CITY OF FAIRFIELD

NPDES permit IA0082325 · Minor NON-POTW · effective, expires 2031-02-28 · EPA's file as of 2026-09-19

Check this month's numbers before you file

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

4values over a limit
18required values missing, on 1 form(s)
0of 12 forms filed late

Last period with anything received: 2026-08-31. Most often over: Sulfate, total [as SO4] (4).

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
001pHDAILY MN >= 6.5 SU all year
001pHDAILY MX <= 9 SU all year
001Solids, total suspended30DA AVG <= 30 mg/L all year
001Solids, total suspendedDAILY MX <= 45 mg/L all year
001Solids, total suspended30DA AVG <= 43.8 lb/d all year
001Solids, total suspendedDAILY MX <= 65.7 lb/d all year
001Nitrogen, ammonia total [as N]30DA AVG <= 1 mg/L Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 1.5 mg/L Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 1.3 mg/L Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 3.4 mg/L Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 1.6 mg/L Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 1.1 mg/L Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 2.3 mg/L Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 4 mg/L Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 3.4 mg/L Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 1 mg/L Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 2.5 mg/L Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 1.7 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 3.2 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 4.7 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 3.2 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 19.9 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 2.7 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 2.7 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 2.7 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 8.4 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 3.9 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 2.7 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 3.9 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 3.2 mg/L May
001Nitrogen, ammonia total [as N]30DA AVG <= 1.5 lb/d Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 2.2 lb/d Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 1.9 lb/d Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 5 lb/d Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 2.3 lb/d Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 1.5 lb/d Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 3.4 lb/d Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 5.8 lb/d Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 5 lb/d Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 1.4 lb/d Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 3.6 lb/d Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 2.5 lb/d May
001Nitrogen, ammonia total [as N]DAILY MX <= 4.7 lb/d Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 6.9 lb/d Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 4.7 lb/d Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 29 lb/d Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 3.9 lb/d Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 3.9 lb/d Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 3.9 lb/d Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 12.3 lb/d Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 5.7 lb/d Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 3.9 lb/d Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 5.7 lb/d Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 4.7 lb/d May
001Chloride [as Cl]30DA AVG <= 389 mg/L all year
001Chloride [as Cl]DAILY MX <= 629 mg/L all year
001Chloride [as Cl]30DA AVG <= 567 lb/d all year
001Chloride [as Cl]DAILY MX <= 918 lb/d all year
001Sulfate, total [as SO4]30DA AVG <= 1514 mg/L all year
001Sulfate, total [as SO4]DAILY MX <= 1514 mg/L all year
001Sulfate, total [as SO4]30DA AVG <= 2209 lb/d all year
001Sulfate, total [as SO4]DAILY MX <= 2209 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