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Clean Water Act discharge permit · NPDES PR0020753

PRASA PATILLAS WWTP, Patillas, PR: NPDES PR0020753 discharge permit, effluent exceedances, inspections, penalties

PRASA PATILLAS WWTP, held by PRASA PATILLAS, holds NPDES permit PR0020753, which discharges to Rio Patillas. EPA’s file records it issued November 17, 2017 and expiring January 31, 2023. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filedPRASA PATILLAS WWTP
Permittee as filedPRASA PATILLAS
NPDES IDPR0020753
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMajor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedNovember 17, 2017
Expiration dateJanuary 31, 2023
AddressPatillas, PR 00723
Receiving waterRIO PATILLAS
Receiving water impaired303(D) Listed

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.

Pollutant or measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
Chlorine, total residual1183169April 30, 20258,355% over the limit
Solids, total suspended5231142April 30, 2026767% over the limit
BOD, 5-day, 20 deg. C10225136July 31, 202499,999% over the limit
Color [PT-CO units]2146132November 30, 2015
Phosphorus, total [as P]29580April 30, 2016897% over the limit
Solids, suspended percent removal19475May 31, 20261,147% over the limit
BOD, 5-day, percent removal19172March 31, 2026813% over the limit
Coliform, total general08471May 31, 201599,999% over the limit
Coliform, fecal general08268April 30, 201799,999% over the limit
Surfactants [MBAS]28362October 31, 201427,300% over the limit
Ammonia, unionized05553September 30, 2003173% over the limit
Mercury, total [as Hg]26747February 28, 20158,988% over the limit
Nitrogen, ammonia, total [as NH3]05044April 30, 2016389% over the limit
Enterococci45341July 31, 20262,931% over the limit
Copper, total [as Cu]25440March 31, 20151,271% over the limit
Coliform, fecal - % samples exceeding limit05140April 30, 2017400% over the limit
Oxygen, dissolved [DO]25237March 31, 201995% over the limit
Temperature, water deg. centigrade14732July 31, 2026869% over the limit
Phenolics, total recoverable03928May 31, 200645,900% over the limit
Ammonia nitrogen, total, [as N] 30 day03327May 31, 20063,121% over the limit
Arsenic, total [as As]04124March 31, 20086,567% over the limit
Oil & Grease14521May 31, 2006278% over the limit
Lead, total [as Pb]03418May 31, 2006648% over the limit
Flow, in conduit or thru treatment plant34817December 31, 2013121% over the limit
Turbidity23217October 31, 2006
Sulfide-hydrogen sulfide [undissociated]22210July 31, 202013,400% over the limit
Ammonia & ammonium- total31910March 31, 202522,196% over the limit
Nitrogen, total [as N]21810March 31, 20251,028% over the limit
Sulfide, total [as S]0218March 31, 200699,900% over the limit
Nitrite + Nitrate total [as N]0208January 31, 2008122% over the limit
Silver, total [as Ag]283April 30, 2010233% over the limit
pH2311October 31, 2022
Fluoride, total [as F]0171October 31, 2008379% over the limit
Solids, settleable1150
Cadmium, total [as Cd]1140
Zinc, total [as Zn]0100
Manganese, total [as Mn]060
Solids, total dissolved- 180 deg. C060
Solids, total dissolved250
Chromium, total [as Cr]050
Nickel, total [as Ni]050
2-Methyl-4,6-dinitrophenol050
2-Chlorophenol050
2,4-Dichlorophenol050
2,4-Dimethylphenol050
2,4-Dinitrophenol050
2,4,6-Trichlorophenol050
Phenol050
Pentachlorophenol050
Whole Effluent Toxicity [WET] - P. promelas230
Whole Effluent Toxicity [WET] - D. magna230
Whole effluent toxicity020

Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.

Inspections, violations and enforcement

DateWhat EPA recordedAgency
July 20, 2026Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangermentEP6
July 10, 2026Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangermentEP6
July 6, 2026Wet-weather SSO discharge to waters of the U.S., not permit compliant, no endangermentEP6
April 30, 2026Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangermentEP6
April 28, 2026Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangermentEP6
February 12, 2026Wet-weather SSO discharge to waters of the U.S., not permit compliant, no endangermentEP6
January 15, 2026Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangermentEP6
January 14, 2026Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangermentEP6
September 22, 2025Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
September 20, 2025Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangermentEP6
September 11, 2025Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
September 3, 2025Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangermentEP6
August 14, 2025Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangermentEP6

Velarion’s copy of EPA’s ICIS-NPDES files does not yet include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.

Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.

Watch this permit

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How we handle your data → Privacy

EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID PR0020753 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.