Passage Data · Check a report · Use it from your AI

Pima County - Regional Wastewater Reclamation Department

Sewage treatment plant, major discharger, Sahuarita, Arizona. NPDES permit AZ0024937, in force until Mar 23, 2031. 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 INF form A monthly (4 values), outfall 001 form Q quarterly, outfall 001 form S twice a year, outfall 001 form Y yearly
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 31 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≤ 470 kg/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 700 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≤ 470 kg/dall year001
Solids, total suspendedweekly average≤ 700 kg/dall year001
Oil & Greasemonthly average≤ 10 mg/Lall year001
Oil & Greasedaily maximum≤ 15 mg/Lall 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 average≤ 8 ug/Lall year001
Cyanide, total [as CN]daily maximum≤ 16 ug/Lall year001
Cyanide, total [as CN]monthly average≤ 120 g/dall year001
Cyanide, total [as CN]daily maximum≤ 250 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 average≤ 2 ug/Lall year001
Selenium, total recoverabledaily maximum≤ 3 ug/Lall year001
Selenium, total recoverablemonthly average≤ 30 g/dall year001
Selenium, total recoverabledaily maximum≤ 50 g/dall year001
Silver total recoverablemonthly average≤ 3.2 ug/Lall year001
Silver total recoverabledaily maximum≤ 6.4 ug/Lall year001
Silver total recoverablemonthly average≤ 50 g/dall year001
Silver total recoverabledaily maximum≤ 100 g/dall year001
Copper, total recoverablemonthly average≤ 9 ug/Lall year001
Copper, total recoverabledaily maximum≤ 19 ug/Lall year001
Copper, total recoverablemonthly average≤ 140 g/dall year001
Copper, total recoverabledaily maximum≤ 290 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≤ 140 g/dall year001
Chlorine, total residualdaily maximum≤ 280 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 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≤ .1 g/dall year001
Mercury, total recoverabledaily maximum≤ .3 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 Renewal 96Hr Acute Ceriodaphnia dubiamonthly medianreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 96Hr Acute Ceriodaphnia dubiadaily maximumreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelasmonthly median≤ 0 pass=0;fail=1all year001
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelasdaily maximum≤ 0 pass=0;fail=1all year001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiamonthly medianreport only (pass=0;fail=1)all year001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiadaily maximumreport only (pass=0;fail=1)all year001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiadaily maximumreport only (% effect)all year001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d H costatamonthly medianreport only (pass=0;fail=1)all year001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d H costatadaily maximumreport only (pass=0;fail=1)all year001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d H costatadaily maximumreport only (% effect)all year001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasmonthly median≤ 0 pass=0;fail=1all year001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasdaily maximum≤ 0 pass=0;fail=1all year001
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelasdaily maximum≤ 50 % effectall 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

· Save this facility as a site · Superfund sites nearby · Your permits on one board

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/AZ0024937 · MCP: https://passage-data.com/mcp