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City Of Casa Grande

Sewage treatment plant, major discharger, Casa Grande, Arizona. NPDES permit AZ0025178, in force until Sep 16, 2029. Last 12 months: over a limit 5 times (last June 2026), 3 of 43 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (48 values), outfall 001 form Q quarterly (4 values), outfall 002 form A monthly (47 values), outfall 002 form Q quarterly (4 values), outfall INF form A monthly (4 values), outfall 001 form S twice a year, and 1 more form
Last report on file
August 2026
Oct 2024 – Sep 2025
3 values over a limit, 23 required values missing, 0 of 46 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
November 2025pH, minimum6.05 SU≥ 6.5 SU—
January 2026Cyanide, total [as CN], monthly average12 ug/L≤ 8.1 ug/L48%
February 2026Cyanide, total [as CN], daily maximum16 ug/L≤ 15 ug/L7%
February 2026Cyanide, total [as CN], monthly average12.8 ug/L≤ 8.1 ug/L58%
June 2026Solids, suspended percent removal, monthly average minimum81 %≥ 85 %27%

Limits in force (119)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademonthly averagereport only (deg C)all year001
Temperature, water deg. centigradedaily maximumreport only (deg C)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 1600 kg/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 2400 kg/dall year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 1600 kg/dall year001
Solids, total suspendedweekly average≤ 2400 kg/dall year001
Oil & Greasemonthly average≤ 10 mg/Lall year001
Oil & Greasedaily maximum≤ 15 mg/Lall year001
Oil & Greasemonthly average≤ 530 kg/dall year001
Oil & Greasedaily maximum≤ 790 kg/dall year001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly averagereport only (kg/d)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (kg/d)all year001
Nitrogen, ammonia total [as N]monthly average≤ 1 Ratioall year001
Nitrogen, ammonia total [as N]daily maximum≤ 2 Ratioall year001
Cyanide, total [as CN]monthly average≤ 8.1 ug/Lall year001
Cyanide, total [as CN]daily maximum≤ 15 ug/Lall year001
Cyanide, total [as CN]monthly average≤ 430 g/dall year001
Cyanide, total [as CN]daily maximum≤ 820 g/dall year001
Sulfide, total [as S]monthly averagereport only (ug/L)all year001
Sulfide, total [as S]daily maximumreport only (ug/L)all year001
Sulfide, total [as S]monthly averagereport only (g/d)all year001
Sulfide, total [as S]daily maximumreport only (g/d)all year001
Selenium, total recoverablemonthly average≤ 2 ug/Lall year001
Selenium, total recoverabledaily maximum≤ 3 ug/Lall year001
Selenium, total recoverablemonthly average≤ 90 g/dall year001
Selenium, total recoverabledaily maximum≤ 200 g/dall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualmonthly average≤ 9 ug/Lall year001
Chlorine, total residualdaily maximum≤ 18 ug/Lall year001
Chlorine, total residualmonthly average≤ 480 g/dall year001
Chlorine, total residualdaily maximum≤ 960 g/dall year001
E. coli, colony forming units [CFU]monthly average≤ 126 CFU/100mLall year001
E. coli, colony forming units [CFU]daily maximum≤ 575 CFU/100mLall year001
Hydrogen sulfidemonthly average≤ 2 ug/Lall year001
Hydrogen sulfidedaily maximum≤ 3 ug/Lall year001
Hydrogen sulfidemonthly average≤ 90 g/dall year001
Hydrogen sulfidedaily maximum≤ 200 g/dall year001
Mercury, total recoverablemonthly average≤ .007 ug/Lall year001
Mercury, total recoverabledaily maximum≤ .02 ug/Lall year001
Mercury, total recoverablemonthly average≤ .4 g/dall year001
Mercury, total recoverabledaily maximum≤ 1 g/dall year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)monthly medianreport only (tox chronic)all year001
TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)daily maximumreport only (tox chronic)all year001
TU Static Renewal 7-Day Chronic Ceriodaphnia dubiamonthly medianreport only (tox chronic)all year001
TU Static Renewal 7-Day Chronic Ceriodaphnia dubiadaily maximumreport only (tox chronic)all year001
TU Static Renewal 7-Day Chronic Pimphales promelasmonthly medianreport only (tox chronic)all year001
TU Static Renewal 7-Day Chronic Pimphales promelasdaily maximumreport only (tox chronic)all year001
Temperature, water deg. centigrademonthly averagereport only (deg C)all year002
Temperature, water deg. centigradedaily maximumreport only (deg C)all year002
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year002
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year002
BOD, 5-day, 20 deg. Cmonthly average≤ 1600 kg/dall year002
BOD, 5-day, 20 deg. Cweekly average≤ 2400 kg/dall year002
pHminimum≥ 6.5 SUall year002
pHmaximum≤ 9 SUall year002
Solids, total suspendedmonthly average≤ 30 mg/Lall year002
Solids, total suspendedweekly average≤ 45 mg/Lall year002
Solids, total suspendedmonthly average≤ 1600 kg/dall year002
Solids, total suspendedweekly average≤ 2400 kg/dall year002
Oil & Greasemonthly average≤ 10 mg/Lall year002
Oil & Greasedaily maximum≤ 15 mg/Lall year002
Oil & Greasemonthly average≤ 530 kg/dall year002
Oil & Greasedaily maximum≤ 790 kg/dall year002
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year002
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year002
Nitrogen, ammonia total [as N]monthly averagereport only (kg/d)all year002
Nitrogen, ammonia total [as N]daily maximumreport only (kg/d)all year002
Nitrogen, ammonia total [as N]monthly average≤ 1 Ratioall year002
Nitrogen, ammonia total [as N]daily maximum≤ 2 Ratioall year002
Cyanide, total [as CN]monthly average≤ 8.1 ug/Lall year002
Cyanide, total [as CN]daily maximum≤ 15 ug/Lall year002
Cyanide, total [as CN]monthly average≤ 430 g/dall year002
Cyanide, total [as CN]daily maximum≤ 820 g/dall year002
Sulfide, total [as S]monthly averagereport only (ug/L)all year002
Sulfide, total [as S]daily maximumreport only (ug/L)all year002
Sulfide, total [as S]monthly averagereport only (g/d)all year002
Sulfide, total [as S]daily maximumreport only (g/d)all year002
Selenium, total recoverablemonthly average≤ 2 ug/Lall year002
Selenium, total recoverabledaily maximum≤ 3 ug/Lall year002
Selenium, total recoverablemonthly average≤ 90 g/dall year002
Selenium, total recoverabledaily maximum≤ 200 g/dall year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Chlorine, total residualmonthly average≤ 9 ug/Lall year002
Chlorine, total residualdaily maximum≤ 18 ug/Lall year002
Chlorine, total residualmonthly average≤ 480 g/dall year002
Chlorine, total residualdaily maximum≤ 960 g/dall year002
E. coli, colony forming units [CFU]monthly average≤ 126 CFU/100mLall year002
E. coli, colony forming units [CFU]daily maximum≤ 575 CFU/100mLall year002
Hydrogen sulfidemonthly average≤ 2 ug/Lall year002
Hydrogen sulfidedaily maximum≤ 3 ug/Lall year002
Hydrogen sulfidemonthly average≤ 90 g/dall year002
Hydrogen sulfidedaily maximum≤ 200 g/dall year002
Mercury, total recoverablemonthly average≤ .007 ug/Lall year002
Mercury, total recoverabledaily maximum≤ .02 ug/Lall year002
Mercury, total recoverablemonthly average≤ .4 g/dall year002
Mercury, total recoverabledaily maximum≤ 1 g/dall year002
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year002
Solids, suspended percent removalmonthly average minimum≥ 85 %all year002
TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)monthly medianreport only (tox chronic)all year002
TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)daily maximumreport only (tox chronic)all year002
TU Static Renewal 7-Day Chronic Ceriodaphnia dubiamonthly medianreport only (tox chronic)all year002
TU Static Renewal 7-Day Chronic Ceriodaphnia dubiadaily maximumreport only (tox chronic)all year002
TU Static Renewal 7-Day Chronic Pimphales promelasmonthly medianreport only (tox chronic)all year002
TU Static Renewal 7-Day Chronic Pimphales promelasdaily maximumreport only (tox chronic)all year002
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF
BOD, 5-day, 20 deg. Cweekly averagereport only (mg/L)all yearINF
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF
Solids, total suspendedweekly averagereport only (mg/L)all yearINF

How strict are these limits?

Cited limits by parameter: Arizona's rules and the federal ones.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/AZ0025178 · MCP: https://passage-data.com/mcp