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PRASA Cayey Farallon WTP

Water Supply, Cayey, Puerto Rico. NPDES permit PR0026077 expired Oct 31, 2024; its limits still apply. Last 12 months: over a limit 12 times (last August 2026), 10 required values missing, 1 of 16 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: form A monthly (11 values), form Q quarterly, form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
13 values over a limit, 0 required values missing, 1 of 17 reports late

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

Period endingParameterReportedLimitOver by
October 2025BOD, 5-day, 20 deg. C, daily maximum9.72 mg/L≤ 5 mg/L94%
November 2025Copper, total [as Cu], daily maximum382.95 ug/L≤ 79.04 ug/L385%
December 2025Copper, total [as Cu], daily maximum129.54 ug/L≤ 79.04 ug/L64%
January 2026Copper, total [as Cu], daily maximum101.28 ug/L≤ 79.04 ug/L28%
January 2026Copper, total [as Cu], daily maximum101.28 ug/L≤ 79.04 ug/L28%
March 2026Copper, total [as Cu], daily maximum116.11 ug/L≤ 79.04 ug/L47%
April 2026Copper, total [as Cu], daily maximum404.41 ug/L≤ 79.04 ug/L412%
May 2026BOD, 5-day, 20 deg. C, daily maximum6.06 mg/L≤ 5 mg/L21%
May 2026Copper, total [as Cu], daily maximum353.99 ug/L≤ 79.04 ug/L348%
June 2026Copper, total [as Cu], daily maximum106.11 ug/L≤ 79.04 ug/L34%
July 2026Copper, total [as Cu], daily maximum190.18 ug/L≤ 79.04 ug/L141%
August 2026Copper, total [as Cu], daily maximum148.22 ug/L≤ 79.04 ug/L88%

Limits in force (23)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximum≤ 32.2 deg Call year
Turbiditydaily maximum≤ 50 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
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, settleabledaily maximumreport only (mL/L)all year
Copper, total [as Cu]daily maximum≤ 9.98 ug/Lall year
Copper, total [as Cu]daily maximum≤ 79.04 ug/Lall year
Lead, total [as Pb]daily maximum≤ 7.9 ug/Lall year
Lead, total [as Pb]daily maximum≤ 7.9 ug/Lall year
Pentachlorophenoldaily maximum≤ 1 ug/Lall year
Pentachlorophenoldaily maximumreport only (ug/L)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximum≤ .337 MGDall year
Chlorine, total residualdaily maximum≤ 11 ug/Lall year
Cyanide, free availabledaily maximum≤ 5.2 ug/Lall year
Solids, total dissolveddaily maximum≤ 500 mg/Lall year
Solids, total dissolveddaily maximumreport only (mg/L)all year
Mercury, total [as Hg]daily maximum≤ .05 ug/Lall year
Mercury, total [as Hg]daily maximumreport only (ug/L)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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Your permit document is the final word. As JSON: /api/v1/permits/PR0026077 · MCP: https://passage-data.com/mcp