Petersburg Municipal WWTP — NPDES permit IN0024325: limits, due date and EPA's record

Sewage treatment plant, major discharger, Petersburg, Indiana. NPDES permit IN0024325, in force until May 31, 2031. 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	Nitrogen, ammonia total [as N], maximum weekly average	16.98 mg/L	≤ 15.3 mg/L	11%
June 2026	001	E. coli, colony forming units [CFU], daily maximum	574.2 CFU/100mL	≤ 235 CFU/100mL	144%
June 2026	002	E. coli, colony forming units [CFU], daily maximum	574.2 CFU/100mL	≤ 235 CFU/100mL	144%
June 2026	002	E. coli, colony forming units [CFU], monthly geometric mean	211 CFU/100mL	≤ 125 CFU/100mL	69%
June 2026	002	Phosphorus, total [as P], monthly average	1.186 mg/L	≤ 1 mg/L	19%

Limits in force (42)

Parameter	Statistic	Limit	Months	Outfall
pH	daily minimum	≥ 6 SU	all year	001
pH	daily maximum	≤ 9 SU	all year	001
Solids, total suspended	monthly average	≤ 30 mg/L	all year	001
Solids, total suspended	maximum weekly average	≤ 45 mg/L	all year	001
Solids, total suspended	monthly average	≤ 330 lb/d	all year	001
Solids, total suspended	maximum weekly average	≤ 490 lb/d	all year	001
Nitrogen, ammonia total [as N]	monthly average	≤ 10.2 mg/L	all year	001
Nitrogen, ammonia total [as N]	maximum weekly average	≤ 15.3 mg/L	all year	001
Nitrogen, ammonia total [as N]	monthly average	≤ 51 lb/d	all year	001
Nitrogen, ammonia total [as N]	maximum weekly average	≤ 77 lb/d	all year	001
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	001
E. coli, colony forming units [CFU]	monthly geometric mean	≤ 125 CFU/100mL	Apr–Oct	001
E. coli, colony forming units [CFU]	daily maximum	≤ 235 CFU/100mL	Apr–Oct	001
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 25 mg/L	all year	001
BOD, carbonaceous [5 day, 20 C]	maximum weekly average	≤ 40 mg/L	all year	001
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 270 lb/d	all year	001
BOD, carbonaceous [5 day, 20 C]	maximum weekly average	≤ 430 lb/d	all year	001
Flow, total	monthly total	report only (Mgal/mo)	all year	001
pH	daily minimum	≥ 6 SU	all year	002
pH	daily maximum	≤ 9 SU	all year	002
Solids, total suspended	monthly average	≤ 30 mg/L	all year	002
Solids, total suspended	maximum weekly average	≤ 45 mg/L	all year	002
Solids, total suspended	monthly average	≤ 330 lb/d	all year	002
Solids, total suspended	maximum weekly average	≤ 490 lb/d	all year	002
Nitrogen, ammonia total [as N]	monthly average	≤ 1.3 mg/L	May–Nov	002
Nitrogen, ammonia total [as N]	monthly average	≤ 1.9 mg/L	Jan, Feb, Mar, Apr, Dec	002
Nitrogen, ammonia total [as N]	maximum weekly average	≤ 1.9 mg/L	May–Nov	002
Nitrogen, ammonia total [as N]	maximum weekly average	≤ 2.9 mg/L	Jan, Feb, Mar, Apr, Dec	002
Nitrogen, ammonia total [as N]	monthly average	≤ 14 lb/d	May–Nov	002
Nitrogen, ammonia total [as N]	monthly average	≤ 20 lb/d	Jan, Feb, Mar, Apr, Dec	002
Nitrogen, ammonia total [as N]	maximum weekly average	≤ 20 lb/d	May–Nov	002
Nitrogen, ammonia total [as N]	maximum weekly average	≤ 31 lb/d	Jan, Feb, Mar, Apr, Dec	002
Phosphorus, total [as P]	monthly average	≤ 1 mg/L	all year	002
Phosphorus, total [as P]	monthly average	report only (lb/d)	all year	002
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	002
E. coli, colony forming units [CFU]	monthly geometric mean	≤ 125 CFU/100mL	Apr–Oct	002
E. coli, colony forming units [CFU]	daily maximum	≤ 235 CFU/100mL	Apr–Oct	002
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 25 mg/L	all year	002
BOD, carbonaceous [5 day, 20 C]	maximum weekly average	≤ 40 mg/L	all year	002
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 270 lb/d	all year	002
BOD, carbonaceous [5 day, 20 C]	maximum weekly average	≤ 430 lb/d	all year	002
Flow, total	monthly total	report only (Mgal/mo)	all year	002

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/IN0024325 · MCP: https://passage-data.com/mcp