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Prasa Mayaguez WWTP

Sewage treatment plant, major discharger, Mayaguez, Puerto Rico. NPDES permit PR0023795, in force until Jul 31, 2030. Last 12 months: no values over a limit, 1 required value missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (32 values), form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 2 required values missing, 0 of 17 reports late

Limits in force (39)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximum≤ 31.9 deg Call year
Turbiditydaily maximum≤ 26 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≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cdaily average≤ 3179 kg/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 4768 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≤ 3179 kg/dall year
Solids, total suspendedweekly average≤ 4768 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 (ug/L)all year
Nitrogen, total [as N]daily maximum≤ 36430 ug/Lall year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (ug/L)all year
Copper, total [as Cu]daily maximum≤ 19.55 ug/Lall 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≤ 500 ug/Lall year
Cyanide, free availabledaily maximum≤ 47.28 ug/Lall year
Whole Effluent Toxicity [WET] - Americamysis bahia (formerly Mysidopsis bahia)minimumreport only (%)all year
Enterococcigeometric meanreport only (#/100mL)all 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
% 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

New limits from Aug 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Chlorine, total residual, daily maximum7.5 ug/Ltighter100 ug/L (11 values)13.3×

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/PR0023795 · MCP: https://passage-data.com/mcp