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Clean Water Act discharge permit · NPDES PR0023795

PRASA MAYAGUEZ WWTP, Mayaguez, PR: NPDES PR0023795 discharge permit, effluent exceedances, inspections, penalties

PRASA MAYAGUEZ WWTP, held by PRASA MAYAGUEZ WWTP, holds NPDES permit PR0023795, which discharges to Mona Passage. EPA’s file records it issued September 28, 2016 and expiring November 30, 2021. 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 MAYAGUEZ WWTP
Permittee as filedPRASA MAYAGUEZ WWTP
NPDES IDPR0023795
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 28, 2016
Expiration dateNovember 30, 2021
AddressMayaguez, PR 00708
Receiving waterMONA PASSAGE

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
BOD, 5-day, 20 deg. C4463315October 31, 2001744% over the limit
Solids, total suspended4356212November 30, 2020678% over the limit
pH2165117July 31, 2004
Oil & Grease1150102November 30, 201665,900% over the limit
Chlorine, total residual3125100February 28, 202322,700% over the limit
BOD, 5-day, percent removal111488August 31, 2024567% over the limit
Solids, suspended percent removal110983March 31, 2009567% over the limit
Turbidity110681February 28, 2021
Phenolics, total recoverable08769July 31, 20042,300% over the limit
Sulfide, total [as S]04946February 28, 200299,900% over the limit
Manganese, total [as Mn]06340March 31, 2004270% over the limit
Surfactants [MBAS]05840November 30, 19991,344% over the limit
Iron, total [as Fe]04640December 31, 200010,270% over the limit
Zinc, total [as Zn]06139June 30, 2004182% over the limit
Coliform, fecal general16728November 30, 202099,999% over the limit
Coliform, total general05025April 30, 200214,700% over the limit
Lead, total [as Pb]04420September 30, 200899,999% over the limit
Copper, total [as Cu]14818October 31, 2003258% over the limit
Selenium, total [as Se]04218May 31, 2011999,999,870% over the limit
Nitrite + Nitrate total [as N]02718May 31, 2004283% over the limit
Silver, total [as Ag]04517November 30, 20032,400% over the limit
Oxygen, dissolved [DO]13910June 30, 200982% over the limit
Fluoride, total [as F]03410April 30, 1999162% over the limit
Flow, in conduit or thru treatment plant4516February 28, 200634,539% over the limit
Sulfide-hydrogen sulfide [undissociated]1366December 31, 20167,900% over the limit
Enterococci4256May 31, 202199,999% over the limit
Cyanide, free available1156December 31, 2024183% over the limit
Chromium, hexavalent [as Cr]0156July 31, 199739,900% over the limit
Temperature, water deg. centigrade1354June 30, 20156% over the limit
Mercury, total [as Hg]1344July 31, 20112,673,234% over the limit
Coliform, fecal - % samples exceeding limit1254November 30, 2020400% over the limit
Enterococci - % of upper confidence limit2234February 29, 202033% over the limit
Cyanide, total [as CN]0144May 31, 2004220% over the limit
Cyanide, free [amenable to chlorination]0452July 31, 201533% over the limit
Cadmium, total [as Cd]0272January 31, 2001260% over the limit
Chromium, total [as Cr]0122August 31, 20036,667% over the limit
Barium, total [as Ba]0271September 30, 199610% over the limit
Nitrogen, total [as N]2221January 31, 20219% over the limit
Lindane0181March 31, 200911,786% over the limit
Di[2-ethylhexyl] phthalate [DEHP]0171January 31, 20082,509% over the limit
Boron, total [as B]0111November 30, 19982,192% over the limit
Solids, settleable1320
Color [PT-CO units]1300
Arsenic, total [as As]0270
Strontium 90, total0220
Nitrogen, Kjeldahl, total [as N]1210
Radium 226 + radium 228, total0210
Nickel, total [as Ni]0150
Sulfate, total [as SO4]090
Whole Effluent Toxicity [WET] - M. beryllina150
Whole Effluent Toxicity [WET] - Americamysis bahia (formerly Mysidopsis bahia)150

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

The newest 50 of 67.

DateWhat EPA recordedAgency
September 7, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
August 31, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
August 30, 2026Wet-weather SSO discharge to waters of the U.S., not permit compliant, no endangermentEP6
August 6, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
August 4, 2026Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environmentEP6
July 29, 2026Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environmentEP6
July 29, 2026Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environmentEP6
July 27, 2026Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environmentEP6
July 25, 2026Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
July 20, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
July 19, 2026Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangermentEP6
June 30, 2026Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
June 29, 2026Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
June 26, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
June 10, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
June 9, 2026Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangermentEP6
June 1, 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 22, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
May 18, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
May 6, 2026Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangermentEP6
May 2, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
April 27, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
April 17, 2026Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
April 13, 2026Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
April 13, 2026Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
April 13, 2026Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
March 24, 2026Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environmentEP6
March 24, 2026Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environmentEP6
March 6, 2026Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environmentEP6
February 26, 2026Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
February 7, 2026Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environmentEP6
February 3, 2026Wet-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
January 23, 2026Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangermentEP6
January 5, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
December 3, 2025Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environmentEP6
December 2, 2025Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environmentEP6
December 2, 2025Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
December 1, 2025PR: Failure to submit noncompliance report - CSO, SSO, or Bypass [40 CFR 122.41(l)(6) & (m)(3)(ii)]EP6
November 26, 2025Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environmentEP6
November 25, 2025Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environmentEP6
November 21, 2025Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environmentEP6
November 21, 2025Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environmentEP6
November 20, 2025Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environmentEP6
November 19, 2025Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environmentEP6
November 13, 2025Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangermentEP6
November 8, 2025Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
November 8, 2025Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentEP6
November 7, 2025Dry-weather SSO, no 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.

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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 PR0023795 there.

Nearby on the register

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