City of Ridgeway

NPDES permit IA0058726 · Minor POTW · effective, expires 2029-08-31 · 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

1values over a limit
47required values missing, on 9 form(s)
0of 11 forms filed late

Last period with anything received: 2026-07-31. Most often over: BOD, carbonaceous [5 day, 20 C] (1).

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 (61)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]DAILY MN >= 4 mg/L all year
001pHDAILY MN >= 6.4 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 <= 15 lb/d all year
001Solids, total suspended7 DA AVG <= 23 lb/d all year
001Nitrogen, ammonia total [as N]30DA AVG <= 3.5 mg/L Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 6.3 mg/L Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 4.1 mg/L Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 9.1 mg/L Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 2.8 mg/L Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 4.2 mg/L Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 2.6 mg/L Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 6.7 mg/L Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 2.7 mg/L Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 9.6 mg/L Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 4.7 mg/L May
001Nitrogen, ammonia total [as N]30DA AVG <= 7.9 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 7.7 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 6.4 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 9.1 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 9.4 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 9.1 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 7.6 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 7.7 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 7.6 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 7.7 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 9.6 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 9.2 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 7.9 mg/L Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 1.8 lb/d Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 3 lb/d Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 2.1 lb/d Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 3.4 lb/d Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 1.4 lb/d Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 2.1 lb/d Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 1.3 lb/d Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 2.9 lb/d Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 1.4 lb/d Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 3.4 lb/d Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 2.3 lb/d May
001Nitrogen, ammonia total [as N]30DA AVG <= 3.4 lb/d Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 3.7 lb/d Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 3 lb/d Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 4.4 lb/d Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 4.4 lb/d Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 4.4 lb/d Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 3.6 lb/d Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 3.7 lb/d Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 3.6 lb/d Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 3.7 lb/d Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 4.5 lb/d Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 4.4 lb/d May
001Nitrogen, ammonia total [as N]DAILY MX <= 3.7 lb/d Jan
001E. coliGEO MEAN <= 630 #/100mL Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
001E. coliGEO MEAN <= 829 #/100mL Jan, Feb, Dec
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 <= 13 lb/d all year
001BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 20 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