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Plymouth Energy, LLC

Industrial Organic Chemicals, Merrill, Iowa. NPDES permit IA0081248, in force until Dec 31, 2026. Last 12 months: over a limit 28 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (18 values)
Renewal application due
Jul 4, 2026 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 1 of 12 reports late

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

All 28 values over a limit
Period endingParameterReportedLimitOver by
January 2026Chlorine, total residual, 30-day average.174827≤ .012 mg/L1357%
January 2026Chlorine, total residual, 30-day average.266362≤ .026 lb/d924%
January 2026Chlorine, total residual, daily maximum.21≤ .019 mg/L1005%
January 2026Chlorine, total residual, daily maximum.322257≤ .042 lb/d667%
February 2026Chlorine, total residual, 30-day average.179642≤ .012 mg/L1397%
February 2026Chlorine, total residual, 30-day average.274954≤ .026 lb/d958%
February 2026Chlorine, total residual, daily maximum.21≤ .019 mg/L1005%
February 2026Chlorine, total residual, daily maximum.322257≤ .042 lb/d667%
March 2026Chlorine, total residual, 30-day average.189354≤ .012 mg/L1478%
March 2026Chlorine, total residual, 30-day average.270199≤ .026 lb/d939%
March 2026Chlorine, total residual, daily maximum.23≤ .019 mg/L1111%
March 2026Chlorine, total residual, daily maximum.335685≤ .042 lb/d699%
April 2026Chlorine, total residual, 30-day average.149≤ .012 mg/L1142%
April 2026Chlorine, total residual, 30-day average.209189≤ .026 lb/d705%
April 2026Chlorine, total residual, daily maximum.19≤ .019 mg/L900%
April 2026Chlorine, total residual, daily maximum.270966≤ .042 lb/d545%
May 2026Chlorine, total residual, 30-day average.145806≤ .012 mg/L1115%
May 2026Chlorine, total residual, 30-day average.227784≤ .026 lb/d776%
May 2026Chlorine, total residual, daily maximum.2≤ .019 mg/L953%
May 2026Chlorine, total residual, daily maximum.310248≤ .042 lb/d639%
June 2026Chlorine, total residual, 30-day average.1225≤ .012 mg/L921%
June 2026Chlorine, total residual, 30-day average.195531≤ .026 lb/d652%
June 2026Chlorine, total residual, daily maximum.14≤ .019 mg/L637%
June 2026Chlorine, total residual, daily maximum.221844≤ .042 lb/d428%
July 2026Chlorine, total residual, 30-day average.051838≤ .012 mg/L332%
July 2026Chlorine, total residual, 30-day average.083252≤ .026 lb/d220%
July 2026Chlorine, total residual, daily maximum.14≤ .019 mg/L637%
July 2026Chlorine, total residual, daily maximum.225346≤ .042 lb/d437%

Limits in force (18)

ParameterStatisticLimitMonths
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspendeddaily maximum≤ 45 mg/Lall year
Solids, total suspended30-day average≤ 49.66 lb/dall year
Solids, total suspendeddaily maximum≤ 74.5 lb/dall year
Sulfate, total [as SO4]30-day average≤ 1516 mg/Lall year
Sulfate, total [as SO4]daily maximum≤ 1516 mg/Lall year
Sulfate, total [as SO4]30-day average≤ 3350 lb/dall year
Sulfate, total [as SO4]daily maximum≤ 3350 lb/dall year
Iron, total [as Fe]30-day average≤ 1.001 mg/Lall year
Iron, total [as Fe]daily maximum≤ 1.001 mg/Lall year
Iron, total [as Fe]30-day average≤ 2.21 lb/dall year
Iron, total [as Fe]daily maximum≤ 2.21 lb/dall year
Chlorine, total residual30-day average≤ .012 mg/Lall year
Chlorine, total residualdaily maximum≤ .019 mg/Lall year
Chlorine, total residual30-day average≤ .026 lb/dall year
Chlorine, total residualdaily maximum≤ .042 lb/dall year

How strict are these limits?

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

Same industry: the 57 Chemicals and Allied Products permits in Iowa.

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Your permit document is the final word. As JSON: /api/v1/permits/IA0081248 · MCP: https://passage-data.com/mcp