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Usdoi - Lower Colorado

Federal facility (Electric Services), Boulder City, Arizona. NPDES permit AZ0025160, in force until Sep 18, 2029. Last 12 months: over a limit 9 times (last August 2026), 4 required values missing, 3 of 39 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (18 values), outfall 001 form Q quarterly (8 values), outfall 002 form A monthly (12 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, 7 of 41 reports late

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

Period endingOutfallParameterReportedLimitOver by
April 2026001Nitrogen, ammonia total [as N], daily maximum2.83 Ratio≤ 2 Ratio42%
April 2026001Nitrogen, ammonia total [as N], monthly average1.45 Ratio≤ 1 Ratio45%
June 2026001Selenium, total recoverable, monthly average2.1 ug/L≤ 1 ug/L110%
July 2026002BOD, 5-day, percent removal, monthly average minimum80 %≥ 85 %33%
August 2026002BOD, 5-day, 20 deg. C, monthly average50 mg/L≤ 30 mg/L67%
August 2026002BOD, 5-day, 20 deg. C, weekly average50 mg/L≤ 45 mg/L11%
August 2026002BOD, 5-day, percent removal, monthly average minimum66.6 %≥ 85 %123%
August 2026002Solids, suspended percent removal, monthly average minimum73.1 %≥ 85 %79%
August 2026002Solids, total suspended, monthly average35 mg/L≤ 30 mg/L17%

Limits in force (82)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademonthly averagereport only (deg C)all year001
Temperature, water deg. centigradedaily maximumreport only (deg C)all year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 9 SUall year001
pHmonthly averagereport only (SU)all year001
pHdaily maximumreport only (SU)all year001
Oil & Greasemonthly average≤ 10 mg/Lall year001
Oil & Greasedaily maximum≤ 15 mg/Lall year001
Oil & Greasemonthly average≤ 2.3 kg/dall year001
Oil & Greasedaily maximum≤ 3.5 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 average≤ 1 Ratioall year001
Nitrogen, ammonia total [as N]daily maximum≤ 2 Ratioall year001
Cyanide, total [as CN]monthly averagereport only (ug/L)all year001
Cyanide, total [as CN]daily maximumreport only (ug/L)all 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
Iron, total recoverablemonthly average≤ 700 ug/Lall year001
Iron, total recoverabledaily maximum≤ 2000 ug/Lall year001
Iron, total recoverablemonthly average≤ 200 g/dall year001
Iron, total recoverabledaily maximum≤ 400 g/dall year001
Selenium, total recoverablemonthly average≤ 1 ug/Lall year001
Selenium, total recoverabledaily maximum≤ 4 ug/Lall year001
Selenium, total recoverablemonthly average≤ .3 g/dall year001
Selenium, total recoverabledaily maximum≤ .8 g/dall year001
Zinc, total recoverablemonthly average≤ 120 ug/Lall year001
Zinc, total recoverabledaily maximum≤ 230 ug/Lall year001
Zinc, total recoverablemonthly average≤ 27 g/dall year001
Zinc, total recoverabledaily maximum≤ 54 g/dall year001
Cadmium, total recoverablemonthly averagereport only (ug/L)all year001
Cadmium, total recoverabledaily maximumreport only (ug/L)all year001
Lead, total recoverablemonthly average≤ 7 ug/Lall year001
Lead, total recoverabledaily maximum≤ 14 ug/Lall year001
Lead, total recoverablemonthly average≤ 1.6 g/dall year001
Lead, total recoverabledaily maximum≤ 3.3 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≤ 17 ug/Lall year001
Chlorine, total residualmonthly average≤ 2.2 g/dall year001
Chlorine, total residualdaily maximum≤ 3.9 g/dall year001
E. coli, colony forming units [CFU]monthly average≤ 126 CFU/100mLall year001
E. coli, colony forming units [CFU]daily maximum≤ 235 CFU/100mLall year001
Solids, total dissolvedmonthly averagereport only (mg/L)all year001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Solids, total dissolvedmonthly averagereport only (mg/L)all year001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Solids, total dissolveddaily maximum≤ 907 kg/dall year001
Solids, total dissolvedmonthly averagereport only (mg/L)all 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≤ .005 ug/Lall year001
Mercury, total recoverabledaily maximum≤ .02 ug/Lall year001
Mercury, total recoverablemonthly average≤ .001 g/dall year001
Mercury, total recoverabledaily maximum≤ .004 g/dall year001
Sediment, suspendedmonthly medianreport only (mg/L)all year001
TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)monthly averagereport 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
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≤ 3.4 kg/dall year002
BOD, 5-day, 20 deg. Cweekly average≤ 5.1 kg/dall year002
Solids, total suspendedmonthly average≤ 30 mg/Lall year002
Solids, total suspendedweekly average≤ 45 mg/Lall year002
Solids, total suspendedmonthly average≤ 3.4 kg/dall year002
Solids, total suspendedweekly average≤ 5.1 kg/dall year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year002
Solids, suspended percent removalmonthly average minimum≥ 85 %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.

Same industry: the 7 Electric Services permits in Arizona.

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Your permit document is the final word. As JSON: /api/v1/permits/AZ0025160 · MCP: https://passage-data.com/mcp