FCA US LLC, Chelsea Proving Grounds

NPDES permit MI0046540 · Minor NON-POTW · effective, expires 2027-10-01 · 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

8values over a limit
0required values missing, on 0 form(s)
4of 22 forms filed late

Last period with anything received: 2026-07-31. Most often over: Solids, total dissolved (8).

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 (46)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]DAILY MN report only all year
001pHDAILY MN >= 6.5 SU all year
001pHDAILY MX <= 9 SU all year
001Solids, total suspendedMO AVG <= 20 mg/L all year
001Solids, total suspendedDAILY MX <= 30 mg/L all year
001Oil & GreaseDAILY MX <= 15 mg/L all year
001Phosphorus, total [as P]MO AVG <= .3 mg/L May, Jun, Jul, Aug, Sep
001Phosphorus, total [as P]MO AVG <= .45 mg/L Apr
001Phosphorus, total [as P]MO AVG <= 1 mg/L Jan, Feb, Mar, Oct, Nov, Dec
001Phosphorus, total [as P]DAILY MX report only May, Jun, Jul, Aug, Sep
001Phosphorus, total [as P]DAILY MX report only Apr
001Phosphorus, total [as P]DAILY MX report only Jan, Feb, Mar, Oct, Nov, Dec
001Phosphorus, total [as P]MO AVG <= .33 lb/d May, Jun, Jul, Aug, Sep
001Phosphorus, total [as P]MO AVG <= .49 lb/d Apr
001Phosphorus, total [as P]MO AVG <= 1.1 lb/d Jan, Feb, Mar, Oct, Nov, Dec
001Phosphorus, total [as P]DAILY MX report only May, Jun, Jul, Aug, Sep
001Phosphorus, total [as P]DAILY MX report only Apr
001Phosphorus, total [as P]DAILY MX report only Jan, Feb, Mar, Oct, Nov, Dec
001Chloride [as Cl]DAILY MX report only all year
001Sulfate, total [as SO4]DAILY MX report only all year
001Oxidants, total residualDAILY MX <= 38 ug/L all year
001Oxidants, total residualINST MAX <= 300 ug/L all year
001Oxidants, total residualDAILY MX <= 200 ug/L all year
001Oxidants, total residualINST MAX <= 50 ug/L 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
001Solids, total dissolvedMO MAX <= 1900 mg/L Oct, Nov
001Solids, total dissolvedMO MAX <= 1800 mg/L May, Jun, Jul, Aug, Sep
001Solids, total dissolvedMO MAX <= 2400 mg/L Jan, Feb, Mar, Dec
001Solids, total dissolvedMO MAX <= 4500 mg/L Apr
001Solids, total dissolvedDAILY MX <= 4600 mg/L Oct, Nov
001Solids, total dissolvedDAILY MX <= 4400 mg/L May, Jun, Jul, Aug, Sep
001Solids, total dissolvedDAILY MX <= 6000 mg/L Jan, Feb, Mar, Dec
001Solids, total dissolvedDAILY MX <= 12000 mg/L Apr
001Solids, total dissolvedMO AVG <= 2100 lb/d Oct, Nov
001Solids, total dissolvedMO AVG <= 2000 lb/d May, Jun, Jul, Aug, Sep
001Solids, total dissolvedMO AVG <= 2600 lb/d Jan, Feb, Mar, Dec
001Solids, total dissolvedMO MAX <= 4900 lb/d Apr
001Solids, total dissolvedDAILY MX <= 5000 lb/d Oct, Nov
001Solids, total dissolvedDAILY MX <= 4800 lb/d May, Jun, Jul, Aug, Sep
001Solids, total dissolvedDAILY MX <= 6500 lb/d Jan, Feb, Mar, Dec
001Solids, total dissolvedDAILY MX <= 13000 lb/d Apr
001Chlorination durationDAILY MX report only all year
001Chlorination durationDAILY MX <= 160 min/d all year
001Outfall observation,visual, y/n responseVALUE report only all year
002Outfall observation,visual, y/n responseVALUE 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