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PRASA Isabela WTP

Water Supply, major discharger, Isabela, Puerto Rico. NPDES permit PR0026638, in force until Apr 30, 2031. Last 12 months: over a limit 11 times (last August 2026), 3 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (14 values), form Q quarterly, form S twice a year, form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
8 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
November 2025Chlorine, total residual, daily maximum90 ug/L≤ 7.5 ug/L1100%
December 2025BOD, 5-day, 20 deg. C, daily maximum9.84 mg/L≤ 8.7 mg/L13%
December 2025Chlorine, total residual, daily maximum70 ug/L≤ 7.5 ug/L833%
February 2026BOD, 5-day, 20 deg. C, daily maximum9.6 mg/L≤ 8.7 mg/L10%
February 2026Phosphorus, total [as P], daily maximum1380 ug/L≤ 1000 ug/L38%
June 2026Nitrogen, total [as N], daily maximum6940 ug/L≤ 1700 ug/L308%
June 2026Phosphorus, total [as P], daily maximum1110 ug/L≤ 1000 ug/L11%
July 2026Nitrogen, total [as N], daily maximum5160 ug/L≤ 1700 ug/L204%
August 2026Ammonia & ammonium- total, daily maximum9.44 mg/L≤ .081 mg/L11554%
August 2026Nitrogen, total [as N], daily maximum9180 ug/L≤ 1700 ug/L440%
August 2026Phosphorus, total [as P], daily maximum3290 ug/L≤ 1000 ug/L229%

Limits in force (27)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximum≤ 30 deg Call year
Turbiditydaily maximum≤ 50 NTUall year
Turbiditydaily maximum≤ 181 NTUall year
Color [PT-CO units]daily maximum≤ 15 col unit (pc)all year
Color [PT-CO units]daily maximum≤ 35 col unit (pc)all year
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 8.7 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
Nitrogen, total [as N]daily maximum≤ 1700 ug/Lall year
Phosphorus, total [as P]daily maximum≤ 160 ug/Lall year
Phosphorus, total [as P]daily maximum≤ 1000 ug/Lall year
Arsenic, total [as As]daily maximum≤ 10 ug/Lall year
Arsenic, total [as As]daily maximumreport only (ug/L)all year
Copper, total [as Cu]daily maximum≤ 9.3 ug/Lall year
Copper, total [as Cu]daily maximum≤ 141.77231 ug/Lall year
Lead, total [as Pb]daily maximum≤ 3.2 ug/Lall year
Lead, total [as Pb]daily maximumreport only (ug/L)all year
Zinc, total [as Zn]daily maximum≤ 119.82 ug/Lall year
Flow, in conduit or thru treatment plantdaily maximum≤ 2.016 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
Ammonia & ammonium- totaldaily maximum≤ .081 mg/Lall 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/PR0026638 · MCP: https://passage-data.com/mcp