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Johnstown Town of

Sewage treatment plant, Larimer County, Colorado. NPDES permit CO0047058 expired Apr 30, 2017; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (20 values), outfall 001 form Q quarterly (2 values), outfall 300 form I monthly (10 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 2 of 28 reports late

Limits in force (76)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademaximum weekly averagereport only (deg C)all year001
Temperature, water deg. centigradedaily maximumreport only (deg C)all year001
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 45 mg/Lall year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspended30-day average≤ 30 mg/Lall year001
Solids, total suspendedmaximum 7-day average≤ 45 mg/Lall year001
Nitrogen, ammonia total [as N]30-day average≤ 5.5 mg/LJun001
Nitrogen, ammonia total [as N]30-day average≤ 4.2 mg/LSep001
Nitrogen, ammonia total [as N]30-day average≤ 3.8 mg/LAug001
Nitrogen, ammonia total [as N]30-day average≤ 8.2 mg/LJan001
Nitrogen, ammonia total [as N]30-day average≤ 11 mg/LMar001
Nitrogen, ammonia total [as N]30-day average≤ 5 mg/LJul001
Nitrogen, ammonia total [as N]30-day average≤ 9 mg/LFeb001
Nitrogen, ammonia total [as N]30-day average≤ 12.5 mg/LOct001
Nitrogen, ammonia total [as N]30-day average≤ 9.8 mg/LNov001
Nitrogen, ammonia total [as N]30-day average≤ 5.4 mg/LMay001
Nitrogen, ammonia total [as N]30-day average≤ 6.4 mg/LApr001
Nitrogen, ammonia total [as N]30-day average≤ 7 mg/LDec001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jun001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Sep001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 23 mg/LJan001
Nitrogen, ammonia total [as N]daily maximum≤ 39 mg/LMar001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jul001
Nitrogen, ammonia total [as N]daily maximum≤ 33 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Oct001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Nov001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)May001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Apr001
Nitrogen, ammonia total [as N]daily maximum≤ 30 mg/LDec001
Selenium, potentially dissolvd30-day averagereport only (ug/L)all year001
Selenium, potentially dissolvddaily maximumreport only (ug/L)all year001
Oil and greaseinstantaneous maximum≤ 10 mg/Lall year001
Flow, in conduit or thru treatment plant30-day average≤ .5 MGDall year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residual30-day average≤ .011 mg/Lall year001
Chlorine, total residualinstantaneous maximum≤ .056 mg/Lall year001
E. coli30-day geometric mean≤ 630 #/100mLJan001
E. coli30-day geometric mean≤ 630 #/100mLFeb001
E. coli30-day geometric mean≤ 630 #/100mLMar001
E. coli30-day geometric mean≤ 630 #/100mLApr001
E. coli30-day geometric mean≤ 205 #/100mLMay001
E. coli30-day geometric mean≤ 205 #/100mLJun001
E. coli30-day geometric mean≤ 205 #/100mLJul001
E. coli30-day geometric mean≤ 205 #/100mLAug001
E. coli30-day geometric mean≤ 205 #/100mLSep001
E. coli30-day geometric mean≤ 205 #/100mLOct001
E. coli30-day geometric mean≤ 630 #/100mLNov001
E. coli30-day geometric mean≤ 630 #/100mLDec001
E. colimaximum 7-day geometric mean≤ 1260 #/100mLJan001
E. colimaximum 7-day geometric mean≤ 1260 #/100mLFeb001
E. colimaximum 7-day geometric mean≤ 1260 #/100mLMar001
E. colimaximum 7-day geometric mean≤ 1260 #/100mLApr001
E. colimaximum 7-day geometric mean≤ 410 #/100mLMay001
E. colimaximum 7-day geometric mean≤ 410 #/100mLJun001
E. colimaximum 7-day geometric mean≤ 410 #/100mLJul001
E. colimaximum 7-day geometric mean≤ 410 #/100mLAug001
E. colimaximum 7-day geometric mean≤ 410 #/100mLSep001
E. colimaximum 7-day geometric mean≤ 410 #/100mLOct001
E. colimaximum 7-day geometric mean≤ 1260 #/100mLNov001
E. colimaximum 7-day geometric mean≤ 1260 #/100mLDec001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Oil and grease visualinstantaneous maximumreport only (N=0;Y=1)all year001
Plant capacity fact. percent of capacity30-day averagereport only (%)all year300
Plant capacity fact. percent of capacity30-day averagereport only (%)all year300
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year300
BOD, 5-day, 20 deg. Cmaximum 7-day averagereport only (mg/L)all year300
BOD, 5-day, 20 deg. C30-day averagereport only (lb/d)all year300
BOD, 5-day, 20 deg. Cmaximum 7-day averagereport only (lb/d)all year300
Solids, total suspended30-day averagereport only (mg/L)all year300
Solids, total suspendedmaximum 7-day averagereport only (mg/L)all year300
Flow, in conduit or thru treatment plant30-day averagereport only (MGD)all year300
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year300

How strict are these limits?

Cited limits by parameter: Colorado'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/CO0047058 · MCP: https://passage-data.com/mcp