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Prasa Santa Isabel

Sewage treatment plant, major discharger, Santa Isabel, Puerto Rico. NPDES permit PR0023761 expired Nov 30, 2024; its limits still apply. Last 12 months: over a limit 9 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (31 values), form Q quarterly, form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
31 values over a limit, 0 required values missing, 1 of 17 reports late

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

Period endingParameterReportedLimitOver by
October 2025Solids, suspended percent removal, monthly average minimum83 %≥ 85 %13%
October 2025Solids, total suspended, weekly average46 mg/L≤ 45 mg/L2%
March 2026Solids, suspended percent removal, monthly average minimum83 %≥ 85 %13%
August 2026BOD, 5-day, 20 deg. C, monthly average39 mg/L≤ 30 mg/L30%
August 2026BOD, 5-day, 20 deg. C, weekly average60 mg/L≤ 45 mg/L33%
August 2026BOD, 5-day, percent removal, monthly average minimum82 %≥ 85 %20%
August 2026Solids, suspended percent removal, monthly average minimum62 %≥ 85 %153%
August 2026Solids, total suspended, monthly average45 mg/L≤ 30 mg/L50%
August 2026Solids, total suspended, weekly average84 mg/L≤ 45 mg/L87%

Limits in force (50)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximum≤ 30 deg Call year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Turbiditydaily maximum≤ 10 NTUall year
Turbiditydaily maximum≤ 83 NTUall year
Color [PT-CO units]daily maximumreport only (col unit (pc))all year
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year
Oxygen, dissolved [DO]instantaneous minimum≥ 4 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 625 kg/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 938 kg/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cweekly averagereport only (mg/L)all year
pHminimum≥ 7.3 SUall year
pHmaximum≤ 8.5 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 625 kg/dall year
Solids, total suspendedweekly geometric mean≤ 938 kg/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly averagereport only (mg/L)all year
Solids, settleabledaily maximumreport only (mL/L)all year
Oil & Greasedaily maximumreport only (mg/L)all year
Nitrogen, total [as N]daily maximum≤ 5000 ug/Lall year
Nitrogen, total [as N]daily maximumreport only (ug/L)all year
Copper, total [as Cu]daily maximum≤ 3.73 ug/Lall year
Copper, total [as Cu]daily maximum≤ 103.5 ug/Lall year
Nickel, total [as Ni]daily maximum≤ 8.28 ug/Lall year
Nickel, total [as Ni]daily maximum≤ 8.54 ug/Lall year
Silver, total [as Ag]daily maximum≤ 2.24 ug/Lall year
Silver, total [as Ag]daily maximumreport only (ug/L)all year
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximum≤ 5.5 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualdaily maximum≤ 7.5 ug/Lall year
Cyanide, free availabledaily maximum≤ 1 ug/Lall year
Cyanide, free availabledaily maximum≤ 6.6 ug/Lall year
Sulfide-hydrogen sulfide [undissociated]daily maximum≤ 2 ug/Lall year
Sulfide-hydrogen sulfide [undissociated]daily maximum≤ 3 ug/Lall year
Whole Effluent Toxicity [WET] - M. beryllinaminimumreport only (%)all year
Whole Effluent Toxicity [WET] - Americamysis bahia (formerly Mysidopsis bahia)minimumreport only (%)all year
Enterococcigeometric mean≤ 35 #/100mLall year
Enterococcigeometric meanreport only (#/100mL)all year
Enterococci90th percentile≤ 130 #/100mLall year
Enterococci90th percentilereport only (#/100mL)all year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year

How strict are these limits?

Cited limits by parameter: we hold no rule of Puerto Rico's own; the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/PR0023761 · MCP: https://passage-data.com/mcp