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Sewerage Systems, Tucson, Arizona. NPDES permit AZ0026093, in force until Aug 21, 2027. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year |
| Oxygen, dissolved [DO] | daily maximum | report only (mg/L) | all year |
| pH | minimum | ≥ 6.5 SU | all year |
| pH | minimum | report only (SU) | all year |
| pH | maximum | ≤ 9 SU | all year |
| pH | maximum | report only (SU) | all year |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year |
| Cyanide, total [as CN] | monthly average | ≤ 8 ug/L | all year |
| Cyanide, total [as CN] | daily maximum | ≤ 16 ug/L | all year |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year |
| Sulfide, total [as S] | daily maximum | report only (mg/L) | all year |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year |
| Iron, total recoverable | monthly average | ≤ 800 ug/L | all year |
| Iron, total recoverable | daily maximum | ≤ 2000 ug/L | all year |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year |
| Selenium, total recoverable | monthly average | ≤ 2 ug/L | all year |
| Selenium, total recoverable | daily maximum | ≤ 3 ug/L | all year |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year |
| Thallium, total recoverable | daily maximum | report only (ug/L) | all year |
| Beryllium, total recoverable [as Be] | daily maximum | report only (ug/L) | all year |
| Chromium, total [as Cr] | daily maximum | report only (ug/L) | all year |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year |
| Silver total recoverable | daily maximum | report only (ug/L) | all year |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | report only (ug/L) | all year |
| Antimony, total recoverable | daily maximum | report only (ug/L) | all year |
| Tetrachloroethylene | monthly average | report only (ug/L) | all year |
| Tetrachloroethylene | daily maximum | ≤ 5 ug/L | all year |
| Tetrachloroethylene | daily maximum | report only (ug/L) | all year |
| Vinyl chloride | monthly average | report only (ug/L) | all year |
| Vinyl chloride | daily maximum | ≤ 2 ug/L | all year |
| Vinyl chloride | daily maximum | report only (ug/L) | all year |
| Trichloroethylene | monthly average | report only (ug/L) | all year |
| Trichloroethylene | daily maximum | ≤ 5 ug/L | all year |
| Trichloroethylene | daily maximum | report only (ug/L) | all year |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Mercury, total recoverable | monthly average | ≤ .01 ug/L | all year |
| Mercury, total recoverable | daily maximum | ≤ .02 ug/L | all year |
| Mercury, total recoverable | daily maximum | report only (ug/L) | all year |
| cis-1,2-Dichloroethylene | monthly average | report only (ug/L) | all year |
| cis-1,2-Dichloroethylene | daily maximum | ≤ 70 ug/L | all year |
| cis-1,2-Dichloroethylene | daily maximum | report only (ug/L) | all year |
| Pass/Fail Static 48Hr Acute Ceriodaphnia dubia | monthly median | report only (pass=0;fail=1) | all year |
| Pass/Fail Static 96 Hr Acute Pimephales Promelas | monthly median | report only (pass=0;fail=1) | all year |
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | monthly median | report only (tox chronic) | all year |
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | daily maximum | report only (tox chronic) | all year |
| Static 7Day Chronic Pimephales Promelas | monthly median | report only (tox chronic) | all year |
| Static 7Day Chronic Pimephales Promelas | daily maximum | report only (tox chronic) | all year |
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | monthly median | report only (tox chronic) | all year |
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | daily maximum | report only (tox chronic) | all year |
Cited limits by parameter: Arizona's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/AZ0026093 · MCP: https://passage-data.com/mcp