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Prasa Isabela

Sewage treatment plant, major discharger, Isabela, Puerto Rico. NPDES permit PR0022250 expired Sep 30, 2023; its limits still apply. Last 12 months: over a limit 5 times (last April 2026), 1 of 16 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (30 values), form Q quarterly (1 value), form Y yearly (2 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 1 of 17 reports late

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

Period endingParameterReportedLimitOver by
April 2026BOD, 5-day, 20 deg. C, monthly average229 kg/d≤ 227 kg/d1%
April 2026BOD, 5-day, 20 deg. C, monthly average41 mg/L≤ 30 mg/L37%
April 2026BOD, 5-day, 20 deg. C, weekly average119 mg/L≤ 45 mg/L164%
April 2026BOD, 5-day, 20 deg. C, weekly average672 kg/d≤ 341 kg/d97%
April 2026BOD, 5-day, percent removal, monthly average minimum79 %≥ 85 %40%

Limits in force (40)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximum≤ 32.2 deg Call year
Turbiditydaily maximum≤ 10 NTUall year
Turbiditydaily maximum≤ 94 NTUall year
Color [PT-CO units]daily maximumreport only (col unit (pc))all year
Oxygen, dissolved [DO]instantaneous minimum≥ 5 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≤ 227 kg/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 341 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≤ 227 kg/dall year
Solids, total suspendedweekly average≤ 341 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
Copper, total [as Cu]daily maximum≤ 148 ug/Lall 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≤ 2 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≤ 16 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
Mercury, total [as Hg]daily maximum≤ .051 ug/Lall 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/PR0022250 · MCP: https://passage-data.com/mcp