Passage Data · Check a report · Use it from your AI

Mahaska Rural Water Systems, Inc

Sewage treatment plant, Rose Hill, Iowa. NPDES permit IA0072311, in force until Feb 28, 2027. Last 12 months: over a limit 2 times (last May 2026), 10 required values missing, 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (11 values)
Renewal application due
Sep 1, 2026 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 2 of 12 reports late

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

Period endingParameterReportedLimitOver by
May 2026Nitrogen, ammonia total [as N], 30-day average3.05≤ 1.9 mg/L61%
May 2026Nitrogen, ammonia total [as N], 30-day average4.349727≤ 2.7 lb/d61%

Limits in force (55)

ParameterStatisticLimitMonths
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 80 mg/Lall year
Solids, total suspended7-day average≤ 120 mg/Lall year
Nitrogen, ammonia total [as N]30-day average≤ 3.5 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 5.9 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 1.9 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 5.2 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 2.9 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 2.1 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 1.4 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 4.6 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 6.9 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 14.6 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 6.9 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 6 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 8.5 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 7.3 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 7.1 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 12.2 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 6.9 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 7.1 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 7.2 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 10.1 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 4.9 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 8.4 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 2.2 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 1.5 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 5.7 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 1.6 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 2.7 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 7.4 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 4.1 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 3.1 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 2 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 6.6 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 9.8 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 20.8 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 9.8 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 8.6 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 10.4 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 10.2 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 17.5 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 9.8 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 10.1 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 10.3 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 14.3 lb/dMar
E. coli30-day averagereport only (#/100mL)all year
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

New limits from Feb 1, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
E. coli, geometric mean142 #/100mL (Mar–Nov)new——
Nitrogen, ammonia total [as N], 30-day average4 mg/L (Feb)tighter——
Nitrogen, ammonia total [as N], 30-day average5.7 lb/d (Feb)tighter——
Nitrogen, ammonia total [as N], 30-day average1.5 mg/L (Apr)tighter——
Nitrogen, ammonia total [as N], 30-day average2.2 lb/d (Apr)tighter——
Nitrogen, ammonia total [as N], 30-day average1.3 mg/L (Jun)tighter——
Nitrogen, ammonia total [as N], 30-day average1.9 lb/d (Jun)tighter——
Nitrogen, ammonia total [as N], 30-day average1.6 mg/L (Oct)tighter——
Nitrogen, ammonia total [as N], 30-day average2.2 lb/d (Oct)tighter——
Nitrogen, ammonia total [as N], 30-day average4.9 lb/d (Jan)tighter——
Nitrogen, ammonia total [as N], 30-day average3.4 mg/L (Jan)tighter——
Nitrogen, ammonia total [as N], 30-day average1 mg/L (Jul)tighter——
Nitrogen, ammonia total [as N], 30-day average1.5 lb/d (Jul)tighter——
Nitrogen, ammonia total [as N], 30-day average2.5 lb/d (May)tighter——
Nitrogen, ammonia total [as N], 30-day average1.8 mg/L (May)tighter——
Nitrogen, ammonia total [as N], 30-day average3.4 mg/L (Mar)tighter——
Nitrogen, ammonia total [as N], 30-day average4.9 lb/d (Mar)tighter——
Nitrogen, ammonia total [as N], 30-day average1.4 lb/d (Aug)tighter——
Nitrogen, ammonia total [as N], 30-day average1.1 mg/L (Sep)tighter——
Nitrogen, ammonia total [as N], 30-day average1.5 lb/d (Sep)tighter——
Nitrogen, ammonia total [as N], 30-day average2.3 mg/L (Nov)tighter——
Nitrogen, ammonia total [as N], 30-day average3.3 lb/d (Nov)tighter——
Nitrogen, ammonia total [as N], 30-day average3.5 lb/d (Dec)tighter——
Nitrogen, ammonia total [as N], 30-day average2.5 mg/L (Dec)tighter——
Nitrogen, ammonia total [as N], daily maximum8.4 mg/L (Feb)tighter——
Nitrogen, ammonia total [as N], daily maximum12 lb/d (Feb)tighter——
Nitrogen, ammonia total [as N], daily maximum6.8 lb/d (Apr)tighter——
Nitrogen, ammonia total [as N], daily maximum4.7 mg/L (Apr)tighter——
Nitrogen, ammonia total [as N], daily maximum3.2 mg/L (Jun)tighter——
Nitrogen, ammonia total [as N], daily maximum4.6 lb/d (Jun)tighter——
Nitrogen, ammonia total [as N], daily maximum2.7 mg/L (Oct)tighter——
Nitrogen, ammonia total [as N], daily maximum3.8 lb/d (Oct)tighter——
Nitrogen, ammonia total [as N], daily maximum4.6 lb/d (Jul)tighter——
Nitrogen, ammonia total [as N], daily maximum3.2 mg/L (Jul)tighter——
Nitrogen, ammonia total [as N], daily maximum4.6 lb/d (May)tighter——
Nitrogen, ammonia total [as N], daily maximum3.2 mg/L (May)tighter——
Nitrogen, ammonia total [as N], daily maximum5.6 lb/d (Mar)tighter——
Nitrogen, ammonia total [as N], daily maximum3.9 mg/L (Mar)tighter——
Nitrogen, ammonia total [as N], daily maximum2.7 mg/L (Aug)tighter——
Nitrogen, ammonia total [as N], daily maximum3.8 lb/d (Aug)tighter——
Nitrogen, ammonia total [as N], daily maximum2.7 mg/L (Sep)tighter——
Nitrogen, ammonia total [as N], daily maximum3.8 lb/d (Sep)tighter——
Nitrogen, ammonia total [as N], daily maximum3.8 lb/d (Nov)tighter——
Nitrogen, ammonia total [as N], daily maximum2.7 mg/L (Nov)tighter——
Nitrogen, ammonia total [as N], daily maximum3.9 mg/L (Dec)tighter——
Nitrogen, ammonia total [as N], daily maximum5.6 lb/d (Dec)tighter——

How strict are these limits?

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

Check this month's numbers Email me before each report is due

· Save this facility as a site · Superfund sites nearby · Your permits on one board

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IA0072311 · MCP: https://passage-data.com/mcp