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Iowa Town of SD #1

Sewage treatment plant, Iowa, Louisiana. NPDES permit LA0043605, in force until Jan 31, 2031. Last 12 months: over a limit 15 times (last August 2026), 2 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A quarterly, form Q quarterly, form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
22 values over a limit, 0 required values missing, 1 of 16 reports late

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

All 15 values over a limit
Period endingParameterReportedLimitOver by
February 2026Nitrogen, ammonia total [as N], monthly average5.71 mg/L≤ 5 mg/L14%
March 2026Nitrogen, ammonia total [as N], monthly average11.97 mg/L≤ 5 mg/L139%
March 2026Nitrogen, ammonia total [as N], weekly average14.8 mg/L≤ 10 mg/L48%
March 2026Solids, total suspended, monthly average20.71 mg/L≤ 15 mg/L38%
March 2026Solids, total suspended, weekly average62 mg/L≤ 23 mg/L170%
April 2026Nitrogen, ammonia total [as N], monthly average5.43 mg/L≤ 5 mg/L9%
April 2026Nitrogen, ammonia total [as N], weekly average13.3 mg/L≤ 10 mg/L33%
June 2026Nitrogen, ammonia total [as N], monthly average29.48 lb/d≤ 21 lb/d40%
June 2026Nitrogen, ammonia total [as N], monthly average8.06 mg/L≤ 5 mg/L61%
June 2026Nitrogen, ammonia total [as N], weekly average10.3 mg/L≤ 10 mg/L3%
July 2026Nitrogen, ammonia total [as N], monthly average10.98 mg/L≤ 5 mg/L120%
July 2026Nitrogen, ammonia total [as N], monthly average33.2 lb/d≤ 21 lb/d58%
July 2026Nitrogen, ammonia total [as N], weekly average11.9 mg/L≤ 10 mg/L19%
August 2026Nitrogen, ammonia total [as N], monthly average6.36 mg/L≤ 5 mg/L27%
August 2026Nitrogen, ammonia total [as N], weekly average11.5 mg/L≤ 10 mg/L15%

Limits in force (50)

ParameterStatisticLimitMonths
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous minimum≥ 6 SUall year
pHweekly average≤ 9 SUall year
pHweekly average≤ 9 SUall year
Solids, total suspendedmonthly average≤ 15 mg/Lall year
Solids, total suspendedmonthly average≤ 15 mg/Lall year
Solids, total suspendedweekly average≤ 23 mg/Lall year
Solids, total suspendedweekly average≤ 23 mg/Lall year
Solids, total suspendedmonthly average≤ 63 lb/dall year
Solids, total suspendedmonthly average≤ 63 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]weekly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/Lall year
Nitrogen, ammonia total [as N]weekly average≤ 10 mg/Lall year
Nitrogen, ammonia total [as N]weekly average≤ 10 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 21 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 21 lb/dall year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]weekly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year
Chlorine, total residualinstantaneous maximumreport only (mg/L)all year
Chlorine, total residualinstantaneous maximumreport only (mg/L)all year
Solids, total dissolvedmonthly averagereport only (mg/L)all year
Solids, total dissolvedweekly averagereport only (mg/L)all year
Solids, total dissolvedmonthly averagereport only (lb/d)all year
Mercury, total [as Hg]monthly averagereport only (mg/L)all year
Mercury, total [as Hg]weekly averagereport only (mg/L)all year
Mercury, total [as Hg]monthly averagereport only (lb/d)all year
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year
Coliform, fecal generalweekly geometric mean≤ 400 #/100mLall year
Coliform, fecal generalweekly geometric mean≤ 400 #/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 42 lb/dall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 42 lb/dall year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]weekly averagereport only (mg/L)all year
BOD, carbonaceous, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year

New limits from Feb 1, 2029

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Chlorine, total residual, instantaneous maximum0.033 mg/Lnew2.97 mg/L (5 values)90×
Nitrogen, ammonia total [as N], monthly average4.2 mg/Ltighter5.43 mg/L (11 values, 2 below detection)1.29×
Nitrogen, ammonia total [as N], weekly average7.6 mg/Ltighter9.58 mg/L (11 values, 2 below detection)1.26×
Nitrogen, ammonia total [as N], monthly average17 lb/dtighter12.37 lb/d (11 values)0.728×

How strict are these limits?

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

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/LA0043605 · MCP: https://passage-data.com/mcp