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Clean Water Act discharge permit · NPDES GU0020141

NORTHERN DISTRICT STP, Dededo, GU: NPDES GU0020141 discharge permit, effluent exceedances, inspections, penalties

NORTHERN DISTRICT STP, held by GUAM WATERWORKS AUTHORITY, holds NPDES permit GU0020141, which discharges to Pacific Ocean. EPA’s file records it issued April 10, 2013 and expiring May 31, 2018. 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 filedNORTHERN DISTRICT STP
Permittee as filedGUAM WATERWORKS AUTHORITY
NPDES IDGU0020141
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
IssuedApril 10, 2013
Expiration dateMay 31, 2018
AddressDededo, GU 96912
Receiving waterPACIFIC OCEAN

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; the 60 with the most exceedances of 149 are shown.

Pollutant or measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
BOD, 5-day, 20 deg. C16583411July 31, 2025540% over the limit
Solids, total suspended16415255August 31, 20241,264% over the limit
Enterococci6260236April 30, 2026513,474% over the limit
Solids, settleable48141November 30, 2019900% over the limit
pH69331October 31, 2025
Copper, total recoverable15930September 30, 20251,513% over the limit
BOD, 5-day, percent removal23127March 31, 2022460% over the limit
Solids, suspended percent removal22020June 30, 2022300% over the limit
Oil and grease45612October 31, 2018507% over the limit
Oil & grease, total recoverable01410September 30, 20231,427% over the limit
Zinc, total recoverable1354September 30, 202116% over the limit
Nitrite + Nitrate total [as N]2440
Phosphate, ortho [as PO4]2440
Flow, in conduit or thru treatment plant4380
Temperature, water deg. fahrenheit2220
Turbidity2220
Oxygen, dissolved [DO]2220
Salinity2220
Nitrogen, Kjeldahl Total2220
Outfall observation,visual, y/n response2220
Ammonia, unionized240
Pass/Fail Static 20 Minute Fertilization Chronic Strongylocentrotus purpuratus240
Asbestos140
Chromium, trivalent [as Cr]140
Arsenic, total recoverable130
Selenium, total recoverable130
Thallium, total recoverable130
Beryllium, total recoverable [as Be]130
Nickel, total recoverable130
Silver total recoverable130
Cadmium, total recoverable130
Lead, total recoverable130
Antimony, total recoverable130
2-Methyl-4,6-dinitrophenol130
Dichlorobromomethane130
Dibromochloromethane130
Methylene chloride130
2,3,7,8-Tetrachlorodibenzo-p-dioxin130
4-Chloro-3-methylphenol130
Mercury, total recoverable130
Temperature, water deg. centigrade420
Cyanide, total [as CN]120
Chromium, hexavalent [as Cr]120
Carbon tetrachloride120
1,2-Dichloroethane120
Bromoform120
Chloroform120
Toluene120
Benzene120
.delta.-BHC120
Acenaphthylene120
Acenaphthene120
Acrolein120
Acrylonitrile120
Anthracene120
Benzo[b]fluoranthene120
Benzo[k]fluoranthene120
Benzo[a]pyrene120
Bis[2-chloroethyl] ether120
Bis[2-chloroethoxy]methane120

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 GU0020141.

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 GU0020141 there.

Nearby on the register

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

What this page shows

This public-records page covers NPDES permit GU0020141 for the NORTHERN DISTRICT STP in Dededo, GU, held by GUAM WATERWORKS AUTHORITY and discharging to the PACIFIC OCEAN, with the permit listed as administratively continued. The page lists 149 pollutants on file, 148 of them under a numeric limit and 148 with a violation of any kind, and 11 with an effluent exceedance.