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FCA US LLC, Chelsea Proving Grounds

Testing Laboratories, Chelsea, Michigan. NPDES permit MI0046540, in force until Oct 1, 2027. Last 12 months: over a limit 8 times (last May 2026), 6 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: outfall 001 form A monthly (25 values), outfall 002 form A monthly (1 value)
Renewal application due
Apr 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
13 values over a limit, 0 required values missing, 2 of 24 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
January 2026Solids, total dissolved, monthly maximum2600≤ 2400 mg/L8%
February 2026Solids, total dissolved, monthly average3752≤ 2600 lb/d44%
February 2026Solids, total dissolved, monthly maximum3050≤ 2400 mg/L27%
March 2026Solids, total dissolved, monthly average2718≤ 2600 lb/d5%
March 2026Solids, total dissolved, monthly maximum3200≤ 2400 mg/L33%
May 2026Solids, total dissolved, daily maximum8213≤ 4800 lb/d71%
May 2026Solids, total dissolved, monthly average6570≤ 2000 lb/d229%
May 2026Solids, total dissolved, monthly maximum1850≤ 1800 mg/L3%

Limits in force (46)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimumreport only (mg/L)all year001
pHdaily minimum≥ 6.5 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 20 mg/Lall year001
Solids, total suspendeddaily maximum≤ 30 mg/Lall year001
Oil & Greasedaily maximum≤ 15 mg/Lall year001
Phosphorus, total [as P]monthly average≤ .3 mg/LMay–Sep001
Phosphorus, total [as P]monthly average≤ .45 mg/LApr001
Phosphorus, total [as P]monthly average≤ 1 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Phosphorus, total [as P]daily maximumreport only (mg/L)May–Sep001
Phosphorus, total [as P]daily maximumreport only (mg/L)Apr001
Phosphorus, total [as P]daily maximumreport only (mg/L)Jan, Feb, Mar, Oct, Nov, Dec001
Phosphorus, total [as P]monthly average≤ .33 lb/dMay–Sep001
Phosphorus, total [as P]monthly average≤ .49 lb/dApr001
Phosphorus, total [as P]monthly average≤ 1.1 lb/dJan, Feb, Mar, Oct, Nov, Dec001
Phosphorus, total [as P]daily maximumreport only (lb/d)May–Sep001
Phosphorus, total [as P]daily maximumreport only (lb/d)Apr001
Phosphorus, total [as P]daily maximumreport only (lb/d)Jan, Feb, Mar, Oct, Nov, Dec001
Chloride [as Cl]daily maximumreport only (mg/L)all year001
Sulfate, total [as SO4]daily maximumreport only (mg/L)all year001
Oxidants, total residualdaily maximum≤ 38 ug/Lall year001
Oxidants, total residualinstantaneous maximum≤ 300 ug/Lall year001
Oxidants, total residualdaily maximum≤ 200 ug/Lall year001
Oxidants, total residualinstantaneous maximum≤ 50 ug/Lall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Solids, total dissolvedmonthly maximum≤ 1900 mg/LOct, Nov001
Solids, total dissolvedmonthly maximum≤ 1800 mg/LMay–Sep001
Solids, total dissolvedmonthly maximum≤ 2400 mg/LJan, Feb, Mar, Dec001
Solids, total dissolvedmonthly maximum≤ 4500 mg/LApr001
Solids, total dissolveddaily maximum≤ 4600 mg/LOct, Nov001
Solids, total dissolveddaily maximum≤ 4400 mg/LMay–Sep001
Solids, total dissolveddaily maximum≤ 6000 mg/LJan, Feb, Mar, Dec001
Solids, total dissolveddaily maximum≤ 12000 mg/LApr001
Solids, total dissolvedmonthly average≤ 2100 lb/dOct, Nov001
Solids, total dissolvedmonthly average≤ 2000 lb/dMay–Sep001
Solids, total dissolvedmonthly average≤ 2600 lb/dJan, Feb, Mar, Dec001
Solids, total dissolvedmonthly maximum≤ 4900 lb/dApr001
Solids, total dissolveddaily maximum≤ 5000 lb/dOct, Nov001
Solids, total dissolveddaily maximum≤ 4800 lb/dMay–Sep001
Solids, total dissolveddaily maximum≤ 6500 lb/dJan, Feb, Mar, Dec001
Solids, total dissolveddaily maximum≤ 13000 lb/dApr001
Chlorination durationdaily maximumreport only (min/d)all year001
Chlorination durationdaily maximum≤ 160 min/dall year001
Outfall observation,visual, y/n responsevaluereport only (N=0;Y=1)all year001
Outfall observation,visual, y/n responsevaluereport only (N=0;Y=1)all year002

How strict are these limits?

Cited limits by parameter: Michigan's rules and the federal ones.

Same industry: the 4 Engineering, Accounting, Research and Management Services permits in Michigan.

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Your permit document is the final word. As JSON: /api/v1/permits/MI0046540 · MCP: https://passage-data.com/mcp