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Arrowhead MHC LLC

Sewerage Systems, Swanton, Ohio. NPDES permit OH0122149, in force until Jul 31, 2028. Last 12 months: over a limit 6 times (last June 2026), 1 of 13 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: form A monthly (30 values)
Renewal application due
Feb 2, 2028 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
16 values over a limit, 0 required values missing, 1 of 14 reports late

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

Period endingParameterReportedLimitOver by
April 2026Oxygen, dissolved [DO], daily minimum1.7≥ 6 mg/L72%
May 2026Nitrogen, ammonia total [as N], monthly average1.32≤ 1 mg/L32%
May 2026Nitrogen, ammonia total [as N], weekly maximum2.01≤ 1.5 mg/L34%
May 2026Oxygen, dissolved [DO], daily minimum4.8≥ 6 mg/L20%
June 2026BOD, carbonaceous [5 day, 20 C], weekly maximum25.6≤ 15 mg/L71%
June 2026Oxygen, dissolved [DO], daily minimum4.3≥ 6 mg/L28%

Limits in force (38)

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≥ 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≤ 2.46 kg/dall year001
Solids, total suspendedweekly maximum≤ 3.68 kg/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 1 mg/LMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 4 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≤ 6 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ .2 kg/dMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ .82 kg/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]weekly maximum≤ .31 kg/dMay–Oct001
Nitrogen, ammonia total [as N]weekly maximum≤ 1.23 kg/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Jan, Mar, May, Jul, Sep, Nov001
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)Jan, Mar, May, Jul, Sep, Nov001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Turbidity [severity]monthly averagereport only (severity)all year001
Turbidity [severity]daily maximumreport only (severity)all year001
E. coli, MTEC-MFmonthly geometric mean≤ 126 MPN/100mLMay–Oct001
E. coli, MTEC-MFweekly geometric mean≤ 284 MPN/100mLMay–Oct001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualdaily maximum≤ .019 mg/LMay–Oct001
Solids, total dissolved- 180 deg. Cmonthly averagereport only (mg/L)Sep001
Solids, total dissolved- 180 deg. Cdaily maximumreport only (mg/L)Sep001
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≤ 2 kg/dall year001
BOD, carbonaceous [5 day, 20 C]weekly maximum≤ 3.1 kg/dall year001
Biosolids weight indluding admixturesmonthly averagereport only (dry ton)Dec586
Biosolids weight indluding admixturesdaily maximumreport only (dry ton)Dec586
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/OH0122149 · MCP: https://passage-data.com/mcp