Passage Data · Check a report · Use it from your AI
Semiconductors And Related Devices, major discharger, St. Peters, Missouri. NPDES permit MO0000299 expired Dec 31, 2024; its limits still apply. Last 12 months: over a limit 12 times (last August 2026), 30 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Chloride, daily maximum | 333 | ≤ 301 mg/L | 11% |
| October 2025 | Chloride, monthly average | 317 | ≤ 211 mg/L | 50% |
| November 2025 | Chloride, monthly average | 217 | ≤ 211 mg/L | 3% |
| February 2026 | Chloride, daily maximum | 317 | ≤ 301 mg/L | 5% |
| February 2026 | Chloride, monthly average | 317 | ≤ 211 mg/L | 50% |
| March 2026 | Chloride, daily maximum | 391 | ≤ 301 mg/L | 30% |
| March 2026 | Chloride, monthly average | 317.5 | ≤ 211 mg/L | 50% |
| April 2026 | Chloride, daily maximum | 304 | ≤ 301 mg/L | 1% |
| April 2026 | Chloride, monthly average | 304 | ≤ 211 mg/L | 44% |
| June 2026 | Chloride, monthly average | 265 | ≤ 211 mg/L | 26% |
| July 2026 | pH, maximum | 9.2 | ≤ 9 SU | — |
| August 2026 | pH, maximum | 9.3 | ≤ 9 SU | — |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Sulfate [as S] | daily maximum | report only (mg/L) | all year | 001 |
| Sulfate [as S] | monthly average | report only (mg/L) | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 80 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 60 mg/L | all year | 001 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | ≤ 15 mg/L | all year | 001 |
| Oil and grease [soxhlet extr.] tot. | monthly average | ≤ 10 mg/L | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | 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] | monthly average | report only (mg/L) | all year | 001 |
| Fluoride, total [as F] | daily maximum | ≤ 5.5 mg/L | all year | 001 |
| Fluoride, total [as F] | monthly average | ≤ 3.6 mg/L | all year | 001 |
| Copper, total recoverable | daily maximum | ≤ 64 ug/L | all year | 001 |
| Copper, total recoverable | monthly average | ≤ 27.3 ug/L | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | ≤ 15 ug/L | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | monthly average | ≤ 7.4 ug/L | all year | 001 |
| Trichloroethylene | daily maximum | report only (ug/L) | all year | 001 |
| Trichloroethylene | monthly average | report only (ug/L) | all year | 001 |
| Chloride | daily maximum | ≤ 301 mg/L | all year | 001 |
| Chloride | monthly average | ≤ 211 mg/L | all year | 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 |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | report only (toxic) | all year | 001 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | report only (toxic) | all year | 001 |
| Chlorides + Sulfates | daily maximum | ≤ 1000 mg/L | all year | 001 |
| Chlorides + Sulfates | monthly average | ≤ 1000 mg/L | all year | 001 |
| Sulfate [as S] | daily maximum | report only (mg/L) | all year | 002 |
| Sulfate [as S] | monthly average | report only (mg/L) | all year | 002 |
| pH | minimum | ≥ 6.5 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 80 mg/L | all year | 002 |
| Solids, total suspended | monthly average | ≤ 60 mg/L | all year | 002 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | ≤ 15 mg/L | all year | 002 |
| Oil and grease [soxhlet extr.] tot. | monthly average | ≤ 10 mg/L | all year | 002 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Fluoride, total [as F] | daily maximum | ≤ 5.5 mg/L | all year | 002 |
| Fluoride, total [as F] | monthly average | ≤ 3.6 mg/L | all year | 002 |
| Copper, total recoverable | daily maximum | ≤ 64 ug/L | all year | 002 |
| Copper, total recoverable | monthly average | ≤ 27.3 ug/L | all year | 002 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | ≤ 15 ug/L | all year | 002 |
| Chromium, hexavalent dissolved [as Cr] | monthly average | ≤ 7.4 ug/L | all year | 002 |
| Trichloroethylene | daily maximum | report only (ug/L) | all year | 002 |
| Trichloroethylene | monthly average | report only (ug/L) | all year | 002 |
| Chloride | daily maximum | ≤ 301 mg/L | all year | 002 |
| Chloride | monthly average | ≤ 211 mg/L | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | report only (toxic) | all year | 002 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | report only (toxic) | all year | 002 |
| Chlorides + Sulfates | daily maximum | ≤ 1000 mg/L | all year | 002 |
| Chlorides + Sulfates | monthly average | ≤ 1000 mg/L | all year | 002 |
| Sulfate [as S] | daily maximum | report only (mg/L) | all year | 003 |
| Sulfate [as S] | monthly average | report only (mg/L) | all year | 003 |
| pH | minimum | ≥ 6.5 SU | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | daily maximum | ≤ 80 mg/L | all year | 003 |
| Solids, total suspended | monthly average | ≤ 60 mg/L | all year | 003 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | ≤ 15 mg/L | all year | 003 |
| Oil and grease [soxhlet extr.] tot. | 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] | monthly average | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 003 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | 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] | monthly average | report only (mg/L) | all year | 003 |
| Fluoride, total [as F] | daily maximum | ≤ 5.5 mg/L | all year | 003 |
| Fluoride, total [as F] | monthly average | ≤ 3.6 mg/L | all year | 003 |
| Copper, total recoverable | daily maximum | ≤ 64 ug/L | all year | 003 |
| Copper, total recoverable | monthly average | ≤ 27.3 ug/L | all year | 003 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | ≤ 15 ug/L | all year | 003 |
| Chromium, hexavalent dissolved [as Cr] | monthly average | ≤ 7.4 ug/L | all year | 003 |
| Trichloroethylene | daily maximum | report only (ug/L) | all year | 003 |
| Trichloroethylene | monthly average | report only (ug/L) | all year | 003 |
| Chloride | daily maximum | ≤ 301 mg/L | all year | 003 |
| Chloride | monthly average | ≤ 211 mg/L | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | report only (toxic) | all year | 003 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | report only (toxic) | all year | 003 |
| Chlorides + Sulfates | daily maximum | ≤ 1000 mg/L | all year | 003 |
| Chlorides + Sulfates | monthly average | ≤ 1000 mg/L | all year | 003 |
Cited limits by parameter: Missouri's rules and the federal ones.
Same industry: the 4 Electronic and Other Electrical Equipment permits in Missouri.
· Save this facility as a site · Superfund sites nearby · Your permits on one board
On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/MO0000299 · MCP: https://passage-data.com/mcp