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Knollwood Subdivision Wastewater Treatment Plant

Sewerage Systems, Circleville, Ohio. NPDES permit OH0151699, in force until Nov 30, 2029. Last 12 months: over a limit 15 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (23 values), outfall 300 form A monthly (2 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 3 of 21 reports late

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

All 15 values over a limit
Period endingParameterReportedLimitOver by
March 2026Solids, total suspended, monthly average58≤ 12 mg/L383%
March 2026Solids, total suspended, weekly maximum58≤ 18 mg/L222%
April 2026E. coli, MTEC-MF, weekly geometric mean2419.6≤ 284 MPN/100mL752%
April 2026Solids, total suspended, monthly average10.7≤ 2.2 kg/d386%
April 2026Solids, total suspended, monthly average36.8≤ 12 mg/L207%
April 2026Solids, total suspended, weekly maximum10.7≤ 3.3 kg/d224%
April 2026Solids, total suspended, weekly maximum36.8≤ 18 mg/L104%
May 2026Solids, total suspended, monthly average24≤ 12 mg/L100%
May 2026Solids, total suspended, monthly average3≤ 2.2 kg/d36%
May 2026Solids, total suspended, weekly maximum24≤ 18 mg/L33%
June 2026Solids, total suspended, monthly average24≤ 12 mg/L100%
June 2026Solids, total suspended, weekly maximum24≤ 18 mg/L33%
August 2026E. coli, MTEC-MF, weekly geometric mean325.5≤ 284 MPN/100mL15%
September 2026Solids, total suspended, monthly average23≤ 12 mg/L92%
September 2026Solids, total suspended, weekly maximum23≤ 18 mg/L28%

Limits in force (33)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademonthly averagereport only (deg C)all year001
Temperature, water deg. centigradedaily maximumreport only (deg C)all year001
Oxygen, dissolved [DO]daily minimum≥ 6 mg/Lall year001
pHdaily minimum≥ 6.5 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 12 mg/Lall year001
Solids, total suspendedweekly maximum≤ 18 mg/Lall year001
Solids, total suspendedmonthly average≤ 2.2 kg/dall year001
Solids, total suspendedweekly maximum≤ 3.3 kg/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 1 mg/LMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 3 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]weekly maximum≤ 1.5 mg/LMay–Oct001
Nitrogen, ammonia total [as N]weekly maximum≤ 4.5 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ .19 kg/dMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ .56 kg/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]weekly maximum≤ .28 kg/dMay–Oct001
Nitrogen, ammonia total [as N]weekly maximum≤ .83 kg/dJan, Feb, Mar, Apr, Nov, Dec001
Turbidity [severity]monthly averagereport only (severity)all year001
Turbidity [severity]daily maximumreport only (severity)all year001
E. coli, MTEC-MFmonthly geometric mean≤ 126 MPN/100mLall year001
E. coli, MTEC-MFweekly geometric mean≤ 284 MPN/100mLall 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
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly maximum≤ 15 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 1.9 kg/dall year001
BOD, carbonaceous [5 day, 20 C]weekly maximum≤ 2.8 kg/dall year001
Overflowsmonthly averagereport only (occur/mo)all year300
Overflowsdaily maximumreport only (occur/mo)all year300
Biosolids weight indluding admixturesmonthly averagereport only (dry ton)Oct586
Biosolids weight indluding admixturesdaily maximumreport only (dry ton)Oct586
Sludge waste from secondary clarifiersmonthly averagereport only (gal)Dec588
Sludge waste from secondary clarifiersdaily maximumreport only (gal)Dec588

How strict are these limits?

Cited limits by parameter: Ohio'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/OH0151699 · MCP: https://passage-data.com/mcp