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Prasa Arecibo RWWTP

Sewage treatment plant, major discharger, Arecibo, Puerto Rico. NPDES permit PR0023710 expired Nov 30, 2020; its limits still apply. Last 12 months: over a limit 26 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 (37 values), form Q quarterly, form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
25 values over a limit, 5 required values missing, 0 of 17 reports late

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

All 26 values over a limit
Period endingParameterReportedLimitOver by
November 2025Coliform, fecal - % samples exceeding limit, 20% of samples100 %≤ 20 %400%
November 2025Coliform, fecal general, geometric mean> 2420 #/100mL≤ 200 #/100mL—
November 2025Enterococci - % of upper confidence limit, geometric mean100 %≤ 75 %33%
December 2025Coliform, fecal - % samples exceeding limit, 20% of samples100 %≤ 20 %400%
December 2025Coliform, fecal general, geometric mean> 2420 #/100mL≤ 200 #/100mL—
December 2025Enterococci, geometric mean> 2420 #/100mL≤ 2688 #/100mL—
December 2025Enterococci - % of upper confidence limit, geometric mean100 %≤ 75 %33%
December 2025Sulfide-hydrogen sulfide [undissociated], daily maximum319.9 ug/L≤ 131 ug/L144%
December 2025Turbidity, daily maximum70 NTU≤ 57 NTU—
January 2026BOD, 5-day, percent removal, monthly average minimum27 %≥ 30 %4%
January 2026Coliform, fecal - % samples exceeding limit, 20% of samples100 %≤ 20 %400%
January 2026Coliform, fecal general, geometric mean> 2420 #/100mL≤ 200 #/100mL—
January 2026Enterococci, geometric mean> 2420 #/100mL≤ 2688 #/100mL—
January 2026Enterococci - % of upper confidence limit, geometric mean100 %≤ 75 %33%
February 2026Coliform, fecal - % samples exceeding limit, 20% of samples100 %≤ 20 %400%
February 2026Coliform, fecal general, geometric mean> 2420 #/100mL≤ 200 #/100mL—
February 2026Enterococci, geometric mean> 2420 #/100mL≤ 2688 #/100mL—
February 2026Enterococci - % of upper confidence limit, geometric mean100 %≤ 75 %33%
March 2026Coliform, fecal - % samples exceeding limit, 20% of samples100 %≤ 20 %400%
March 2026Coliform, fecal general, geometric mean> 2420 #/100mL≤ 200 #/100mL—
March 2026Enterococci, geometric mean> 4840 #/100mL≤ 2688 #/100mL—
March 2026Enterococci - % of upper confidence limit, geometric mean100 %≤ 75 %33%
August 2026Coliform, fecal - % samples exceeding limit, 20% of samples100 %≤ 20 %400%
August 2026Coliform, fecal general, geometric mean> 2420 #/100mL≤ 200 #/100mL—
August 2026Enterococci, geometric mean> 4840 #/100mL≤ 2688 #/100mL—
August 2026Enterococci - % of upper confidence limit, geometric mean100 %≤ 75 %33%

Limits in force (53)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximum≤ 32.2 deg Call year
Turbiditydaily maximum≤ 57 NTUall year
Color [PT-CO units]daily maximumreport only (col unit (pc))all year
Oxygen, dissolved [DO]instantaneous minimumreport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 120 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 9085 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
BOD, 5-day, 20 deg. Cmonthly averagereport only (kg/d)all year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 110 mg/Lall year
Solids, total suspendedmonthly average≤ 8326 kg/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (kg/d)all year
Solids, settleabledaily maximumreport only (mL/L)all year
Oil & Greasedaily averagereport only (mg/L)all year
Oil & Greasedaily maximumreport only (mg/L)all year
Nitrogen, total [as N]daily maximum≤ 39752 ug/Lall year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (ug/L)all year
Copper, total [as Cu]daily maximum≤ 55.26 ug/Lall year
Thallium, total [as Tl]daily maximum≤ .49 ug/Lall year
Thallium, total [as Tl]daily maximum≤ 1.24 ug/Lall year
Nickel, total [as Ni]daily maximum≤ 9.48 ug/Lall year
Silver, total [as Ag]daily maximum≤ 6.61 ug/Lall year
Zinc, total [as Zn]daily maximum≤ 85.62 ug/Lall year
2-Methyl-4,6-dinitrophenoldaily maximumreport only (ug/L)all year
Coliform, fecal - % samples exceeding limit20% of samples≤ 20 %all year
2-Chlorophenoldaily maximumreport only (ug/L)all year
2,4-Dichlorophenoldaily maximumreport only (ug/L)all year
2,4,6-Trichlorophenoldaily maximumreport only (ug/L)all year
Surfactants [MBAS]daily maximum≤ 7969 ug/Lall year
Pentachlorophenoldaily maximumreport only (ug/L)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≤ 20 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualdaily maximum≤ 50 ug/Lall year
Cyanide, free availabledaily maximum≤ 10.2 ug/Lall year
Sulfide-hydrogen sulfide [undissociated]daily maximum≤ 25 ug/Lall year
Sulfide-hydrogen sulfide [undissociated]daily maximum≤ 131 ug/Lall year
Enterococci - % of upper confidence limitgeometric mean≤ 75 %all year
Whole Effluent Toxicity [WET] - Americamysis bahia (formerly Mysidopsis bahia)minimumreport only (%)all year
Enterococcigeometric meanreport only (#/100mL)all year
Enterococcigeometric mean≤ 2688 #/100mLall year
Coliform, fecal generalgeometric mean≤ 200 #/100mLall year
BOD, 5-day, percent removalmonthly average minimum≥ 30 %all year
Solids, suspended percent removalmonthly average minimum≥ 50 %all year
% Effect Static Chronic Arbacia punctulataminimumreport only (%)all year
NOAEL Static 48Hr Acute Cyprinodon variegatusminimumreport only (%)all year
NOEC Sub-Lethal Static Renewal 7 Day Chronic Cyprinodeon variegatusminimumreport only (%)all year
% Growth Reduction Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)minimumreport only (%)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/PR0023710 · MCP: https://passage-data.com/mcp