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Gypsum Town of

Sewage treatment plant, Eagle County, Colorado. NPDES permit CO0048830 expired Jan 31, 2026; its limits still apply. Last 12 months: over a limit 31 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (28 values), outfall 001 form Q quarterly (2 values), outfall 001 form W quarterly (2 values), outfall 001 form P yearly, outfall 300 form I quarterly
Last report on file
August 2026
Oct 2024 – Sep 2025
29 values over a limit, 0 required values missing, 1 of 25 reports late

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

All 31 values over a limit
Period endingParameterReportedLimitOver by
October 2025Acrylamide, rolling average4.13 ug/L≤ .052 ug/L7842%
October 2025Nitrogen, ammonia total [as N], rolling average5.35 mg/L≤ 3 mg/L78%
October 2025Nitrogen, nitrite total [as N], 30-day average.207 mg/L≤ .05 mg/L314%
November 2025Acrylamide, rolling average4.13 ug/L≤ .052 ug/L7842%
November 2025Nitrogen, ammonia total [as N], rolling average5.88 mg/L≤ 2.2 mg/L167%
November 2025Nitrogen, nitrite total [as N], 30-day average.192 mg/L≤ .05 mg/L284%
December 2025Acrylamide, rolling average4.13 ug/L≤ .052 ug/L7842%
December 2025Nitrogen, nitrite total [as N], 30-day average.211 mg/L≤ .05 mg/L322%
January 2026Acrylamide, rolling average4.13 ug/L≤ .052 ug/L7842%
January 2026Nitrogen, ammonia total [as N], rolling average5.16 mg/L≤ 1.9 mg/L172%
January 2026Nitrogen, nitrite total [as N], 30-day average.15 mg/L≤ .05 mg/L200%
February 2026Acrylamide, rolling average4.13 ug/L≤ .052 ug/L7842%
February 2026Nitrogen, ammonia total [as N], rolling average3.1 mg/L≤ 2 mg/L55%
February 2026Nitrogen, nitrite total [as N], 30-day average.25 mg/L≤ .05 mg/L400%
March 2026Acrylamide, rolling average4.13 ug/L≤ .052 ug/L7842%
March 2026Nitrogen, ammonia total [as N], 30-day average6.2 mg/L≤ 3 mg/L107%
March 2026Nitrogen, nitrite total [as N], 30-day average.97 mg/L≤ .05 mg/L1840%
April 2026Acrylamide, rolling average4.13 ug/L≤ .052 ug/L7842%
April 2026Nitrogen, nitrite total [as N], 30-day average.38 mg/L≤ .05 mg/L660%
May 2026Acrylamide, rolling average4.13 ug/L≤ .052 ug/L7842%
May 2026Nitrogen, ammonia total [as N], rolling average4.5 mg/L≤ 3 mg/L50%
May 2026Nitrogen, nitrite total [as N], 30-day average.18 mg/L≤ .05 mg/L260%
June 2026Acrylamide, rolling average4.13 ug/L≤ .052 ug/L7842%
June 2026Nitrogen, ammonia total [as N], rolling average4 mg/L≤ 3.2 mg/L25%
June 2026Nitrogen, nitrite total [as N], 30-day average.14 mg/L≤ .05 mg/L180%
July 2026Acrylamide, rolling average4.13 ug/L≤ .052 ug/L7842%
July 2026Nitrogen, ammonia total [as N], rolling average7.2 mg/L≤ 2.9 mg/L148%
July 2026Nitrogen, nitrite total [as N], 30-day average.17 mg/L≤ .05 mg/L240%
August 2026Acrylamide, rolling average4.13 ug/L≤ .052 ug/L7842%
August 2026Nitrogen, ammonia total [as N], rolling average8.9 mg/L≤ 2.7 mg/L230%
August 2026Nitrogen, nitrite total [as N], 30-day average.18 mg/L≤ .05 mg/L260%

Limits in force (119)

ParameterStatisticLimitMonthsOutfall
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≤ 17 mg/LApr001
Nitrogen, ammonia total [as N]30-day average≤ 13 mg/LFeb001
Nitrogen, ammonia total [as N]30-day average≤ 29 mg/LJan001
Nitrogen, ammonia total [as N]30-day average≤ 26 mg/LJun001
Nitrogen, ammonia total [as N]30-day average≤ 49 mg/LAug001
Nitrogen, ammonia total [as N]30-day average≤ 43 mg/LMay001
Nitrogen, ammonia total [as N]30-day average≤ 21 mg/LJul001
Nitrogen, ammonia total [as N]30-day average≤ 10 mg/LMar001
Nitrogen, ammonia total [as N]30-day average≤ 31 mg/LDec001
Nitrogen, ammonia total [as N]30-day average≤ 53 mg/LSep001
Nitrogen, ammonia total [as N]30-day average≤ 21 mg/LOct001
Nitrogen, ammonia total [as N]30-day average≤ 15 mg/LNov001
Nitrogen, ammonia total [as N]30-day average≤ 14 mg/LJan001
Nitrogen, ammonia total [as N]30-day average≤ 13 mg/LFeb001
Nitrogen, ammonia total [as N]30-day average≤ 3 mg/LMar001
Nitrogen, ammonia total [as N]30-day average≤ 17 mg/LApr001
Nitrogen, ammonia total [as N]30-day average≤ 27 mg/LMay001
Nitrogen, ammonia total [as N]30-day average≤ 26 mg/LJun001
Nitrogen, ammonia total [as N]30-day average≤ 21 mg/LJul001
Nitrogen, ammonia total [as N]30-day average≤ 18 mg/LAug001
Nitrogen, ammonia total [as N]30-day average≤ 18 mg/LSep001
Nitrogen, ammonia total [as N]30-day average≤ 21 mg/LOct001
Nitrogen, ammonia total [as N]30-day average≤ 15 mg/LNov001
Nitrogen, ammonia total [as N]30-day average≤ 2.6 mg/LDec001
Nitrogen, ammonia total [as N]daily maximum≤ 55 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 25 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 21 mg/LJan001
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum≤ 50 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 59 mg/LJul001
Nitrogen, ammonia total [as N]daily maximum≤ 40 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 26 mg/LDec001
Nitrogen, ammonia total [as N]daily maximum≤ 38 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 33 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 34 mg/LNov001
Nitrogen, ammonia total [as N]daily maximum≤ 21 mg/LJan001
Nitrogen, ammonia total [as N]daily maximum≤ 25 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 30 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 37 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≤ 59 mg/LJul001
Nitrogen, ammonia total [as N]daily maximum≤ 50 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 38 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 33 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 34 mg/LNov001
Nitrogen, ammonia total [as N]daily maximum≤ 26 mg/LDec001
Nitrogen, ammonia total [as N]rolling average≤ 13 mg/LOct001
Nitrogen, ammonia total [as N]rolling average≤ 8.4 mg/LJan001
Nitrogen, ammonia total [as N]rolling average≤ 10 mg/LAug001
Nitrogen, ammonia total [as N]rolling average≤ 11 mg/LSep001
Nitrogen, ammonia total [as N]rolling average≤ 8.5 mg/LNov001
Nitrogen, ammonia total [as N]rolling average≤ 16 mg/LJul001
Nitrogen, ammonia total [as N]rolling averagereport only (mg/L)Feb001
Nitrogen, ammonia total [as N]rolling averagereport only (mg/L)Apr001
Nitrogen, ammonia total [as N]rolling averagereport only (mg/L)May001
Nitrogen, ammonia total [as N]rolling averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]rolling average≤ 1.9 mg/LJan001
Nitrogen, ammonia total [as N]rolling average≤ 2 mg/LFeb001
Nitrogen, ammonia total [as N]rolling average≤ 2.6 mg/LApr001
Nitrogen, ammonia total [as N]rolling average≤ 3 mg/LMay001
Nitrogen, ammonia total [as N]rolling average≤ 3.2 mg/LJun001
Nitrogen, ammonia total [as N]rolling average≤ 2.9 mg/LJul001
Nitrogen, ammonia total [as N]rolling average≤ 2.7 mg/LAug001
Nitrogen, ammonia total [as N]rolling average≤ 2.6 mg/LSep001
Nitrogen, ammonia total [as N]rolling average≤ 3 mg/LOct001
Nitrogen, ammonia total [as N]rolling average≤ 2.2 mg/LNov001
Nitrogen, nitrite total [as N]daily maximum≤ .28 mg/Lall year001
Nitrogen, nitrite total [as N]30-day average≤ .05 mg/Lall year001
Nitrogen, inorganic totaldaily maximum≤ 45 mg/Lall year001
Cyanide, total [as CN]daily maximumreport only (ug/L)all year001
Arsenic, total recoverable30-day averagereport only (ug/L)all year001
Arsenic, total [as As]daily maximumreport only (ug/L)all year001
Cadmium, total [as Cd]daily maximumreport only (ug/L)all year001
Chromium, total [as Cr]daily maximumreport only (ug/L)all year001
Copper, total [as Cu]daily maximumreport only (ug/L)all year001
Lead, total [as Pb]daily maximumreport only (ug/L)all year001
Molybdenum, total [as Mo]daily maximumreport only (ug/L)all year001
Nickel, total [as Ni]daily maximumreport only (ug/L)all year001
Silver, total [as Ag]daily maximumreport only (ug/L)all year001
Zinc, total [as Zn]daily maximumreport only (ug/L)all year001
Selenium, total [as Se]daily maximumreport only (ug/L)all year001
Oil and greaseinstantaneous maximum≤ 10 mg/Lall year001
Total phenolsdaily maximumreport only (ug/L)all year001
Flow, in conduit or thru treatment plant30-day average≤ .96 MGDall year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residual30-day average≤ .5 mg/Lall year001
Chlorine, total residualinstantaneous maximum≤ .5 mg/Lall year001
Acrylamide30-day average≤ .46 ug/Lall year001
Acrylamiderolling averagereport only (ug/L)all year001
Acrylamiderolling average≤ .052 ug/Lall year001
E. coli30-day geometric mean≤ 1388 #/100mLall year001
E. colimaximum 7-day geometric mean≤ 2776 #/100mLall year001
Solids, total dissolved30-day averagereport only (mg/L)all year001
Solids, total dissolved30-day averagereport only (mg/L)all year001
Mercury, total [as Hg]30-day averagereport only (ug/L)all year001
Mercury, total [as Hg]daily maximumreport only (ug/L)all 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
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/CO0048830 · MCP: https://passage-data.com/mcp