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Prasa Guayanilla

Sewage treatment plant, Guayanilla, Puerto Rico. NPDES permit PR0020494 expired Apr 30, 2024; its limits still apply. Last 12 months: over a limit 31 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
11 values over a limit, 0 required values missing, 0 of 17 reports late

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

All 31 values over a limit
Period endingParameterReportedLimitOver by
November 2025BOD, 5-day, 20 deg. C, monthly average27 mg/L≤ 22 mg/L23%
November 2025BOD, 5-day, percent removal, monthly average minimum76 %≥ 85 %60%
December 2025BOD, 5-day, percent removal, monthly average minimum84 %≥ 85 %7%
January 2026Surfactants [MBAS], daily maximum174 ug/L≤ 162 ug/L7%
February 2026Solids, suspended percent removal, monthly average minimum82 %≥ 85 %20%
March 2026BOD, 5-day, 20 deg. C, monthly average29 mg/L≤ 22 mg/L32%
March 2026BOD, 5-day, 20 deg. C, weekly average50 mg/L≤ 45 mg/L11%
March 2026BOD, 5-day, percent removal, monthly average minimum84 %≥ 85 %7%
March 2026Solids, suspended percent removal, monthly average minimum74 %≥ 85 %73%
April 2026BOD, 5-day, 20 deg. C, monthly average28 mg/L≤ 22 mg/L27%
May 2026Solids, suspended percent removal, monthly average minimum60 %≥ 85 %167%
June 2026Solids, suspended percent removal, monthly average minimum8 %≥ 85 %513%
June 2026Solids, total suspended, monthly average124 mg/L≤ 30 mg/L313%
June 2026Solids, total suspended, monthly average181 kg/d≤ 70.39 kg/d157%
June 2026Solids, total suspended, weekly average230 mg/L≤ 45 mg/L411%
June 2026Solids, total suspended, weekly average330 kg/d≤ 105.591 kg/d213%
July 2026BOD, 5-day, percent removal, monthly average minimum83 %≥ 85 %13%
July 2026Solids, suspended percent removal, monthly average minimum31 %≥ 85 %360%
July 2026Solids, total suspended, monthly average47 mg/L≤ 30 mg/L57%
July 2026Solids, total suspended, weekly average136 kg/d≤ 105.591 kg/d29%
July 2026Solids, total suspended, weekly average92 mg/L≤ 45 mg/L104%
August 2026BOD, 5-day, 20 deg. C, monthly average60 mg/L≤ 22 mg/L173%
August 2026BOD, 5-day, 20 deg. C, monthly average91 kg/d≤ 51.6956 kg/d76%
August 2026BOD, 5-day, 20 deg. C, weekly average106 mg/L≤ 45 mg/L136%
August 2026BOD, 5-day, 20 deg. C, weekly average163 kg/d≤ 105.59 kg/d54%
August 2026BOD, 5-day, percent removal, monthly average minimum66 %≥ 85 %127%
August 2026Solids, suspended percent removal, monthly average minimum27 %≥ 85 %387%
August 2026Solids, total suspended, monthly average100 kg/d≤ 70.39 kg/d42%
August 2026Solids, total suspended, monthly average65 mg/L≤ 30 mg/L117%
August 2026Solids, total suspended, weekly average120 mg/L≤ 45 mg/L167%
August 2026Solids, total suspended, weekly average184 kg/d≤ 105.591 kg/d74%

Limits in force (54)

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. Cmonthly average≤ 22 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 11.74 kg/dall year
BOD, 5-day, 20 deg. Cmonthly average≤ 51.6956 kg/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 105.59 kg/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 105.59 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≤ 70.39 kg/dall year
Solids, total suspendedweekly average≤ 105.591 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 maximum≤ 160 ug/Lall year
Phosphorus, total [as P]daily maximum≤ 5.77 mg/Lall year
Sulfate, total [as SO4]daily maximumreport only (mg/L)all year
Copper, total [as Cu]daily maximum≤ 15 ug/Lall year
Copper, total [as Cu]daily maximum≤ 71 ug/Lall year
Surfactants [MBAS]daily maximum≤ 100 ug/Lall year
Surfactants [MBAS]daily maximum≤ 162 ug/Lall year
Pentachlorophenoldaily maximum≤ 1 ug/Lall year
Pentachlorophenoldaily 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≤ .62 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualdaily maximum≤ 11 ug/Lall year
Sulfide-hydrogen sulfide [undissociated]daily maximum≤ 2 ug/Lall year
Whole Effluent Toxicity [WET] - P. promelasdaily minimumreport only (%)all year
Whole Effluent Toxicity [WET] - D. magnamonthly 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
Solids, total dissolveddaily maximum≤ 500 mg/Lall year
Solids, total dissolveddaily maximum≤ 745 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/PR0020494 · MCP: https://passage-data.com/mcp