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Salem WWTP

Sewage treatment plant, major discharger, Salem, Indiana. NPDES permit IN0021644, in force until Jul 31, 2028. Last 12 months: over a limit 11 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (26 values), form AQ quarterly (8 values)
Renewal application due
Feb 2, 2028 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
21 values over a limit, 0 required values missing, 0 of 20 reports late

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

Period endingParameterReportedLimitOver by
November 2025Nitrogen, ammonia total [as N], maximum weekly average2.7767 mg/L≤ 2.1 mg/L32%
November 2025Nitrogen, ammonia total [as N], maximum weekly average33.188 lb/d≤ 28 lb/d19%
December 2025Solids, total suspended, maximum weekly average18.65 mg/L≤ 15 mg/L24%
January 2026Nitrogen, ammonia total [as N], monthly average3.2285 mg/L≤ 2.8 mg/L15%
January 2026Nitrogen, ammonia total [as N], maximum weekly average100.75 lb/d≤ 56.1 lb/d80%
January 2026Nitrogen, ammonia total [as N], maximum weekly average11.467 mg/L≤ 4.2 mg/L173%
March 2026Nitrogen, ammonia total [as N], maximum weekly average90.231 lb/d≤ 56.1 lb/d61%
April 2026Nitrogen, ammonia total [as N], maximum weekly average5.28 mg/L≤ 4.2 mg/L26%
May 2026Solids, total suspended, monthly average140.18 lb/d≤ 133.5 lb/d5%
June 2026Nitrogen, ammonia total [as N], maximum weekly average4.1 mg/L≤ 2.1 mg/L95%
June 2026Nitrogen, ammonia total [as N], maximum weekly average43.706 lb/d≤ 28 lb/d56%

Limits in force (67)

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≤ 10 mg/Lall year001
Solids, total suspendedmaximum weekly average≤ 15 mg/Lall year001
Solids, total suspendedmonthly average≤ 133.5 lb/dall year001
Solids, total suspendedmaximum weekly average≤ 200.3 lb/dall year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, total [as N]monthly averagereport only (lb/d)all year001
Nitrogen, ammonia total [as N]monthly average≤ 1.4 mg/LMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 2.8 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]maximum weekly average≤ 2.1 mg/LMay–Nov001
Nitrogen, ammonia total [as N]maximum weekly average≤ 4.2 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 18.7 lb/dMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 37.4 lb/dJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]maximum weekly average≤ 28 lb/dMay–Nov001
Nitrogen, ammonia total [as N]maximum weekly average≤ 56.1 lb/dJan, Feb, Mar, Apr, Dec001
Phosphorus, total [as P]monthly average≤ 1 mg/Lall year001
Phosphorus, total [as P]monthly averagereport only (lb/d)all year001
Hardness, total [as CaCO3]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Hardness, total [as CaCO3]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Chloride [as Cl]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Chloride [as Cl]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Chloride [as Cl]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Chloride [as Cl]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Sulfate, total [as SO4]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Sulfate, total [as SO4]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Chlorine, total residualmonthly average< .06 mg/LJan, Feb, Mar, Nov, Dec001
Chlorine, total residualdaily maximum< .06 mg/LJan, Feb, Mar, Nov, Dec001
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
E. coli, colony forming units [CFU]daily maximumreport only (CFU/100mL)Apr–Oct001
Number of Eventsmonthly totalreport only (# exceed)Apr–Oct001
Number of Eventsmonthly totalreport only (#)Apr–Oct001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteJul001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteAug001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteAug001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1.02 tox chronicJul001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1.02 tox chronicAug001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1.02 tox chronicAug001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteJul001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteAug001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteAug001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1.02 tox chronicJul001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1.02 tox chronicAug001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1.02 tox chronicAug001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 15 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 133.5 lb/dall year001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 200.3 lb/dall year001
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/IN0021644 · MCP: https://passage-data.com/mcp