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Prasa Guanica

Sewage treatment plant, major discharger, Guanica, Puerto Rico. NPDES permit PR0020486, in force until Jul 31, 2030. Last 12 months: over a limit 37 times (last August 2026), 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

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

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

All 37 values over a limit
Period endingParameterReportedLimitOver by
October 2025Enterococci, 90th percentile267 #/100mL≤ 130 #/100mL105%
October 2025Enterococci, geometric mean82 #/100mL≤ 35 #/100mL134%
October 2025Nitrogen, total [as N], daily maximum5140 ug/L≤ 5000 ug/L3%
November 2025BOD, 5-day, percent removal, monthly average minimum75 %≥ 85 %67%
November 2025Enterococci, 90th percentile372.2 #/100mL≤ 130 #/100mL186%
November 2025Enterococci, geometric mean89 #/100mL≤ 35 #/100mL154%
November 2025Nitrogen, total [as N], daily maximum7050 ug/L≤ 5000 ug/L41%
December 2025Enterococci, 90th percentile1278 #/100mL≤ 130 #/100mL883%
December 2025Enterococci, geometric mean223 #/100mL≤ 35 #/100mL537%
December 2025Nitrogen, total [as N], daily maximum8890 ug/L≤ 5000 ug/L78%
December 2025Solids, suspended percent removal, monthly average minimum81 %≥ 85 %27%
January 2026Enterococci, 90th percentile1469 #/100mL≤ 130 #/100mL1030%
January 2026Enterococci, geometric mean469 #/100mL≤ 35 #/100mL1240%
January 2026Nitrogen, total [as N], daily maximum8510 ug/L≤ 5000 ug/L70%
February 2026Enterococci, 90th percentile1441 #/100mL≤ 130 #/100mL1008%
February 2026Enterococci, geometric mean473 #/100mL≤ 35 #/100mL1251%
February 2026Nitrogen, total [as N], daily maximum5360 ug/L≤ 5000 ug/L7%
March 2026Enterococci, 90th percentile767.3 #/100mL≤ 130 #/100mL490%
March 2026Enterococci, geometric mean436 #/100mL≤ 35 #/100mL1146%
April 2026Cyanide, free available, daily maximum2.8 ug/L≤ 1 ug/L180%
April 2026Enterococci, 90th percentile1733 #/100mL≤ 130 #/100mL1233%
April 2026Enterococci, geometric mean646 #/100mL≤ 35 #/100mL1746%
April 2026Nitrogen, total [as N], daily maximum7260 ug/L≤ 5000 ug/L45%
May 2026Cyanide, free available, daily maximum1.6 ug/L≤ 1 ug/L60%
May 2026Enterococci, 90th percentile1917 #/100mL≤ 130 #/100mL1375%
May 2026Enterococci, geometric mean1103 #/100mL≤ 35 #/100mL3051%
June 2026Cyanide, free available, daily maximum3.5 ug/L≤ 1 ug/L250%
June 2026Enterococci, 90th percentile1917 #/100mL≤ 130 #/100mL1375%
June 2026Enterococci, geometric mean610 #/100mL≤ 35 #/100mL1643%
July 2026Cyanide, free available, daily maximum3.1 ug/L≤ 1 ug/L210%
July 2026Enterococci, 90th percentile1414 #/100mL≤ 130 #/100mL988%
July 2026Enterococci, geometric mean325 #/100mL≤ 35 #/100mL829%
July 2026Nitrogen, total [as N], daily maximum8850 ug/L≤ 5000 ug/L77%
August 2026Cyanide, free available, daily maximum1.6 ug/L≤ 1 ug/L60%
August 2026Enterococci, 90th percentile353.5 #/100mL≤ 130 #/100mL172%
August 2026Enterococci, geometric mean204 #/100mL≤ 35 #/100mL483%
August 2026Nitrogen, total [as N], daily maximum5530 ug/L≤ 5000 ug/L11%

Limits in force (38)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximum≤ 30 deg Call year
Turbiditydaily maximum≤ 10 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≤ 232.7 kg/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 349.1 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≤ 232.7 kg/dall year
Solids, total suspendedweekly average≤ 349.1 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
Copper, total [as Cu]daily maximum≤ 3.73 ug/Lall year
Copper, total [as Cu]daily maximum≤ 34.91 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≤ 28 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
Sulfide-hydrogen sulfide [undissociated]daily maximum≤ 2 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
Enterococci90th percentile≤ 130 #/100mLall 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/PR0020486 · MCP: https://passage-data.com/mcp