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Electric Services, major discharger, Gilbert, Arizona. NPDES permit AZ0023558, in force until Aug 12, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 001 |
| Oil & Grease | monthly average | ≤ 15 mg/L | all year | 001 |
| Oil & Grease | daily maximum | ≤ 20 mg/L | all year | 001 |
| Cyanide, total [as CN] | monthly average | report only (ug/L) | all year | 001 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 001 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Arsenic, total recoverable | monthly average | ≤ 120 ug/L | all year | 001 |
| Arsenic, total recoverable | daily maximum | ≤ 250 ug/L | all year | 001 |
| Selenium, total recoverable | monthly average | ≤ 2 ug/L | all year | 001 |
| Selenium, total recoverable | daily maximum | ≤ 3 ug/L | all year | 001 |
| Chromium, total [as Cr] | monthly average | ≤ 200 ug/L | all year | 001 |
| Chromium, total [as Cr] | daily maximum | ≤ 200 ug/L | all year | 001 |
| Nickel, total recoverable | monthly average | ≤ 170 ug/L | all year | 001 |
| Nickel, total recoverable | daily maximum | ≤ 330 ug/L | all year | 001 |
| Zinc, total recoverable | monthly average | ≤ 1000 ug/L | all year | 001 |
| Zinc, total recoverable | daily maximum | ≤ 1000 ug/L | all year | 001 |
| Copper, total recoverable | monthly average | ≤ 30 ug/L | all year | 001 |
| Copper, total recoverable | daily maximum | ≤ 61 ug/L | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | monthly average | ≤ 8 ug/L | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | ≤ 16 ug/L | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | monthly average | ≤ 9 ug/L | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ 18 ug/L | all year | 001 |
| Chlorine, free available | monthly average | ≤ .2 mg/L | all year | 001 |
| Chlorine, free available | daily maximum | ≤ .5 mg/L | all year | 001 |
| Mercury, total recoverable | monthly average | ≤ .01 ug/L | all year | 001 |
| Mercury, total recoverable | daily maximum | ≤ .02 ug/L | all year | 001 |
| Pass/Fail Static Renewal 96Hr Acute Ceriodaphnia dubia | monthly median | report only (pass=0;fail=1) | all year | 001 |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | monthly median | report only (pass=0;fail=1) | all year | 001 |
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | monthly median | report only (tox chronic) | all year | 001 |
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | daily maximum | report only (tox chronic) | all year | 001 |
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | monthly median | report only (tox chronic) | all year | 001 |
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | daily maximum | report only (tox chronic) | all year | 001 |
| TU Static Renewal 7-Day Chronic Pimphales promelas | monthly median | report only (tox chronic) | all year | 001 |
| TU Static Renewal 7-Day Chronic Pimphales promelas | daily maximum | report only (tox chronic) | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 005 |
| pH | maximum | ≤ 9 SU | all year | 005 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 005 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 005 |
| Oil & Grease | monthly average | ≤ 15 mg/L | all year | 005 |
| Oil & Grease | daily maximum | ≤ 20 mg/L | all year | 005 |
| Cyanide, total [as CN] | monthly average | report only (ug/L) | all year | 005 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 005 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 005 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 005 |
| Iron, total recoverable | monthly average | ≤ 800 ug/L | all year | 005 |
| Iron, total recoverable | daily maximum | ≤ 2000 ug/L | all year | 005 |
| Selenium, total recoverable | monthly average | ≤ 2 ug/L | all year | 005 |
| Selenium, total recoverable | daily maximum | ≤ 3 ug/L | all year | 005 |
| Chromium, total [as Cr] | monthly average | ≤ 200 ug/L | all year | 005 |
| Chromium, total [as Cr] | daily maximum | ≤ 200 ug/L | all year | 005 |
| Zinc, total recoverable | monthly average | ≤ 1000 ug/L | all year | 005 |
| Zinc, total recoverable | daily maximum | ≤ 1000 ug/L | all year | 005 |
| Chromium, hexavalent dissolved [as Cr] | monthly average | ≤ 8 ug/L | all year | 005 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | ≤ 16 ug/L | all year | 005 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 005 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 005 |
| Chlorine, total residual | monthly average | ≤ 9 ug/L | all year | 005 |
| Chlorine, total residual | daily maximum | ≤ 18 ug/L | all year | 005 |
| Chlorine, free available | monthly average | ≤ .2 mg/L | all year | 005 |
| Chlorine, free available | daily maximum | ≤ .5 mg/L | all year | 005 |
| Mercury, total recoverable | monthly average | ≤ .01 ug/L | all year | 005 |
| Mercury, total recoverable | daily maximum | ≤ .02 ug/L | all year | 005 |
| Pass/Fail Static Renewal 96Hr Acute Ceriodaphnia dubia | monthly median | report only (pass=0;fail=1) | all year | 005 |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | monthly median | report only (pass=0;fail=1) | all year | 005 |
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | monthly median | report only (tox chronic) | all year | 005 |
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | daily maximum | report only (tox chronic) | all year | 005 |
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | monthly median | report only (tox chronic) | all year | 005 |
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | daily maximum | report only (tox chronic) | all year | 005 |
| TU Static Renewal 7-Day Chronic Pimphales promelas | monthly median | report only (tox chronic) | all year | 005 |
| TU Static Renewal 7-Day Chronic Pimphales promelas | daily maximum | report only (tox chronic) | all year | 005 |
| pH | minimum | ≥ 6.5 SU | all year | 021 |
| pH | maximum | ≤ 9 SU | all year | 021 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 021 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 021 |
| Oil & Grease | monthly average | ≤ 15 mg/L | all year | 021 |
| Oil & Grease | daily maximum | ≤ 20 mg/L | all year | 021 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 021 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 021 |
| Selenium, total recoverable | monthly average | ≤ 20 ug/L | all year | 021 |
| Selenium, total recoverable | daily maximum | ≤ 40 ug/L | all year | 021 |
| Boron, total recoverable | monthly average | ≤ 1000 ug/L | all year | 021 |
| Boron, total recoverable | daily maximum | ≤ 2000 ug/L | all year | 021 |
| Chromium, total [as Cr] | monthly average | ≤ 200 ug/L | all year | 021 |
| Chromium, total [as Cr] | daily maximum | ≤ 200 ug/L | all year | 021 |
| Zinc, total recoverable | monthly average | ≤ 1000 ug/L | all year | 021 |
| Zinc, total recoverable | daily maximum | ≤ 1000 ug/L | all year | 021 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 021 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 021 |
| Chlorine, free available | monthly average | report only (mg/L) | all year | 021 |
| Chlorine, free available | daily maximum | report only (mg/L) | all year | 021 |
Cited limits by parameter: Arizona's rules and the federal ones.
Same industry: the 7 Electric Services permits in Arizona.
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