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Sewerage Systems, Las Animas, Colorado. NPDES permit CO0046311 expired Jul 31, 2020; its limits still apply. Last 12 months: over a limit 2 times (last December 2025), 2 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | E. coli, maximum 7-day geometric mean | 618.5 #/100mL | ≤ 252 #/100mL | 145% |
| December 2025 | Solids, suspended percent removal, monthly average minimum | 84 % | ≥ 85 % | 7% |
| 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 | maximum 7-day average | ≤ 45 mg/L | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | maximum 7-day average | ≤ 45 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 75 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 45 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 36 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 35 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 28 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 26 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 31 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 33 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 34 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 47 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 39 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 48 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | per discharge | ≤ 211 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 194 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 102 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 107 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 85 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 102 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 102 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 90 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 95 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 91 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 77 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 195 mg/L | Dec | 001 |
| Selenium, potentially dissolvd | 30-day average | report only (ug/L) | all year | 001 |
| Selenium, potentially dissolvd | 30-day average | ≤ 4.6 ug/L | all year | 001 |
| Selenium, potentially dissolvd | daily maximum | report only (ug/L) | all year | 001 |
| Selenium, potentially dissolvd | daily maximum | report only (ug/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 | ≤ .292 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 | ≤ .35 mg/L | all year | 001 |
| Chlorine, total residual | instantaneous maximum | ≤ .36 mg/L | all year | 001 |
| E. coli | 30-day geometric mean | report only (#/100mL) | all year | 001 |
| E. coli | 30-day geometric mean | ≤ 126 #/100mL | all year | 001 |
| E. coli | maximum 7-day geometric mean | report only (#/100mL) | all year | 001 |
| E. coli | maximum 7-day geometric mean | ≤ 252 #/100mL | all year | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Oil and grease visual | instantaneous maximum | report only (abst=0;prst=1) | all year | 001 |
| 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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