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PRASA Las Marias Potable Water Filtration Plant

Water Supply, Las Marias, Puerto Rico. NPDES permit PR0026930 expired Jan 31, 2023; its limits still apply. Last 12 months: over a limit 4 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (9 values), form Q quarterly, form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 17 reports late

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

Period endingParameterReportedLimitOver by
October 2025Phosphorus, total [as P], daily maximum190 ug/L≤ 160 ug/L19%
November 2025Copper, total [as Cu], daily maximum9.57 ug/L≤ 8 ug/L20%
May 2026Copper, total [as Cu], daily maximum18.2 ug/L≤ 8 ug/L128%
July 2026Copper, total [as Cu], daily maximum10.42 ug/L≤ 8 ug/L30%

Limits in force (15)

ParameterStatisticLimitMonths
Turbiditydaily maximum≤ 50 NTUall year
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 26 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Phosphorus, total [as P]daily maximum≤ 160 ug/Lall year
Sulfate, total [as SO4]daily maximumreport only (mg/L)all year
Copper, total [as Cu]daily maximum≤ 8 ug/Lall year
Flow, in conduit or thru treatment plantdaily maximum≤ .5184 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 maximumreport only (ug/L)all year
Whole Effluent Toxicity [WET] - P. promelasminimumreport only (%)all year
Whole Effluent Toxicity [WET] - D. magnaminimumreport only (%)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.

Same industry: the 108 Water Supply permits in Puerto Rico.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/PR0026930 · MCP: https://passage-data.com/mcp