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Sewage treatment plant, Lytton, Iowa. NPDES permit IA0020940, in force until Jun 30, 2029. Last 12 months: over a limit 16 times (last June 2026), 4 required values missing, 2 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| November 2025 | BOD, carbonaceous [5 day, 20 C], 30-day average | 26 | ≤ 25 mg/L | 4% |
| November 2025 | Chloride [as Cl], 30-day average | 1308 | ≤ 389 mg/L | 236% |
| November 2025 | Chloride [as Cl], daily maximum | 1308 | ≤ 629 mg/L | 108% |
| November 2025 | Solids, total suspended, 30-day average | 84 | ≤ 80 mg/L | 5% |
| December 2025 | BOD, carbonaceous [5 day, 20 C], 30-day average | 25.5 | ≤ 25 mg/L | 2% |
| December 2025 | Chloride [as Cl], 30-day average | 1280 | ≤ 389 mg/L | 229% |
| December 2025 | Chloride [as Cl], 30-day average | 6970.905 | ≤ 5666 lb/d | 23% |
| December 2025 | Chloride [as Cl], daily maximum | 1280 | ≤ 629 mg/L | 103% |
| May 2026 | BOD, carbonaceous [5 day, 20 C], 30-day average | 64 | ≤ 25 mg/L | 156% |
| May 2026 | BOD, carbonaceous [5 day, 20 C], 7-day average | 64 | ≤ 40 mg/L | 60% |
| May 2026 | Chloride [as Cl], 30-day average | 6312.546 | ≤ 5666 lb/d | 11% |
| May 2026 | Chloride [as Cl], 30-day average | 900 | ≤ 389 mg/L | 131% |
| May 2026 | Chloride [as Cl], daily maximum | 900 | ≤ 629 mg/L | 43% |
| June 2026 | Chloride [as Cl], 30-day average | 6544.006 | ≤ 5666 lb/d | 15% |
| June 2026 | Chloride [as Cl], 30-day average | 933 | ≤ 389 mg/L | 140% |
| June 2026 | Chloride [as Cl], daily maximum | 933 | ≤ 629 mg/L | 48% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| 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 | ≥ 6.5 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 | 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 |
| Chloride [as Cl] | 30-day average | ≤ 389 mg/L | all year |
| Chloride [as Cl] | daily maximum | ≤ 629 mg/L | all year |
| Chloride [as Cl] | 30-day average | ≤ 5666 lb/d | all year |
| Chloride [as Cl] | daily maximum | ≤ 9168 lb/d | all year |
| Sulfate, total [as SO4] | 30-day average | ≤ 2002 mg/L | all year |
| Sulfate, total [as SO4] | daily maximum | ≤ 2002 mg/L | all year |
| Sulfate, total [as SO4] | 30-day average | ≤ 29183 lb/d | all year |
| Sulfate, total [as SO4] | daily maximum | ≤ 29183 lb/d | all year |
| 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 |
| 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 | 1.7 mg/L (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 25.5 lb/d (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.5 mg/L (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 51.5 lb/d (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 23.5 lb/d (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.5 mg/L (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.6 mg/L (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 37.4 lb/d (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 51.6 lb/d (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1 mg/L (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 14.4 lb/d (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.6 mg/L (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.4 mg/L (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 35.1 lb/d (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 33.9 lb/d (May) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.3 mg/L (May) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.1 mg/L (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 16 lb/d (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 59.8 lb/d (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4.1 mg/L (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 29.7 lb/d (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2 mg/L (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 15.2 lb/d (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1 mg/L (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 47.2 lb/d (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.2 mg/L (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 27.7 lb/d (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.8 mg/L (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 1.9 mg/L (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 38.8 lb/d (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 54.8 lb/d (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 18.5 mg/L (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 56 lb/d (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 269.4 lb/d (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.8 mg/L (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 38.8 lb/d (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 47.2 lb/d (May) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.2 mg/L (May) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 38.8 lb/d (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 117.6 lb/d (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 8.1 mg/L (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.7 mg/L (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 69.1 lb/d (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 27.7 lb/d (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 1.9 mg/L (Jul) | new | — | — |
Cited limits by parameter: Iowa's rules and the federal ones.
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