Guernsey, Town of — NPDES permit WY0021831: limits, due date and EPA's record

Sewage treatment plant, (Unknown City), Wyoming. NPDES permit WY0021831, in force until Jun 30, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Limits in force (155)

Parameter	Statistic	Limit	Months	Outfall
Temperature, water deg. centigrade	daily maximum	report only (deg C)	all year	001
Oxygen, dissolved [DO]	daily maximum	report only (mg/L)	all year	001
BOD, 5-day, 20 deg. C	monthly average	≤ 30 mg/L	all year	001
BOD, 5-day, 20 deg. C	monthly average	≤ 30 mg/L	all year	001
BOD, 5-day, 20 deg. C	weekly average	≤ 45 mg/L	all year	001
BOD, 5-day, 20 deg. C	weekly average	≤ 45 mg/L	all year	001
BOD, 5-day, 20 deg. C	daily maximum	report only (mg/L)	all year	001
BOD, 5-day, 20 deg. C	daily maximum	report only (mg/L)	all year	001
BOD, 5-day, 20 deg. C	monthly average	report only (mg/L)	all year	001
BOD, 5-day, 20 deg. C	monthly average	report only (mg/L)	all year	001
BOD, 5-day, 20 deg. C	weekly average	report only (mg/L)	all year	001
BOD, 5-day, 20 deg. C	weekly average	report only (mg/L)	all year	001
BOD, 5-day, 20 deg. C	daily maximum	report only (mg/L)	all year	001
BOD, 5-day, 20 deg. C	daily maximum	report only (mg/L)	all year	001
pH	instantaneous minimum	≥ 6.5 SU	all year	001
pH	instantaneous minimum	≥ 6.5 SU	all year	001
pH	instantaneous maximum	≤ 9 SU	all year	001
pH	instantaneous maximum	≤ 9 SU	all year	001
Solids, total suspended	monthly average	≤ 100 mg/L	all year	001
Solids, total suspended	monthly average	≤ 100 mg/L	all year	001
Solids, total suspended	weekly average	≤ 150 mg/L	all year	001
Solids, total suspended	weekly average	≤ 150 mg/L	all year	001
Solids, total suspended	daily maximum	report only (mg/L)	all year	001
Solids, total suspended	daily maximum	report only (mg/L)	all year	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1.6 mg/L	Nov	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1.6 mg/L	Nov	001
Nitrogen, ammonia total [as N]	monthly average	≤ 4 mg/L	Sep	001
Nitrogen, ammonia total [as N]	monthly average	≤ 4 mg/L	Sep	001
Nitrogen, ammonia total [as N]	monthly average	≤ 7.1 mg/L	May	001
Nitrogen, ammonia total [as N]	monthly average	≤ 7.1 mg/L	May	001
Nitrogen, ammonia total [as N]	monthly average	≤ 2 mg/L	Feb	001
Nitrogen, ammonia total [as N]	monthly average	≤ 2 mg/L	Feb	001
Nitrogen, ammonia total [as N]	monthly average	≤ 3.1 mg/L	Mar	001
Nitrogen, ammonia total [as N]	monthly average	≤ 3.1 mg/L	Mar	001
Nitrogen, ammonia total [as N]	monthly average	≤ 3.3 mg/L	Oct	001
Nitrogen, ammonia total [as N]	monthly average	≤ 3.3 mg/L	Oct	001
Nitrogen, ammonia total [as N]	monthly average	≤ 2.6 mg/L	Jan	001
Nitrogen, ammonia total [as N]	monthly average	≤ 2.6 mg/L	Jan	001
Nitrogen, ammonia total [as N]	monthly average	≤ 3.8 mg/L	Apr	001
Nitrogen, ammonia total [as N]	monthly average	≤ 3.8 mg/L	Apr	001
Nitrogen, ammonia total [as N]	monthly average	≤ 2.2 mg/L	Dec	001
Nitrogen, ammonia total [as N]	monthly average	≤ 2.2 mg/L	Dec	001
Nitrogen, ammonia total [as N]	monthly average	≤ 5.4 mg/L	Jun	001
Nitrogen, ammonia total [as N]	monthly average	≤ 5.4 mg/L	Jun	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 5.9 mg/L	Nov	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 5.9 mg/L	Nov	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 14.8 mg/L	Sep	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 14.8 mg/L	Sep	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 20.2 mg/L	May	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 20.2 mg/L	May	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7.7 mg/L	Feb	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7.7 mg/L	Feb	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7.1 mg/L	Mar	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7.1 mg/L	Mar	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 15.7 mg/L	Oct	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 15.7 mg/L	Oct	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 8.9 mg/L	Jan	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 8.9 mg/L	Jan	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 8.9 mg/L	Apr	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 8.9 mg/L	Apr	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7.3 mg/L	Dec	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7.3 mg/L	Dec	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 20.2 mg/L	Jun	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 20.2 mg/L	Jun	001
Nitrite + Nitrate total [as N]	daily maximum	report only (mg/L)	all year	001
Phosphorus, total [as P]	daily maximum	report only (mg/L)	all year	001
Duration	monthly total	report only (d)	all year	001
Duration	monthly total	report only (d)	all year	001
Chlorine, total residual	daily maximum	≤ .01 mg/L	Jan	001
Chlorine, total residual	daily maximum	≤ .01 mg/L	Jan	001
Chlorine, total residual	daily maximum	≤ .01 mg/L	Nov	001
Chlorine, total residual	daily maximum	≤ .01 mg/L	Nov	001
Chlorine, total residual	daily maximum	≤ .01 mg/L	Dec	001
Chlorine, total residual	daily maximum	≤ .01 mg/L	Dec	001
Chlorine, total residual	daily maximum	≤ .03 mg/L	Jun	001
Chlorine, total residual	daily maximum	≤ .03 mg/L	Jun	001
Chlorine, total residual	daily maximum	≤ .02 mg/L (alert, not enforceable)	Apr	001
Chlorine, total residual	daily maximum	≤ .02 mg/L (alert, not enforceable)	Apr	001
Chlorine, total residual	daily maximum	≤ .02 mg/L	Sep	001
Chlorine, total residual	daily maximum	≤ .02 mg/L	Sep	001
Chlorine, total residual	daily maximum	≤ .02 mg/L	Feb	001
Chlorine, total residual	daily maximum	≤ .02 mg/L	Feb	001
Chlorine, total residual	daily maximum	≤ .03 mg/L	May	001
Chlorine, total residual	daily maximum	≤ .03 mg/L	May	001
Chlorine, total residual	daily maximum	≤ .02 mg/L	Oct	001
Chlorine, total residual	daily maximum	≤ .02 mg/L	Oct	001
Chlorine, total residual	daily maximum	≤ 1.75 mg/L	Jul	001
Chlorine, total residual	daily maximum	≤ 1.75 mg/L	Jul	001
Chlorine, total residual	daily maximum	≤ .01 mg/L	Mar	001
Chlorine, total residual	daily maximum	≤ .01 mg/L	Mar	001
Chlorine, total residual	daily maximum	≤ .6 mg/L	Aug	001
Chlorine, total residual	daily maximum	≤ .6 mg/L	Aug	001
E. coli	monthly geometric mean	≤ 809 #/100mL	Dec	001
E. coli	monthly geometric mean	≤ 809 #/100mL	Dec	001
E. coli	monthly geometric mean	≤ 278 #/100mL	May	001
E. coli	monthly geometric mean	≤ 278 #/100mL	May	001
E. coli	monthly geometric mean	≤ 5498 #/100mL	Aug	001
E. coli	monthly geometric mean	≤ 5498 #/100mL	Aug	001
E. coli	monthly geometric mean	≤ 793 #/100mL	Mar	001
E. coli	monthly geometric mean	≤ 793 #/100mL	Mar	001
E. coli	monthly geometric mean	≤ 825 #/100mL	Jan	001
E. coli	monthly geometric mean	≤ 825 #/100mL	Jan	001
E. coli	monthly geometric mean	≤ 278 #/100mL	Jun	001
E. coli	monthly geometric mean	≤ 278 #/100mL	Jun	001
E. coli	monthly geometric mean	≤ 16097 #/100mL	Jul	001
E. coli	monthly geometric mean	≤ 16097 #/100mL	Jul	001
E. coli	monthly geometric mean	≤ 858 #/100mL	Oct	001
E. coli	monthly geometric mean	≤ 858 #/100mL	Oct	001
E. coli	monthly geometric mean	≤ 858 #/100mL	Feb	001
E. coli	monthly geometric mean	≤ 858 #/100mL	Feb	001
E. coli	monthly geometric mean	≤ 210 #/100mL	Sep	001
E. coli	monthly geometric mean	≤ 210 #/100mL	Sep	001
E. coli	monthly geometric mean	≤ 186 #/100mL	Apr	001
E. coli	monthly geometric mean	≤ 186 #/100mL	Apr	001
E. coli	monthly geometric mean	≤ 793 #/100mL	Nov	001
E. coli	monthly geometric mean	≤ 793 #/100mL	Nov	001
E. coli	daily maximum	≤ 809 #/100mL	Dec	001
E. coli	daily maximum	≤ 809 #/100mL	Dec	001
E. coli	daily maximum	≤ 709 #/100mL	May	001
E. coli	daily maximum	≤ 709 #/100mL	May	001
E. coli	daily maximum	≤ 14818 #/100mL	Aug	001
E. coli	daily maximum	≤ 14818 #/100mL	Aug	001
E. coli	daily maximum	≤ 793 #/100mL	Mar	001
E. coli	daily maximum	≤ 793 #/100mL	Mar	001
E. coli	daily maximum	≤ 825 #/100mL	Jan	001
E. coli	daily maximum	≤ 825 #/100mL	Jan	001
E. coli	daily maximum	≤ 709 #/100mL	Jun	001
E. coli	daily maximum	≤ 709 #/100mL	Jun	001
E. coli	daily maximum	≤ 43468 #/100mL	Jul	001
E. coli	daily maximum	≤ 43468 #/100mL	Jul	001
E. coli	daily maximum	≤ 858 #/100mL	Oct	001
E. coli	daily maximum	≤ 858 #/100mL	Oct	001
E. coli	daily maximum	≤ 858 #/100mL	Feb	001
E. coli	daily maximum	≤ 858 #/100mL	Feb	001
E. coli	daily maximum	≤ 525 #/100mL	Sep	001
E. coli	daily maximum	≤ 525 #/100mL	Sep	001
E. coli	daily maximum	≤ 459 #/100mL	Apr	001
E. coli	daily maximum	≤ 459 #/100mL	Apr	001
E. coli	daily maximum	≤ 793 #/100mL	Nov	001
E. coli	daily maximum	≤ 793 #/100mL	Nov	001
Solids, total dissolved	daily maximum	report only (mg/L)	all year	001
Flow	monthly average	report only (MGD)	all year	001
Flow	monthly average	report only (MGD)	all year	001
Flow	daily maximum	report only (MGD)	all year	001
Flow	daily maximum	report only (MGD)	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
Produced water, oil and grease	daily maximum	≤ 10 mg/L	all year	001
Produced water, oil and grease	daily maximum	≤ 10 mg/L	all year	001
Temperature, water deg. centigrade	daily average	report only (deg C)	all year	DMP1
Temperature, water deg. centigrade	daily average	report only (deg C)	all year	DMP1
pH	instantaneous minimum	report only (SU)	all year	DMP1
pH	instantaneous minimum	report only (SU)	all year	DMP1
pH	instantaneous maximum	report only (SU)	all year	DMP1
pH	instantaneous maximum	report only (SU)	all year	DMP1

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/WY0021831 · MCP: https://passage-data.com/mcp