Clean Water Act discharge permit · NPDES GU0020087

AGANA SEWERAGE TREATMENT PLANT, Hagatna, GU: NPDES GU0020087 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
148Pollutants under a numeric limit
11Pollutants with an effluent exceedance

AGANA SEWERAGE TREATMENT PLANT, held by GUAM WATERWORKS AUTHORITY, holds NPDES permit GU0020087, 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 filed	AGANA SEWERAGE TREATMENT PLANT
Permittee as filed	GUAM WATERWORKS AUTHORITY
NPDES ID	GU0020087
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Individual permit
Discharger class	Major discharger
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	April 10, 2013
Expiration date	May 31, 2018
Address	Hagatna, GU 96932
Receiving water	PACIFIC OCEAN

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

149Pollutants on file
148Under a numeric limit
149With a violation of any kind
11With an effluent exceedance

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 measure	Limits	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
BOD, 5-day, 20 deg. C	16	679	515	June 30, 2026	369% over the limit
Solids, total suspended	16	537	373	June 30, 2026	864% over the limit
Enterococci	6	338	312	June 30, 2026	3,171,037% over the limit
Solids, settleable	4	110	74	October 31, 2019	550% over the limit
BOD, 5-day, percent removal	2	73	72	June 30, 2026	780% over the limit
Solids, suspended percent removal	2	73	72	June 30, 2026	793% over the limit
Copper, total recoverable	1	76	50	June 30, 2026	2,835% over the limit
Oil & grease, total recoverable	0	32	28	April 30, 2026	4,087% over the limit
Oil and grease	4	68	24	December 31, 2019	7,453% over the limit
pH	6	75	15	December 31, 2025
Silver total recoverable	1	4	2	September 30, 2021	987% over the limit
Flow, in conduit or thru treatment plant	4	44	0
Nitrite + Nitrate total [as N]	2	44	0
Phosphate, ortho [as PO4]	2	44	0
Zinc, total recoverable	1	26	0
Temperature, water deg. fahrenheit	2	22	0
Turbidity	2	22	0
Oxygen, dissolved [DO]	2	22	0
Salinity	2	22	0
Nitrogen, Kjeldahl Total	2	22	0
Outfall observation,visual, y/n response	2	22	0
Ammonia, unionized	2	4	0
Pass/Fail Static 20 Minute Fertilization Chronic Strongylocentrotus purpuratus	2	4	0
Asbestos	1	4	0
2,3,7,8-Tetrachlorodibenzo-p-dioxin	1	3	0
Temperature, water deg. centigrade	4	2	0
Chlorine, total residual	4	2	0
Cyanide, total [as CN]	1	2	0
Arsenic, total recoverable	1	2	0
Selenium, total recoverable	1	2	0
Thallium, total recoverable	1	2	0
Beryllium, total recoverable [as Be]	1	2	0
Chromium, hexavalent [as Cr]	1	2	0
Chromium, trivalent [as Cr]	1	2	0
Nickel, total recoverable	1	2	0
Cadmium, total recoverable	1	2	0
Lead, total recoverable	1	2	0
Antimony, total recoverable	1	2	0
2-Methyl-4,6-dinitrophenol	1	2	0
Dichlorobromomethane	1	2	0
Carbon tetrachloride	1	2	0
1,2-Dichloroethane	1	2	0
Bromoform	1	2	0
Dibromochloromethane	1	2	0
Chloroform	1	2	0
Toluene	1	2	0
Benzene	1	2	0
.delta.-BHC	1	2	0
Acenaphthylene	1	2	0
Acenaphthene	1	2	0
Acrolein	1	2	0
Acrylonitrile	1	2	0
Anthracene	1	2	0
Benzo[b]fluoranthene	1	2	0
Benzo[k]fluoranthene	1	2	0
Benzo[a]pyrene	1	2	0
Bis[2-chloroethyl] ether	1	2	0
Bis[2-chloroethoxy]methane	1	2	0
Bis[2-chloroisopropyl] ether	1	2	0
Butyl benzyl phthalate	1	2	0

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

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES GU0020087.

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 GU0020087 there.

Nearby on the register

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

This public-records page covers the Clean Water Act discharge permit NPDES GU0020087 for the AGANA SEWERAGE TREATMENT PLANT in Hagatna, GU, held by GUAM WATERWORKS AUTHORITY and discharging to the PACIFIC OCEAN. The listed figures are 148 pollutants under a numeric limit, 149 pollutants on file, 149 with a violation of any kind, and 11 with an effluent exceedance.