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Clarkson STP

Sewage treatment plant, Clarkson, Kentucky. NPDES permit KY0090590 expired Aug 31, 2025; its limits still apply. Last 12 months: over a limit 76 times (last August 2026), 6 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form 1 monthly (35 values), form 4 yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
67 values over a limit, 0 required values missing, 5 of 13 reports late

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

All 76 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, carbonaceous [5 day, 20 C], monthly average25 lb/d≤ 9.3825 lb/d166%
October 2025BOD, carbonaceous [5 day, 20 C], maximum weekly average68 lb/d≤ 14.07 lb/d383%
October 2025Solids, suspended percent removal, monthly average minimum75 %≥ 85 %67%
October 2025Solids, total suspended, monthly average49 lb/d≤ 11.259 lb/d335%
October 2025Solids, total suspended, maximum weekly average128 lb/d≤ 16.88 lb/d658%
November 2025BOD, carbonaceous [5 day, 20 C], monthly average34 lb/d≤ 9.3825 lb/d262%
November 2025BOD, carbonaceous [5 day, 20 C], maximum weekly average83 lb/d≤ 14.07 lb/d490%
November 2025Nitrogen, ammonia total [as N], monthly average10.03 lb/d≤ 3.8 lb/d164%
November 2025Nitrogen, ammonia total [as N], maximum weekly average25.13 lb/d≤ 5.7 lb/d341%
November 2025Solids, total suspended, monthly average58 lb/d≤ 11.259 lb/d415%
November 2025Solids, total suspended, maximum weekly average159 lb/d≤ 16.88 lb/d842%
December 2025BOD, carbonaceous [5 day, 20 C], monthly average10 lb/d≤ 9.3825 lb/d7%
December 2025BOD, carbonaceous [5 day, 20 C], maximum weekly average18 lb/d≤ 14.07 lb/d28%
January 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average18 lb/d≤ 14.07 lb/d28%
January 2026E. coli, 30-day geometric mean234 #/100mL≤ 130 #/100mL80%
January 2026E. coli, 7-day geometric mean60000 #/100mL≤ 240 #/100mL24900%
January 2026Nitrogen, ammonia total [as N], daily maximum26.2 mg/L≤ 15 mg/L75%
January 2026Nitrogen, ammonia total [as N], monthly average15.28 lb/d≤ 3.8 lb/d302%
January 2026Nitrogen, ammonia total [as N], monthly average20.08 mg/L≤ 10 mg/L101%
January 2026Nitrogen, ammonia total [as N], maximum weekly average21.13 lb/d≤ 5.7 lb/d271%
January 2026pH, maximum9.08 SU≤ 9 SU—
February 2026BOD, carbonaceous [5 day, 20 C], monthly average51 lb/d≤ 9.3825 lb/d444%
February 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average132 lb/d≤ 14.07 lb/d838%
February 2026E. coli, 30-day geometric mean1538 #/100mL≤ 130 #/100mL1083%
February 2026E. coli, 7-day geometric mean60000 #/100mL≤ 240 #/100mL24900%
February 2026Nitrogen, ammonia total [as N], daily maximum19.3 mg/L≤ 15 mg/L29%
February 2026Nitrogen, ammonia total [as N], monthly average14.1 mg/L≤ 10 mg/L41%
February 2026Nitrogen, ammonia total [as N], monthly average83.4 lb/d≤ 3.8 lb/d2095%
February 2026Nitrogen, ammonia total [as N], maximum weekly average189.5 lb/d≤ 5.7 lb/d3225%
February 2026Solids, total suspended, monthly average41 lb/d≤ 11.259 lb/d264%
February 2026Solids, total suspended, maximum weekly average77 lb/d≤ 16.88 lb/d356%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average44 lb/d≤ 9.3825 lb/d369%
March 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average102 lb/d≤ 14.07 lb/d625%
March 2026E. coli, 7-day geometric mean614 #/100mL≤ 240 #/100mL156%
March 2026Nitrogen, ammonia total [as N], daily maximum17.1 mg/L≤ 15 mg/L14%
March 2026Nitrogen, ammonia total [as N], monthly average13.18 mg/L≤ 10 mg/L32%
March 2026Nitrogen, ammonia total [as N], monthly average53.9 lb/d≤ 3.8 lb/d1318%
March 2026Nitrogen, ammonia total [as N], maximum weekly average101 lb/d≤ 5.7 lb/d1672%
March 2026Solids, suspended percent removal, monthly average minimum83 %≥ 85 %13%
March 2026Solids, total suspended, monthly average99 lb/d≤ 11.259 lb/d779%
March 2026Solids, total suspended, maximum weekly average287 lb/d≤ 16.88 lb/d1600%
April 2026BOD, carbonaceous [5 day, 20 C], monthly average44 lb/d≤ 9.3825 lb/d369%
April 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average102 lb/d≤ 14.07 lb/d625%
April 2026E. coli, 7-day geometric mean614 #/100mL≤ 240 #/100mL156%
April 2026Nitrogen, ammonia total [as N], daily maximum17.1 mg/L≤ 15 mg/L14%
April 2026Nitrogen, ammonia total [as N], monthly average13.18 mg/L≤ 10 mg/L32%
April 2026Nitrogen, ammonia total [as N], monthly average54 lb/d≤ 3.8 lb/d1321%
April 2026Nitrogen, ammonia total [as N], maximum weekly average101 lb/d≤ 5.7 lb/d1672%
April 2026Solids, suspended percent removal, monthly average minimum83 %≥ 85 %13%
April 2026Solids, total suspended, monthly average99 lb/d≤ 11.259 lb/d779%
April 2026Solids, total suspended, maximum weekly average287 lb/d≤ 16.88 lb/d1600%
May 2026BOD, carbonaceous [5 day, 20 C], monthly average19 lb/d≤ 9.3825 lb/d103%
May 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average56 lb/d≤ 14.07 lb/d298%
May 2026E. coli, 7-day geometric mean329 #/100mL≤ 240 #/100mL37%
May 2026Nitrogen, ammonia total [as N], monthly average3.55 lb/d≤ 1.5 lb/d137%
May 2026Nitrogen, ammonia total [as N], maximum weekly average8.51 lb/d≤ 2.25 lb/d278%
May 2026Oxygen, dissolved [DO], instantaneous minimum6.13 mg/L≥ 7 mg/L12%
May 2026Solids, suspended percent removal, monthly average minimum58 %≥ 85 %180%
May 2026Solids, total suspended, monthly average33 lb/d≤ 11.259 lb/d193%
May 2026Solids, total suspended, monthly average40 mg/L≤ 30 mg/L33%
May 2026Solids, total suspended, maximum weekly average70 mg/L≤ 45 mg/L56%
May 2026Solids, total suspended, maximum weekly average85 lb/d≤ 16.88 lb/d404%
June 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average16 lb/d≤ 14.07 lb/d14%
June 2026Nitrogen, ammonia total [as N], monthly average1.6 lb/d≤ 1.5 lb/d7%
June 2026Oxygen, dissolved [DO], instantaneous minimum5.54 mg/L≥ 7 mg/L21%
June 2026Solids, suspended percent removal, monthly average minimum70 %≥ 85 %100%
June 2026Solids, total suspended, monthly average20 lb/d≤ 11.259 lb/d78%
June 2026Solids, total suspended, maximum weekly average32 lb/d≤ 16.88 lb/d90%
July 2026Oxygen, dissolved [DO], instantaneous minimum5.92 mg/L≥ 7 mg/L15%
July 2026pH, maximum9.32 SU≤ 9 SU—
August 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average30 lb/d≤ 14.07 lb/d113%
August 2026Nitrogen, ammonia total [as N], maximum weekly average3.67 lb/d≤ 2.25 lb/d63%
August 2026Oxygen, dissolved [DO], instantaneous minimum5.6 mg/L≥ 7 mg/L20%
August 2026Solids, total suspended, monthly average22 lb/d≤ 11.259 lb/d95%
August 2026Solids, total suspended, maximum weekly average76 lb/d≤ 16.88 lb/d350%
August 2026pH, maximum9.42 SU≤ 9 SU—

Limits in force (43)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitaveragereport only (deg F)May–Oct
Temperature, water deg. fahrenheitaveragereport only (deg F)Jan, Feb, Mar, Apr, Nov, Dec
Temperature, water deg. fahrenheitmaximumreport only (deg F)May–Oct
Temperature, water deg. fahrenheitmaximumreport only (deg F)Jan, Feb, Mar, Apr, Nov, Dec
Oxygen, dissolved [DO]instantaneous minimum≥ 7 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 11.259 lb/dall year
Solids, total suspendedmaximum weekly average≤ 16.88 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmaximum weekly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 10 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 6 mg/LMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 15 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 1.5 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 3.8 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ 2.25 lb/dMay–Oct
Nitrogen, ammonia total [as N]maximum weekly average≤ 5.7 lb/dJan, Feb, Mar, Apr, Nov, Dec
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
E. coli30-day geometric mean≤ 130 #/100mLall year
E. coli7-day geometric mean≤ 240 #/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 37.5 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 9.3825 lb/dall year
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 14.07 lb/dall year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]maximum weekly averagereport only (mg/L)all year
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year

How strict are these limits?

Cited limits by parameter: Kentucky'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/KY0090590 · MCP: https://passage-data.com/mcp