Colorado Air & Space Port — NPDES permit CO0047741: limits, due date and EPA's record

Sewerage Systems, Watkins, Colorado. NPDES permit CO0047741 expired Dec 31, 2022; its limits still apply. Last 12 months: over a limit 2 times (last November 2025). Source: EPA ECHO, Oct 22, 2026.

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

Period ending	Parameter	Reported	Limit	Over by
November 2025	Nitrogen, ammonia total [as N], 30-day average	11.2 mg/L	≤ 3.7 mg/L	203%
November 2025	Nitrogen, ammonia total [as N], daily maximum	22.4 mg/L	≤ 19 mg/L	18%

Limits in force (71)

Parameter	Statistic	Limit	Months	Outfall
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
pH	minimum	≥ 6.5 SU	all year	001
pH	maximum	≤ 9 SU	all year	001
Solids, total suspended	30-day average	≤ 30 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	≤ 3.5 mg/L	Apr	001
Nitrogen, ammonia total [as N]	30-day average	≤ 4.4 mg/L	Jan	001
Nitrogen, ammonia total [as N]	30-day average	≤ 4.5 mg/L	Feb	001
Nitrogen, ammonia total [as N]	30-day average	≤ 2.7 mg/L	Aug	001
Nitrogen, ammonia total [as N]	30-day average	≤ 2.6 mg/L	Jun	001
Nitrogen, ammonia total [as N]	30-day average	≤ 3.1 mg/L	May	001
Nitrogen, ammonia total [as N]	30-day average	≤ 2.3 mg/L	Jul	001
Nitrogen, ammonia total [as N]	30-day average	≤ 4.2 mg/L	Dec	001
Nitrogen, ammonia total [as N]	30-day average	≤ 4.1 mg/L	Mar	001
Nitrogen, ammonia total [as N]	30-day average	≤ 3.7 mg/L	Nov	001
Nitrogen, ammonia total [as N]	30-day average	≤ 2.4 mg/L	Sep	001
Nitrogen, ammonia total [as N]	30-day average	≤ 3 mg/L	Oct	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 17 mg/L	Apr	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 19 mg/L	Jan	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 19 mg/L	Feb	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 22 mg/L	Aug	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 17 mg/L	Jun	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 17 mg/L	May	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 17 mg/L	Jul	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 18 mg/L	Dec	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 19 mg/L	Mar	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 19 mg/L	Nov	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 17 mg/L	Sep	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 19 mg/L	Oct	001
Oil and grease	instantaneous maximum	≤ 10 mg/L	all year	001
Flow, in conduit or thru treatment plant	30-day average	≤ .025 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
E. coli	30-day geometric mean	≤ 126 #/100mL	all year	001
E. coli	maximum 7-day geometric mean	≤ 252 #/100mL	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 (abst=0;prst=1)	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
pH	minimum	≥ 6.5 SU	all year	002
pH	maximum	≤ 8.5 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, inorganic total	30-day average	report only (mg/L)	all year	002
Nitrogen, inorganic total	daily maximum	≤ 10 mg/L	all year	002
Chloride [as Cl]	30-day average	≤ 250 mg/L	all year	002
Chloride [as Cl]	daily maximum	report only (mg/L)	all year	002
Oil and grease	instantaneous maximum	≤ 10 mg/L	all year	002
Flow, in conduit or thru treatment plant	30-day average	≤ .025 MGD	all year	002
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	002
Solids, total dissolved	30-day average	≤ 400 mg/L	all year	002
Solids, total dissolved	daily maximum	report only (mg/L)	all year	002
Coliform, total general	30-day average	< 2.2 #/100mL	all year	002
Coliform, total general	daily maximum	≤ 23 #/100mL	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
Sulfate	30-day average	≤ 250 mg/L	all year	002
Oil and grease visual	instantaneous maximum	report only (abst=0;prst=1)	all year	002
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	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	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	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/CO0047741 · MCP: https://passage-data.com/mcp