewal 7 Day Chronic Pimephales promelas	minimum value	≥ 100 tox chronic	all year	001
BOD, 5-day, 20 deg. C	30-day average	≤ 30 mg/L	all year	002
BOD, 5-day, 20 deg. C	maximum 7-day average	≤ 45 mg/L	all year	002
BOD, 5-day, 20 deg. C	30-day average	report only (mg/L)	all year	002
BOD, 5-day, 20 deg. C	maximum 7-day average	report only (mg/L)	all year	002
Nitrogen, ammonia total [as N]	30-day average	≤ 65 mg/L	Jan	002
Nitrogen, ammonia total [as N]	30-day average	≤ 65 mg/L	Feb	002
Nitrogen, ammonia total [as N]	30-day average	report only (mg/L)	Mar	002
Nitrogen, ammonia total [as N]	30-day average	report only (mg/L)	Apr	002
Nitrogen, ammonia total [as N]	30-day average	report only (mg/L)	May	002
Nitrogen, ammonia total [as N]	30-day average	report only (mg/L)	Jun	002
Nitrogen, ammonia total [as N]	30-day average	report only (mg/L)	Jul	002
Nitrogen, ammonia total [as N]	30-day average	report only (mg/L)	Aug	002
Nitrogen, ammonia total [as N]	30-day average	report only (mg/L)	Sep	002
Nitrogen, ammonia total [as N]	30-day average	report only (mg/L)	Oct	002
Nitrogen, ammonia total [as N]	30-day average	report only (mg/L)	Nov	002
Nitrogen, ammonia total [as N]	30-day average	≤ 65 mg/L	Dec	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 65 mg/L	Jan	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 65 mg/L	Feb	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 65 mg/L	Mar	002
Nitrogen, ammonia total [as N]	daily maximum	report only (mg/L)	Apr	002
Nitrogen, ammonia total [as N]	daily maximum	report only (mg/L)	May	002
Nitrogen, ammonia total [as N]	daily maximum	report only (mg/L)	Jun	002
Nitrogen, ammonia total [as N]	daily maximum	report only (mg/L)	Jul	002
Nitrogen, ammonia total [as N]	daily maximum	report only (mg/L)	Aug	002
Nitrogen, ammonia total [as N]	daily maximum	report only (mg/L)	Sep	002
Nitrogen, ammonia total [as N]	daily maximum	report only (mg/L)	Oct	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 65 mg/L	Nov	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 65 mg/L	Dec	002
Flow, in conduit or thru treatment plant	30-day average	≤ .016 MGD	all year	002
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	002
Chlorine, total residual	instantaneous maximum	≤ .5 mg/L	all year	002
E. coli	30-day geometric mean	≤ 126 #/100mL	all year	002
E. coli	maximum 7-day geometric mean	≤ 252 #/100mL	all year	002
Priority pollutants scan [yes/no]	30-day average	report only (Y=0;N=1)	all year	010
Flow, in conduit or thru treatment plant	30-day average	report only (MGD)	all year	300
Flow, in conduit or thru treatment plant	daily maximum	≤ 204.9 MGD	all year	300
Flow, in conduit or thru treatment plant	30-day average	report only (MGD)	all year	303
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	303
Flow, in conduit or thru treatment plant	30-day average	report only (MGD)	all year	304
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	304
Flow, in conduit or thru treatment plant	30-day average	report only (MGD)	all year	306
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	306
Flow, in conduit or thru treatment plant	30-day average	report only (MGD)	all year	307
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	307

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/CO0000612 · MCP: https://passage-data.com/mcp