PRASA Las Marias Potable Water Filtration Plant

NPDES permit PR0026930 · Minor NON-POTW · administratively continued, expires 2023-01-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

This permit expired on 2023-01-31 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

EPA's record, 2025-09-01 to 2026-08-31

4values over a limit
0required values missing, on 0 form(s)
0of 16 forms filed late

Last period with anything received: 2026-07-31. Most often over: Copper, total [as Cu] (3), Phosphorus, total [as P] (1).

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among PR permits in EPA's filings — check your permit).

Limits in force (15)

OutfallParameterStatisticLimitMonths
001TurbidityDAILY MX <= 50 NTU all year
001Oxygen, dissolved [DO]INST MIN >= 5 mg/L all year
001BOD, 5-day, 20 deg. CDAILY MX <= 26 mg/L all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Phosphorus, total [as P]DAILY MX <= 160 ug/L all year
001Sulfate, total [as SO4]DAILY MX report only all year
001Copper, total [as Cu]DAILY MX <= 8 ug/L all year
001Flow, in conduit or thru treatment plantDAILY MX <= .5184 MGD all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residualDAILY MX <= 11 ug/L all year
001Cyanide, free availableDAILY MX report only all year
001Whole Effluent Toxicity [WET] - P. promelasMINIMUM report only all year
001Whole Effluent Toxicity [WET] - D. magnaMINIMUM report only all year
001Ammonia & ammonium- totalDAILY MX report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states