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City of Rock Valley

Sewage treatment plant, Rock Valley, Iowa. NPDES permit IA0033057, in force until Sep 30, 2027. Last 12 months: over a limit 7 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (37 values)
Renewal application due
Apr 3, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
7 values over a limit, 0 required values missing, 1 of 12 reports late

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

Period endingParameterReportedLimitOver by
June 2026BOD, carbonaceous [5 day, 20 C], 30-day average702.2191≤ 157 lb/d347%
June 2026BOD, carbonaceous [5 day, 20 C], 7-day average3130.627≤ 251 lb/d1147%
June 2026Nitrogen, ammonia total [as N], 30-day average175.4013≤ 15.5 lb/d1032%
June 2026Nitrogen, ammonia total [as N], daily maximum1563.75≤ 125 lb/d1151%
June 2026Solids, total suspended, 30-day average2627.156≤ 188 lb/d1297%
June 2026Solids, total suspended, 7-day average11728.9≤ 283 lb/d4044%
September 2026Solids, total suspended, 7-day average51.3≤ 45 mg/L14%

Limits in force (81)

ParameterStatisticLimitMonths
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year
BOD, 5-day, 20 deg. C30-day averagereport only (lb/d)all year
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all year
pHdaily minimum≥ 6.2 SUall year
pHdaily maximum≤ 9 SUall year
pH30-day averagereport only (SU)all year
pHdaily maximumreport only (SU)all year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspended30-day average≤ 188 lb/dall year
Solids, total suspended7-day average≤ 283 lb/dall year
Solids, total suspended30-day averagereport only (mg/L)all year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, total suspended30-day averagereport only (lb/d)all year
Solids, total suspendeddaily maximumreport only (lb/d)all year
Nitrogen, total [as N]30-day averagereport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]30-day averagereport only (lb/d)all year
Nitrogen, total [as N]daily maximumreport only (lb/d)all year
Nitrogen, ammonia total [as N]30-day average≤ 6.3 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 7.7 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 4.5 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 3.9 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 3 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 4.8 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 7.2 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 10.6 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 12.2 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 2.6 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 25.7 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 17.9 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 24.6 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 24.3 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 23.8 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 21.5 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 24.3 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 23 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 26.5 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 19 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 27.2 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 23 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 36.2 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 15.8 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 44 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 26.4 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 22.6 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 17.5 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 27.7 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 41.4 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 60.8 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 14.4 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 69.9 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 15.5 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 152.7 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 94.8 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 148.1 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 146 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 142.9 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 114.3 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 146.1 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 138.1 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 157.3 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 100.5 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 160 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 125 lb/dJun
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (lb/d)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (lb/d)all year
Phosphorus, total [as P]30-day averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]30-day averagereport only (lb/d)all year
Phosphorus, total [as P]daily maximumreport only (lb/d)all year
E. coligeometric mean≤ 126 #/100mLMar–Nov
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/Lall year
BOD, carbonaceous [5 day, 20 C]30-day average≤ 157 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 251 lb/dall year

How strict are these limits?

Cited limits by parameter: Iowa'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/IA0033057 · MCP: https://passage-data.com/mcp