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Sewage treatment plant, major discharger, Twin Lakes, Wisconsin. NPDES permit WI0021695 expired Sep 30, 2023; its limits still apply. Last 12 months: over a limit 6 times (last June 2026), 79 required values missing, 2 of 26 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Chloride [as Cl], weekly average | 672.6667 | ≤ 600 mg/L | 12% |
| November 2025 | Chloride [as Cl], weekly average | 631.25 | ≤ 600 mg/L | 5% |
| December 2025 | Chloride [as Cl], weekly average | 656 | ≤ 600 mg/L | 9% |
| February 2026 | Nitrogen, ammonia total [as N], monthly average | 8.6475 | ≤ 4.2 mg/L | 106% |
| February 2026 | Nitrogen, ammonia total [as N], weekly average | 13.0667 | ≤ 10 mg/L | 31% |
| June 2026 | Chloride [as Cl], weekly average | 640 | ≤ 600 mg/L | 7% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 7 mg/L | all year | 003 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 5 mg/L | May–Oct | 003 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 10 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 003 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 5 mg/L | May–Oct | 003 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 10 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 003 |
| pH | daily minimum | ≥ 6 SU | all year | 003 |
| pH | daily maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | weekly average | ≤ 10 mg/L | all year | 003 |
| Solids, total suspended | monthly average | ≤ 10 mg/L | all year | 003 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, total [as N] | quarterly maximum | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 10 mg/L | Jan, Feb, Mar, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 9.2 mg/L | Oct | 003 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 6.4 mg/L | Apr | 003 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 2.7 mg/L | May–Sep | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4.2 mg/L | Jan, Feb, Mar, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.7 mg/L | Oct | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.6 mg/L | Apr | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.1 mg/L | May–Sep | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Oct | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Apr | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | May–Sep | 003 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, Kjeldahl, total [as N] | quarterly maximum | report only (mg/L) | all year | 003 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrite + Nitrate total [as N] | quarterly maximum | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | monthly average | ≤ .7 mg/L | all year | 003 |
| Phosphorus, total [as P] | annual average | report only (lb/yr) | all year | 003 |
| Phosphorus, total [as P] | annual maximum | report only (lb/yr) | all year | 003 |
| Chloride [as Cl] | weekly average | ≤ 600 mg/L | all year | 003 |
| Chloride [as Cl] | monthly average | report only (lb/d) | all year | 003 |
| Chloride [as Cl] | daily maximum | report only (lb/d) | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Coliform, fecal general | weekly geometric mean | ≤ 780 #/100mL | May–Sep | 003 |
| Coliform, fecal general | geometric mean | ≤ 400 #/100mL | May–Sep | 003 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 701 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 701 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 701 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 701 |
Cited limits by parameter: Wisconsin's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/WI0021695 · MCP: https://passage-data.com/mcp