Velarion Records

Clean Water Act discharge permit · NPDES PR0020656

PRASA MAUNABO WWTP, Maunabo, PR: NPDES PR0020656 discharge permit, effluent exceedances, inspections, penalties

PRASA MAUNABO WWTP, held by PRASA MAUNABO, holds NPDES permit PR0020656, which discharges to Rio Maunabo. 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 (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filedPRASA MAUNABO WWTP
Permittee as filedPRASA MAUNABO
NPDES IDPR0020656
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
AddressMaunabo, PR 00707
Receiving waterRIO MAUNABO
Receiving water impaired303(D) Listed
SubwatershedRio Maunabo at mouth (HUC 210100050101)
Program components on filePOTW, Pretreatment
SIC4952 – Sewerage Systems
Other EPA IDs (FRS)RCRA handler PRD000689810

Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.

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
BOD, 5-day, percent removal1214202July 31, 2026327% over the limit
Solids, suspended percent removal1213200April 30, 2026473% over the limit
Chlorine, total residual1174166March 31, 20189,500% over the limit
BOD, 5-day, 20 deg. C6193107July 31, 2026448% over the limit
Copper, total [as Cu]2122107March 31, 20263,497% over the limit
Color [PT-CO units]2114102June 30, 2026
Flow, in conduit or thru treatment plant311693March 31, 2012882% over the limit
Solids, total suspended614765May 31, 20251,011% over the limit
Surfactants [MBAS]07060June 30, 20105,879% over the limit
Phosphorus, total [as P]25438July 31, 20261,458% over the limit
Coliform, total general04136July 31, 201599,999% over the limit
Coliform, fecal general05135June 30, 201799,999% over the limit
Sulfide, total [as S]03628December 31, 200149,900% over the limit
Oxygen, dissolved [DO]13927April 30, 202492% over the limit
Cadmium, total [as Cd]14126December 31, 20041,965% over the limit
Solids, total dissolved13017April 30, 202371% over the limit
Coliform, fecal - % samples exceeding limit01713June 30, 2017400% over the limit
Manganese, total [as Mn]01912December 31, 2005502% over the limit
Solids, total dissolved- 180 deg. C01711November 30, 20065,900% over the limit
Enterococci42210July 31, 20261,762% over the limit
Sulfide-hydrogen sulfide [undissociated]1107April 30, 20241,936% over the limit
Oil & Grease1246November 30, 2006194% over the limit
Temperature, water deg. centigrade1155July 31, 20266% over the limit
Ammonia, unionized0105November 30, 200648% over the limit
Turbidity1164November 30, 2006
Lead, total [as Pb]0164June 30, 20101,233% over the limit
Ammonia & ammonium- total1123July 31, 202619,617,184% over the limit
Nitrite + Nitrate total [as N]0123July 31, 200628,365% over the limit
Nitrogen, total [as N]2113July 31, 20261,018% over the limit
Nitrogen, ammonia, total [as NH3]061April 30, 20164% over the limit
pH2240
Solids, settleable1130
Fluoride, total [as F]0120
Arsenic, total [as As]0120
Whole effluent toxicity0120
Mercury, total [as Hg]0100
Cyanide, total [as CN]080
Chloride [as Cl]080
2-Methyl-4,6-dinitrophenol050
2-Chlorophenol050
2,4-Dichlorophenol050
2,4-Dimethylphenol050
2,4-Dinitrophenol050
2,4,6-Trichlorophenol050
Phenol050
Pentachlorophenol050
Chromium, hexavalent [as Cr]040
Nickel, total [as Ni]040
Zinc, total [as Zn]040
Chromium III040
Whole Effluent Toxicity [WET] - P. promelas230
Whole Effluent Toxicity [WET] - D. magna230

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
December 28, 2025Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangermentEP6
November 13, 2025Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangermentEP6
June 8, 2017Management Practice Violations - Improper Operation and MaintenanceEP6

Velarion’s copy of EPA’s ICIS-NPDES files does not 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.

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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 PR0020656 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

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