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Castle Valley Special Service

Sewage treatment plant, Castle Dale, Utah. NPDES permit UT0023663, in force until Sep 30, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (30 values), form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 13 reports late

Limits in force (39)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 5 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 25 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 35 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≤ 25 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 35 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≤ 4.3 mg/LJul–Sep
Nitrogen, ammonia total [as N]maximum monthly average≤ 4.7 mg/LOct–Dec
Nitrogen, ammonia total [as N]maximum monthly average≤ 4.8 mg/LApr–Jun
Nitrogen, ammonia total [as N]maximum monthly average≤ 4.7 mg/LJan–Mar
Nitrogen, ammonia total [as N]daily maximum≤ 9.5 mg/LJul–Sep
Nitrogen, ammonia total [as N]daily maximum≤ 9.1 mg/LOct–Dec
Nitrogen, ammonia total [as N]daily maximum≤ 9.1 mg/LApr–Jun
Nitrogen, ammonia total [as N]daily maximum≤ 9.3 mg/LJan–Mar
Nitrogen, Kjeldahl, total [as N]maximum monthly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]maximum monthly averagereport only (mg/L)all year
Phosphorus, total [as P]30-day averagereport only (mg/L)all year
Phosphorus, total [as P]annual maximum≤ 324 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≤ .024 mg/Lall year
E. colimaximum monthly average≤ 126 #/100mLall year
E. colimaximum weekly average≤ 157 #/100mLall year
Solids, total dissolvedmaximum monthly averagereport only (mg/L)all year
Solids, total dissolveddaily maximum≤ 3500 mg/Lall year
Solids, total dissolvedmaximum monthly averagereport only (ton/d)all year
Solids, total dissolvedannual average≤ 1 ton/dall year
Solids, total dissolvedannual maximum≤ 366 ton/yrall 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, 5-day, percent removalminimum≥ 85 %all year
Solids, suspended percent removalminimum % removal≥ 85 %all year
Flow, totalmaximum monthly average≤ .7 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/UT0023663 · MCP: https://passage-data.com/mcp