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City Of Williams

Sewage treatment plant, Williams, Arizona. NPDES permit AZ0025755, in force until Oct 28, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 30 days after each period: outfall 001 form A monthly (26 values), outfall 001 form Q quarterly (4 values), outfall INF form A monthly (4 values), outfall 001 form S twice a year, outfall 001 form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 26 reports late

Limits in force (71)

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≤ 110 kg/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 170 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≤ 110 kg/dall year001
Solids, total suspendedweekly average≤ 170 kg/dall year001
Oil & Greasemonthly averagereport only (mg/L)all year001
Oil & Greasedaily maximumreport only (mg/L)all 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 (Ratio)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (Ratio)all year001
Cyanide, total [as CN]monthly average≤ 7.9 ug/Lall year001
Cyanide, total [as CN]daily maximum≤ 16 ug/Lall year001
Cyanide, total [as CN]monthly average≤ 29 g/dall year001
Cyanide, total [as CN]daily maximum≤ 59 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
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year001
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year001
Selenium, total recoverablemonthly averagereport only (ug/L)all year001
Selenium, total recoverabledaily maximumreport only (ug/L)all year001
Zinc, total recoverablemonthly average≤ 90 ug/Lall year001
Zinc, total recoverabledaily maximum≤ 140 ug/Lall year001
Zinc, total recoverablemonthly average≤ 330 g/dall year001
Zinc, total recoverabledaily maximum≤ 500 g/dall year001
Lead, total recoverablemonthly average≤ 3.1 ug/Lall year001
Lead, total recoverabledaily maximum≤ 6.4 ug/Lall year001
Lead, total recoverablemonthly average≤ 12 g/dall year001
Lead, total recoverabledaily maximum≤ 24 g/dall year001
Copper, total recoverablemonthly average≤ 6.7 ug/Lall year001
Copper, total recoverabledaily maximum≤ 16 ug/Lall year001
Copper, total recoverablemonthly average≤ 25 g/dall year001
Copper, total recoverabledaily maximum≤ 60 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≤ 33 g/dall year001
Chlorine, total residualdaily maximum≤ 67 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
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Solids, total dissolveddaily maximum≤ 400 mg/Lall year001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Hydrogen sulfidemonthly averagereport only (ug/L)all year001
Hydrogen sulfidedaily maximumreport only (ug/L)all year001
Mercury, total recoverablemonthly average≤ .008 ug/Lall year001
Mercury, total recoverabledaily maximum≤ .02 ug/Lall year001
Mercury, total recoverablemonthly average≤ .03 g/dall year001
Mercury, total recoverabledaily maximum≤ .06 g/dall year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Pass/Fail Static 96Hr Acute Ceriodaphnia Dubiamonthly medianreport only (pass=0;fail=1)all year001
Pass/Fail Static 96 Hr Acute Pimephales Promelasmonthly medianreport only (pass=0;fail=1)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 averagereport only (tox chronic)all year001
TU Static Renewal 7-Day Chronic Pimphales promelasdaily maximumreport only (tox chronic)all year001
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/AZ0025755 · MCP: https://passage-data.com/mcp