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Prasa Guayama Regional WWTP

Sewage treatment plant, major discharger, Guayama, Puerto Rico. NPDES permit PR0025445 expired Oct 31, 2024; its limits still apply. Last 12 months: over a limit 101 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
102 values over a limit, 0 required values missing, 0 of 17 reports late

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

All 101 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, 5-day, 20 deg. C, monthly average43 mg/L≤ 30 mg/L43%
October 2025BOD, 5-day, 20 deg. C, weekly average92 mg/L≤ 45 mg/L104%
October 2025BOD, 5-day, percent removal, monthly average minimum33 %≥ 85 %347%
October 2025Oxygen, dissolved [DO], instantaneous minimum.3 mg/L≥ 2.5 mg/L88%
October 2025Solids, suspended percent removal, monthly average minimum69 %≥ 85 %107%
October 2025Solids, total suspended, monthly average36 mg/L≤ 30 mg/L20%
October 2025Solids, total suspended, weekly average55 mg/L≤ 45 mg/L22%
October 2025Sulfide-hydrogen sulfide [undissociated], daily maximum47 ug/L≤ 2 ug/L2250%
October 2025pH, minimum6.7 SU≥ 7.3 SU—
November 2025BOD, 5-day, 20 deg. C, monthly average51 mg/L≤ 30 mg/L70%
November 2025BOD, 5-day, 20 deg. C, weekly average62 mg/L≤ 45 mg/L38%
November 2025BOD, 5-day, percent removal, monthly average minimum48 %≥ 85 %247%
November 2025Oxygen, dissolved [DO], instantaneous minimum.3 mg/L≥ 2.5 mg/L88%
November 2025Solids, suspended percent removal, monthly average minimum36 %≥ 85 %327%
November 2025Solids, total suspended, monthly average58 mg/L≤ 30 mg/L93%
November 2025Solids, total suspended, weekly average92 mg/L≤ 45 mg/L104%
November 2025Turbidity, daily maximum70 NTU≤ 50 NTU—
November 2025pH, minimum6.8 SU≥ 7.3 SU—
December 2025BOD, 5-day, 20 deg. C, monthly average59 mg/L≤ 30 mg/L97%
December 2025BOD, 5-day, 20 deg. C, weekly average72 mg/L≤ 45 mg/L60%
December 2025BOD, 5-day, percent removal, monthly average minimum0 %≥ 85 %567%
December 2025Oxygen, dissolved [DO], instantaneous minimum.2 mg/L≥ 2.5 mg/L92%
December 2025Solids, suspended percent removal, monthly average minimum37 %≥ 85 %320%
December 2025Solids, total suspended, monthly average45 mg/L≤ 30 mg/L50%
December 2025Solids, total suspended, weekly average64 mg/L≤ 45 mg/L42%
December 2025Turbidity, daily maximum55 NTU≤ 50 NTU—
December 2025pH, minimum6.7 SU≥ 7.3 SU—
January 2026BOD, 5-day, 20 deg. C, monthly average66 mg/L≤ 30 mg/L120%
January 2026BOD, 5-day, 20 deg. C, weekly average104 mg/L≤ 45 mg/L131%
January 2026BOD, 5-day, 20 deg. C, weekly average1863 kg/d≤ 1703 kg/d9%
January 2026BOD, 5-day, percent removal, monthly average minimum21 %≥ 85 %427%
January 2026Oxygen, dissolved [DO], instantaneous minimum.2 mg/L≥ 2.5 mg/L92%
January 2026Solids, suspended percent removal, monthly average minimum55 %≥ 85 %200%
January 2026Solids, total suspended, monthly average46 mg/L≤ 30 mg/L53%
January 2026Solids, total suspended, weekly average62 mg/L≤ 45 mg/L38%
January 2026Sulfide-hydrogen sulfide [undissociated], daily maximum3.4 ug/L≤ 2 ug/L70%
January 2026Turbidity, daily maximum70 NTU≤ 50 NTU—
January 2026pH, minimum6.7 SU≥ 7.3 SU—
February 2026BOD, 5-day, 20 deg. C, monthly average58 mg/L≤ 30 mg/L93%
February 2026BOD, 5-day, 20 deg. C, weekly average94 mg/L≤ 45 mg/L109%
February 2026BOD, 5-day, percent removal, monthly average minimum41 %≥ 85 %293%
February 2026Oxygen, dissolved [DO], instantaneous minimum.2 mg/L≥ 2.5 mg/L92%
February 2026Solids, suspended percent removal, monthly average minimum56 %≥ 85 %193%
February 2026Solids, total suspended, monthly average48 mg/L≤ 30 mg/L60%
February 2026Solids, total suspended, weekly average72 mg/L≤ 45 mg/L60%
February 2026Turbidity, daily maximum100 NTU≤ 50 NTU—
February 2026pH, minimum6.9 SU≥ 7.3 SU—
March 2026BOD, 5-day, 20 deg. C, monthly average1317 kg/d≤ 1135 kg/d16%
March 2026BOD, 5-day, 20 deg. C, monthly average76 mg/L≤ 30 mg/L153%
March 2026BOD, 5-day, 20 deg. C, weekly average92 mg/L≤ 45 mg/L104%
March 2026BOD, 5-day, percent removal, monthly average minimum29 %≥ 85 %373%
March 2026Oxygen, dissolved [DO], instantaneous minimum.2 mg/L≥ 2.5 mg/L92%
March 2026Solids, suspended percent removal, monthly average minimum66 %≥ 85 %127%
March 2026Solids, total suspended, monthly average33 mg/L≤ 30 mg/L10%
March 2026Turbidity, daily maximum140 NTU≤ 50 NTU—
March 2026pH, minimum6.9 SU≥ 7.3 SU—
April 2026BOD, 5-day, 20 deg. C, monthly average1640 kg/d≤ 1135 kg/d44%
April 2026BOD, 5-day, 20 deg. C, monthly average95 mg/L≤ 30 mg/L217%
April 2026BOD, 5-day, 20 deg. C, weekly average123 mg/L≤ 45 mg/L173%
April 2026BOD, 5-day, 20 deg. C, weekly average2339 kg/d≤ 1703 kg/d37%
April 2026BOD, 5-day, percent removal, monthly average minimum13 %≥ 85 %480%
April 2026Oxygen, dissolved [DO], instantaneous minimum.2 mg/L≥ 2.5 mg/L92%
April 2026Solids, suspended percent removal, monthly average minimum66 %≥ 85 %127%
April 2026Solids, total suspended, monthly average32 mg/L≤ 30 mg/L7%
April 2026Sulfide-hydrogen sulfide [undissociated], daily maximum191.4 ug/L≤ 2 ug/L9470%
April 2026Turbidity, daily maximum110 NTU≤ 50 NTU—
April 2026pH, minimum6.9 SU≥ 7.3 SU—
May 2026BOD, 5-day, 20 deg. C, monthly average64 mg/L≤ 30 mg/L113%
May 2026BOD, 5-day, 20 deg. C, weekly average69 mg/L≤ 45 mg/L53%
May 2026BOD, 5-day, percent removal, monthly average minimum34 %≥ 85 %340%
May 2026Oxygen, dissolved [DO], instantaneous minimum.2 mg/L≥ 2.5 mg/L92%
May 2026Solids, suspended percent removal, monthly average minimum71 %≥ 85 %93%
May 2026Solids, total suspended, monthly average32 mg/L≤ 30 mg/L7%
May 2026Turbidity, daily maximum110 NTU≤ 50 NTU—
May 2026pH, minimum6.8 SU≥ 7.3 SU—
June 2026BOD, 5-day, 20 deg. C, monthly average69 mg/L≤ 30 mg/L130%
June 2026BOD, 5-day, 20 deg. C, weekly average80 mg/L≤ 45 mg/L78%
June 2026BOD, 5-day, percent removal, monthly average minimum33 %≥ 85 %347%
June 2026Oxygen, dissolved [DO], instantaneous minimum.2 mg/L≥ 2.5 mg/L92%
June 2026Solids, suspended percent removal, monthly average minimum64 %≥ 85 %140%
June 2026Solids, total suspended, monthly average33 mg/L≤ 30 mg/L10%
June 2026Turbidity, daily maximum55 NTU≤ 50 NTU—
June 2026pH, minimum6.8 SU≥ 7.3 SU—
July 2026BOD, 5-day, 20 deg. C, monthly average60 mg/L≤ 30 mg/L100%
July 2026BOD, 5-day, 20 deg. C, weekly average62 mg/L≤ 45 mg/L38%
July 2026BOD, 5-day, percent removal, monthly average minimum37 %≥ 85 %320%
July 2026Oxygen, dissolved [DO], instantaneous minimum.2 mg/L≥ 2.5 mg/L92%
July 2026Solids, suspended percent removal, monthly average minimum57 %≥ 85 %187%
July 2026Solids, total suspended, monthly average34 mg/L≤ 30 mg/L13%
July 2026Sulfide-hydrogen sulfide [undissociated], daily maximum878.9 ug/L≤ 2 ug/L43845%
July 2026Turbidity, daily maximum110 NTU≤ 50 NTU—
July 2026pH, minimum6.7 SU≥ 7.3 SU—
August 2026BOD, 5-day, 20 deg. C, monthly average64 mg/L≤ 30 mg/L113%
August 2026BOD, 5-day, 20 deg. C, weekly average74 mg/L≤ 45 mg/L64%
August 2026BOD, 5-day, percent removal, monthly average minimum52 %≥ 85 %220%
August 2026Oxygen, dissolved [DO], instantaneous minimum.2 mg/L≥ 2.5 mg/L92%
August 2026Solids, suspended percent removal, monthly average minimum68 %≥ 85 %113%
August 2026Solids, total suspended, monthly average42 mg/L≤ 30 mg/L40%
August 2026Solids, total suspended, weekly average62 mg/L≤ 45 mg/L38%
August 2026Turbidity, daily maximum60 NTU≤ 50 NTU—
August 2026pH, minimum6.5 SU≥ 7.3 SU—

Limits in force (48)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximum≤ 32.2 deg Call year
Turbiditydaily maximum≤ 10 NTUall year
Turbiditydaily maximum≤ 50 NTUall year
Color [PT-CO units]daily maximumreport only (col unit (pc))all year
Oxygen, dissolved [DO]instantaneous minimum≥ 4 mg/Lall year
Oxygen, dissolved [DO]instantaneous minimum≥ 2.5 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≤ 1135 kg/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 1703 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≤ 1135 kg/dall year
Solids, total suspendedweekly average≤ 1703 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≤ 154.3 ug/Lall year
Silver, total [as Ag]daily maximum≤ 2.24 ug/Lall year
Surfactants [MBAS]daily maximum≤ 500 ug/Lall year
Surfactants [MBAS]daily maximum≤ 3040 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≤ 10 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualdaily maximum≤ 7.5 ug/Lall year
Chlorine, total residualdaily maximum≤ 500 mg/Lall year
Cyanide, free availabledaily maximum≤ 1 ug/Lall year
Cyanide, free availabledaily maximum≤ 13.2 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
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.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/PR0025445 · MCP: https://passage-data.com/mcp