CITY OF LE MARS

NPDES permit IA0036536 · Major POTW · effective, expires 2029-07-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

EPA's record, 2025-09-01 to 2026-08-31

2values over a limit
0required values missing, on 0 form(s)
0of 11 forms filed late

Last period with anything received: 2026-07-31. Most often over: Nitrogen, ammonia total [as N] (2).

Reporting

Reports are due about 15 days after each monitoring period ends (the most common figure among IA permits in EPA's filings — check your permit).

Limits in force (62)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]DAILY MN >= 4.3 mg/L all year
001pHDAILY MN >= 6.5 SU all year
001pHDAILY MX <= 9 SU all year
001Solids, total suspended30DA AVG <= 30 mg/L all year
001Solids, total suspended7 DA AVG <= 45 mg/L all year
001Solids, total suspended30DA AVG <= 898 lb/d all year
001Solids, total suspended7 DA AVG <= 1347 lb/d all year
001Nitrogen, ammonia total [as N]30DA AVG <= 6.8 mg/L Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 3.1 mg/L Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 5 mg/L Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 8 mg/L Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 2.1 mg/L Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 3.2 mg/L Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 2.7 mg/L Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 3.5 mg/L May
001Nitrogen, ammonia total [as N]30DA AVG <= 6.9 mg/L Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 2 mg/L Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 1.9 mg/L Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 4.7 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 15 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 16 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 16.2 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 14.5 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 16.8 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 16 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 14.7 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 15.5 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 15.5 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 17.9 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 16.5 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 14.9 mg/L Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 191.6 lb/d Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 86.4 lb/d Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 140.8 lb/d Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 223.9 lb/d Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 59.9 lb/d Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 88.5 lb/d Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 74.4 lb/d Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 98.7 lb/d May
001Nitrogen, ammonia total [as N]30DA AVG <= 194.3 lb/d Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 57 lb/d Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 54.1 lb/d Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 132.2 lb/d Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 447.7 lb/d Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 476.9 lb/d Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 484.9 lb/d Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 434 lb/d Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 500.9 lb/d Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 477 lb/d Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 439.4 lb/d Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 462.1 lb/d May
001Nitrogen, ammonia total [as N]DAILY MX <= 462.9 lb/d Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 534.7 lb/d Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 493.5 lb/d Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 446.2 lb/d Nov
001E. coliGEO MEAN <= 126 #/100mL Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
001Toxicity [acute], Ceriodaphnia dubiaDAILY MX <= 1 N=0;Y=1 all year
001Toxicity [acute], Pimephales promelas [Fathead Minnow]DAILY MX <= 1 N=0;Y=1 all year
001BOD, carbonaceous [5 day, 20 C]30DA AVG <= 25 mg/L all year
001BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 40 mg/L all year
001BOD, carbonaceous [5 day, 20 C]30DA AVG <= 748 lb/d all year
001BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 1198 lb/d all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states