CITY OF WATERLOO

NPDES permit IA0042650 · Major POTW · administratively continued, expires 2026-05-31 · 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.

This permit expired on 2026-05-31 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

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

3values over a limit
6required values missing, on 2 form(s)
0of 44 forms filed late

Last period with anything received: 2026-07-31. Most often over: BOD, carbonaceous [5 day, 20 C] (2), pH (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 (208)

OutfallParameterStatisticLimitMonths
001BOD, 5-day, 20 deg. C30DA AVG report only all year
001BOD, 5-day, 20 deg. CDAILY MX report only all year
001BOD, 5-day, 20 deg. C30DA AVG report only all year
001BOD, 5-day, 20 deg. CDAILY MX report only all year
001pH30DA AVG report only all year
001pHDAILY MX report only 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 report only all year
001Solids, total suspendedDAILY MX report only all year
001Solids, total suspended30DA AVG report only all year
001Solids, total suspendedDAILY MX report only all year
001Nitrogen, total [as N]30DA AVG report only all year
001Nitrogen, total [as N]DAILY MX report only all year
001Nitrogen, total [as N]30DA AVG report only all year
001Nitrogen, total [as N]DAILY MX report only all year
001Nitrogen, Kjeldahl, total [as N]30DA AVG report only all year
001Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
001Nitrogen, Kjeldahl, total [as N]30DA AVG report only all year
001Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
001Phosphorus, total [as P]30DA AVG report only all year
001Phosphorus, total [as P]DAILY MX report only all year
001Phosphorus, total [as P]30DA AVG report only all year
001Phosphorus, total [as P]DAILY MX report only 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
008BOD, 5-day, 20 deg. C30DA AVG report only all year
008BOD, 5-day, 20 deg. CDAILY MX report only all year
008BOD, 5-day, 20 deg. C30DA AVG report only all year
008BOD, 5-day, 20 deg. CDAILY MX report only all year
008pH30DA AVG report only all year
008pHDAILY MX report only all year
008Solids, total suspended30DA AVG <= 30 mg/L all year
008Solids, total suspended7 DA AVG <= 45 mg/L all year
008Solids, total suspended30DA AVG report only all year
008Solids, total suspendedDAILY MX report only all year
008Solids, total suspended30DA AVG report only all year
008Solids, total suspendedDAILY MX report only all year
008Nitrogen, total [as N]30DA AVG report only all year
008Nitrogen, total [as N]DAILY MX report only all year
008Nitrogen, total [as N]30DA AVG report only all year
008Nitrogen, total [as N]DAILY MX report only all year
008Nitrogen, Kjeldahl, total [as N]30DA AVG report only all year
008Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
008Nitrogen, Kjeldahl, total [as N]30DA AVG report only all year
008Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
008Phosphorus, total [as P]30DA AVG report only all year
008Phosphorus, total [as P]DAILY MX report only all year
008Phosphorus, total [as P]30DA AVG report only all year
008Phosphorus, total [as P]DAILY MX report only all year
008BOD, carbonaceous [5 day, 20 C]30DA AVG <= 25 mg/L all year
008BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 40 mg/L all year
011BOD, 5-day, 20 deg. C30DA AVG report only all year
011BOD, 5-day, 20 deg. CDAILY MX report only all year
011BOD, 5-day, 20 deg. C30DA AVG report only all year
011BOD, 5-day, 20 deg. CDAILY MX report only all year
011pHDAILY MN >= 6 SU all year
011pHDAILY MX <= 9 SU all year
011Solids, total suspended30DA AVG <= 8707 lb/d all year
011Solids, total suspended7 DA AVG <= 13060 lb/d all year
011Nitrogen, total [as N]30DA AVG <= 9285.5 lb/d all year
011Nitrogen, total [as N]DAILY MX <= 15199 lb/d all year
011Nitrogen, ammonia total [as N]30DA AVG <= 68 mg/L Mar
011Nitrogen, ammonia total [as N]30DA AVG <= 55.2 mg/L Sep
011Nitrogen, ammonia total [as N]30DA AVG <= 78.4 mg/L Feb
011Nitrogen, ammonia total [as N]30DA AVG <= 62 mg/L Aug
011Nitrogen, ammonia total [as N]30DA AVG <= 52.5 mg/L Nov
011Nitrogen, ammonia total [as N]30DA AVG <= 54 mg/L Oct
011Nitrogen, ammonia total [as N]30DA AVG <= 69.4 mg/L Jan
011Nitrogen, ammonia total [as N]30DA AVG <= 54.3 mg/L Dec
011Nitrogen, ammonia total [as N]30DA AVG <= 59.5 mg/L Jun
011Nitrogen, ammonia total [as N]30DA AVG <= 64.1 mg/L Jul
011Nitrogen, ammonia total [as N]30DA AVG <= 60.5 mg/L May
011Nitrogen, ammonia total [as N]30DA AVG <= 53.9 mg/L Apr
011Nitrogen, ammonia total [as N]DAILY MX <= 68 mg/L Mar
011Nitrogen, ammonia total [as N]DAILY MX <= 55.2 mg/L Sep
011Nitrogen, ammonia total [as N]DAILY MX <= 78.4 mg/L Feb
011Nitrogen, ammonia total [as N]DAILY MX <= 62 mg/L Aug
011Nitrogen, ammonia total [as N]DAILY MX <= 52.5 mg/L Nov
011Nitrogen, ammonia total [as N]DAILY MX <= 54 mg/L Oct
011Nitrogen, ammonia total [as N]DAILY MX <= 69.4 mg/L Jan
011Nitrogen, ammonia total [as N]DAILY MX <= 54.3 mg/L Dec
011Nitrogen, ammonia total [as N]DAILY MX <= 59.5 mg/L Jun
011Nitrogen, ammonia total [as N]DAILY MX <= 64.1 mg/L Jul
011Nitrogen, ammonia total [as N]DAILY MX <= 60.5 mg/L May
011Nitrogen, ammonia total [as N]DAILY MX <= 53.9 mg/L Apr
011Nitrogen, ammonia total [as N]30DA AVG <= 12392 lb/d Mar
011Nitrogen, ammonia total [as N]30DA AVG <= 10890 lb/d Sep
011Nitrogen, ammonia total [as N]30DA AVG <= 13832 lb/d Feb
011Nitrogen, ammonia total [as N]30DA AVG <= 10982 lb/d Aug
011Nitrogen, ammonia total [as N]30DA AVG <= 10145 lb/d Nov
011Nitrogen, ammonia total [as N]30DA AVG <= 10558 lb/d Oct
011Nitrogen, ammonia total [as N]30DA AVG <= 12696 lb/d Jan
011Nitrogen, ammonia total [as N]30DA AVG <= 10655 lb/d Dec
011Nitrogen, ammonia total [as N]30DA AVG <= 10079 lb/d Jun
011Nitrogen, ammonia total [as N]30DA AVG <= 11575 lb/d Jul
011Nitrogen, ammonia total [as N]30DA AVG <= 11394 lb/d May
011Nitrogen, ammonia total [as N]30DA AVG <= 10546 lb/d Apr
011Nitrogen, ammonia total [as N]DAILY MX <= 12392 lb/d Mar
011Nitrogen, ammonia total [as N]DAILY MX <= 10890 lb/d Sep
011Nitrogen, ammonia total [as N]DAILY MX <= 13832 lb/d Feb
011Nitrogen, ammonia total [as N]DAILY MX <= 11823 lb/d Aug
011Nitrogen, ammonia total [as N]DAILY MX <= 10145 lb/d Nov
011Nitrogen, ammonia total [as N]DAILY MX <= 10558 lb/d Oct
011Nitrogen, ammonia total [as N]DAILY MX <= 12696 lb/d Jan
011Nitrogen, ammonia total [as N]DAILY MX <= 10655 lb/d Dec
011Nitrogen, ammonia total [as N]DAILY MX <= 11114 lb/d Jun
011Nitrogen, ammonia total [as N]DAILY MX <= 12395 lb/d Jul
011Nitrogen, ammonia total [as N]DAILY MX <= 11394 lb/d May
011Nitrogen, ammonia total [as N]DAILY MX <= 10546 lb/d Apr
011Phosphorus, total [as P]30DA AVG report only all year
011Phosphorus, total [as P]DAILY MX report only all year
011Phosphorus, total [as P]30DA AVG report only all year
011Phosphorus, total [as P]DAILY MX report only all year
011E. coliGEO MEAN <= 126 #/100mL Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
011Toxicity [acute], Ceriodaphnia dubiaDAILY MX <= 1 N=0;Y=1 all year
011Toxicity [acute], Pimephales promelas [Fathead Minnow]DAILY MX <= 1 N=0;Y=1 all year
011BOD, carbonaceous [5 day, 20 C]30DA AVG <= 7256 lb/d all year
011BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 11609 lb/d all year
SUMStreamflow30DA AVG report only all year
SUMStreamflowDAILY MX report only all year
SUMBOD, 5-day, 20 deg. C30DA AVG report only all year
SUMBOD, 5-day, 20 deg. CDAILY MX report only all year
SUMBOD, 5-day, 20 deg. C30DA AVG report only all year
SUMBOD, 5-day, 20 deg. CDAILY MX report only all year
SUMBOD, 5-day, 20 deg. C30DA AVG report only all year
SUMBOD, 5-day, 20 deg. CDAILY MX report only all year
SUMBOD, 5-day, 20 deg. C30DA AVG report only all year
SUMBOD, 5-day, 20 deg. CDAILY MX report only all year
SUMpHDAILY MN >= 6 SU all year
SUMpHDAILY MX <= 9 SU all year
SUMSolids, total suspended30DA AVG <= 8707 lb/d all year
SUMSolids, total suspended7 DA AVG <= 13060 lb/d all year
SUMSolids, total suspended30DA AVG report only all year
SUMSolids, total suspendedDAILY MX report only all year
SUMSolids, total suspended30DA AVG report only all year
SUMSolids, total suspendedDAILY MX report only all year
SUMNitrogen, total [as N]30DA AVG <= 9285.5 lb/d all year
SUMNitrogen, total [as N]DAILY MX <= 15199 lb/d all year
SUMNitrogen, total [as N]30DA AVG report only all year
SUMNitrogen, total [as N]DAILY MX report only all year
SUMNitrogen, total [as N]30DA AVG report only all year
SUMNitrogen, total [as N]DAILY MX report only all year
SUMNitrogen, ammonia total [as N]30DA AVG <= 18 mg/L May
SUMNitrogen, ammonia total [as N]30DA AVG <= 13 mg/L Aug
SUMNitrogen, ammonia total [as N]30DA AVG <= 14.2 mg/L Jul
SUMNitrogen, ammonia total [as N]30DA AVG <= 70 mg/L Feb
SUMNitrogen, ammonia total [as N]30DA AVG <= 21.5 mg/L Apr
SUMNitrogen, ammonia total [as N]30DA AVG <= 30.7 mg/L Mar
SUMNitrogen, ammonia total [as N]30DA AVG <= 45.8 mg/L Dec
SUMNitrogen, ammonia total [as N]30DA AVG <= 30.8 mg/L Oct
SUMNitrogen, ammonia total [as N]30DA AVG <= 38.7 mg/L Nov
SUMNitrogen, ammonia total [as N]30DA AVG <= 11.6 mg/L Jun
SUMNitrogen, ammonia total [as N]30DA AVG <= 55.9 mg/L Jan
SUMNitrogen, ammonia total [as N]30DA AVG <= 13.4 mg/L Sep
SUMNitrogen, ammonia total [as N]DAILY MX <= 79.1 mg/L May
SUMNitrogen, ammonia total [as N]DAILY MX <= 74.1 mg/L Aug
SUMNitrogen, ammonia total [as N]DAILY MX <= 87.4 mg/L Jul
SUMNitrogen, ammonia total [as N]DAILY MX <= 116.5 mg/L Feb
SUMNitrogen, ammonia total [as N]DAILY MX <= 79.8 mg/L Apr
SUMNitrogen, ammonia total [as N]DAILY MX <= 108.5 mg/L Mar
SUMNitrogen, ammonia total [as N]DAILY MX <= 72.7 mg/L Dec
SUMNitrogen, ammonia total [as N]DAILY MX <= 93.5 mg/L Oct
SUMNitrogen, ammonia total [as N]DAILY MX <= 78.4 mg/L Nov
SUMNitrogen, ammonia total [as N]DAILY MX <= 78.1 mg/L Jun
SUMNitrogen, ammonia total [as N]DAILY MX <= 95 mg/L Jan
SUMNitrogen, ammonia total [as N]DAILY MX <= 94.6 mg/L Sep
SUMNitrogen, ammonia total [as N]30DA AVG <= 2962.7 lb/d May
SUMNitrogen, ammonia total [as N]30DA AVG <= 2082.2 lb/d Aug
SUMNitrogen, ammonia total [as N]30DA AVG <= 2283.2 lb/d Jul
SUMNitrogen, ammonia total [as N]30DA AVG <= 11372 lb/d Feb
SUMNitrogen, ammonia total [as N]30DA AVG <= 3519 lb/d Apr
SUMNitrogen, ammonia total [as N]30DA AVG <= 4998.7 lb/d Mar
SUMNitrogen, ammonia total [as N]30DA AVG <= 8998 lb/d Dec
SUMNitrogen, ammonia total [as N]30DA AVG <= 5020.2 lb/d Oct
SUMNitrogen, ammonia total [as N]30DA AVG <= 6282.3 lb/d Nov
SUMNitrogen, ammonia total [as N]30DA AVG <= 1931.6 lb/d Jun
SUMNitrogen, ammonia total [as N]30DA AVG <= 9364 lb/d Jan
SUMNitrogen, ammonia total [as N]30DA AVG <= 2221.8 lb/d Sep
SUMNitrogen, ammonia total [as N]DAILY MX <= 14162.8 lb/d May
SUMNitrogen, ammonia total [as N]DAILY MX <= 13652.6 lb/d Aug
SUMNitrogen, ammonia total [as N]DAILY MX <= 25229 lb/d Jul
SUMNitrogen, ammonia total [as N]DAILY MX <= 19558 lb/d Feb
SUMNitrogen, ammonia total [as N]DAILY MX <= 14363 lb/d Apr
SUMNitrogen, ammonia total [as N]DAILY MX <= 21421 lb/d Mar
SUMNitrogen, ammonia total [as N]DAILY MX <= 13467 lb/d Dec
SUMNitrogen, ammonia total [as N]DAILY MX <= 16990 lb/d Oct
SUMNitrogen, ammonia total [as N]DAILY MX <= 13970.8 lb/d Nov
SUMNitrogen, ammonia total [as N]DAILY MX <= 13877.8 lb/d Jun
SUMNitrogen, ammonia total [as N]DAILY MX <= 16561 lb/d Jan
SUMNitrogen, ammonia total [as N]DAILY MX <= 16916 lb/d Sep
SUMNitrogen, Kjeldahl, total [as N]30DA AVG report only all year
SUMNitrogen, Kjeldahl, total [as N]DAILY MX report only all year
SUMNitrogen, Kjeldahl, total [as N]30DA AVG report only all year
SUMNitrogen, Kjeldahl, total [as N]DAILY MX report only all year
SUMPhosphorus, total [as P]30DA AVG report only all year
SUMPhosphorus, total [as P]DAILY MX report only all year
SUMPhosphorus, total [as P]30DA AVG report only all year
SUMPhosphorus, total [as P]DAILY MX report only all year
SUMPhosphorus, total [as P]30DA AVG report only all year
SUMPhosphorus, total [as P]DAILY MX report only all year
SUMPhosphorus, total [as P]30DA AVG report only all year
SUMPhosphorus, total [as P]DAILY MX report only all year
SUME. coliGEO MEAN <= 126 #/100mL Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
SUMToxicity [acute], Ceriodaphnia dubiaDAILY MX <= 1 N=0;Y=1 all year
SUMToxicity [acute], Pimephales promelas [Fathead Minnow]DAILY MX <= 1 N=0;Y=1 all year
SUMBOD, carbonaceous [5 day, 20 C]30DA AVG <= 7256 lb/d all year
SUMBOD, carbonaceous [5 day, 20 C]7 DA AVG <= 11609 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