Velarion Records

Clean Water Act discharge permit · NPDES PR0020869

PRASA TOA ALTA WWTP, Toa Alta, PR: NPDES PR0020869 discharge permit, effluent exceedances, inspections, penalties

PRASA TOA ALTA WWTP, held by PRASA TOA ALTA, holds NPDES permit PR0020869, which discharges to Rio La Plata. EPA’s file records it issued September 29, 2015 and expiring January 31, 2021. 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 TOA ALTA WWTP
Permittee as filedPRASA TOA ALTA
NPDES IDPR0020869
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMinor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedSeptember 29, 2015
Expiration dateJanuary 31, 2021
AddressToa Alta, PR 00758
Receiving waterRIO LA PLATA
SubwatershedRio de la Plata near mouth (HUC 210100050713)
Program components on filePOTW, Pretreatment
SIC4952 – Sewerage Systems
Other EPA IDs (FRS)RCRA handler PRD000691550

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
Arsenic, total [as As]0105100September 30, 20152,777,678% over the limit
Flow, in conduit or thru treatment plant311999November 30, 2015124% over the limit
Chlorine, total residual18274March 31, 202217,082% over the limit
Nitrite + Nitrate total [as N]07872November 30, 2015607,900% over the limit
Phosphorus, total [as P]36353September 30, 200854,984% over the limit
Phenolics, total recoverable04440August 31, 20061,099,900% over the limit
Solids, total suspended612232June 30, 20191,495% over the limit
Mercury, total [as Hg]33731June 30, 20141,666,567% over the limit
BOD, 5-day, 20 deg. C611824September 30, 2018243% over the limit
Cyanide, total [as CN]02115August 31, 202457,592% over the limit
Surfactants [MBAS]31510September 30, 200756,900% over the limit
Solids, suspended percent removal1239August 31, 20201,240% over the limit
Oxygen, dissolved [DO]1219December 31, 202440% over the limit
Coliform, fecal general2217August 31, 201816,342% over the limit
Color [PT-CO units]2145April 30, 2021
BOD, 5-day, percent removal1174November 30, 2025167% over the limit
Copper, total [as Cu]1114March 31, 2003150% over the limit
Manganese, total [as Mn]0104July 31, 20059,900% over the limit
Temperature, water deg. centigrade1163October 31, 20193% over the limit
Coliform, total general2113August 31, 20091,500% over the limit
Ammonia, unionized0103April 30, 20044,777% over the limit
Sulfide-hydrogen sulfide [undissociated]393June 30, 201415,900% over the limit
Coliform, fecal - % samples exceeding limit2162August 31, 2018300% over the limit
Cyanide, free available3112May 31, 20096,650% over the limit
Sulfide, total [as S]072December 31, 200499,900% over the limit
Oil & Grease1221June 30, 2008593% over the limit
Solids, total dissolved- 180 deg. C081May 31, 20071,364% over the limit
Solids, total dissolved131October 31, 201810% over the limit
pH2260
Turbidity1130
Solids, settleable1130
Nitrogen, total [as N]3120
Fluoride, total [as F]080
Zinc, total [as Zn]070
Chromium, hexavalent [as Cr]040
Chromium III040
Cadmium, total [as Cd]030
Whole effluent toxicity030
Whole Effluent Toxicity [WET] - P. promelas120
Whole Effluent Toxicity [WET] - D. magna120
Sulfate, total [as SO4]210
Nitrogen, ammonia, total [as NH3]210
2-Methyl-4,6-dinitrophenol010
2-Chlorophenol010
2,4-Dichlorophenol010
2,4-Dimethylphenol010
2,4-Dinitrophenol010
2,4,6-Trichlorophenol010
Phenol010
Pentachlorophenol010

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
August 31, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
June 28, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
March 19, 2026Dry-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentEP6
February 19, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
February 2, 2026Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
December 3, 2025Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
October 17, 2025Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
September 19, 2025Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
September 13, 2025Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
September 6, 2025Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
August 25, 2025Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
February 15, 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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Nearby on the register

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

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