CITY OF GARNAVILLO

NPDES permit IA0026697 · Minor POTW · effective, expires 2031-08-31 · EPA's file as of 2026-09-19

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

3values over a limit
6required values missing, on 1 form(s)
0of 11 forms filed late

Last period with anything received: 2026-07-31. Most often over: pH (3).

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 (59)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]DAILY MN >= 1 mg/L all year
001pHDAILY MN >= 6 SU all year
001pHDAILY MX <= 9 SU all year
001Solids, total suspended30DA AVG <= 80 mg/L all year
001Solids, total suspended7 DA AVG <= 120 mg/L all year
001Solids, total suspended30DA AVG <= 129 lb/d all year
001Solids, total suspended7 DA AVG <= 194 lb/d all year
001Nitrogen, ammonia total [as N]30DA AVG <= 18 mg/L Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 15 mg/L Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 16 mg/L May
001Nitrogen, ammonia total [as N]30DA AVG <= 32 mg/L Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 25 mg/L Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 32 mg/L Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 15 mg/L Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 15 mg/L Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 15 mg/L Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 15 mg/L Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 15 mg/L Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 36 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 30 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 25 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 25 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 50 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 30 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 50 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 25 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 20 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 20 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 25 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 20 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 40 mg/L Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 25 lb/d Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 10 lb/d Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 30 lb/d May
001Nitrogen, ammonia total [as N]30DA AVG <= 30 lb/d Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 20 lb/d Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 25 lb/d Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 15 lb/d Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 30 lb/d Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 15 lb/d Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 15 lb/d Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 20 lb/d Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 35 lb/d Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 50 lb/d Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 40 lb/d Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 50 lb/d May
001Nitrogen, ammonia total [as N]DAILY MX <= 60 lb/d Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 40 lb/d Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 40 lb/d Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 40 lb/d Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 50 lb/d Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 40 lb/d Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 40 lb/d Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 40 lb/d Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 60 lb/d Mar
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 <= 40 lb/d all year
001BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 65 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