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Sewage treatment plant, Lime Springs, Iowa. NPDES permit IA0043494, in force until Jun 30, 2029. Last 12 months: over a limit 18 times (last August 2026), 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| November 2025 | Nitrogen, ammonia total [as N], 30-day average | 4.88 | ≤ 4.6 mg/L | 6% |
| November 2025 | Nitrogen, ammonia total [as N], daily maximum | 5.13 | ≤ 4.6 mg/L | 12% |
| December 2025 | Nitrogen, ammonia total [as N], 30-day average | 8.458 | ≤ 6.2 mg/L | 36% |
| December 2025 | Nitrogen, ammonia total [as N], daily maximum | 14.33746 | ≤ 11.3 lb/d | 27% |
| December 2025 | Nitrogen, ammonia total [as N], daily maximum | 9.88 | ≤ 6.2 mg/L | 59% |
| March 2026 | Nitrogen, ammonia total [as N], 30-day average | 28.13407 | ≤ 11.9 lb/d | 136% |
| March 2026 | Nitrogen, ammonia total [as N], 30-day average | 7.54 | ≤ 6.8 mg/L | 11% |
| March 2026 | Nitrogen, ammonia total [as N], daily maximum | 52.95766 | ≤ 11.9 lb/d | 345% |
| March 2026 | Nitrogen, ammonia total [as N], daily maximum | 8.12 | ≤ 6.8 mg/L | 19% |
| April 2026 | Nitrogen, ammonia total [as N], 30-day average | 9.811884 | ≤ 9.2 lb/d | 7% |
| April 2026 | Nitrogen, ammonia total [as N], daily maximum | 17.50098 | ≤ 12.8 lb/d | 37% |
| April 2026 | Nitrogen, ammonia total [as N], daily maximum | 7.83 | ≤ 6.6 mg/L | 19% |
| April 2026 | pH, daily minimum | 6.13 | ≥ 6.5 SU | — |
| May 2026 | pH, daily maximum | 9.21 | ≤ 9 SU | — |
| August 2026 | BOD, carbonaceous [5 day, 20 C], 30-day average | 59.8812 | ≤ 58 lb/d | 3% |
| August 2026 | Nitrogen, ammonia total [as N], 30-day average | 9.967342 | ≤ 5 lb/d | 99% |
| August 2026 | Nitrogen, ammonia total [as N], daily maximum | 13.61421 | ≤ 7.8 lb/d | 75% |
| August 2026 | Nitrogen, ammonia total [as N], daily maximum | 5.3 | ≤ 4.3 mg/L | 23% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 4.8 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 | ≥ 6.5 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 | ≤ 187 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 280 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 | ≤ 4.1 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.2 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.6 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.6 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.7 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.8 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.3 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12.5 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.1 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18.4 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.8 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.2 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.2 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.6 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.6 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.1 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.3 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.5 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.1 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 23.5 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.8 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.4 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.3 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.5 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.2 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.4 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.1 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 24 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.9 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 25 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.9 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.4 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11.3 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.5 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.8 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.3 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.8 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.5 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 24 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.3 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 50 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11.9 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 | ≤ 58 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 93 lb/d | all year |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| E. coli, geometric mean | 140 #/100mL (Mar–Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.2 mg/L (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4.4 lb/d (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4.1 mg/L (Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.9 mg/L (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2 mg/L (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 9.8 lb/d (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.7 lb/d (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 6.3 lb/d (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.9 lb/d (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.1 mg/L (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.9 mg/L (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 7.1 lb/d (Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 9.3 lb/d (Mar) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4.3 mg/L (Mar) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4.5 lb/d (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 7.2 mg/L (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.8 mg/L (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.8 lb/d (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.2 mg/L (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3 lb/d (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 5 lb/d (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.5 mg/L (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 11.3 lb/d (Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 8.3 mg/L (Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.9 mg/L (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 9.3 lb/d (Mar) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 9.2 lb/d (Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 6.3 lb/d (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 46.7 lb/d (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.9 mg/L (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3 mg/L (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 20.5 mg/L (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.1 mg/L (Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.3 mg/L (Mar) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 7.6 lb/d (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.5 mg/L (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 6.3 lb/d (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 11.1 lb/d (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 5 mg/L (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 6.3 lb/d (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 7.6 lb/d (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.5 mg/L (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.9 mg/L (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 6.3 lb/d (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.5 mg/L (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 7.6 lb/d (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 19.9 lb/d (Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 8.9 mg/L (Feb) | tighter | — | — |
Cited limits by parameter: Iowa's rules and the federal ones.
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