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Water Supply, Tucson, Arizona. NPDES permit AZ0024201, in force until May 22, 2028. 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 | report only (SU) | all year |
| pH | minimum | ≥ 6.5 SU | all year |
| pH | maximum | report only (SU) | all year |
| pH | maximum | ≤ 9 SU | all year |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year |
| Arsenic, total recoverable | monthly average | report only (ug/L) | all year |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year |
| Iron, total recoverable | monthly average | report only (ug/L) | all year |
| Iron, total recoverable | daily maximum | report only (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 | report only (ug/L) | all year |
| Selenium, total recoverable | daily maximum | ≤ 3 ug/L | all year |
| Selenium, total recoverable | monthly average | ≤ .4 g/d | all year |
| Selenium, total recoverable | daily maximum | ≤ .9 g/d | all year |
| Thallium, total recoverable | monthly average | report only (ug/L) | all year |
| Thallium, 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] | monthly average | report only (ug/L) | all year |
| Beryllium, total recoverable [as Be] | 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] | monthly average | report only (ug/L) | all year |
| Chromium, total [as Cr] | daily maximum | report only (ug/L) | all year |
| Chromium, total [as Cr] | daily maximum | report only (ug/L) | all year |
| Nickel, total recoverable | monthly average | report only (ug/L) | all year |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year |
| Silver total recoverable | monthly average | report only (ug/L) | all year |
| Silver total recoverable | daily maximum | report only (ug/L) | all year |
| Silver total recoverable | daily maximum | report only (ug/L) | all year |
| Zinc, total recoverable | monthly average | ≤ 65.7 ug/L | all year |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year |
| Zinc, total recoverable | daily maximum | ≤ 184 ug/L | all year |
| Zinc, total recoverable | monthly average | ≤ 47.74 g/d | all year |
| Zinc, total recoverable | daily maximum | ≤ 47.7 g/d | 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 | monthly average | report only (ug/L) | all year |
| Copper, 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] | monthly average | report only (ug/L) | all year |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | report only (ug/L) | all year |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | report only (ug/L) | all year |
| Antimony, total recoverable | monthly average | report only (ug/L) | all year |
| Antimony, total recoverable | daily maximum | report only (ug/L) | all year |
| Antimony, total recoverable | daily maximum | report only (ug/L) | all year |
| Phosphate, ortho [as P] | daily maximum | report only (mg/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 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year |
| Mercury, total recoverable | daily maximum | report only (ug/L) | 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 |
| 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 |
| TU Static Renewal 7-Day Chronic Pimphales promelas | monthly median | report only (tox chronic) | all year |
| TU Static Renewal 7-Day Chronic Pimphales promelas | daily maximum | report only (tox chronic) | all year |
Cited limits by parameter: Arizona's rules and the federal ones.
Same industry: the 9 Water Supply permits in Arizona.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/AZ0024201 · MCP: https://passage-data.com/mcp