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Crushed And Broken Limestone, Stilwell, Kansas. NPDES permit KS0083976, in force until Sep 30, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | minimum weekly average | ≥ 5 mg/L | all year | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | monthly average | report only (SU) | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4.3 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.9 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4.5 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.1 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4.5 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.9 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.1 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.2 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4.5 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.6 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.2 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.2 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.2 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.6 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.2 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.9 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.7 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.8 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.2 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.9 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.8 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.6 mg/L | Jun | 001 |
| Nitrogen, nitrite total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, nitrate total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Sulfide, total [as S] | monthly average | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 001 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | 001 |
| Arsenic, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Selenium, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Thallium, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Beryllium, total recoverable [as Be] | monthly average | report only (ug/L) | all year | 001 |
| Nickel, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Silver total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Zinc, total recoverable | monthly average | ≤ 306 ug/L | all year | 001 |
| Zinc, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Cadmium, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Lead, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Chromium, total recoverable | monthly average | ≤ 104 ug/L | all year | 001 |
| Chromium, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Copper, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Copper, total recoverable | monthly average | ≤ 25 ug/L | all year | 001 |
| Antimony, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Solids, total dissolved [TDS] | monthly average | report only (mg/L) | all year | 001 |
| Mercury, total [as Hg] | monthly average | report only (ug/L) | all year | 001 |
| IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubia | daily minimum | ≥ 38 % | all year | 001 |
| IC25 Static Renewal 7 Day Chronic Pimephales | daily minimum | ≥ 38 % | all year | 001 |
| Oxygen, dissolved [DO] | minimum weekly average | ≥ 5 mg/L | all year | 002 |
| pH | daily minimum | ≥ 6 SU | all year | 002 |
| pH | monthly average | report only (SU) | all year | 002 |
| pH | daily maximum | ≤ 9 SU | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.1 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4.5 mg/L | Jan | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Sep | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.2 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.1 mg/L | Jul | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4.3 mg/L | Mar | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4.5 mg/L | Feb | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.9 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Jun | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.9 mg/L | Nov | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.6 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4.5 mg/L | Dec | 002 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.6 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.2 mg/L | Jan | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.8 mg/L | Sep | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.8 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.7 mg/L | Jul | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.2 mg/L | Mar | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.2 mg/L | Feb | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.9 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.6 mg/L | Jun | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.2 mg/L | Nov | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.9 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.2 mg/L | Dec | 002 |
| Nitrogen, nitrite total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, nitrate total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 002 |
| Sulfide, total [as S] | monthly average | report only (mg/L) | all year | 002 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 002 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | 002 |
| Arsenic, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Selenium, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Thallium, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Beryllium, total recoverable [as Be] | monthly average | report only (ug/L) | all year | 002 |
| Nickel, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Silver total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Zinc, total recoverable | monthly average | ≤ 306 ug/L | all year | 002 |
| Zinc, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Cadmium, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Lead, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Chromium, total recoverable | monthly average | ≤ 104 ug/L | all year | 002 |
| Chromium, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Copper, total recoverable | monthly average | ≤ 25 ug/L | all year | 002 |
| Copper, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Antimony, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Solids, total dissolved [TDS] | monthly average | report only (mg/L) | all year | 002 |
| Mercury, total [as Hg] | monthly average | report only (ug/L) | all year | 002 |
| IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubia | daily minimum | ≥ 38 % | all year | 002 |
| IC25 Static Renewal 7 Day Chronic Pimephales | daily minimum | ≥ 38 % | all year | 002 |
| Oxygen, dissolved [DO] | daily maximum | report only (mg/L) | all year | 003 |
| Sulfide, total [as S] | daily maximum | report only (mg/L) | all year | 003 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 003 |
Cited limits by parameter: Kansas's rules and the federal ones.
Same industry: the 66 Mining and Quarrying of Nonmetallic Minerals permits in Kansas.
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