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Sewage treatment plant, New Virginia, Iowa. NPDES permit IA0058891, in force until Feb 28, 2029. Last 12 months: over a limit 8 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | pH, daily maximum | 9.1 | ≤ 9 SU | — |
| January 2026 | pH, daily maximum | 9.1 | ≤ 9 SU | — |
| February 2026 | pH, daily maximum | 9.2 | ≤ 9 SU | — |
| March 2026 | pH, daily maximum | 9.2 | ≤ 9 SU | — |
| April 2026 | pH, daily maximum | 9.1 | ≤ 9 SU | — |
| May 2026 | BOD, carbonaceous [5 day, 20 C], 7-day average | 91.74 | ≤ 66 lb/d | 39% |
| May 2026 | pH, daily maximum | 9.1 | ≤ 9 SU | — |
| June 2026 | pH, daily maximum | 9.1 | ≤ 9 SU | — |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 1 mg/L | all year |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | 30-day average | report only (lb/d) | all year |
| BOD, 5-day, 20 deg. C | daily maximum | report only (lb/d) | all year |
| pH | daily minimum | ≥ 6 SU | all year |
| pH | daily maximum | ≤ 9 SU | all year |
| pH | 30-day average | report only (SU) | all year |
| pH | daily maximum | report only (SU) | all year |
| Solids, total suspended | 30-day average | ≤ 80 mg/L | all year |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | all year |
| Solids, total suspended | 30-day average | ≤ 132 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 198 lb/d | all year |
| Solids, total suspended | 30-day average | report only (mg/L) | all year |
| Solids, total suspended | daily maximum | report only (mg/L) | all year |
| Solids, total suspended | 30-day average | report only (lb/d) | all year |
| Solids, total suspended | daily maximum | report only (lb/d) | all year |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 31 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 15.5 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.3 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.2 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 39 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 20.1 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 25 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 34 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 42 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18.9 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 36 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 32 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.5 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13.3 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13.2 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 39 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20.1 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 25 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 34 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 42 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.9 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 36 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 48 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 25 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 22 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 22 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18.2 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 63 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 33 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 41 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 55 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 67 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 31 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 58 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 52 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 25 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 22 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 22 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.2 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 63 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 33 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 41 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 55 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 67 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 31 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 58 lb/d | Mar |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 41 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 66 lb/d | all year |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| E. coli, geometric mean | 126 #/100mL (Mar–Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4.1 mg/L (Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 6.8 lb/d (Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.2 mg/L (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.9 lb/d (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.9 lb/d (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.2 mg/L (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.7 mg/L (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.7 lb/d (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.5 mg/L (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 5.8 lb/d (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4.2 lb/d (Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.6 mg/L (Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.5 mg/L (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.4 lb/d (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 5.8 lb/d (Mar) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.6 mg/L (Mar) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.7 mg/L (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.8 lb/d (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.2 mg/L (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.8 lb/d (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4 lb/d (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.5 mg/L (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.1 lb/d (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.9 mg/L (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 8.8 mg/L (Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 14.4 lb/d (Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 10.9 lb/d (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 5.5 mg/L (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 8.7 lb/d (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 6.9 mg/L (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 8.3 lb/d (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 5.1 mg/L (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 7.2 mg/L (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 11.8 lb/d (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.9 mg/L (Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 8.1 lb/d (Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 6.7 mg/L (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 10.6 lb/d (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 11.9 lb/d (Mar) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 7.3 mg/L (Mar) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 8.3 lb/d (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 5.2 mg/L (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 10.9 lb/d (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 6.9 mg/L (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 5 mg/L (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 8.2 lb/d (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 6.4 mg/L (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 10.3 lb/d (May) | tighter | — | — |
Cited limits by parameter: Iowa's rules and the federal ones.
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