ISABELLA RESERVATION WWTP

NPDES permit MI0054861 · Minor POTW · administratively continued, expires 2023-05-07 · EPA's file as of 2026-09-19

Check this month's numbers before you file

This permit expired on 2023-05-07 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

2values over a limit
239required values missing, on 8 form(s)
0of 14 forms filed late

Last period with anything received: 2025-12-31. Most often over: Mercury, total [as Hg] (2).

Reporting

Reports are due about 21 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (178)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]DAILY MN >= 6 mg/L Oct, Nov
001Oxygen, dissolved [DO]DAILY MN >= 6 mg/L Oct, Nov
001Oxygen, dissolved [DO]DAILY MN > 5 mg/L Jan, Feb, Mar, Dec
001Oxygen, dissolved [DO]DAILY MN > 5 mg/L Jan, Feb, Mar, Dec
001Oxygen, dissolved [DO]DAILY MN >= 4 mg/L Apr
001Oxygen, dissolved [DO]DAILY MN >= 4 mg/L Apr
001Oxygen, dissolved [DO]DAILY MN >= 6 mg/L May, Jun, Jul, Aug, Sep
001Oxygen, dissolved [DO]DAILY MN >= 6 mg/L May, Jun, Jul, Aug, Sep
001BOD, 5-day, 20 deg. CMO AVG report only all year
001BOD, 5-day, 20 deg. CMO AVG report only all year
001BOD, 5-day, 20 deg. CMO AVG report only all year
001BOD, 5-day, 20 deg. CMO AVG report only all year
001BOD, 5-day, 20 deg. C7 DA AVG report only all year
001BOD, 5-day, 20 deg. C7 DA AVG report only all year
001BOD, 5-day, 20 deg. C7 DA AVG report only all year
001BOD, 5-day, 20 deg. C7 DA AVG report only all year
001BOD, 5-day, 20 deg. CMO AVG report only all year
001BOD, 5-day, 20 deg. CMO AVG report only all year
001BOD, 5-day, 20 deg. C7 DA AVG report only all year
001BOD, 5-day, 20 deg. C7 DA AVG report only all year
001pHDAILY MN >= 6.5 SU all year
001pHDAILY MN >= 6.5 SU all year
001pHDAILY MX <= 9 SU all year
001pHDAILY MX <= 9 SU all year
001pHDAILY MN report only all year
001pHDAILY MN report only all year
001pHDAILY MX report only all year
001pHDAILY MX report only all year
001Solids, total suspendedMO AVG <= 20 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001Solids, total suspendedMO AVG <= 20 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001Solids, total suspendedMO AVG <= 30 mg/L Jan, Feb, Mar, Apr, Dec
001Solids, total suspendedMO AVG <= 30 mg/L Jan, Feb, Mar, Apr, Dec
001Solids, total suspended7 DA AVG <= 30 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001Solids, total suspended7 DA AVG <= 30 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001Solids, total suspended7 DA AVG <= 45 mg/L Jan, Feb, Mar, Apr, Dec
001Solids, total suspended7 DA AVG <= 45 mg/L Jan, Feb, Mar, Apr, Dec
001Solids, total suspendedMO AVG <= 97 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
001Solids, total suspendedMO AVG <= 97 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
001Solids, total suspendedMO AVG <= 145 lb/d Jan, Feb, Mar, Apr, Dec
001Solids, total suspendedMO AVG <= 145 lb/d Jan, Feb, Mar, Apr, Dec
001Solids, total suspended7 DA AVG <= 145 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
001Solids, total suspended7 DA AVG <= 145 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
001Solids, total suspended7 DA AVG <= 218 lb/d Jan, Feb, Mar, Apr, Dec
001Solids, total suspended7 DA AVG <= 218 lb/d Jan, Feb, Mar, Apr, Dec
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspended7 DA AVG report only all year
001Solids, total suspended7 DA AVG report only all year
001Solids, total suspended7 DA AVG report only all year
001Solids, total suspended7 DA AVG report only all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspended7 DA AVG report only all year
001Solids, total suspended7 DA AVG report only all year
001Nitrogen, ammonia total [as N]MO AVG <= 2.2 mg/L May, Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]MO AVG <= 2.2 mg/L May, Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]MO AVG report only Jan, Feb, Mar, Dec
001Nitrogen, ammonia total [as N]MO AVG report only Jan, Feb, Mar, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 20.8 mg/L Jan, Feb, Mar, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 20.8 mg/L Jan, Feb, Mar, Dec
001Nitrogen, ammonia total [as N]MO AVG <= .5 mg/L May, Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]MO AVG <= .5 mg/L May, Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 6 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 6 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 2 mg/L Oct, Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 2 mg/L Oct, Nov
001Nitrogen, ammonia total [as N]7 DA AVG <= 2 mg/L May, Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]7 DA AVG <= 2 mg/L May, Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]MO AVG <= 11 lb/d May, Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]MO AVG <= 11 lb/d May, Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]MO AVG <= 101 lb/d Jan, Feb, Mar, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 101 lb/d Jan, Feb, Mar, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 2.4 lb/d May, Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]MO AVG <= 2.4 lb/d May, Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]7 DA AVG <= 29 lb/d Apr
001Nitrogen, ammonia total [as N]7 DA AVG <= 29 lb/d Apr
001Nitrogen, ammonia total [as N]7 DA AVG <= 10 lb/d Oct, Nov
001Nitrogen, ammonia total [as N]7 DA AVG <= 10 lb/d Oct, Nov
001Nitrogen, ammonia total [as N]7 DA AVG <= 10 lb/d May, Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]7 DA AVG <= 10 lb/d May, Jun, Jul, Aug, Sep
001Phosphorus, total [as P]MO AVG <= 1 mg/L all year
001Phosphorus, total [as P]MO AVG <= 1 mg/L all year
001Phosphorus, total [as P]MO AVG <= 1 mg/L all year
001Phosphorus, total [as P]MO AVG <= 1 mg/L all year
001Phosphorus, total [as P]DAILY MX <= 1.7 mg/L all year
001Phosphorus, total [as P]DAILY MX <= 1.7 mg/L all year
001Phosphorus, total [as P]DAILY MX <= 1.5 mg/L all year
001Phosphorus, total [as P]DAILY MX <= 1.5 mg/L all year
001Phosphorus, total [as P]MO AVG <= 4.8 lb/d all year
001Phosphorus, total [as P]MO AVG <= 4.8 lb/d all year
001Phosphorus, total [as P]MO AVG <= 4.8 lb/d all year
001Phosphorus, total [as P]MO AVG <= 4.8 lb/d all year
001Phosphorus, total [as P]DAILY MX <= 7.2 lb/d all year
001Phosphorus, total [as P]DAILY MX <= 7.2 lb/d all year
001Phosphorus, total [as P]DAILY MX <= 7.2 lb/d all year
001Phosphorus, total [as P]DAILY MX <= 7.2 lb/d all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001E. coliGEO MEAN <= 126 #/100mL all year
001E. coliGEO MEAN <= 126 #/100mL all year
001E. coliDAILY MX <= 235 #/100mL all year
001E. coliDAILY MX <= 235 #/100mL all year
001Mercury, total [as Hg]MO AVG <= 3 ng/L all year
001Mercury, total [as Hg]MO AVG <= 3 ng/L all year
001Mercury, total [as Hg]DAILY MX report only all year
001Mercury, total [as Hg]DAILY MX report only all year
001Mercury, total [as Hg]MO AVG <= .000013 lb/d all year
001Mercury, total [as Hg]MO AVG <= .000013 lb/d all year
001Mercury, total [as Hg]MAXIMUM report only all year
001Mercury, total [as Hg]MAXIMUM report only all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 13 mg/L Apr
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 13 mg/L Apr
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 7 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 7 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L Jan, Feb, Mar, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L Jan, Feb, Mar, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 7 mg/L Oct, Nov
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 7 mg/L Oct, Nov
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 4 mg/L May, Jun, Jul, Aug, Sep
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 4 mg/L May, Jun, Jul, Aug, Sep
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 20 mg/L Apr
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 20 mg/L Apr
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 10 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 10 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 40 mg/L Jan, Feb, Mar, Dec
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 40 mg/L Jan, Feb, Mar, Dec
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 10 mg/L Oct, Nov
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 10 mg/L Oct, Nov
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 10 mg/L May, Jun, Jul, Aug, Sep
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 10 mg/L May, Jun, Jul, Aug, Sep
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 63 lb/d Apr
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 63 lb/d Apr
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 34 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 34 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 121 lb/d Jan, Feb, Mar, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 121 lb/d Jan, Feb, Mar, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 34 lb/d Oct, Nov
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 34 lb/d Oct, Nov
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 19 lb/d May, Jun, Jul, Aug, Sep
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 19 lb/d May, Jun, Jul, Aug, Sep
001BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 97 lb/d Apr
001BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 97 lb/d Apr
001BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 48 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
001BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 48 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 193 lb/d Jan, Feb, Mar, Dec
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 193 lb/d Jan, Feb, Mar, Dec
001BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 48 lb/d Oct, Nov
001BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 48 lb/d Oct, Nov
001BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 48 lb/d May, Jun, Jul, Aug, Sep
001BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 48 lb/d May, Jun, Jul, Aug, Sep
001BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
001BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
001BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
001BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
001BOD, carbonaceous [5 day, 20 C]7 DA AVG report only all year
001BOD, carbonaceous [5 day, 20 C]7 DA AVG report only all year
001BOD, carbonaceous [5 day, 20 C]7 DA AVG report only all year
001BOD, carbonaceous [5 day, 20 C]7 DA AVG report only all year
001BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
001BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
001BOD, carbonaceous [5 day, 20 C]7 DA AVG report only all year
001BOD, carbonaceous [5 day, 20 C]7 DA AVG report only all year
001BOD, carb-5 day, 20 deg C, percent removalMINIMUM > 85 % Jan, Feb, Mar, Dec
001BOD, carb-5 day, 20 deg C, percent removalMINIMUM > 85 % Jan, Feb, Mar, Dec
001Solids, suspended percent removalMINIMUM >= 85 % Jan, Feb, Mar, Apr, Dec
001Solids, suspended percent removalMINIMUM >= 85 % Jan, Feb, Mar, Apr, Dec
001Outfall observation,visual, y/n responseMO AVG report only all year
001Outfall observation,visual, y/n responseMO AVG 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