WATERLOO WWTP

NPDES permit IN0020711 · Minor POTW · effective, expires 2027-02-28 · 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

8values over a limit
2required values missing, on 1 form(s)
2of 24 forms filed late

Last period with anything received: 2026-08-31. Most often over: Nitrogen, ammonia total [as N] (5), E. coli, colony forming units [CFU] (2), Solids, total suspended (1).

Reporting

Reports are due about 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (41)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]DLYAVMIN >= 5 mg/L all year
001pHDAILY MN >= 6 SU all year
001pHDAILY MX <= 9 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L Jan, Feb, Mar, Apr, Dec
001Solids, total suspendedMO AVG <= 18 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001Solids, total suspendedMX WK AV <= 45 mg/L Jan, Feb, Mar, Apr, Dec
001Solids, total suspendedMX WK AV <= 27 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001Solids, total suspendedMO AVG <= 92.4 lb/d Jan, Feb, Mar, Apr, Dec
001Solids, total suspendedMO AVG <= 55.4 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
001Solids, total suspendedMX WK AV <= 138.6 lb/d Jan, Feb, Mar, Apr, Dec
001Solids, total suspendedMX WK AV <= 83.1 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
001Nitrogen, ammonia total [as N]MO AVG <= 2.36 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001Nitrogen, ammonia total [as N]MO AVG <= 2.41 mg/L Jan, Feb, Mar, Apr, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 5.49 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 5.61 mg/L Jan, Feb, Mar, Apr, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 7.27 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
001Nitrogen, ammonia total [as N]MO AVG <= 7.42 lb/d Jan, Feb, Mar, Apr, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 16.91 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 17.27 lb/d Jan, Feb, Mar, Apr, Dec
001Phosphorus, total [as P]MO AVG <= 1 mg/L all year
001Phosphorus, total [as P]MO AVG report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001E. coli, colony forming units [CFU]MO GEO <= 125 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001E. coli, colony forming units [CFU]DAILY MX <= 235 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001E. coli, colony forming units [CFU]DAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
001Number of EventsMO TOTAL report only Apr, May, Jun, Jul, Aug, Sep, Oct
001Number of EventsMO TOTAL report only Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L Jan, Feb, Mar, Apr, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 15 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001BOD, carbonaceous [5 day, 20 C]MX WK AV <= 40 mg/L Jan, Feb, Mar, Apr, Dec
001BOD, carbonaceous [5 day, 20 C]MX WK AV <= 23 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 77 lb/d Jan, Feb, Mar, Apr, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 46.2 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
001BOD, carbonaceous [5 day, 20 C]MX WK AV <= 123.2 lb/d Jan, Feb, Mar, Apr, Dec
001BOD, carbonaceous [5 day, 20 C]MX WK AV <= 70.8 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
001Phosphorus, total percent removalMO AV MN >= 75 % all year
001Flow, totalMO TOTAL report only all year
101DurationMO TOTAL report only all year
101Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
101Precipitation, monthly accumulationMO TOTAL report only all year
101Discharge event observation [Visual Monitoring]MO TOTAL report only 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