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Sewage treatment plant, major discharger, Brookfield, Wisconsin. NPDES permit WI0023469 expired Dec 31, 2023; its limits still apply. Last 12 months: over a limit once (last May 2026), 239 required values missing, 10 of 28 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| May 2026 | Chlorine, total residual, weekly average | < 7.5286 | ≤ 7.5 ug/L | 0% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 8 mg/L | Jul–Sep | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 8.5 mg/L | Jun, Oct | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 9.5 mg/L | Jan, Feb | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 9 mg/L | Mar, Apr, May, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 18 mg/L | Mar | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 10 mg/L | Sep | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 7.7 mg/L | Jul | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 14 mg/L | May, Oct | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 11 mg/L | Jun | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 20 mg/L | Dec | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 19 mg/L | Nov | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 17 mg/L | Apr | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 8.8 mg/L | Aug | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 23 mg/L | Jan, Feb | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | weekly average | ≤ 18 mg/L | Mar | 001 |
| Solids, total suspended | weekly average | ≤ 17 mg/L | Apr | 001 |
| Solids, total suspended | weekly average | ≤ 11 mg/L | Jun | 001 |
| Solids, total suspended | weekly average | ≤ 23 mg/L | Jan, Feb | 001 |
| Solids, total suspended | weekly average | ≤ 19 mg/L | Nov | 001 |
| Solids, total suspended | weekly average | ≤ 10 mg/L | Jul–Sep | 001 |
| Solids, total suspended | weekly average | ≤ 14 mg/L | May, Oct | 001 |
| Solids, total suspended | weekly average | ≤ 20 mg/L | Dec | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | quarterly maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 15 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 14 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 15 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 14 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 4.4 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 11 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 7.9 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 16 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 7.3 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 5 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 12 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 11 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 7.6 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 6.2 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 6.9 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 8.1 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5.6 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.8 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 7.4 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.2 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.2 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5.8 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5 mg/L | Oct | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | quarterly maximum | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | quarterly maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ .225 mg/L | all year | 001 |
| Chloride [as Cl] | weekly average | ≤ 620 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| Chloride [as Cl] | weekly average | ≤ 590 mg/L | May–Nov | 001 |
| Chloride [as Cl] | monthly average | report only (lb/d) | Jan, Feb, Mar, Apr, Dec | 001 |
| Chloride [as Cl] | monthly average | report only (lb/d) | May–Nov | 001 |
| Chloride [as Cl] | daily maximum | report only (lb/d) | Jan, Feb, Mar, Apr, Dec | 001 |
| Chloride [as Cl] | daily maximum | report only (lb/d) | May–Nov | 001 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Nickel, total recoverable | quarterly maximum | report only (ug/L) | all year | 001 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Zinc, total recoverable | quarterly maximum | report only (ug/L) | all year | 001 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Cadmium, total recoverable | quarterly maximum | report only (ug/L) | all year | 001 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Lead, total recoverable | quarterly maximum | report only (ug/L) | all year | 001 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Chromium, total recoverable | quarterly maximum | report only (ug/L) | all year | 001 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Copper, total recoverable | quarterly maximum | report only (ug/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | weekly average | ≤ 7.5 ug/L | May–Sep | 001 |
| Chlorine, total residual | monthly average | ≤ 7.5 ug/L | May–Sep | 001 |
| Chlorine, total residual | daily maximum | ≤ 38 ug/L | May–Sep | 001 |
| Mercury, total recoverable | daily maximum | report only (ng/L) | all year | 001 |
| Mercury, total recoverable | quarterly maximum | report only (ng/L) | all year | 001 |
| Coliform, fecal general | weekly geometric mean | ≤ 972 #/100mL | May–Sep | 001 |
| Coliform, fecal general | geometric mean | ≤ 400 #/100mL | May–Sep | 001 |
| 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 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year | 701 |
| Nickel, total recoverable | quarterly maximum | report only (ug/L) | all year | 701 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 701 |
| Zinc, total recoverable | quarterly maximum | report only (ug/L) | all year | 701 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 701 |
| Cadmium, total recoverable | quarterly maximum | report only (ug/L) | all year | 701 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 701 |
| Lead, total recoverable | quarterly maximum | report only (ug/L) | all year | 701 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year | 701 |
| Chromium, total recoverable | quarterly maximum | report only (ug/L) | all year | 701 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 701 |
| Copper, total recoverable | quarterly maximum | report only (ug/L) | all year | 701 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 701 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 701 |
| Mercury, total recoverable | daily maximum | report only (ng/L) | all year | 701 |
| Mercury, total recoverable | quarterly maximum | report only (ng/L) | all year | 701 |
Cited limits by parameter: Wisconsin's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
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