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Sewage treatment plant, Hayden, Colorado. NPDES permit CO0040959 expired Dec 31, 2019; its limits still apply. Last 12 months: over a limit 12 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| May 2026 | BOD, 5-day, 20 deg. C, 30-day average | 37.6 mg/L | ≤ 30 mg/L | 25% |
| May 2026 | BOD, 5-day, 20 deg. C, maximum 7-day average | 63.8 mg/L | ≤ 45 mg/L | 42% |
| May 2026 | BOD, 5-day, percent removal, minimum | 69 % | ≥ 85 % | 107% |
| June 2026 | BOD, 5-day, 20 deg. C, 30-day average | 32.1 mg/L | ≤ 30 mg/L | 7% |
| June 2026 | BOD, 5-day, percent removal, minimum | 81.2 % | ≥ 85 % | 25% |
| July 2026 | BOD, 5-day, 20 deg. C, 30-day average | 45.8 mg/L | ≤ 30 mg/L | 53% |
| July 2026 | BOD, 5-day, 20 deg. C, maximum 7-day average | 54.2 mg/L | ≤ 45 mg/L | 20% |
| August 2026 | BOD, 5-day, 20 deg. C, 30-day average | 64.5 mg/L | ≤ 30 mg/L | 115% |
| August 2026 | BOD, 5-day, 20 deg. C, maximum 7-day average | 85.2 mg/L | ≤ 45 mg/L | 89% |
| August 2026 | BOD, 5-day, percent removal, minimum | 73.9 % | ≥ 85 % | 74% |
| September 2026 | BOD, 5-day, 20 deg. C, 30-day average | 31.6 mg/L | ≤ 30 mg/L | 5% |
| September 2026 | BOD, 5-day, 20 deg. C, maximum 7-day average | 70.2 mg/L | ≤ 45 mg/L | 56% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 45 mg/L | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 75 mg/L | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 75 mg/L | all year | 001 |
| Solids, total suspended | maximum 7-day average | ≤ 110 mg/L | all year | 001 |
| Solids, total suspended | maximum 7-day average | ≤ 110 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Jun | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Sep | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Mar | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Jul | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Jan | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Feb | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 22.6 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | May | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Apr | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Jun | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Sep | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 29 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 23.6 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Jul | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 29 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.7 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | May | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.6 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 29 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.7 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.6 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.9 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.5 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.9 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.5 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.2 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.5 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.1 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.6 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.7 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.6 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.9 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.5 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.9 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.5 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.2 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.5 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.1 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.6 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.9 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 30.5 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.9 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jul | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Feb | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jul | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Feb | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 23 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 22 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.9 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.8 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.6 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 22 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 24 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 23 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 28 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 23 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 22 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.9 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.8 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.6 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 22 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 24 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 23 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 28 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 24 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 24 mg/L | Dec | 001 |
| Iron, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Iron, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Selenium, potentially dissolvd | 30-day average | ≤ 4.6 ug/L | all year | 001 |
| Selenium, potentially dissolvd | 30-day average | ≤ 4.6 ug/L | all year | 001 |
| Selenium, potentially dissolvd | daily maximum | ≤ 18 ug/L | all year | 001 |
| Selenium, potentially dissolvd | daily maximum | ≤ 18 ug/L | all year | 001 |
| Oil and grease | instantaneous maximum | ≤ 10 mg/L | all year | 001 |
| Oil and grease | instantaneous maximum | ≤ 10 mg/L | all year | 001 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .25 MGD | all year | 001 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .75 MGD | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | 30-day average | ≤ .011 mg/L | all year | 001 |
| Chlorine, total residual | 30-day average | ≤ .011 mg/L | all year | 001 |
| Chlorine, total residual | instantaneous maximum | ≤ .019 mg/L | all year | 001 |
| Chlorine, total residual | instantaneous maximum | ≤ .019 mg/L | all year | 001 |
| E. coli | 30-day geometric mean | ≤ 126 #/100mL | all year | 001 |
| E. coli | 30-day geometric mean | ≤ 126 #/100mL | all year | 001 |
| E. coli | maximum 7-day geometric mean | ≤ 252 #/100mL | all year | 001 |
| E. coli | maximum 7-day geometric mean | ≤ 252 #/100mL | all year | 001 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 001 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 001 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 001 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 001 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Oil and grease visual | instantaneous maximum | report only (abst=0;prst=1) | all year | 001 |
| Oil and grease visual | instantaneous maximum | report only (abst=0;prst=1) | all year | 001 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | all year | 003 |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 45 mg/L | all year | 003 |
| pH | minimum | ≥ 6.5 SU | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | 30-day average | ≤ 75 mg/L | all year | 003 |
| Solids, total suspended | maximum 7-day average | ≤ 110 mg/L | all year | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 49 mg/L | Jan | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 50 mg/L | Feb | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 53 mg/L | Mar | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 67 mg/L | Apr | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 78 mg/L | May | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.9 mg/L | Jun | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.7 mg/L | Jul | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.9 mg/L | Aug | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11 mg/L | Sep | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.1 mg/L | Oct | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.3 mg/L | Nov | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 22.4 mg/L | Dec | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 63 mg/L | Jan | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 64 mg/L | Feb | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 65 mg/L | Mar | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 65 mg/L | Apr | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 65 mg/L | May | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 65 mg/L | Jun | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 65 mg/L | Jul | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 65 mg/L | Aug | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 64 mg/L | Sep | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 57 mg/L | Oct | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 64 mg/L | Nov | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 62 mg/L | Dec | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 70 mg/L | Jan | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 82 mg/L | Feb | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 104 mg/L | Mar | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 133 mg/L | Apr | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 286 mg/L | May | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 131 mg/L | Jun | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 117 mg/L | Jul | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 84 mg/L | Aug | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 65 mg/L | Sep | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 78 mg/L | Oct | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 100 mg/L | Nov | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 59 mg/L | Dec | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 65 mg/L | Jan | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 65 mg/L | Feb | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 65 mg/L | Mar | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 65 mg/L | Apr | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 65 mg/L | May | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 65 mg/L | Jun | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 65 mg/L | Jul | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 65 mg/L | Aug | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 65 mg/L | Sep | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 65 mg/L | Oct | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 65 mg/L | Nov | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 65 mg/L | Dec | 003 |
| Oil and grease | instantaneous maximum | ≤ 10 mg/L | all year | 003 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .75 MGD | all year | 003 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .6 MGD | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Chlorine, total residual | 30-day average | ≤ .5 mg/L | all year | 003 |
| Chlorine, total residual | instantaneous maximum | ≤ .5 mg/L | all year | 003 |
| E. coli | 30-day geometric mean | ≤ 2000 #/100mL | all year | 003 |
| E. coli | maximum 7-day geometric mean | ≤ 4000 #/100mL | all year | 003 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 003 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 003 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 003 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 003 |
| BOD, 5-day, percent removal | minimum | ≥ 85 % | all year | 003 |
| Oil and grease visual | instantaneous maximum | report only (abst=0;prst=1) | all year | 003 |
| Plant capacity fact. percent of capacity | 30-day average | report only (%) | all year | 300 |
| Plant capacity fact. percent of capacity | 30-day average | report only (%) | all year | 300 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year | 300 |
| BOD, 5-day, 20 deg. C | maximum 7-day average | report only (mg/L) | all year | 300 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (lb/d) | all year | 300 |
| BOD, 5-day, 20 deg. C | maximum 7-day average | report only (lb/d) | all year | 300 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 300 |
| Solids, total suspended | maximum 7-day average | report only (mg/L) | all year | 300 |
| Flow, in conduit or thru treatment plant | 30-day average | report only (MGD) | all year | 300 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 300 |
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/CO0040959 · MCP: https://passage-data.com/mcp