Peabody Caballo Mining, LLC — NPDES permit WY0024031: limits, due date and EPA's record

Bituminous Coal And Lignite - Surface, Gillette, Wyoming. NPDES permit WY0024031, in force until Dec 31, 2028. Last 12 months: over a limit once (last February 2026). Source: EPA ECHO, Oct 22, 2026.

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

Period ending	Parameter	Reported	Limit	Over by
February 2026	Solids, total suspended, instantaneous maximum	74 mg/L	≤ 70 mg/L	6%

Limits in force (284)

Parameter	Statistic	Limit	Months	Outfall
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	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	instantaneous maximum	≤ 90 mg/L	all year	001
BOD, 5-day, 20 deg. C	instantaneous maximum	≤ 90 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	daily maximum	≤ 150 mg/L	all year	001
Solids, total suspended	daily maximum	≤ 150 mg/L	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	instantaneous maximum	≤ 300 mg/L	all year	001
Solids, total suspended	instantaneous maximum	≤ 300 mg/L	all year	001
Solids, settleable	daily maximum	≤ .5 mg/L	all year	001
Solids, settleable	daily maximum	≤ .5 mg/L	all year	001
Iron, total [as Fe]	instantaneous maximum	≤ 9 mg/L	all year	001
Iron, total [as Fe]	instantaneous maximum	≤ 9 mg/L	all year	001
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	001
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	001
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	001
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	001
Iron, dissolved [as Fe]	instantaneous maximum	≤ 1000 ug/L	all year	001
Iron, dissolved [as Fe]	instantaneous maximum	≤ 1000 ug/L	all year	001
Manganese, dissolved [as Mn]	instantaneous maximum	≤ 1462 ug/L	all year	001
Manganese, dissolved [as Mn]	instantaneous maximum	≤ 1462 ug/L	all year	001
Duration	daily maximum	report only (d)	all year	001
Duration	daily maximum	report only (d)	all year	001
Chlorine, total residual	instantaneous maximum	≤ .011 mg/L	all year	001
Chlorine, total residual	instantaneous maximum	≤ .011 mg/L	all year	001
E. coli	monthly average	≤ 630 #/100mL	Apr–Sep	001
E. coli	monthly average	≤ 630 #/100mL	Apr–Sep	001
E. coli	monthly average	≤ 126 #/100mL	Jan, Feb, Mar, Oct, Nov, Dec	001
E. coli	monthly average	≤ 126 #/100mL	Jan, Feb, Mar, Oct, Nov, Dec	001
E. coli	instantaneous maximum	≤ 630 #/100mL	Apr–Sep	001
E. coli	instantaneous maximum	≤ 630 #/100mL	Apr–Sep	001
E. coli	instantaneous maximum	≤ 576 #/100mL	Jan, Feb, Mar, Oct, Nov, Dec	001
E. coli	instantaneous maximum	≤ 576 #/100mL	Jan, Feb, Mar, Oct, Nov, Dec	001
Flow	monthly average	report only (MGD)	all year	001
Flow	monthly average	report only (MGD)	all year	001
Flow	instantaneous maximum	report only (MGD)	all year	001
Flow	instantaneous maximum	report only (MGD)	all year	001
pH	instantaneous minimum	≥ 6.5 SU	all year	002
pH	instantaneous minimum	≥ 6.5 SU	all year	002
pH	instantaneous maximum	≤ 9 SU	all year	002
pH	instantaneous maximum	≤ 9 SU	all year	002
Solids, total suspended	monthly average	≤ 35 mg/L	all year	002
Solids, total suspended	monthly average	≤ 35 mg/L	all year	002
Solids, total suspended	instantaneous maximum	≤ 70 mg/L	all year	002
Solids, total suspended	instantaneous maximum	≤ 70 mg/L	all year	002
Solids, settleable	instantaneous maximum	≤ .5 mL/L	all year	002
Solids, settleable	instantaneous maximum	≤ .5 mL/L	all year	002
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	002
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	002
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	002
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	002
Iron, total [as Fe]	instantaneous maximum	≤ 9 mg/L	all year	002
Iron, total [as Fe]	instantaneous maximum	≤ 9 mg/L	all year	002
Iron, dissolved [as Fe]	instantaneous maximum	≤ 1000 ug/L	all year	002
Iron, dissolved [as Fe]	instantaneous maximum	≤ 1000 ug/L	all year	002
Manganese, dissolved [as Mn]	instantaneous maximum	≤ 1462 ug/L	all year	002
Manganese, dissolved [as Mn]	instantaneous maximum	≤ 1462 ug/L	all year	002
Duration	monthly total	report only (d/mo)	all year	002
Duration	monthly total	report only (d/mo)	all year	002
Flow	monthly average	report only (MGD)	all year	002
Flow	monthly average	report only (MGD)	all year	002
Flow	instantaneous maximum	report only (MGD)	all year	002
Flow	instantaneous maximum	report only (MGD)	all year	002
pH	instantaneous minimum	≥ 6.5 SU	all year	013
pH	instantaneous minimum	≥ 6.5 SU	all year	013
pH	instantaneous maximum	≤ 9 SU	all year	013
pH	instantaneous maximum	≤ 9 SU	all year	013
Solids, total suspended	monthly average	≤ 35 mg/L	all year	013
Solids, total suspended	monthly average	≤ 35 mg/L	all year	013
Solids, total suspended	instantaneous maximum	≤ 70 mg/L	all year	013
Solids, total suspended	instantaneous maximum	≤ 70 mg/L	all year	013
Solids, settleable	instantaneous maximum	≤ .5 mL/L	all year	013
Solids, settleable	instantaneous maximum	≤ .5 mL/L	all year	013
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	013
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	013
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	013
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	013
Iron, total [as Fe]	instantaneous maximum	≤ 9 mg/L	all year	013
Iron, total [as Fe]	instantaneous maximum	≤ 9 mg/L	all year	013
Iron, dissolved [as Fe]	instantaneous maximum	≤ 1000 ug/L	all year	013
Iron, dissolved [as Fe]	instantaneous maximum	≤ 1000 ug/L	all year	013
Manganese, total [as Mn]	monthly average	≤ 2 mg/L	all year	013
Manganese, total [as Mn]	monthly average	≤ 2 mg/L	all year	013
Manganese, total [as Mn]	daily maximum	≤ 4 mg/L	all year	013
Manganese, total [as Mn]	daily maximum	≤ 4 mg/L	all year	013
Manganese, total [as Mn]	instantaneous maximum	≤ 6 mg/L	all year	013
Manganese, total [as Mn]	instantaneous maximum	≤ 6 mg/L	all year	013
Manganese, dissolved [as Mn]	instantaneous maximum	≤ 1462 ug/L	all year	013
Manganese, dissolved [as Mn]	instantaneous maximum	≤ 1462 ug/L	all year	013
Duration	monthly total	report only (d/mo)	all year	013
Duration	monthly total	report only (d/mo)	all year	013
Flow	monthly average	report only (MGD)	all year	013
Flow	monthly average	report only (MGD)	all year	013
Flow	instantaneous maximum	report only (MGD)	all year	013
Flow	instantaneous maximum	report only (MGD)	all year	013
pH	instantaneous minimum	≥ 6.5 SU	all year	015
pH	instantaneous minimum	≥ 6.5 SU	all year	015
pH	instantaneous maximum	≤ 9 SU	all year	015
pH	instantaneous maximum	≤ 9 SU	all year	015
Solids, total suspended	monthly average	≤ 35 mg/L	all year	015
Solids, total suspended	monthly average	≤ 35 mg/L	all year	015
Solids, total suspended	instantaneous maximum	≤ 70 mg/L	all year	015
Solids, total suspended	instantaneous maximum	≤ 70 mg/L	all year	015
Solids, settleable	instantaneous maximum	≤ .5 mL/L	all year	015
Solids, settleable	instantaneous maximum	≤ .5 mL/L	all year	015
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	015
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	015
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	015
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	015
Iron, total [as Fe]	instantaneous maximum	≤ 9 mg/L	all year	015
Iron, total [as Fe]	instantaneous maximum	≤ 9 mg/L	all year	015
Iron, dissolved [as Fe]	instantaneous maximum	≤ 1000 ug/L	all year	015
Iron, dissolved [as Fe]	instantaneous maximum	≤ 1000 ug/L	all year	015
Manganese, dissolved [as Mn]	instantaneous maximum	≤ 1462 ug/L	all year	015
Manganese, dissolved [as Mn]	instantaneous maximum	≤ 1462 ug/L	all year	015
Duration	monthly total	report only (d/mo)	all year	015
Duration	monthly total	report only (d/mo)	all year	015
Flow	monthly average	report only (MGD)	all year	015
Flow	monthly average	report only (MGD)	all year	015
Flow	instantaneous maximum	report only (MGD)	all year	015
Flow	instantaneous maximum	report only (MGD)	all year	015
pH	instantaneous minimum	≥ 6.5 SU	all year	016
pH	instantaneous minimum	≥ 6.5 SU	all year	016
pH	instantaneous maximum	≤ 9 SU	all year	016
pH	instantaneous maximum	≤ 9 SU	all year	016
Solids, total suspended	monthly average	≤ 35 mg/L	all year	016
Solids, total suspended	monthly average	≤ 35 mg/L	all year	016
Solids, total suspended	instantaneous maximum	≤ 70 mg/L	all year	016
Solids, total suspended	instantaneous maximum	≤ 70 mg/L	all year	016
Solids, settleable	instantaneous maximum	≤ .5 mL/L	all year	016
Solids, settleable	instantaneous maximum	≤ .5 mL/L	all year	016
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	016
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	016
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	016
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	016
Iron, total [as Fe]	instantaneous maximum	≤ 9 mg/L	all year	016
Iron, total [as Fe]	instantaneous maximum	≤ 9 mg/L	all year	016
Iron, dissolved [as Fe]	instantaneous maximum	≤ 1000 ug/L	all year	016
Iron, dissolved [as Fe]	instantaneous maximum	≤ 1000 ug/L	all year	016
Manganese, dissolved [as Mn]	instantaneous maximum	≤ 1462 ug/L	all year	016
Manganese, dissolved [as Mn]	instantaneous maximum	≤ 1462 ug/L	all year	016
Duration	monthly total	report only (d/mo)	all year	016
Duration	monthly total	report only (d/mo)	all year	016
Flow	monthly average	report only (MGD)	all year	016
Flow	monthly average	report only (MGD)	all year	016
Flow	instantaneous maximum	report only (MGD)	all year	016
Flow	instantaneous maximum	report only (MGD)	all year	016
pH	instantaneous minimum	≥ 6.5 SU	all year	017
pH	instantaneous minimum	≥ 6.5 SU	all year	017
pH	instantaneous maximum	≤ 9 SU	all year	017
pH	instantaneous maximum	≤ 9 SU	all year	017
Solids, total suspended	monthly average	≤ 35 mg/L	all year	017
Solids, total suspended	monthly average	≤ 35 mg/L	all year	017
Solids, total suspended	instantaneous maximum	≤ 70 mg/L	all year	017
Solids, total suspended	instantaneous maximum	≤ 70 mg/L	all year	017
Solids, settleable	instantaneous maximum	≤ .5 mL/L	all year	017
Solids, settleable	instantaneous maximum	≤ .5 mL/L	all year	017
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	017
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	017
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	017
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	017
Iron, total [as Fe]	instantaneous maximum	≤ 9 mg/L	all year	017
Iron, total [as Fe]	instantaneous maximum	≤ 9 mg/L	all year	017
Iron, dissolved [as Fe]	instantaneous maximum	≤ 1000 ug/L	all year	017
Iron, dissolved [as Fe]	instantaneous maximum	≤ 1000 ug/L	all year	017
Manganese, dissolved [as Mn]	instantaneous maximum	≤ 1462 ug/L	all year	017
Manganese, dissolved [as Mn]	instantaneous maximum	≤ 1462 ug/L	all year	017
Duration	monthly total	report only (d/mo)	all year	017
Duration	monthly total	report only (d/mo)	all year	017
Flow	monthly average	report only (MGD)	all year	017
Flow	monthly average	report only (MGD)	all year	017
Flow	instantaneous maximum	report only (MGD)	all year	017
Flow	instantaneous maximum	report only (MGD)	all year	017
pH	instantaneous minimum	≥ 6.5 SU	all year	018
pH	instantaneous minimum	≥ 6.5 SU	all year	018
pH	instantaneous maximum	≤ 9 SU	all year	018
pH	instantaneous maximum	≤ 9 SU	all year	018
Solids, total suspended	monthly average	≤ 35 mg/L	all year	018
Solids, total suspended	monthly average	≤ 35 mg/L	all year	018
Solids, total suspended	instantaneous maximum	≤ 70 mg/L	all year	018
Solids, total suspended	instantaneous maximum	≤ 70 mg/L	all year	018
Solids, settleable	instantaneous maximum	≤ .5 mL/L	all year	018
Solids, settleable	instantaneous maximum	≤ .5 mL/L	all year	018
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	018
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	018
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	018
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	018
Iron, total [as Fe]	instantaneous maximum	≤ 9 mg/L	all year	018
Iron, total [as Fe]	instantaneous maximum	≤ 9 mg/L	all year	018
Iron, dissolved [as Fe]	instantaneous maximum	≤ 1000 ug/L	all year	018
Iron, dissolved [as Fe]	instantaneous maximum	≤ 1000 ug/L	all year	018
Manganese, dissolved [as Mn]	instantaneous maximum	≤ 1462 ug/L	all year	018
Manganese, dissolved [as Mn]	instantaneous maximum	≤ 1462 ug/L	all year	018
Duration	monthly total	report only (d/mo)	all year	018
Duration	monthly total	report only (d/mo)	all year	018
Flow	monthly average	report only (MGD)	all year	018
Flow	monthly average	report only (MGD)	all year	018
Flow	instantaneous maximum	report only (MGD)	all year	018
Flow	instantaneous maximum	report only (MGD)	all year	018
pH	instantaneous minimum	≥ 6.5 SU	all year	019
pH	instantaneous minimum	≥ 6.5 SU	all year	019
pH	instantaneous maximum	≤ 9 SU	all year	019
pH	instantaneous maximum	≤ 9 SU	all year	019
Solids, total suspended	monthly average	≤ 35 mg/L	all year	019
Solids, total suspended	monthly average	≤ 35 mg/L	all year	019
Solids, total suspended	instantaneous maximum	≤ 70 mg/L	all year	019
Solids, total suspended	instantaneous maximum	≤ 70 mg/L	all year	019
Solids, settleable	instantaneous maximum	≤ .5 mL/L	all year	019
Solids, settleable	instantaneous maximum	≤ .5 mL/L	all year	019
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	019
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	019
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	019
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	019
Iron, total [as Fe]	instantaneous maximum	≤ 9 mg/L	all year	019
Iron, total [as Fe]	instantaneous maximum	≤ 9 mg/L	all year	019
Iron, dissolved [as Fe]	instantaneous maximum	≤ 1000 ug/L	all year	019
Iron, dissolved [as Fe]	instantaneous maximum	≤ 1000 ug/L	all year	019
Manganese, dissolved [as Mn]	instantaneous maximum	≤ 1462 ug/L	all year	019
Manganese, dissolved [as Mn]	instantaneous maximum	≤ 1462 ug/L	all year	019
Duration	monthly total	report only (d/mo)	all year	019
Duration	monthly total	report only (d/mo)	all year	019
Flow	monthly average	report only (MGD)	all year	019
Flow	monthly average	report only (MGD)	all year	019
Flow	instantaneous maximum	report only (MGD)	all year	019
Flow	instantaneous maximum	report only (MGD)	all year	019
pH	instantaneous minimum	≥ 6.5 SU	all year	020
pH	instantaneous minimum	≥ 6.5 SU	all year	020
pH	instantaneous maximum	≤ 9 SU	all year	020
pH	instantaneous maximum	≤ 9 SU	all year	020
Solids, total suspended	monthly average	≤ 35 mg/L	all year	020
Solids, total suspended	monthly average	≤ 35 mg/L	all year	020
Solids, total suspended	instantaneous maximum	≤ 70 mg/L	all year	020
Solids, total suspended	instantaneous maximum	≤ 70 mg/L	all year	020
Solids, settleable	instantaneous maximum	≤ .5 mL/L	all year	020
Solids, settleable	instantaneous maximum	≤ .5 mL/L	all year	020
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	020
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	020
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	020
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	020
Iron, total [as Fe]	instantaneous maximum	≤ 9 mg/L	all year	020
Iron, total [as Fe]	instantaneous maximum	≤ 9 mg/L	all year	020
Iron, dissolved [as Fe]	instantaneous maximum	≤ 1000 ug/L	all year	020
Iron, dissolved [as Fe]	instantaneous maximum	≤ 1000 ug/L	all year	020
Manganese, dissolved [as Mn]	instantaneous maximum	≤ 1462 ug/L	all year	020
Manganese, dissolved [as Mn]	instantaneous maximum	≤ 1462 ug/L	all year	020
Duration	monthly total	report only (d/mo)	all year	020
Duration	monthly total	report only (d/mo)	all year	020
Flow	monthly average	report only (MGD)	all year	020
Flow	monthly average	report only (MGD)	all year	020
Flow	instantaneous maximum	report only (MGD)	all year	020
Flow	instantaneous maximum	report only (MGD)	all year	020
pH	instantaneous minimum	≥ 6.5 SU	all year	021
pH	instantaneous minimum	≥ 6.5 SU	all year	021
pH	instantaneous maximum	≤ 9 SU	all year	021
pH	instantaneous maximum	≤ 9 SU	all year	021
Solids, total suspended	monthly average	≤ 35 mg/L	all year	021
Solids, total suspended	monthly average	≤ 35 mg/L	all year	021
Solids, total suspended	instantaneous maximum	≤ 70 mg/L	all year	021
Solids, total suspended	instantaneous maximum	≤ 70 mg/L	all year	021
Solids, settleable	instantaneous maximum	≤ .5 mL/L	all year	021
Solids, settleable	instantaneous maximum	≤ .5 mL/L	all year	021
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	021
Iron, total [as Fe]	monthly average	≤ 3 mg/L	all year	021
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	021
Iron, total [as Fe]	daily maximum	≤ 6 mg/L	all year	021
Iron, total [as Fe]	instantaneous maximum	≤ 9 mg/L	all year	021
Iron, total [as Fe]	instantaneous maximum	≤ 9 mg/L	all year	021
Iron, dissolved [as Fe]	instantaneous maximum	≤ 1000 ug/L	all year	021
Iron, dissolved [as Fe]	instantaneous maximum	≤ 1000 ug/L	all year	021
Manganese, dissolved [as Mn]	instantaneous maximum	≤ 1462 ug/L	all year	021
Manganese, dissolved [as Mn]	instantaneous maximum	≤ 1462 ug/L	all year	021
Duration	monthly total	report only (d/mo)	all year	021
Duration	monthly total	report only (d/mo)	all year	021
Flow	monthly average	report only (MGD)	all year	021
Flow	monthly average	report only (MGD)	all year	021
Flow	instantaneous maximum	report only (MGD)	all year	021
Flow	instantaneous maximum	report only (MGD)	all year	021

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/WY0024031 · MCP: https://passage-data.com/mcp