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City of Spring Hill

Sewage treatment plant, major discharger, Spring Hill, Tennessee. NPDES permit TN0075868, in force until Dec 31, 2028. Last 12 months: over a limit 2 times (last January 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form G monthly (37 values), outfall 002 form G monthly (6 values), outfall INF1 form G monthly (6 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
20 values over a limit, 0 required values missing, 0 of 36 reports late

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

Period endingParameterReportedLimitOver by
October 2025Solids, settleable, daily maximum7 mL/L≤ 1 mL/L600%
January 2026SSO, Wet Weather, monthly total1 occur/mo≤ 0 occur/mo—

Limits in force (59)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 7 mg/Lall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 40 mg/Lall year001
Solids, total suspendeddaily maximum≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 1251 lb/dall year001
Solids, total suspendedweekly average≤ 1668 lb/dall year001
Solids, settleabledaily maximum≤ 1 mL/Lall year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, total [as N]monthly averagereport only (lb/d)all year001
Nitrogen, total [as N]rolling average≤ 51750 lb/yrall year001
Nitrogen, ammonia total [as N]monthly average≤ 1.1 mg/LMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 2.1 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 1.65 mg/LMay–Oct001
Nitrogen, ammonia total [as N]weekly average≤ 3.2 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 2.2 mg/LMay–Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 4.2 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 45.9 lb/dMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 87.6 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 68.8 lb/dMay–Oct001
Nitrogen, ammonia total [as N]weekly average≤ 133.4 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (lb/d)all year001
Phosphorus, total [as P]rolling average≤ 21309 lb/yrall 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
E. colimonthly geometric mean≤ 126 #/100mLall year001
E. colidaily maximum≤ 941 #/100mLall year001
SSO, Dry Weathermonthly total≤ 0 occur/moall year001
SSO, Wet Weathermonthly total≤ 0 occur/moall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 3 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 6 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 4.5 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 9 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 6 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 12 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 125 lb/dMay–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 250 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 188 lb/dMay–Oct001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 375 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous, percent removaldaily minimum≥ 40 %all year001
BOD, carbonaceous, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removaldaily minimum≥ 40 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum≥ 98 %all year001
IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasminimum≥ 98 %all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
E. colimonthly average≤ 23 #/100mLall year002
E. colidaily maximum≤ 126 #/100mLall year002
E. colimonthly average≤ 23 #/100mLall year002
E. colidaily maximum≤ 126 #/100mLall year002
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF1
Solids, total suspendeddaily maximumreport only (mg/L)all yearINF1
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearINF1
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearINF1
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearINF1
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all yearINF1

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/TN0075868 · MCP: https://passage-data.com/mcp