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Sewage treatment plant, Westfield, Iowa. NPDES permit IA0042960, in force until Dec 31, 2029. Last 12 months: over a limit 2 times (last May 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| May 2026 | Chloride [as Cl], 30-day average | 590 | ≤ 421 mg/L | 40% |
| May 2026 | E. coli, geometric mean | 147.7 | ≤ 126 #/100mL | 17% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| pH | daily minimum | ≥ 6.5 SU | all year |
| pH | daily maximum | ≤ 9 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 |
| Chloride [as Cl] | 30-day average | ≤ 421 mg/L | all year |
| Chloride [as Cl] | daily maximum | ≤ 634 mg/L | all year |
| Chloride [as Cl] | 30-day average | ≤ 618 lb/d | all year |
| Chloride [as Cl] | daily maximum | ≤ 931 lb/d | all year |
| Sulfate, total [as SO4] | 30-day average | ≤ 1527 mg/L | all year |
| Sulfate, total [as SO4] | daily maximum | ≤ 1527 mg/L | all year |
| Sulfate, total [as SO4] | 30-day average | ≤ 2241 lb/d | all year |
| Sulfate, total [as SO4] | daily maximum | ≤ 2241 lb/d | all year |
| E. coli | geometric mean | ≤ 126 #/100mL | Mar–Nov |
| 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 |
|---|---|---|---|---|
| Nitrogen, ammonia total [as N], 30-day average | 2.1 lb/d (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.1 mg/L (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2 lb/d (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.4 mg/L (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.4 mg/L (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.1 lb/d (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.7 mg/L (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4.9 lb/d (May) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.3 mg/L (May) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 5.5 lb/d (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4 mg/L (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 5.9 lb/d (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 7.9 lb/d (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 5.4 mg/L (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4 lb/d (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.7 mg/L (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 6.8 lb/d (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4.6 mg/L (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.2 mg/L (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4.7 lb/d (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.3 mg/L (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.9 lb/d (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.4 mg/L (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 5 lb/d (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.9 lb/d (May) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.8 mg/L (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4 lb/d (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.9 lb/d (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.3 mg/L (May) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 7 lb/d (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4 lb/d (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.3 mg/L (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4 mg/L (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 5.9 lb/d (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 12.6 lb/d (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 8.6 mg/L (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4 lb/d (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 29.5 lb/d (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 20.1 mg/L (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.3 mg/L (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.9 lb/d (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4 lb/d (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.8 mg/L (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4 mg/L (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 5.8 lb/d (Dec) | new | — | — |
Cited limits by parameter: Iowa's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/IA0042960 · MCP: https://passage-data.com/mcp