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Richfield, City of

Sewage treatment plant, Richfield, Idaho. NPDES permit ID0021211 expired Apr 30, 2026; its limits still apply. Last 12 months: over a limit 4 times (last April 2026), 8 required values missing, 13 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.

Last report on file
April 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 9 of 25 reports late

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

Period endingParameterReportedLimitOver by
January 2026pH, instantaneous minimum6.18 SU≥ 6.5 SU—
March 2026BOD, 5-day, 20 deg. C, monthly average20.94 lb/d≤ 20 lb/d5%
March 2026Solids, total suspended, monthly average55 mg/L≤ 45 mg/L22%
April 2026Suspended solids, total annual, annual average29.81 lb/d≤ 21.8 lb/d37%

Limits in force (36)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademonthly averagereport only (deg C)Jan, Feb, Mar, Apr, Nov, Dec001
Temperature, water deg. centigrademaximum daily averagereport only (deg C)Jan, Feb, Mar, Apr, Nov, Dec001
Oxygen, dissolved [DO]instantaneous minimumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmonthly average≤ 39 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cweekly average≤ 59 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmonthly average≤ 20 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cweekly average≤ 30 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec001
pHinstantaneous minimum≥ 6.5 SUJan, Feb, Mar, Apr, Nov, Dec001
pHinstantaneous maximum≤ 9 SUJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendedmonthly average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendedweekly average≤ 65 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendedmonthly average≤ 23 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendedweekly average≤ 33 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendedmonthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec001
E. coli, MTEC-MFmonthly geometric mean≤ 126 #/100mLJan, Feb, Mar, Apr, Nov, Dec001
E. coli, MTEC-MFinstantaneous maximumreport only (#/100mL)Jan, Feb, Mar, Apr, Nov, Dec001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)Jan, Feb, Mar, Apr, Nov, Dec001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)Jan, Feb, Mar, Apr, Nov, Dec001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)Jan, Feb, Mar, Apr, Nov, Dec001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)Jan, Feb, Mar, Apr, Nov, Dec001
Chlorine, total residualmonthly average≤ .05 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Chlorine, total residualdaily maximum≤ .05 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Chlorine, total residualmonthly average≤ .025 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Chlorine, total residualdaily maximum≤ .025 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Suspended solids, total annualannual average≤ 21.8 lb/dApr001
BOD, 5-day, percent removalmonthly average minimum≥ 81 %Jan, Feb, Mar, Apr, Nov, Dec001
Solids, suspended percent removalmonthly average minimum≥ 65 %Jan, Feb, Mar, Apr, Nov, Dec001
Temperature, water deg. centigrademonthly averagereport only (deg C)Jan, Feb, Mar, Apr, Nov, DecREC1
Temperature, water deg. centigrademaximum daily averagereport only (deg C)Jan, Feb, Mar, Apr, Nov, DecREC1
Oxygen, dissolved [DO]instantaneous minimumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, DecREC1
Oxygen, dissolved [DO]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, DecREC1
pHinstantaneous minimumreport only (SU)Jan, Feb, Mar, Apr, Nov, DecREC1
pHinstantaneous maximumreport only (SU)Jan, Feb, Mar, Apr, Nov, DecREC1
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, DecREC1
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, DecREC1

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/ID0021211 · MCP: https://passage-data.com/mcp