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Prairie Farms Dairy

Cheese, Natural And Processed, Monona, Iowa. NPDES permit IA0003808, in force until May 31, 2030. Last 12 months: over a limit 35 times (last August 2026), 3 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (44 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
29 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 35 values over a limit
Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], 30-day average17.3199≤ 9 lb/d92%
October 2025Nitrogen, ammonia total [as N], 30-day average3.925444≤ 1.6 mg/L145%
November 2025Nitrogen, ammonia total [as N], 30-day average15.92643≤ 13.4 lb/d19%
November 2025Nitrogen, ammonia total [as N], 30-day average3.41175≤ 2.3 mg/L48%
December 2025Nitrogen, ammonia total [as N], 30-day average32.27244≤ 14.2 lb/d127%
December 2025Nitrogen, ammonia total [as N], 30-day average6.624444≤ 2.5 mg/L165%
January 2026Chloride [as Cl], 30-day average427.5555≤ 389 mg/L10%
January 2026Chloride [as Cl], daily maximum696≤ 629 mg/L11%
January 2026Nitrogen, ammonia total [as N], 30-day average4.215555≤ 3.4 mg/L24%
February 2026Nitrogen, ammonia total [as N], 30-day average25.00335≤ 22.7 lb/d10%
February 2026Nitrogen, ammonia total [as N], 30-day average5.42375≤ 4 mg/L36%
March 2026Nitrogen, ammonia total [as N], 30-day average22.21228≤ 19.6 lb/d13%
March 2026Nitrogen, ammonia total [as N], 30-day average5.14≤ 3.4 mg/L51%
April 2026Nitrogen, ammonia total [as N], 30-day average19.66335≤ 8.8 lb/d123%
April 2026Nitrogen, ammonia total [as N], 30-day average4.34625≤ 1.5 mg/L190%
May 2026Chloride [as Cl], 30-day average419.3333≤ 389 mg/L8%
May 2026Chloride [as Cl], daily maximum648≤ 629 mg/L3%
May 2026Nitrogen, ammonia total [as N], 30-day average20.23666≤ 10 lb/d102%
May 2026Nitrogen, ammonia total [as N], 30-day average4.458888≤ 1.7 mg/L162%
June 2026Chloride [as Cl], daily maximum635≤ 629 mg/L1%
June 2026Nitrogen, ammonia total [as N], 30-day average18.82883≤ 7.5 lb/d151%
June 2026Nitrogen, ammonia total [as N], 30-day average3.853333≤ 1.3 mg/L196%
June 2026Nitrogen, ammonia total [as N], daily maximum47.79628≤ 25.3 lb/d89%
June 2026Nitrogen, ammonia total [as N], daily maximum9.73≤ 4.4 mg/L121%
July 2026Chloride [as Cl], 30-day average394.7777≤ 389 mg/L1%
July 2026Nitrogen, ammonia total [as N], 30-day average18.34659≤ 5.8 lb/d216%
July 2026Nitrogen, ammonia total [as N], 30-day average3.768555≤ 1 mg/L277%
July 2026Nitrogen, ammonia total [as N], daily maximum34.10125≤ 19 lb/d79%
July 2026Nitrogen, ammonia total [as N], daily maximum6.48≤ 3.3 mg/L96%
August 2026BOD, 5-day, 20 deg. C, 30-day average126.0218≤ 126 lb/d0%
August 2026Chloride [as Cl], 30-day average421.6666≤ 389 mg/L8%
August 2026Nitrogen, ammonia total [as N], 30-day average13.16026≤ 5.5 lb/d139%
August 2026Nitrogen, ammonia total [as N], 30-day average2.616666≤ 1 mg/L162%
August 2026Nitrogen, ammonia total [as N], daily maximum21.44839≤ 20.7 lb/d4%
August 2026Nitrogen, ammonia total [as N], daily maximum4.05≤ 3.6 mg/L13%

Limits in force (110)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheit30-day average≤ 70.9 deg FJan
Temperature, water deg. fahrenheit30-day average≤ 87.4 deg FMar
Temperature, water deg. fahrenheit30-day average≤ 89.6 deg FJun
Temperature, water deg. fahrenheit30-day average≤ 89.6 deg FAug
Temperature, water deg. fahrenheit30-day average≤ 84.9 deg FMay
Temperature, water deg. fahrenheit30-day average≤ 80.6 deg FNov
Temperature, water deg. fahrenheit30-day average≤ 89.6 deg FOct
Temperature, water deg. fahrenheit30-day average≤ 80.4 deg FFeb
Temperature, water deg. fahrenheit30-day average≤ 89.6 deg FJul
Temperature, water deg. fahrenheit30-day average≤ 71.6 deg FDec
Temperature, water deg. fahrenheit30-day average≤ 89.6 deg FSep
Temperature, water deg. fahrenheit30-day average≤ 82.4 deg FApr
Temperature, water deg. fahrenheitdaily maximum≤ 89.6 deg FJan
Temperature, water deg. fahrenheitdaily maximum≤ 89.6 deg FMar
Temperature, water deg. fahrenheitdaily maximum≤ 89.6 deg FJun
Temperature, water deg. fahrenheitdaily maximum≤ 89.6 deg FAug
Temperature, water deg. fahrenheitdaily maximum≤ 89.6 deg FMay
Temperature, water deg. fahrenheitdaily maximum≤ 89.6 deg FNov
Temperature, water deg. fahrenheitdaily maximum≤ 89.6 deg FOct
Temperature, water deg. fahrenheitdaily maximum≤ 89.6 deg FFeb
Temperature, water deg. fahrenheitdaily maximum≤ 89.6 deg FJul
Temperature, water deg. fahrenheitdaily maximum≤ 89.6 deg FDec
Temperature, water deg. fahrenheitdaily maximum≤ 89.6 deg FSep
Temperature, water deg. fahrenheitdaily maximum≤ 89.6 deg FApr
Oxygen, dissolved [DO]daily minimum≥ 5 mg/Lall year
BOD, 5-day, 20 deg. C30-day average≤ 126 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 297.9 lb/dall year
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≥ 6.5 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≤ 184.3 lb/dall year
Solids, total suspendeddaily maximum≤ 433.1 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≤ 1.6 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 2.3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 1.7 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 8.8 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 10.5 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 10.1 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 9.6 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 8.9 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 4.4 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 6.4 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 3.6 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 6.3 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 11.9 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 8.8 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 3.3 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 9 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 19.6 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 14.2 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 22.7 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 13.4 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 7.5 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 10 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 5.5 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 6.1 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 19.6 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 8.8 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 5.8 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 50.6 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 60.4 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 58.1 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 55.2 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 51.2 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 25.3 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 36.8 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 20.7 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 36.3 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 68.5 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 50.6 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 19 lb/dJul
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
Chloride [as Cl]30-day average≤ 389 mg/Lall year
Chloride [as Cl]daily maximum≤ 629 mg/Lall year
Chloride [as Cl]30-day average≤ 2237 lb/dall year
Chloride [as Cl]daily maximum≤ 3619 lb/dall year
Chlorine, total residual30-day average≤ .008 mg/Lall year
Chlorine, total residualdaily maximum≤ .019 mg/Lall year
Chlorine, total residual30-day average≤ .045 lb/dall year
Chlorine, total residualdaily maximum≤ .11 lb/dall year
E. coligeometric mean≤ 147 #/100mLall year

New limits from May 1, 2030

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Aluminum, total [as Al], 30-day average7.27 lb/dnew——
Aluminum, total [as Al], 30-day average0.89 mg/Lnew——
Aluminum, total [as Al], daily maximum2.5 mg/Lnew——
Aluminum, total [as Al], daily maximum20.4 lb/dnew——

How strict are these limits?

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

Same industry: the 48 Food and Kindred Products permits in Iowa.

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On EPA ECHO: Facility report · DMR history

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