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St Marys Glacier WSD

Sewage treatment plant, Idaho Springs, Colorado. NPDES permit CO0023094 expired Jun 30, 2021; its limits still apply. Last 12 months: over a limit 8 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (21 values), outfall 001 form B monthly (20 values), outfall 001A form Q quarterly (9 values), outfall 001B form Q quarterly (9 values), outfall 300 form I monthly (10 values), outfall UST1 form A monthly (2 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
16 values over a limit, 0 required values missing, 0 of 56 reports late

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

Period endingOutfallParameterReportedLimitOver by
December 2025001ACopper, potentially dissolved, 30-day average8.65 ug/L≤ 2.7 ug/L220%
December 2025001ACopper, potentially dissolved, daily maximum8.65 ug/L≤ 3.6 ug/L140%
March 2026001pH, minimum6.35 SU≥ 6.5 SU—
March 2026001ACopper, potentially dissolved, 30-day average9.3 ug/L≤ 2.7 ug/L244%
March 2026001ACopper, potentially dissolved, daily maximum9.3 ug/L≤ 3.6 ug/L158%
June 2026001ACopper, potentially dissolved, 30-day average18.2 ug/L≤ 2.7 ug/L574%
June 2026001ACopper, potentially dissolved, daily maximum18.2 ug/L≤ 3.6 ug/L406%
July 2026001Nitrogen, ammonia total [as N], 30-day average11.7 mg/L≤ 4.4 mg/L166%

Limits in force (160)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/Lall 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
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. C30-day average≤ 150 lb/dall year001
BOD, 5-day, 20 deg. C30-day average≤ 63 lb/dall year001
pHminimum≥ 6.5 SUall year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 9 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspended30-day average≤ 30 mg/Lall year001
Solids, total suspended30-day average≤ 30 mg/Lall year001
Solids, total suspendedmaximum 7-day average≤ 45 mg/Lall year001
Solids, total suspendedmaximum 7-day average≤ 45 mg/Lall year001
Solids, total suspended30-day average≤ 63 lb/dall year001
Solids, total suspended30-day average≤ 150 lb/dall year001
Nitrogen, ammonia total [as N]30-day average≤ 28.5 mg/LApr001
Nitrogen, ammonia total [as N]30-day average≤ 29 mg/LJan001
Nitrogen, ammonia total [as N]30-day average≤ 30.6 mg/LFeb001
Nitrogen, ammonia total [as N]30-day average≤ 3.9 mg/LAug001
Nitrogen, ammonia total [as N]30-day average≤ 31.8 mg/LMay001
Nitrogen, ammonia total [as N]30-day average≤ 4.4 mg/LJul001
Nitrogen, ammonia total [as N]30-day average≤ 10.7 mg/LJun001
Nitrogen, ammonia total [as N]30-day average≤ 23.8 mg/LDec001
Nitrogen, ammonia total [as N]30-day average≤ 28.7 mg/LMar001
Nitrogen, ammonia total [as N]30-day average≤ 5.4 mg/LSep001
Nitrogen, ammonia total [as N]30-day average≤ 23.2 mg/LNov001
Nitrogen, ammonia total [as N]30-day average≤ 22.8 mg/LOct001
Nitrogen, ammonia total [as N]30-day average≤ 7.2 mg/LApr001
Nitrogen, ammonia total [as N]30-day average≤ 7.2 mg/LJan001
Nitrogen, ammonia total [as N]30-day average≤ 7.8 mg/LFeb001
Nitrogen, ammonia total [as N]30-day average≤ 4.5 mg/LJun001
Nitrogen, ammonia total [as N]30-day average≤ 8.1 mg/LMay001
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LAug001
Nitrogen, ammonia total [as N]30-day average≤ 1.8 mg/LJul001
Nitrogen, ammonia total [as N]30-day average≤ 8.4 mg/LMar001
Nitrogen, ammonia total [as N]30-day average≤ 7.1 mg/LDec001
Nitrogen, ammonia total [as N]30-day average≤ 7.5 mg/LOct001
Nitrogen, ammonia total [as N]30-day average≤ 7.3 mg/LNov001
Nitrogen, ammonia total [as N]30-day average≤ 2.2 mg/LSep001
Nitrogen, ammonia total [as N]30-day average≤ 7.9 mg/LJan001
Nitrogen, ammonia total [as N]30-day average≤ 8.9 mg/LFeb001
Nitrogen, ammonia total [as N]30-day average≤ 9.6 mg/LMar001
Nitrogen, ammonia total [as N]30-day average≤ 8 mg/LApr001
Nitrogen, ammonia total [as N]30-day average≤ 9.2 mg/LMay001
Nitrogen, ammonia total [as N]30-day average≤ 8.9 mg/LJun001
Nitrogen, ammonia total [as N]30-day average≤ 4.4 mg/LJul001
Nitrogen, ammonia total [as N]30-day average≤ 3.9 mg/LAug001
Nitrogen, ammonia total [as N]30-day average≤ 5.4 mg/LSep001
Nitrogen, ammonia total [as N]30-day average≤ 8.2 mg/LOct001
Nitrogen, ammonia total [as N]30-day average≤ 8 mg/LNov001
Nitrogen, ammonia total [as N]30-day average≤ 7.7 mg/LDec001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Apr001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Feb001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Aug001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)May001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jul001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jun001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Dec001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Mar001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Sep001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Nov001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 21.1 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 26.9 mg/LJan001
Nitrogen, ammonia total [as N]daily maximum≤ 21.1 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 31.8 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum≤ 28.6 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 28.3 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 30.5 mg/LJul001
Nitrogen, ammonia total [as N]daily maximum≤ 27.8 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 27 mg/LDec001
Nitrogen, ammonia total [as N]daily maximum≤ 30 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 26.5 mg/LNov001
Nitrogen, ammonia total [as N]daily maximum≤ 30.4 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 28 mg/LJan001
Nitrogen, ammonia total [as N]daily maximum≤ 22 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 29 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 21 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 30 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 34 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum≤ 31 mg/LJul001
Nitrogen, ammonia total [as N]daily maximum≤ 29 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 32 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 31 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 27 mg/LNov001
Nitrogen, ammonia total [as N]daily maximum≤ 28 mg/LDec001
Oil and greaseinstantaneous maximum≤ 10 mg/Lall year001
Oil and greaseinstantaneous maximum≤ 10 mg/Lall year001
Flow, in conduit or thru treatment plant30-day average≤ .25 MGDall year001
Flow, in conduit or thru treatment plant30-day average≤ .6 MGDall year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residual30-day average≤ .01 mg/Lall year001
Chlorine, total residual30-day average≤ .01 mg/Lall year001
Chlorine, total residualinstantaneous maximum≤ .02 mg/Lall year001
E. coli30-day geometric mean≤ 148 #/100mLall year001
E. coli30-day geometric mean≤ 157 #/100mLall year001
E. colimaximum 7-day geometric mean≤ 296 #/100mLall year001
E. colimaximum 7-day geometric mean≤ 314 #/100mLall year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
BOD, 5-day, percent removalmonthly average minimumreport only (%)all year001
BOD, 5-day, percent removalmonthly average minimumreport only (%)all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimumreport only (%)all year001
Solids, suspended percent removalmonthly average minimumreport only (%)all year001
Oil and grease visualinstantaneous maximumreport only (abst=0;prst=1)all year001
Oil and grease visualinstantaneous maximumreport only (abst=0;prst=1)all year001
Oil and grease visualdaily maximumreport only (abst=0;prst=1)all year001
Zinc, potentially dissolved30-day averagereport only (ug/L)all year001A
Zinc, potentially dissolved30-day average≤ 46 ug/Lall year001A
Zinc, potentially dissolveddaily maximumreport only (ug/L)all year001A
Zinc, potentially dissolveddaily maximum≤ 49 ug/Lall year001A
Copper, potentially dissolved30-day averagereport only (ug/L)all year001A
Copper, potentially dissolved30-day average≤ 2.7 ug/Lall year001A
Copper, potentially dissolveddaily maximumreport only (ug/L)all year001A
Copper, potentially dissolveddaily maximum≤ 3.6 ug/Lall year001A
Copper, potentially dissolveddaily maximum≤ .15 lb/dall year001A
Copper, potentially dissolveddaily maximum≤ .015 lb/dall year001A
Cadmium, potentially dissolvd30-day averagereport only (ug/L)all year001A
Cadmium, potentially dissolvd30-day average≤ .15 ug/Lall year001A
Cadmium, potentially dissolvddaily maximumreport only (ug/L)all year001A
Cadmium, potentially dissolvddaily maximumreport only (ug/L)all year001A
Lead, potentially dissolvd30-day averagereport only (ug/L)all year001A
Lead, potentially dissolvd30-day average≤ .54 ug/Lall year001A
Lead, potentially dissolvddaily maximumreport only (ug/L)all year001A
Lead, potentially dissolvddaily maximumreport only (ug/L)all year001A
Zinc, potentially dissolved30-day averagereport only (ug/L)all year001B
Zinc, potentially dissolved30-day average≤ 39 ug/Lall year001B
Zinc, potentially dissolveddaily maximumreport only (ug/L)all year001B
Zinc, potentially dissolveddaily maximum≤ 47 ug/Lall year001B
Copper, potentially dissolved30-day averagereport only (ug/L)all year001B
Copper, potentially dissolved30-day average≤ 2.7 ug/Lall year001B
Copper, potentially dissolveddaily maximumreport only (ug/L)all year001B
Copper, potentially dissolveddaily maximum≤ 3.6 ug/Lall year001B
Copper, potentially dissolveddaily maximum≤ .15 lb/dall year001B
Copper, potentially dissolveddaily maximum≤ .015 lb/dall year001B
Cadmium, potentially dissolvd30-day averagereport only (ug/L)all year001B
Cadmium, potentially dissolvd30-day average≤ .15 ug/Lall year001B
Cadmium, potentially dissolvddaily maximumreport only (ug/L)all year001B
Cadmium, potentially dissolvddaily maximumreport only (ug/L)all year001B
Lead, potentially dissolvd30-day averagereport only (ug/L)all year001B
Lead, potentially dissolvd30-day average≤ .5 ug/Lall year001B
Lead, potentially dissolvddaily maximumreport only (ug/L)all year001B
Lead, potentially dissolvddaily maximumreport only (ug/L)all year001B
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
Temperature, water deg. centigrademaximum weekly averagereport only (deg C)all yearUST1
Temperature, water deg. centigradedaily maximumreport only (deg C)all yearUST1

How strict are these limits?

Cited limits by parameter: Colorado'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/CO0023094 · MCP: https://passage-data.com/mcp