Velarion Records

Clean Water Act discharge permit · NPDES PR0023710

PRASA ARECIBO WWTP, Arecibo, PR: NPDES PR0023710 discharge permit, effluent exceedances, inspections, penalties

PRASA ARECIBO WWTP, held by PRASA ARECIBO RWWTP, holds NPDES permit PR0023710, which discharges to Atlantic Ocean. EPA’s file records it issued September 3, 2002 and expiring October 31, 2007. 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 ARECIBO WWTP
Permittee as filedPRASA ARECIBO RWWTP
NPDES IDPR0023710
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
IssuedSeptember 3, 2002
Expiration dateOctober 31, 2007
AddressArecibo, PR 00612
Receiving waterATLANTIC OCEAN
Program components on filePOTW, Pretreatment
SIC4952 – Sewerage Systems
Other EPA IDs (FRS)RCRA handler PRD980534507

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
Chlorine, total residual1167156May 31, 202399,999% over the limit
Coliform, fecal general2158107March 31, 202699,999% over the limit
Coliform, fecal - % samples exceeding limit121775March 31, 2026400% over the limit
Nitrite + Nitrate total [as N]05646October 31, 20023,900% over the limit
Enterococci - % of upper confidence limit05930March 31, 202633% over the limit
Solids, total suspended618429February 28, 2025900% over the limit
BOD, 5-day, percent removal14525January 31, 202643% over the limit
Enterococci02825March 31, 202699,999% over the limit
Coliform, total general14324October 31, 201599,999% over the limit
Solids, suspended percent removal14223May 31, 2024100% over the limit
Sulfide-hydrogen sulfide [undissociated]13919December 31, 20251,980% over the limit
Sulfide, total [as S]02413December 31, 19981,150% over the limit
Flow, in conduit or thru treatment plant44411October 31, 200591% over the limit
Turbidity13011December 31, 2025
pH2408September 30, 2012
BOD, 5-day, 20 deg. C61766June 30, 2018615% over the limit
Surfactants [MBAS]3234September 30, 2013551% over the limit
Zinc, total [as Zn]1224May 31, 202383% over the limit
Fluoride, total [as F]2223October 31, 1997169% over the limit
Nickel, total [as Ni]1302July 31, 2025191% over the limit
Lead, total [as Pb]1212July 31, 2003737% over the limit
Cyanide, free available082September 30, 2021198% over the limit
Thallium, total [as Tl]2301March 31, 2009130% over the limit
Silver, total [as Ag]1281February 29, 202421% over the limit
Copper, total [as Cu]2251June 30, 20197% over the limit
Manganese, total [as Mn]2201May 31, 199988% over the limit
Temperature, water deg. centigrade1201June 30, 201611% over the limit
Cyanide, total [as CN]2181November 30, 20068% over the limit
Phenolics, total recoverable2181December 31, 200099,999% over the limit
Antimony, total [as Sb]1470
Chromium, total [as Cr]1450
Boron, total [as B]1440
Oil & Grease2350
Chromium, hexavalent [as Cr]1330
Selenium, total [as Se]2240
Mercury, total [as Hg]1240
Arsenic, total [as As]1230
Barium, total [as Ba]2220
Cadmium, total [as Cd]1210
Color [PT-CO units]1190
Oxygen, dissolved [DO]1190
Nitrogen, Kjeldahl, total [as N]0170
Solids, settleable1160
Whole Effluent Toxicity [WET] - Americamysis bahia (formerly Mysidopsis bahia)0150
NOAEL Static 48Hr Acute Cyprinodon variegatus0150
% Effect Static Chronic Arbacia punctulata0140
NOEC Sub-Lethal Static Renewal 7 Day Chronic Cyprinodeon variegatus0140
% Growth Reduction Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)0140
Nitrogen, total [as N]180
2-Methyl-4,6-dinitrophenol020
2-Chlorophenol020
2,4-Dichlorophenol020
2,4,6-Trichlorophenol020
Pentachlorophenol020

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
September 8, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
September 8, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
August 24, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
August 20, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
August 20, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
August 6, 2026Dry-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentEP6
July 20, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
July 6, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
June 30, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
June 12, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
May 29, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
May 26, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
May 26, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
May 26, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
May 22, 2026Dry-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentEP6
May 21, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
May 16, 2026Dry-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentEP6
April 28, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
April 16, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
April 15, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
April 14, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
April 7, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
February 23, 2026Dry-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentEP6
February 17, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
February 12, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
February 11, 2026PR: Failure to submit noncompliance report - CSO, SSO, or Bypass [40 CFR 122.41(l)(6) & (m)(3)(ii)]EP6
February 5, 2026Dry-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentEP6
January 20, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
January 18, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
January 13, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
January 12, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
January 7, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
December 20, 2025PR: Failure to submit noncompliance report - CSO, SSO, or Bypass [40 CFR 122.41(l)(6) & (m)(3)(ii)]EP6
December 14, 2025Dry-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentEP6
November 21, 2025PR: Failure to submit noncompliance report - CSO, SSO, or Bypass [40 CFR 122.41(l)(6) & (m)(3)(ii)]EP6
November 18, 2025Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
November 18, 2025Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
November 15, 2025Dry-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentEP6
October 28, 2025Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
October 24, 2025Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentEP6
October 14, 2025Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
October 14, 2025Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
October 3, 2025Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environmentEP6
September 15, 2025Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
August 29, 2025Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
August 22, 2025Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
August 17, 2025Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
August 17, 2025Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
February 28, 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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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 PR0023710 there.

Nearby on the register

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

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