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City of Underwood

Sewage treatment plant, Underwood, Iowa. NPDES permit IA0036986, in force until Nov 30, 2029. Last 12 months: over a limit 25 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (26 values), outfall 003 form A monthly (15 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 2 of 20 reports late

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

All 25 values over a limit
Period endingParameterReportedLimitOver by
November 2025BOD, carbonaceous [5 day, 20 C], 30-day average35.975≤ 25 mg/L44%
November 2025BOD, carbonaceous [5 day, 20 C], 7-day average43.1≤ 40 mg/L8%
December 2025BOD, carbonaceous [5 day, 20 C], 30-day average32.322≤ 25 mg/L29%
January 2026BOD, carbonaceous [5 day, 20 C], 30-day average48.225≤ 25 mg/L93%
January 2026BOD, carbonaceous [5 day, 20 C], 7-day average55.4≤ 40 mg/L39%
February 2026BOD, carbonaceous [5 day, 20 C], 30-day average59.8≤ 25 mg/L139%
February 2026BOD, carbonaceous [5 day, 20 C], 7-day average71.7≤ 40 mg/L79%
March 2026BOD, carbonaceous [5 day, 20 C], 30-day average70.32≤ 25 mg/L181%
March 2026BOD, carbonaceous [5 day, 20 C], 7-day average78.5≤ 40 mg/L96%
April 2026BOD, carbonaceous [5 day, 20 C], 30-day average42.03207≤ 34 lb/d24%
April 2026BOD, carbonaceous [5 day, 20 C], 30-day average52.26≤ 25 mg/L109%
April 2026BOD, carbonaceous [5 day, 20 C], 7-day average55.02459≤ 55 lb/d0%
April 2026BOD, carbonaceous [5 day, 20 C], 7-day average61.8≤ 40 mg/L55%
April 2026E. coli, geometric mean2419.6≤ 630 #/100mL284%
May 2026BOD, carbonaceous [5 day, 20 C], 30-day average43.35≤ 25 mg/L73%
May 2026BOD, carbonaceous [5 day, 20 C], 7-day average50.5≤ 40 mg/L26%
May 2026Nitrogen, ammonia total [as N], 30-day average26.15≤ 24.7 mg/L6%
June 2026BOD, carbonaceous [5 day, 20 C], 30-day average45.975≤ 25 mg/L84%
June 2026Solids, total suspended, 30-day average128.75≤ 80 mg/L61%
June 2026pH, daily maximum9.3≤ 9 SU—
July 2026BOD, carbonaceous [5 day, 20 C], 30-day average35.73991≤ 34 lb/d5%
July 2026BOD, carbonaceous [5 day, 20 C], 30-day average39.8≤ 25 mg/L59%
July 2026BOD, carbonaceous [5 day, 20 C], 7-day average43.5≤ 40 mg/L9%
August 2026BOD, carbonaceous [5 day, 20 C], 30-day average33.425≤ 25 mg/L34%
August 2026E. coli, geometric mean7940.135≤ 630 #/100mL1160%

Limits in force (129)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year001
BOD, 5-day, 20 deg. C30-day averagereport only (lb/d)all year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
pH30-day averagereport only (SU)all year001
pHdaily maximumreport only (SU)all year001
Solids, total suspended30-day average≤ 80 mg/Lall year001
Solids, total suspended7-day average≤ 120 mg/Lall year001
Solids, total suspended30-day average≤ 109 lb/dall year001
Solids, total suspended7-day average≤ 164 lb/dall year001
Solids, total suspended30-day averagereport only (mg/L)all year001
Solids, total suspendeddaily maximumreport only (mg/L)all year001
Solids, total suspended30-day averagereport only (lb/d)all year001
Solids, total suspendeddaily maximumreport only (lb/d)all year001
Nitrogen, ammonia total [as N]30-day average≤ 42.4 mg/LOct001
Nitrogen, ammonia total [as N]30-day average≤ 29.5 mg/LApr001
Nitrogen, ammonia total [as N]30-day average≤ 73.9 mg/LMar001
Nitrogen, ammonia total [as N]30-day average≤ 18.3 mg/LSep001
Nitrogen, ammonia total [as N]30-day average≤ 19.6 mg/LJul001
Nitrogen, ammonia total [as N]30-day average≤ 53.2 mg/LNov001
Nitrogen, ammonia total [as N]30-day average≤ 96.9 mg/LFeb001
Nitrogen, ammonia total [as N]30-day average≤ 85.2 mg/LJan001
Nitrogen, ammonia total [as N]30-day average≤ 24.7 mg/LMay001
Nitrogen, ammonia total [as N]30-day average≤ 17.9 mg/LAug001
Nitrogen, ammonia total [as N]30-day average≤ 63.1 mg/LDec001
Nitrogen, ammonia total [as N]30-day average≤ 15.8 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum≤ 86.8 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 73 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 106.4 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 80.4 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 67.7 mg/LJul001
Nitrogen, ammonia total [as N]daily maximum≤ 71.2 mg/LNov001
Nitrogen, ammonia total [as N]daily maximum≤ 156.5 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 144.4 mg/LJan001
Nitrogen, ammonia total [as N]daily maximum≤ 71.6 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 63.4 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 87.9 mg/LDec001
Nitrogen, ammonia total [as N]daily maximum≤ 71.6 mg/LJun001
Nitrogen, ammonia total [as N]30-day average≤ 41.1 lb/dOct001
Nitrogen, ammonia total [as N]30-day average≤ 28.7 lb/dApr001
Nitrogen, ammonia total [as N]30-day average≤ 71.6 lb/dMar001
Nitrogen, ammonia total [as N]30-day average≤ 17.9 lb/dSep001
Nitrogen, ammonia total [as N]30-day average≤ 18.9 lb/dJul001
Nitrogen, ammonia total [as N]30-day average≤ 51.6 lb/dNov001
Nitrogen, ammonia total [as N]30-day average≤ 93.8 lb/dFeb001
Nitrogen, ammonia total [as N]30-day average≤ 82.5 lb/dJan001
Nitrogen, ammonia total [as N]30-day average≤ 24.1 lb/dMay001
Nitrogen, ammonia total [as N]30-day average≤ 17.3 lb/dAug001
Nitrogen, ammonia total [as N]30-day average≤ 61.2 lb/dDec001
Nitrogen, ammonia total [as N]30-day average≤ 15.5 lb/dJun001
Nitrogen, ammonia total [as N]daily maximum≤ 83.2 lb/dOct001
Nitrogen, ammonia total [as N]daily maximum≤ 70.8 lb/dApr001
Nitrogen, ammonia total [as N]daily maximum≤ 102.2 lb/dMar001
Nitrogen, ammonia total [as N]daily maximum≤ 74.8 lb/dSep001
Nitrogen, ammonia total [as N]daily maximum≤ 62.8 lb/dJul001
Nitrogen, ammonia total [as N]daily maximum≤ 68.3 lb/dNov001
Nitrogen, ammonia total [as N]daily maximum≤ 151.4 lb/dFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 145.1 lb/dJan001
Nitrogen, ammonia total [as N]daily maximum≤ 69 lb/dMay001
Nitrogen, ammonia total [as N]daily maximum≤ 60.9 lb/dAug001
Nitrogen, ammonia total [as N]daily maximum≤ 84.6 lb/dDec001
Nitrogen, ammonia total [as N]daily maximum≤ 69 lb/dJun001
E. coligeometric mean≤ 630 #/100mLMar–Nov001
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]30-day average≤ 34 lb/dall year001
BOD, carbonaceous [5 day, 20 C]7-day average≤ 55 lb/dall year001
Report due [yrmoda]daily maximum≤ 1 N=0;Y=1all year001
pHdaily minimum≥ 6 SUall year003
pHdaily maximum≤ 9 SUall year003
Solids, total suspended30-day average≤ 80 mg/Lall year003
Solids, total suspended7-day average≤ 120 mg/Lall year003
Solids, total suspended30-day average≤ 109 lb/dall year003
Solids, total suspended7-day average≤ 164 lb/dall year003
Nitrogen, ammonia total [as N]30-day average≤ 6.4 mg/LApr003
Nitrogen, ammonia total [as N]30-day average≤ 6.6 mg/LMar003
Nitrogen, ammonia total [as N]30-day average≤ 5.1 mg/LJul003
Nitrogen, ammonia total [as N]30-day average≤ 12.3 mg/LFeb003
Nitrogen, ammonia total [as N]30-day average≤ 6.1 mg/LDec003
Nitrogen, ammonia total [as N]30-day average≤ 4.4 mg/LNov003
Nitrogen, ammonia total [as N]30-day average≤ 4.2 mg/LAug003
Nitrogen, ammonia total [as N]30-day average≤ 23.2 mg/LJan003
Nitrogen, ammonia total [as N]30-day average≤ 4.9 mg/LSep003
Nitrogen, ammonia total [as N]30-day average≤ 5 mg/LJun003
Nitrogen, ammonia total [as N]30-day average≤ 5 mg/LMay003
Nitrogen, ammonia total [as N]30-day average≤ 4.9 mg/LOct003
Nitrogen, ammonia total [as N]daily maximum≤ 6.4 mg/LApr003
Nitrogen, ammonia total [as N]daily maximum≤ 6.6 mg/LMar003
Nitrogen, ammonia total [as N]daily maximum≤ 5.1 mg/LJul003
Nitrogen, ammonia total [as N]daily maximum≤ 12.3 mg/LFeb003
Nitrogen, ammonia total [as N]daily maximum≤ 6.1 mg/LDec003
Nitrogen, ammonia total [as N]daily maximum≤ 4.4 mg/LNov003
Nitrogen, ammonia total [as N]daily maximum≤ 4.2 mg/LAug003
Nitrogen, ammonia total [as N]daily maximum≤ 23.2 mg/LJan003
Nitrogen, ammonia total [as N]daily maximum≤ 4.9 mg/LSep003
Nitrogen, ammonia total [as N]daily maximum≤ 5 mg/LJun003
Nitrogen, ammonia total [as N]daily maximum≤ 5 mg/LMay003
Nitrogen, ammonia total [as N]daily maximum≤ 4.9 mg/LOct003
Nitrogen, ammonia total [as N]30-day average≤ 8.1 lb/dApr003
Nitrogen, ammonia total [as N]30-day average≤ 7.9 lb/dMar003
Nitrogen, ammonia total [as N]30-day average≤ 5.8 lb/dJul003
Nitrogen, ammonia total [as N]30-day average≤ 15.1 lb/dFeb003
Nitrogen, ammonia total [as N]30-day average≤ 7.4 lb/dDec003
Nitrogen, ammonia total [as N]30-day average≤ 5.3 lb/dNov003
Nitrogen, ammonia total [as N]30-day average≤ 5.1 lb/dAug003
Nitrogen, ammonia total [as N]30-day average≤ 25.9 lb/dJan003
Nitrogen, ammonia total [as N]30-day average≤ 5.7 lb/dSep003
Nitrogen, ammonia total [as N]30-day average≤ 5.3 lb/dJun003
Nitrogen, ammonia total [as N]30-day average≤ 6 lb/dMay003
Nitrogen, ammonia total [as N]30-day average≤ 5.7 lb/dOct003
Nitrogen, ammonia total [as N]daily maximum≤ 8.1 lb/dApr003
Nitrogen, ammonia total [as N]daily maximum≤ 7.9 lb/dMar003
Nitrogen, ammonia total [as N]daily maximum≤ 6.2 lb/dJul003
Nitrogen, ammonia total [as N]daily maximum≤ 15.1 lb/dFeb003
Nitrogen, ammonia total [as N]daily maximum≤ 7.4 lb/dDec003
Nitrogen, ammonia total [as N]daily maximum≤ 5.3 lb/dNov003
Nitrogen, ammonia total [as N]daily maximum≤ 5.1 lb/dAug003
Nitrogen, ammonia total [as N]daily maximum≤ 30.4 lb/dJan003
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 lb/dSep003
Nitrogen, ammonia total [as N]daily maximum≤ 6 lb/dJun003
Nitrogen, ammonia total [as N]daily maximum≤ 6 lb/dMay003
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 lb/dOct003
E. coligeometric mean≤ 630 #/100mLMar–Nov003
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/Lall year003
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/Lall year003
BOD, carbonaceous [5 day, 20 C]30-day average≤ 34 lb/dall year003
BOD, carbonaceous [5 day, 20 C]7-day average≤ 55 lb/dall year003

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/IA0036986 · MCP: https://passage-data.com/mcp