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Del Norte Town of

Sewage treatment plant, Del Norte, Colorado. NPDES permit CO0020281 expired Dec 31, 2024; its limits still apply. Last 12 months: over a limit 26 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (30 values), outfall 001 form Q quarterly (33 values), outfall 001 form W quarterly (2 values), outfall 300 form I monthly (10 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
56 values over a limit, 0 required values missing, 4 of 32 reports late

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

All 26 values over a limit
Period endingParameterReportedLimitOver by
October 2025Copper, potentially dissolved, 30-day average3.7 ug/L≤ 3.1 ug/L19%
November 2025BOD, 5-day, percent removal, monthly average minimum83 %≥ 85 %13%
November 2025Copper, potentially dissolved, 30-day average3.8 ug/L≤ 3.1 ug/L23%
November 2025Nitrogen, ammonia total [as N], rolling average8.91 mg/L≤ 8.4 mg/L6%
December 2025BOD, 5-day, 20 deg. C, 30-day average31 mg/L≤ 30 mg/L3%
December 2025BOD, 5-day, percent removal, monthly average minimum79 %≥ 85 %40%
December 2025LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia, minimum value57.55 %≥ 100 %42%
December 2025LC50 Static Renewal 96Hr Acute Pimephales promelas, minimum value85.3 %≥ 100 %15%
December 2025Nitrogen, ammonia total [as N], 30-day average13.12 mg/L≤ 11 mg/L19%
January 2026BOD, 5-day, 20 deg. C, 30-day average33 mg/L≤ 30 mg/L10%
January 2026BOD, 5-day, percent removal, monthly average minimum84 %≥ 85 %7%
January 2026Copper, potentially dissolved, 30-day average7.3 ug/L≤ 3.1 ug/L135%
February 2026BOD, 5-day, percent removal, monthly average minimum79 %≥ 85 %40%
February 2026Copper, potentially dissolved, 30-day average8.5 ug/L≤ 3.1 ug/L174%
March 2026BOD, 5-day, 20 deg. C, 30-day average41 mg/L≤ 30 mg/L37%
March 2026BOD, 5-day, 20 deg. C, maximum 7-day average51 mg/L≤ 45 mg/L13%
March 2026BOD, 5-day, percent removal, monthly average minimum83 %≥ 85 %13%
March 2026Copper, potentially dissolved, 30-day average6.2 ug/L≤ 3.1 ug/L100%
April 2026BOD, 5-day, percent removal, monthly average minimum78 %≥ 85 %47%
April 2026Copper, potentially dissolved, 30-day average7 ug/L≤ 3.1 ug/L126%
May 2026Copper, potentially dissolved, 30-day average5.9 ug/L≤ 3.1 ug/L90%
June 2026Copper, potentially dissolved, 30-day average8.9 ug/L≤ 3.1 ug/L187%
June 2026LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia, minimum value76.19 %≥ 100 %24%
June 2026Zinc, potentially dissolved, 30-day average59.5 ug/L≤ 48 ug/L24%
July 2026Copper, potentially dissolved, 30-day average7.3 ug/L≤ 3.1 ug/L135%
August 2026Copper, potentially dissolved, 30-day average6.7 ug/L≤ 3.1 ug/L116%

Limits in force (136)

ParameterStatisticLimitMonthsOutfall
Herbicides, total30-day averagereport only (ug/L)all year001
Herbicides, totaldaily maximumreport only (ug/L)all year001
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≤ 247 lb/dall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 371 lb/dall year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspended30-day average≤ 75 mg/Lall year001
Solids, total suspendedmaximum 7-day average≤ 110 mg/Lall year001
Nitrogen, ammonia total [as N]30-day average≤ 65 mg/LJan001
Nitrogen, ammonia total [as N]30-day average≤ 64 mg/LFeb001
Nitrogen, ammonia total [as N]30-day average≤ 58 mg/LMar001
Nitrogen, ammonia total [as N]30-day average≤ 65 mg/LApr001
Nitrogen, ammonia total [as N]30-day average≤ 36 mg/LMay001
Nitrogen, ammonia total [as N]30-day average≤ 65 mg/LJun001
Nitrogen, ammonia total [as N]30-day average≤ 65 mg/LJul001
Nitrogen, ammonia total [as N]30-day average≤ 61 mg/LAug001
Nitrogen, ammonia total [as N]30-day average≤ 51 mg/LSep001
Nitrogen, ammonia total [as N]30-day average≤ 65 mg/LOct001
Nitrogen, ammonia total [as N]30-day average≤ 65 mg/LNov001
Nitrogen, ammonia total [as N]30-day average≤ 65 mg/LDec001
Nitrogen, ammonia total [as N]30-day average≤ 16 mg/LJan001
Nitrogen, ammonia total [as N]30-day average≤ 16.6 mg/LFeb001
Nitrogen, ammonia total [as N]30-day average≤ 13.8 mg/LMar001
Nitrogen, ammonia total [as N]30-day average≤ 10.8 mg/LApr001
Nitrogen, ammonia total [as N]30-day average≤ 65 mg/LMay001
Nitrogen, ammonia total [as N]30-day average≤ 11 mg/LDec001
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LJan001
Nitrogen, ammonia total [as N]daily maximum≤ 64 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 58 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LJul001
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LNov001
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LDec001
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LJan001
Nitrogen, ammonia total [as N]daily maximum≤ 64 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 58 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LDec001
Nitrogen, ammonia total [as N]rolling average≤ 29 mg/LOct001
Nitrogen, ammonia total [as N]rolling average≤ 20 mg/LAug001
Nitrogen, ammonia total [as N]rolling average≤ 35 mg/LJan001
Nitrogen, ammonia total [as N]rolling average≤ 23 mg/LSep001
Nitrogen, ammonia total [as N]rolling average≤ 23 mg/LMar001
Nitrogen, ammonia total [as N]rolling average≤ 19 mg/LNov001
Nitrogen, ammonia total [as N]rolling average≤ 56 mg/LMay001
Nitrogen, ammonia total [as N]rolling average≤ 35 mg/LFeb001
Nitrogen, ammonia total [as N]rolling average≤ 43 mg/LApr001
Nitrogen, ammonia total [as N]rolling average≤ 19 mg/LJul001
Nitrogen, ammonia total [as N]rolling average≤ 39 mg/LJun001
Nitrogen, ammonia total [as N]rolling average≤ 23 mg/LDec001
Nitrogen, ammonia total [as N]rolling average≤ 15 mg/LMay001
Nitrogen, ammonia total [as N]rolling average≤ 12 mg/LJun001
Nitrogen, ammonia total [as N]rolling average≤ 11 mg/LJul001
Nitrogen, ammonia total [as N]rolling average≤ 10 mg/LAug001
Nitrogen, ammonia total [as N]rolling average≤ 9.6 mg/LSep001
Nitrogen, ammonia total [as N]rolling average≤ 9.4 mg/LOct001
Nitrogen, ammonia total [as N]rolling average≤ 8.4 mg/LNov001
Nitrogen, inorganic totaldaily maximum≤ 100 mg/Lall year001
Nitrogen, inorganic totalrolling average≤ 19 mL/Lall year001
Arsenic, total recoverable30-day averagereport only (ug/L)all year001
Zinc, potentially dissolved30-day averagereport only (ug/L)all year001
Zinc, potentially dissolved30-day average≤ 48 ug/Lall year001
Zinc, potentially dissolveddaily maximumreport only (ug/L)all year001
Zinc, potentially dissolveddaily maximum≤ 245 ug/Lall year001
Copper, potentially dissolved30-day averagereport only (ug/L)all year001
Copper, potentially dissolved30-day average≤ 3.1 ug/Lall year001
Copper, potentially dissolveddaily maximum≤ 32 ug/Lall year001
Copper, potentially dissolveddaily maximum≤ 32 ug/Lall year001
Copper, potentially dissolvedrolling averagereport only (ug/L)all year001
Cadmium, potentially dissolvd30-day average≤ 3.7 ug/Lall year001
Cadmium, potentially dissolvd30-day averagereport only (ug/L)all year001
Cadmium, potentially dissolvddaily maximum≤ 9.3 ug/Lall year001
Cadmium, potentially dissolvddaily maximumreport only (ug/L)all year001
Cadmium, potentially dissolvdrolling averagereport only (ug/L)all year001
Lead, potentially dissolvd30-day averagereport only (ug/L)all year001
Lead, potentially dissolvddaily maximumreport only (ug/L)all year001
Uranium, potentially dissolvd30-day averagereport only (ug/L)all year001
Uranium, potentially dissolvddaily maximumreport only (ug/L)all year001
Oil and greaseinstantaneous maximum≤ 10 mg/Lall year001
Radium 226 + radium 228, total30-day averagereport only (pCi/L)all year001
Radium 226 + radium 228, totaldaily maximumreport only (pCi/L)all year001
Strontium 90, total30-day averagereport only (pCi/L)all year001
Strontium 90, totaldaily maximumreport only (pCi/L)all year001
Uranium, total30-day averagereport only (ug/L)all year001
Uranium, totaldaily maximumreport only (ug/L)all year001
Cesium-13430-day averagereport only (pCi/L)all year001
Cesium-134daily maximumreport only (pCi/L)all year001
Chlorpyrifos30-day averagereport only (ug/L)all year001
Chlorpyrifosdaily maximumreport only (ug/L)all year001
Phosphated pesticides30-day averagereport only (ug/L)all year001
Endosulfan, total30-day averagereport only (ug/L)all year001
2,4-Dichlorophenoxyacetic acid30-day averagereport only (ug/L)all year001
Flow, in conduit or thru treatment plant30-day average≤ .99 MGDall year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residual30-day average≤ .48 mg/Lall year001
Chlorine, total residualinstantaneous maximum≤ .29 mg/Lall year001
E. coli30-day geometric mean≤ 2000 #/100mLall year001
E. colimaximum 7-day geometric mean≤ 4000 #/100mLall year001
E. colirolling average≤ 1136 #/100mLall year001
Prometon30-day averagereport only (ug/L)all year001
Thorium-230 + Thorium-23230-day averagereport only (pCi/L)all year001
Thorium-230 + Thorium-232daily maximumreport only (pCi/L)all year001
Pesticides, general30-day averagereport only (ug/L)all year001
Pesticides, generaldaily maximumreport only (ug/L)all year001
Chlorinated pesticides, total30-day averagereport only (ug/L)all year001
Chlorinated pesticides, totaldaily maximumreport only (ug/L)all year001
Organic pesticide chemicals [40 CFR455]30-day averagereport only (ug/L)all year001
Organic pesticide chemicals [40 CFR455]daily maximumreport only (ug/L)all year001
Glyphosate, total30-day averagereport only (ug/L)all year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Total pesticides30-day averagereport only (ug/L)all year001
Total pesticidesdaily maximumreport only (ug/L)all year001
Metribuzin30-day averagereport only (ug/L)all year001
Oil and grease visualinstantaneous maximumreport only (abst=0;prst=1)all year001
LC50 Static Renewal 48Hr Acute Ceriodaphnia dubiaminimum value≥ 100 %all year001
LC50 Static Renewal 96Hr Acute Pimephales promelasminimum value≥ 100 %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.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/CO0020281 · MCP: https://passage-data.com/mcp