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Lynn WWTP

Sewage treatment plant, Lynn, Indiana. NPDES permit IN0040967, in force until Aug 31, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (19 values), form TX twice a year
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 14 reports late

Limits in force (50)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily average minimum≥ 6 mg/LMay–Nov001
Oxygen, dissolved [DO]daily average minimum≥ 5 mg/LJan, Feb, Mar, Apr, Dec001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmonthly average≤ 24 mg/LMay–Nov001
Solids, total suspendedmaximum weekly average≤ 45 mg/LJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmaximum weekly average≤ 36 mg/LMay–Nov001
Solids, total suspendedmonthly average≤ 62.6 lb/dJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmonthly average≤ 50.1 lb/dMay–Nov001
Solids, total suspendedmaximum weekly average≤ 93.9 lb/dJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmaximum weekly average≤ 75.1 lb/dMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 1.8 mg/LMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 2.7 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]maximum weekly average≤ 2.7 mg/LMay–Nov001
Nitrogen, ammonia total [as N]maximum weekly average≤ 4.1 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 3.8 lb/dMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 5.6 lb/dJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]maximum weekly average≤ 5.6 lb/dMay–Nov001
Nitrogen, ammonia total [as N]maximum weekly average≤ 8.6 lb/dJan, Feb, Mar, Apr, Dec001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
E. coli, colony forming units [CFU]monthly geometric mean≤ 125 CFU/100mLApr–Oct001
E. coli, colony forming units [CFU]daily maximum≤ 235 CFU/100mLApr–Oct001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteMar, Sep001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1.2 tox chronicMar, Sep001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteMar, Sep001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1.2 tox chronicMar, Sep001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 20 mg/LMay–Nov001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/LJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 30 mg/LMay–Nov001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 52.2 lb/dJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 41.7 lb/dMay–Nov001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 83.5 lb/dJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 62.6 lb/dMay–Nov001
Flow, totalmonthly totalreport only (Mgal/mo)all year001
Copper, dry weightvaluereport only (mg/kg)Jun, DecPRT
Copper, dry weightvaluereport only (mg/kg)Jun, DecPRT
Cadmium, dry weightvaluereport only (mg/kg)Jun, DecPRT
Cadmium, dry weightvaluereport only (mg/kg)Jun, DecPRT
Molybdenum, sludge, total, dry weight [as Mo]valuereport only (mg/kg)Jun, DecPRT
Molybdenum, sludge, total, dry weight [as Mo]valuereport only (mg/kg)Jun, DecPRT
Zinc, sludge, total, dry weight [as Zn]valuereport only (mg/kg)Jun, DecPRT
Zinc, sludge, total, dry weight [as Zn]valuereport only (mg/kg)Jun, DecPRT
Lead, sludge, total, dry weight [as Pb]valuereport only (mg/kg)Jun, DecPRT
Lead, sludge, total, dry weight [as Pb]valuereport only (mg/kg)Jun, DecPRT
Nickel, sludge, total, dry weight [as Ni]valuereport only (mg/kg)Jun, DecPRT
Nickel, sludge, total, dry weight [as Ni]valuereport only (mg/kg)Jun, DecPRT
Mercury, sludge, total, dry weight [as Hg]valuereport only (mg/kg)Jun, DecPRT
Mercury, sludge, total, dry weight [as Hg]valuereport only (mg/kg)Jun, DecPRT

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IN0040967 · MCP: https://passage-data.com/mcp