Sterling City of — NPDES permit CO0026247: limits, due date and EPA's record

Sewage treatment plant, major discharger, Sterling, Colorado. NPDES permit CO0026247 expired Feb 28, 2017; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Limits in force (224)

Parameter	Statistic	Limit	Months	Outfall
Temperature, water deg. centigrade	maximum weekly average	report only (deg C)	all year	001
Temperature, water deg. centigrade	daily maximum	report only (deg C)	all year	001
BOD, 5-day, 20 deg. C	30-day average	≤ 30 mg/L	all year	001
BOD, 5-day, 20 deg. C	30-day average	≤ 30 mg/L	all year	001
BOD, 5-day, 20 deg. C	maximum 7-day average	≤ 45 mg/L	all year	001
BOD, 5-day, 20 deg. C	maximum 7-day average	≤ 45 mg/L	all year	001
pH	minimum	≥ 6.5 SU	all year	001
pH	maximum	≤ 9 SU	all year	001
Solids, total suspended	30-day average	≤ 75 mg/L	all year	001
Solids, total suspended	30-day average	≤ 30 mg/L	all year	001
Solids, total suspended	maximum 7-day average	≤ 110 mg/L	all year	001
Solids, total suspended	maximum 7-day average	≤ 45 mg/L	all year	001
Nitrogen, ammonia total [as N]	30-day average	≤ 10.4 mg/L	Jun	001
Nitrogen, ammonia total [as N]	30-day average	≤ 8.6 mg/L	Sep	001
Nitrogen, ammonia total [as N]	30-day average	≤ 7.3 mg/L	Aug	001
Nitrogen, ammonia total [as N]	30-day average	≤ 5.9 mg/L	Jul	001
Nitrogen, ammonia total [as N]	30-day average	≤ 2.9 mg/L	Mar	001
Nitrogen, ammonia total [as N]	30-day average	≤ 4.8 mg/L	Jan	001
Nitrogen, ammonia total [as N]	30-day average	≤ 4.9 mg/L	Feb	001
Nitrogen, ammonia total [as N]	30-day average	≤ 8 mg/L	Oct	001
Nitrogen, ammonia total [as N]	30-day average	≤ 8.2 mg/L	Nov	001
Nitrogen, ammonia total [as N]	30-day average	≤ 8 mg/L	May	001
Nitrogen, ammonia total [as N]	30-day average	≤ 6 mg/L	Apr	001
Nitrogen, ammonia total [as N]	30-day average	≤ 7.1 mg/L	Dec	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 40 mg/L	Jun	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 31 mg/L	Sep	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 39 mg/L	Aug	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 34 mg/L	Jul	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 18 mg/L	Mar	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 13 mg/L	Jan	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 13 mg/L	Feb	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 24 mg/L	Oct	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 22 mg/L	Nov	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 29 mg/L	May	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 19 mg/L	Apr	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 18 mg/L	Dec	001
Nitrogen, nitrite total [as N]	30-day average	report only (mg/L)	all year	001
Nitrogen, nitrite total [as N]	30-day average	report only (mg/L)	all year	001
Nitrogen, nitrite total [as N]	daily maximum	report only (mg/L)	all year	001
Nitrogen, nitrite total [as N]	daily maximum	report only (mg/L)	all year	001
Chloride [as Cl]	30-day average	report only (mg/L)	all year	001
Chloride [as Cl]	30-day average	report only (mg/L)	all year	001
Iron, total recoverable	30-day average	report only (ug/L)	all year	001
Iron, total recoverable	30-day average	report only (ug/L)	all year	001
Silver, potentially dissolved	30-day average	≤ 5 ug/L	all year	001
Silver, potentially dissolved	30-day average	≤ 5 ug/L	all year	001
Silver, potentially dissolved	daily maximum	≤ 75 ug/L	all year	001
Silver, potentially dissolved	daily maximum	≤ 75 ug/L	all year	001
Copper, potentially dissolved	30-day average	≤ 38 ug/L	all year	001
Copper, potentially dissolved	30-day average	≤ 38 ug/L	all year	001
Copper, potentially dissolved	daily maximum	≤ 160 ug/L	all year	001
Copper, potentially dissolved	daily maximum	≤ 160 ug/L	all year	001
Cadmium, potentially dissolvd	30-day average	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
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	30-day average	report only (ug/L)	all year	001
Lead, potentially dissolvd	daily maximum	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	30-day average	report only (ug/L)	all year	001
Manganese, potentially dissolvd	daily maximum	report only (ug/L)	all year	001
Manganese, potentially dissolvd	daily maximum	report only (ug/L)	all year	001
Selenium, potentially dissolvd	30-day average	≤ 5 ug/L	all year	001
Selenium, potentially dissolvd	30-day average	≤ 5 ug/L	all year	001
Selenium, potentially dissolvd	daily maximum	≤ 53 ug/L	all year	001
Selenium, potentially dissolvd	daily maximum	≤ 53 ug/L	all year	001
Oil and grease	instantaneous maximum	≤ 10 mg/L	all year	001
Radium 226 + radium 228, total	30-day average	report only (pCi/L)	all year	001
Radium 226 + radium 228, total	daily maximum	report only (pCi/L)	all year	001
Di[2-ethylhexyl] phthalate [DEHP]	30-day average	≤ 9.2 ug/L	all year	001
Flow, in conduit or thru treatment plant	30-day average	≤ 2.68 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	report only (mg/L)	all year	001
Chlorine, total residual	30-day average	≤ .041 mg/L	all year	001
Chlorine, total residual	instantaneous maximum	≤ .1 mg/L	all year	001
Chlorine, total residual	instantaneous maximum	≤ .065 mg/L	all year	001
Chlordane	30-day average	report only (ug/L)	all year	001
Chlordane	daily maximum	report only (ug/L)	all year	001
E. coli	30-day geometric mean	≤ 131 #/100mL	all year	001
E. coli	30-day geometric mean	≤ 131 #/100mL	all year	001
E. coli	maximum 7-day geometric mean	≤ 262 #/100mL	all year	001
E. coli	maximum 7-day geometric mean	≤ 262 #/100mL	all year	001
Nonylphenol	30-day average	report only (ug/L)	all year	001
Nonylphenol	daily maximum	report only (ug/L)	all year	001
Mercury, total [as Hg]	30-day average	report only (ug/L)	all year	001
Mercury, total [as Hg]	30-day average	≤ .034 ug/L	all year	001
BOD, 5-day, percent removal	monthly average minimum	≥ 85 %	all year	001
BOD, 5-day, percent removal	monthly average minimum	≥ 85 %	all year	001
Solids, suspended percent removal	monthly average minimum	≥ 85 %	all year	001
Oil and grease visual	instantaneous maximum	report only (N=0;Y=1)	all year	001
Oil and grease visual	instantaneous maximum	report only (N=0;Y=1)	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	≥ 27 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	≥ 27 tox chronic	all year	001
Temperature, water deg. centigrade	maximum weekly average	report only (deg C)	all year	002
Temperature, water deg. centigrade	daily maximum	report only (deg C)	all year	002
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
pH	minimum	≥ 6.5 SU	all year	002
pH	maximum	≤ 9 SU	all year	002
Solids, total suspended	30-day average	≤ 30 mg/L	all year	002
Solids, total suspended	maximum 7-day average	≤ 45 mg/L	all year	002
Nitrogen, ammonia total [as N]	30-day average	report only (mg/L)	all year	002
Nitrogen, ammonia total [as N]	daily maximum	report only (mg/L)	all year	002
Nitrogen, nitrite total [as N]	30-day average	report only (mg/L)	all year	002
Nitrogen, nitrite total [as N]	daily maximum	report only (mg/L)	all year	002
Chloride [as Cl]	30-day average	report only (mg/L)	all year	002
Iron, total recoverable	30-day average	report only (ug/L)	all year	002
Silver, potentially dissolved	30-day average	≤ 5 ug/L	all year	002
Silver, potentially dissolved	daily maximum	≤ 75 ug/L	all year	002
Copper, potentially dissolved	30-day average	≤ 38 ug/L	all year	002
Copper, potentially dissolved	daily maximum	≤ 160 ug/L	all year	002
Cadmium, potentially dissolvd	30-day average	report only (ug/L)	all year	002
Cadmium, potentially dissolvd	daily maximum	report only (ug/L)	all year	002
Lead, potentially dissolvd	30-day average	report only (ug/L)	all year	002
Lead, potentially dissolvd	daily maximum	report only (ug/L)	all year	002
Manganese, potentially dissolvd	30-day average	report only (ug/L)	all year	002
Manganese, potentially dissolvd	daily maximum	report only (ug/L)	all year	002
Selenium, potentially dissolvd	30-day average	≤ 5 ug/L	all year	002
Selenium, potentially dissolvd	daily maximum	≤ 53 ug/L	all year	002
Oil and grease	instantaneous maximum	≤ 10 mg/L	all year	002
Radium 226 + radium 228, total	30-day average	report only (pCi/L)	all year	002
Radium 226 + radium 228, total	daily maximum	report only (pCi/L)	all year	002
Di[2-ethylhexyl] phthalate [DEHP]	30-day average	≤ 9.2 ug/L	all year	002
Flow, in conduit or thru treatment plant	30-day average	≤ 2.68 MGD	all year	002
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	002
Chlorine, total residual	30-day average	report only (mg/L)	all year	002
Chlorine, total residual	instantaneous maximum	≤ .5 mg/L	all year	002
Chlordane	30-day average	report only (ug/L)	all year	002
Chlordane	daily maximum	report only (ug/L)	all year	002
Nonylphenol	30-day average	report only (ug/L)	all year	002
Nonylphenol	daily maximum	report only (ug/L)	all year	002
Mercury, total [as Hg]	30-day average	report only (ug/L)	all year	002
Mercury, total [as Hg]	30-day average	≤ .034 ug/L	all year	002
BOD, 5-day, percent removal	monthly average minimum	≥ 85 %	all year	002
Solids, suspended percent removal	monthly average minimum	≥ 85 %	all year	002
Oil and grease visual	instantaneous maximum	report only (N=0;Y=1)	all year	002
Static Renewal 7 Day Chronic Ceriodaphnia dubia	single sample	report only (tox chronic)	all year	002
Static Renewal 7 Day Chronic Ceriodaphnia dubia	minimum value	report only (tox chronic)	all year	002
Static Renewal 7 Day Chronic Ceriodaphnia dubia	minimum value	≥ 27 tox chronic	all year	002
Static Renewal 7 Day Chronic Pimephales promelas	single sample	report only (tox chronic)	all year	002
Static Renewal 7 Day Chronic Pimephales promelas	minimum value	report only (tox chronic)	all year	002
Static Renewal 7 Day Chronic Pimephales promelas	minimum value	≥ 27 tox chronic	all year	002
pH	minimum	≥ 6.5 SU	all year	050
pH	minimum	≥ 6.5 SU	all year	050
pH	minimum	≥ 6.5 SU	all year	050
pH	minimum	≥ 6.5 SU	all year	050
pH	maximum	≤ 8.5 SU	all year	050
pH	maximum	≤ 8.5 SU	all year	050
pH	maximum	≤ 8.5 SU	all year	050
pH	maximum	≤ 8.5 SU	all year	050
pH	minimum	≥ 6.5 SU	all year	050
pH	minimum	≥ 6.5 SU	all year	050
pH	minimum	≥ 6.5 SU	all year	050
pH	minimum	≥ 6.5 SU	all year	050
pH	maximum	≤ 8.5 SU	all year	050
pH	maximum	≤ 8.5 SU	all year	050
pH	maximum	≤ 9 SU	all year	050
pH	maximum	≤ 8.5 SU	all year	050
Nitrogen, inorganic total	daily maximum	≤ 10 mg/L	all year	050
Nitrogen, inorganic total	daily maximum	≤ 10 mg/L	all year	050
Nitrogen, inorganic total	daily maximum	≤ 10 mg/L	all year	050
Nitrogen, inorganic total	daily maximum	≤ 10 mg/L	all year	050
Nitrogen, inorganic total	daily maximum	report only (mg/L)	all year	050
Nitrogen, inorganic total	daily maximum	report only (mg/L)	all year	050
Nitrogen, inorganic total	daily maximum	report only (mg/L)	all year	050
Nitrogen, inorganic total	daily maximum	report only (mg/L)	all year	050
Iron, dissolved [as Fe]	30-day average	report only (ug/L)	all year	050
Iron, dissolved [as Fe]	30-day average	report only (ug/L)	all year	050
Iron, dissolved [as Fe]	30-day average	report only (ug/L)	all year	050
Iron, dissolved [as Fe]	30-day average	report only (ug/L)	all year	050
Iron, dissolved [as Fe]	30-day average	report only (ug/L)	all year	050
Iron, dissolved [as Fe]	30-day average	report only (ug/L)	all year	050
Iron, dissolved [as Fe]	30-day average	report only (ug/L)	all year	050
Iron, dissolved [as Fe]	30-day average	report only (ug/L)	all year	050
Di[2-ethylhexyl] phthalate [DEHP]	30-day average	≤ 9.2 ug/L	all year	050
Di[2-ethylhexyl] phthalate [DEHP]	30-day average	≤ 9.2 ug/L	all year	050
Di[2-ethylhexyl] phthalate [DEHP]	30-day average	≤ 9.2 ug/L	all year	050
Di[2-ethylhexyl] phthalate [DEHP]	30-day average	≤ 9.2 ug/L	all year	050
Di[2-ethylhexyl] phthalate [DEHP]	30-day average	≤ 9.2 ug/L	all year	050
Di[2-ethylhexyl] phthalate [DEHP]	30-day average	≤ 9.2 ug/L	all year	050
Di[2-ethylhexyl] phthalate [DEHP]	30-day average	≤ 9.2 ug/L	all year	050
Di[2-ethylhexyl] phthalate [DEHP]	30-day average	≤ 9.2 ug/L	all year	050
Di[2-ethylhexyl] phthalate [DEHP]	30-day average	≤ 2.5 ug/L	all year	050
Di[2-ethylhexyl] phthalate [DEHP]	30-day average	≤ 2.5 ug/L	all year	050
Di[2-ethylhexyl] phthalate [DEHP]	30-day average	≤ 2.5 ug/L	all year	050
Di[2-ethylhexyl] phthalate [DEHP]	30-day average	≤ 2.5 ug/L	all year	050
Solids, total dissolved	30-day average	report only (mg/L)	all year	050
Solids, total dissolved	30-day average	report only (mg/L)	all year	050
Solids, total dissolved	30-day average	report only (mg/L)	all year	050
Solids, total dissolved	30-day average	report only (mg/L)	all year	050
Coliform, total general	30-day average	≤ 2.2 #/100mL	all year	050
Coliform, total general	30-day average	≤ 2.2 #/100mL	all year	050
Coliform, total general	30-day average	≤ 2.2 #/100mL	all year	050
Coliform, total general	30-day average	≤ 2.2 #/100mL	all year	050
Coliform, total general	daily maximum	≤ 23 #/100mL	all year	050
Coliform, total general	daily maximum	≤ 23 #/100mL	all year	050
Coliform, total general	daily maximum	≤ 23 #/100mL	all year	050
Coliform, total general	daily maximum	≤ 23 #/100mL	all year	050
Water level relative to mean sea level	30-day average	report only (ft)	all year	050
Water level relative to mean sea level	30-day average	report only (ft)	all year	050
Water level relative to mean sea level	30-day average	report only (ft)	all year	050
Water level relative to mean sea level	30-day average	report only (ft)	all year	050
Plant capacity fact. percent of capacity	30-day average	report only (%)	all year	300
Plant capacity fact. percent of capacity	30-day average	report only (%)	all year	300
BOD, 5-day, 20 deg. C	30-day average	report only (mg/L)	all year	300
BOD, 5-day, 20 deg. C	30-day average	report only (mg/L)	all year	300
BOD, 5-day, 20 deg. C	maximum 7-day average	report only (mg/L)	all year	300
BOD, 5-day, 20 deg. C	maximum 7-day average	report only (mg/L)	all year	300
BOD, 5-day, 20 deg. C	30-day average	report only (lb/d)	all year	300
BOD, 5-day, 20 deg. C	30-day average	report only (lb/d)	all year	300
BOD, 5-day, 20 deg. C	maximum 7-day average	report only (lb/d)	all year	300
BOD, 5-day, 20 deg. C	maximum 7-day average	report only (lb/d)	all year	300
Solids, total suspended	30-day average	report only (mg/L)	all year	300
Solids, total suspended	30-day average	report only (mg/L)	all year	300
Solids, total suspended	maximum 7-day average	report only (mg/L)	all year	300
Solids, total suspended	maximum 7-day average	report only (mg/L)	all year	300
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	report only (MGD)	all year	300

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/CO0026247 · MCP: https://passage-data.com/mcp