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Twin Falls, City of

Sewage treatment plant, major discharger, Twin Falls, Idaho. NPDES permit ID0021270 expired Oct 31, 2014; its limits still apply. Last 12 months: over a limit 3 times (last May 2026), 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 10 days after each period: form A monthly (35 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
5 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
October 2025Solids, total suspended, weekly average4432.767 lb/d≤ 3213 lb/d38%
October 2025Solids, total suspended, weekly average51.771 mg/L≤ 45 mg/L15%
May 2026Phosphorus, total [as P], weekly average1001.528 lb/d≤ 990 lb/d1%

Limits in force (39)

ParameterStatisticLimitMonths
Temperature, water deg. centigradeweekly averagereport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 2142 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 3213 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cweekly averagereport only (mg/L)all year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 2142 lb/dall year
Solids, total suspendedweekly average≤ 3213 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly average≤ 3.8 mg/LApr–Sep
Nitrogen, ammonia total [as N]daily maximum≤ 5.4 mg/LApr–Sep
Nitrogen, ammonia total [as N]monthly average≤ 247 lb/dApr–Sep
Nitrogen, ammonia total [as N]daily maximum≤ 351 lb/dApr–Sep
Nitrogen, ammonia total [as N]monthly average≤ 5.2 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 7.5 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 338 lb/dJan, Feb, Mar, Apr, Oct, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 488 lb/dJan, Feb, Mar, Apr, Oct, Nov, Dec
Nitrogen, nitrate total [as N]monthly averagereport only (mg/L)all year
Nitrogen, nitrate total [as N]daily maximumreport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all 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 average≤ 710 lb/dall year
Phosphorus, total [as P]weekly average≤ 990 lb/dall year
E. coli, MTEC-MFgeometric mean≤ 126 #/100mLall year
E. coli, MTEC-MFinstantaneous maximum≤ 406 #/100mLall year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Toxicity, final conc toxicity unitsmaximumreport only (toxic)all year
BOD, 5-day, percent removalminimum≥ 85 %all year
Solids, suspended percent removalminimum≥ 85 %all year

How strict are these limits?

Cited limits by parameter: Idaho'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/ID0021270 · MCP: https://passage-data.com/mcp