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Sewage treatment plant, Oak Ridge, Missouri. NPDES permit MO0133086, in force until Aug 31, 2027. Last 12 months: over a limit 18 times (last August 2026), 1 of 17 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Nitrogen, ammonia total [as N], daily maximum | 11.3 | ≤ 8.4 mg/L | 35% |
| October 2025 | Nitrogen, ammonia total [as N], monthly average | 7.23 | ≤ 1.8 mg/L | 302% |
| November 2025 | Nitrogen, ammonia total [as N], daily maximum | 16.4 | ≤ 8.4 mg/L | 95% |
| November 2025 | Nitrogen, ammonia total [as N], monthly average | 16.4 | ≤ 2.4 mg/L | 583% |
| December 2025 | Nitrogen, ammonia total [as N], daily maximum | 15.5 | ≤ 10.1 mg/L | 53% |
| December 2025 | Nitrogen, ammonia total [as N], monthly average | 14.6 | ≤ 2.7 mg/L | 441% |
| January 2026 | Nitrogen, ammonia total [as N], daily maximum | 19.8 | ≤ 12.1 mg/L | 64% |
| January 2026 | Nitrogen, ammonia total [as N], monthly average | 19.8 | ≤ 3.1 mg/L | 539% |
| February 2026 | Nitrogen, ammonia total [as N], daily maximum | 17.1 | ≤ 12.1 mg/L | 41% |
| February 2026 | Nitrogen, ammonia total [as N], monthly average | 17.1 | ≤ 3.1 mg/L | 452% |
| March 2026 | Nitrogen, ammonia total [as N], daily maximum | 11.2 | ≤ 10.1 mg/L | 11% |
| March 2026 | Nitrogen, ammonia total [as N], monthly average | 10.34 | ≤ 2.7 mg/L | 283% |
| April 2026 | Nitrogen, ammonia total [as N], daily maximum | 12.5 | ≤ 8.4 mg/L | 49% |
| April 2026 | Nitrogen, ammonia total [as N], monthly average | 10.91 | ≤ 2.1 mg/L | 420% |
| May 2026 | Nitrogen, ammonia total [as N], monthly average | 6.24 | ≤ 2.1 mg/L | 197% |
| June 2026 | Nitrogen, ammonia total [as N], monthly average | 4.85 | ≤ 1.3 mg/L | 273% |
| July 2026 | Nitrogen, ammonia total [as N], monthly average | 4.48 | ≤ .9 mg/L | 398% |
| August 2026 | Nitrogen, ammonia total [as N], monthly average | 3.15 | ≤ .9 mg/L | 250% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | Apr–Oct | 001 |
| Oxygen, dissolved [DO] | monthly average minimum | report only (mg/L) | Apr–Oct | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | report only (mg/L) | all year | 001 |
| Oil and grease [soxhlet extr.] tot. | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.1 mg/L | Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Jul, Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Jan, Feb | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.1 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.7 mg/L | Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .9 mg/L | Jul, Aug | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.1 mg/L | Jan, Feb | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.1 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.1 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.2 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.8 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.4 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.3 mg/L | Jun | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ 18.4 ug/L | Apr–Oct | 001 |
| Chlorine, total residual | monthly average | ≤ 5.8 ug/L | Apr–Oct | 001 |
| E. coli | 7-day geometric mean | ≤ 1030 #/100mL | Apr–Oct | 001 |
| E. coli | 30-day geometric mean | ≤ 206 #/100mL | Apr–Oct | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | INF |
| Solids, total suspended | monthly average | report only (mg/L) | all year | INF |
Cited limits by parameter: Missouri's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
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