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Boulder County

Sewage treatment plant, Boulder County, Colorado. NPDES permit CO0047651 expired Mar 31, 2022; its limits still apply. Last 12 months: over a limit 13 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (14 values), outfall 001 form Q quarterly (9 values), outfall 300 form I monthly (10 values), outfall 001 form S twice a year
Last report on file
August 2026
Oct 2024 – Sep 2025
30 values over a limit, 3 required values missing, 3 of 30 reports late

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

All 13 values over a limit
Period endingParameterReportedLimitOver by
October 2025E. coli, rolling average352.7 #/100mL≤ 127 #/100mL178%
October 2025Nitrogen, inorganic total, daily maximum12.9 mg/L≤ 10 mg/L29%
November 2025E. coli, rolling average353.6 #/100mL≤ 127 #/100mL178%
November 2025Nitrogen, inorganic total, daily maximum16.2 mg/L≤ 10 mg/L62%
December 2025E. coli, rolling average385.7 #/100mL≤ 127 #/100mL204%
January 2026E. coli, rolling average339.5 #/100mL≤ 127 #/100mL167%
February 2026E. coli, rolling average365 #/100mL≤ 127 #/100mL187%
March 2026E. coli, rolling average361 #/100mL≤ 127 #/100mL184%
April 2026E. coli, rolling average260 #/100mL≤ 127 #/100mL105%
May 2026E. coli, rolling average254 #/100mL≤ 127 #/100mL100%
June 2026E. coli, rolling average254 #/100mL≤ 127 #/100mL100%
July 2026E. coli, rolling average254 #/100mL≤ 127 #/100mL100%
August 2026E. coli, rolling average254 #/100mL≤ 127 #/100mL100%

Limits in force (75)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademaximum weekly averagereport only (deg C)Jan, Feb, Mar, Apr, Nov, Dec001
Temperature, water deg. centigradedaily maximumreport only (deg C)Jan, Feb, Mar, Apr, Nov, Dec001
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≤ 33 mg/LApr001
Nitrogen, ammonia total [as N]30-day average≤ 26 mg/LFeb001
Nitrogen, ammonia total [as N]30-day average≤ 26 mg/LJan001
Nitrogen, ammonia total [as N]30-day average≤ 65 mg/LJul001
Nitrogen, ammonia total [as N]30-day average≤ 65 mg/LJun001
Nitrogen, ammonia total [as N]30-day average≤ 65 mg/LAug001
Nitrogen, ammonia total [as N]30-day average≤ 65 mg/LMay001
Nitrogen, ammonia total [as N]30-day average≤ 24 mg/LMar001
Nitrogen, ammonia total [as N]30-day average≤ 26 mg/LDec001
Nitrogen, ammonia total [as N]30-day average≤ 35 mg/LOct001
Nitrogen, ammonia total [as N]30-day average≤ 65 mg/LSep001
Nitrogen, ammonia total [as N]30-day average≤ 21 mg/LNov001
Nitrogen, ammonia total [as N]daily maximum≤ 48 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 26 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 26 mg/LJan001
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LJul001
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 24 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 26 mg/LDec001
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 21 mg/LNov001
Nitrogen, ammonia total [as N]rolling average≤ 3.9 mg/LJan001
Nitrogen, ammonia total [as N]rolling average≤ 5.2 mg/LOct001
Nitrogen, ammonia total [as N]rolling average≤ 24 mg/LAug001
Nitrogen, ammonia total [as N]rolling average≤ 20 mg/LSep001
Nitrogen, ammonia total [as N]rolling average≤ 4.9 mg/LMar001
Nitrogen, ammonia total [as N]rolling average≤ 3.3 mg/LNov001
Nitrogen, ammonia total [as N]rolling average≤ 7.8 mg/LMay001
Nitrogen, ammonia total [as N]rolling average≤ 4.5 mg/LFeb001
Nitrogen, ammonia total [as N]rolling average≤ 4.9 mg/LApr001
Nitrogen, ammonia total [as N]rolling average≤ 65 mg/LJul001
Nitrogen, ammonia total [as N]rolling average≤ 4 mg/LDec001
Nitrogen, ammonia total [as N]rolling average≤ 40 mg/LJun001
Nitrogen, inorganic totaldaily maximumreport only (mg/L)all year001
Nitrogen, inorganic totaldaily maximum≤ 10 mg/Lall year001
Nitrogen, inorganic totalrolling averagereport only (mg/L)all year001
Nitrogen, inorganic totalrolling averagereport only (mg/L)all year001
Arsenic, total recoverable30-day averagereport only (ug/L)all year001
Arsenic, total recoverablerolling averagereport only (ug/L)all year001
Copper, potentially dissolved30-day averagereport only (ug/L)all year001
Copper, potentially dissolveddaily maximumreport only (ug/L)all year001
Copper, potentially dissolvedrolling averagereport only (ug/L)all year001
Oil and greaseinstantaneous maximum≤ 10 mg/Lall year001
Flow, in conduit or thru treatment plant30-day average≤ .032 MGDall year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residual30-day average≤ .077 mg/Lall year001
Chlorine, total residualinstantaneous maximum≤ .019 mg/Lall year001
Chlorine, total residualrolling average≤ .012 mg/Lall year001
E. coli30-day geometric mean≤ 876 #/100mLall year001
E. colimaximum 7-day geometric mean≤ 1752 #/100mLall year001
E. colirolling average≤ 127 #/100mLall year001
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 (abst=0;prst=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.

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Your permit document is the final word. As JSON: /api/v1/permits/CO0047651 · MCP: https://passage-data.com/mcp