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PRASA San Lorenzo WTP

Water Supply, San Lorenzo, Puerto Rico. NPDES permit PR0022870, in force until Feb 28, 2027. Last 12 months: over a limit 5 times (last April 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (14 values), form Q quarterly, form Y yearly
Renewal application due
Sep 1, 2026 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 17 reports late

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

Period endingParameterReportedLimitOver by
November 2025Phosphorus, total [as P], daily maximum6220 ug/L≤ 2600 ug/L139%
November 2025Turbidity, daily maximum550 NTU≤ 434 NTU—
February 2026Phosphorus, total [as P], daily maximum14810 ug/L≤ 2600 ug/L470%
February 2026Turbidity, daily maximum700 NTU≤ 434 NTU—
April 2026Phosphorus, total [as P], daily maximum3030 ug/L≤ 2600 ug/L17%

Limits in force (26)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximum≤ 30 deg Call year
Turbiditydaily maximum≤ 50 NTUall year
Turbiditydaily maximum≤ 434 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. Cdaily maximum≤ 5 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 43.42 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, settleabledaily maximumreport only (mL/L)all year
Phosphorus, total [as P]daily maximum≤ 160 ug/Lall year
Phosphorus, total [as P]daily maximum≤ 2600 ug/Lall year
Cyanide, total [as CN]daily maximum≤ 4 ug/Lall year
Cyanide, total [as CN]daily maximumreport only (ug/L)all year
Copper, total [as Cu]daily maximum≤ 5.53 ug/Lall year
Copper, total [as Cu]daily maximum≤ 300.88 ug/Lall year
Lead, total [as Pb]daily maximum≤ 1.46 ug/Lall year
Lead, total [as Pb]daily maximum≤ 7.75 ug/Lall year
Flow, in conduit or thru treatment plantdaily maximum≤ .258 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualdaily maximum≤ 11 ug/Lall year
Whole Effluent Toxicity [WET] - P. promelasminimumreport only (%)all year
Whole Effluent Toxicity [WET] - D. magnaminimumreport only (%)all year
Mercury, total [as Hg]daily maximum≤ .05 ug/Lall year
Mercury, total [as Hg]daily maximum≤ .096 ug/Lall year
Ammonia & ammonium- totaldaily maximumreport only (mg/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/PR0022870 · MCP: https://passage-data.com/mcp