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Prasa Yauco STP

Sewage treatment plant, major discharger, Yauco, Puerto Rico. NPDES permit PR0021661 expired Apr 30, 2024; its limits still apply. Last 12 months: over a limit 19 times (last August 2026), 1 of 16 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (32 values), form Q quarterly, form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
12 values over a limit, 0 required values missing, 0 of 17 reports late

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

All 19 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, 5-day, 20 deg. C, monthly average6 mg/L≤ 5 mg/L20%
October 2025Color [PT-CO units], daily maximum20 col unit (pc)≤ 15 col unit (pc)—
November 2025BOD, 5-day, 20 deg. C, monthly average10 mg/L≤ 5 mg/L100%
December 2025BOD, 5-day, 20 deg. C, monthly average7 mg/L≤ 5 mg/L40%
December 2025Copper, total [as Cu], daily maximum12.62 ug/L≤ 9.3 ug/L36%
January 2026BOD, 5-day, 20 deg. C, monthly average14 mg/L≤ 5 mg/L180%
February 2026BOD, 5-day, 20 deg. C, monthly average10 mg/L≤ 5 mg/L100%
February 2026Color [PT-CO units], daily maximum30 col unit (pc)≤ 15 col unit (pc)—
March 2026BOD, 5-day, 20 deg. C, monthly average13 mg/L≤ 5 mg/L160%
March 2026Copper, total [as Cu], daily maximum10.18 ug/L≤ 9.3 ug/L9%
March 2026Solids, total suspended, monthly average55 mg/L≤ 30 mg/L83%
March 2026Solids, total suspended, weekly average116 mg/L≤ 45 mg/L158%
April 2026BOD, 5-day, 20 deg. C, monthly average8 mg/L≤ 5 mg/L60%
May 2026BOD, 5-day, 20 deg. C, monthly average7 mg/L≤ 5 mg/L40%
June 2026Copper, total [as Cu], daily maximum10.15 ug/L≤ 9.3 ug/L9%
July 2026BOD, 5-day, 20 deg. C, monthly average8 mg/L≤ 5 mg/L60%
July 2026Copper, total [as Cu], daily maximum18.15 ug/L≤ 9.3 ug/L95%
August 2026BOD, 5-day, 20 deg. C, monthly average14 mg/L≤ 5 mg/L180%
August 2026Copper, total [as Cu], daily maximum15.23 ug/L≤ 9.3 ug/L64%

Limits in force (47)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximum≤ 32.2 deg Call year
Turbiditydaily maximum≤ 50 NTUall year
Color [PT-CO units]daily maximum≤ 15 col unit (pc)all year
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 5 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 85.25 kg/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 767.27 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≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 511 kg/dall year
Solids, total suspendedweekly average≤ 767.27 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≤ 1700 ug/Lall year
Nitrogen, total [as N]daily maximumreport only (ug/L)all year
Phosphorus, total [as P]daily maximumreport only (ug/L)all year
Sulfate, total [as SO4]daily maximumreport only (mg/L)all year
Cadmium, total [as Cd]daily maximum≤ .27 ug/Lall year
Copper, total [as Cu]daily maximum≤ 9.3 ug/Lall year
Surfactants [MBAS]daily maximum≤ 100 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≤ 4.5 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualdaily maximum≤ 11 ug/Lall year
Cyanide, free availabledaily maximum≤ 5.2 ug/Lall year
Sulfide-hydrogen sulfide [undissociated]daily maximum≤ 2 ug/Lall year
Whole Effluent Toxicity [WET] - P. promelasminimumreport only (%)all year
Whole Effluent Toxicity [WET] - D. magnaminimumreport 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
Solids, total dissolveddaily maximum≤ 500 mg/Lall year
Solids, total dissolveddaily maximum≤ 600 mg/Lall year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
Ammonia & ammonium- totaldaily maximumreport only (ug/L)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/PR0021661 · MCP: https://passage-data.com/mcp