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Castle Valley SSD-(Huntington)

Sewage treatment plant, Castle Dale, Utah. NPDES permit UT0021296, in force until Sep 30, 2030. Last 12 months: over a limit 4 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (29 values), form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
5 values over a limit, 0 required values missing, 0 of 13 reports late

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

Period endingParameterReportedLimitOver by
November 2025Solids, suspended percent removal, minimum % removal42 %≥ 85 %287%
November 2025Solids, total suspended, maximum weekly average97 mg/L≤ 65 mg/L49%
February 2026Solids, suspended percent removal, minimum % removal83.75 %≥ 85 %8%
June 2026Solids, suspended percent removal, minimum % removal81 %≥ 85 %27%

Limits in force (38)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 5 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 65 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum monthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmaximum weekly averagereport only (mg/L)all year
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmaximum monthly average≤ 45 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 65 mg/Lall year
Solids, total suspendedmaximum monthly averagereport only (mg/L)all year
Solids, total suspendedmaximum weekly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]maximum monthly average≤ 5.6 mg/LJul–Sep
Nitrogen, ammonia total [as N]maximum monthly average≤ 5.4 mg/LApr–Jun
Nitrogen, ammonia total [as N]maximum monthly average≤ 5.7 mg/LOct–Dec
Nitrogen, ammonia total [as N]maximum monthly average≤ 5.9 mg/LJan–Mar
Nitrogen, ammonia total [as N]daily maximum≤ 12.2 mg/LJul–Sep
Nitrogen, ammonia total [as N]daily maximum≤ 12.5 mg/LApr–Jun
Nitrogen, ammonia total [as N]daily maximum≤ 11.8 mg/LOct–Dec
Nitrogen, ammonia total [as N]daily maximum≤ 14.1 mg/LJan–Mar
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (mg/L)all year
Phosphorus, total [as P]30-day averagereport only (mg/L)all year
Phosphorus, total [as P]annual maximum≤ 563 lb/yrall year
Phosphorus, total [as P]30-day averagereport only (mg/L)all year
Oil and greasedaily maximum≤ 10 mg/Lall year
Phosphate, ortho [as P]30-day averagereport only (mg/L)all year
Chlorine, total residualdaily maximum≤ .022 mg/Lall year
E. colimaximum monthly average≤ 126 #/100mLall year
E. colimaximum weekly average≤ 158 #/100mLall year
Solids, total dissolveddaily maximum≤ 4800 mg/Lall year
Solids, total dissolvedmaximum monthly averagereport only (ton/d)all year
Solids, total dissolvedannual maximum≤ 366 ton/yrall year
Solids, total dissolvedannual average≤ 1 ton/dall year
Nitrogen, nitrate total [as NO3]maximum monthly averagereport only (mg/L)all year
Nitrogen, nitrite total [as NO2]maximum monthly averagereport only (mg/L)all year
BOD, carb-5 day, 20 deg C, percent removalminimum≥ 65 %all year
Solids, suspended percent removalminimum % removal≥ 85 %all year
Flow, totalmaximum monthly average≤ .8 MGDall year

How strict are these limits?

Cited limits by parameter: Utah'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/UT0021296 · MCP: https://passage-data.com/mcp