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Clean Water Act discharge permit · NPDES GU0020001

CABRAS POWER PLANT, Piti, GU: NPDES GU0020001 discharge permit, effluent exceedances, inspections, penalties

CABRAS POWER PLANT, held by GUAM POWER AUTHORITY, holds NPDES permit GU0020001, which discharges to Inner Apra Harbor. EPA’s file records it issued December 19, 2012 and expiring January 31, 2018. 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 filedCABRAS POWER PLANT
Permittee as filedGUAM POWER AUTHORITY
NPDES IDGU0020001
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
IssuedDecember 19, 2012
Expiration dateJanuary 31, 2018
AddressPiti, GU 96915
Receiving waterINNER APRA HARBOR
SubwatershedAtantano River-Frontal Apra Harbor (HUC 220100000303)
SIC4911 – Electric Services
Other EPA IDs (FRS)RCRA handler GUD982428906; ICIS-AIR source GU0000006601000502

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; the 60 with the most exceedances of 143 are shown.

Pollutant or measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
Enterococci84929August 31, 20255,430% over the limit
Solids, total suspended67319May 31, 2022198% over the limit
Copper, total recoverable61916May 31, 202522,577% over the limit
pH1222913July 31, 2021
Iron, total recoverable21312January 31, 2026156,700% over the limit
Nickel, total recoverable61310January 31, 202594,046% over the limit
Temperature Increase Deg. C01010June 30, 202580% over the limit
Oil & grease, total recoverable12628January 31, 2019272% over the limit
Silver total recoverable486August 31, 202457% over the limit
Nitrite + Nitrate total [as N]254January 31, 2021480% over the limit
Fluoride4223December 31, 201831% over the limit
Mercury, total recoverable442August 31, 20251,540% over the limit
Fluoride, total [as F]21640
Flow, in conduit or thru treatment plant101450
Temperature, water deg. fahrenheit81290
Oil and grease0540
Chlorine, total residual4180
Static 1Hr Chronic Tripneustes Gratilla0180
Cyanide, total [as CN]420
Asbestos420
Arsenic, total recoverable420
Selenium, total recoverable420
Thallium, total recoverable420
Beryllium, total recoverable [as Be]420
Chromium, hexavalent [as Cr]420
Chromium, trivalent [as Cr]420
Zinc, total recoverable420
Cadmium, total recoverable420
Lead, total recoverable420
Antimony, total recoverable420
2-Methyl-4,6-dinitrophenol420
Dichlorobromomethane420
Carbon tetrachloride420
1,2-Dichloroethane420
Bromoform420
Dibromochloromethane420
Chloroform420
Toluene420
Benzene420
.delta.-BHC420
Acenaphthylene420
Acenaphthene420
Acrolein420
Acrylonitrile420
Anthracene420
Benzo[b]fluoranthene420
Benzo[k]fluoranthene420
Benzo[a]pyrene420
Bis[2-chloroethyl] ether420
Bis[2-chloroethoxy]methane420
Bis[2-chloroisopropyl] ether420
Butyl benzyl phthalate420
Chlorobenzene420
Chrysene420
Diethyl phthalate420
Dimethyl phthalate420
1,2-Diphenylhydrazine420
Endosulfan sulfate420
.beta.-Endosulfan420
.alpha.-Endosulfan420

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

EPA’s single-event violation file, as loaded, holds no violation for NPDES GU0020001.

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 GU0020001 there.

Nearby on the register

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

What this page shows

This public-records page covers Clean Water Act discharge permit NPDES GU0020001 for the CABRAS POWER PLANT in Piti, GU, held by GUAM POWER AUTHORITY and discharging to INNER APRA HARBOR. The permit is listed as administratively continued, with a Minor Discharger class of 140, 12 pollutants under a numeric limit, and 12 pollutants with an effluent exceedance.