Clean Water Act discharge permit · NPDES MP0020397

MOBIL OIL MARIANA ISLANDS INC SAIPAN TERMINAL, Puerto Rico Village, MP: NPDES MP0020397 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
33Pollutants under a numeric limit
5Pollutants with an effluent exceedance

MOBIL OIL MARIANA ISLANDS INC SAIPAN TERMINAL, held by Mobil Oil Mariana Islands, Inc, holds NPDES permit MP0020397, which discharges to Tanapag Harbor. EPA’s file records it issued March 6, 2018 and expiring April 30, 2023. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filed	MOBIL OIL MARIANA ISLANDS INC SAIPAN TERMINAL
Permittee as filed	Mobil Oil Mariana Islands, Inc
NPDES ID	MP0020397
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Individual permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Program	Industrial stormwater
Issued	March 6, 2018
Expiration date	April 30, 2023
Address	Puerto Rico Village, MP 96950
Receiving water	Tanapag Harbor
Subwatershed	Kannat Laremies-Frontal Phillippine Sea (HUC 220200000104)

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

Effluent limits and exceedances

122Pollutants on file
33Under a numeric limit
120With a violation of any kind
5With 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 122 are shown.

Pollutant or measure	Limits	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
pH	4	13	3	January 31, 2026
Enterococci	2	7	2	March 31, 2026	372% over the limit
Copper, total recoverable	2	5	2	January 31, 2026	4% over the limit
Phosphorus, total [as P]	2	4	1	August 31, 2018	343% over the limit
Zinc, total recoverable	2	4	1	June 30, 2022	17% over the limit
BOD, 5-day, 20 deg. C	2	5	0
Lead, total recoverable	2	4	0
Oil & grease, total recoverable	2	4	0
Solids, total suspended	2	3	0
Arsenic, total recoverable	2	3	0
Manganese, total recoverable	2	3	0
Benzene	2	3	0
Flow, in conduit or thru treatment plant	2	3	0
Salinity	2	2	0
Benzo[b]fluoranthene	1	2	0
Benzo[k]fluoranthene	1	2	0
Benzo[a]pyrene	1	2	0
Chrysene	1	2	0
Fluoranthene	1	2	0
Fluorene	1	2	0
Indeno[1,2,3-cd]pyrene	1	2	0
Phenanthrene	1	2	0
Pyrene	1	2	0
Benzo[ghi]perylene	1	2	0
Benzo[a]anthracene	1	2	0
Dibenz[a,h]anthracene	1	2	0
Naphthalene	1	2	0
Bis[2-chloroethyl] ether	0	2	0
Bis[2-chloroethoxy]methane	0	2	0
Bis[2-chloroisopropyl] ether	0	2	0
Butyl benzyl phthalate	0	2	0
Diethyl phthalate	0	2	0
Dimethyl phthalate	0	2	0
Endosulfan sulfate	0	2	0
.beta.-Endosulfan	0	2	0
.alpha.-Endosulfan	0	2	0
Endrin aldehyde	0	2	0
Hexachlorocyclopentadiene	0	2	0
Hexachlorobutadiene	0	2	0
Hexachloroethane	0	2	0
Isophorone	0	2	0
Methylene chloride	0	2	0
N-Nitrosodi-N-propylamine	0	2	0
N-Nitrosodiphenylamine	0	2	0
N-Nitrosodimethylamine [NDMA]	0	2	0
Nitrobenzene	0	2	0
1,2,4-Trichlorobenzene	0	2	0
2-Chloronaphthalene	0	2	0
2-Chlorophenol	0	2	0
2-Nitrophenol	0	2	0
Di-n-octyl phthalate	0	2	0
2,4-Dichlorophenol	0	2	0
2,4-Dimethylphenol	0	2	0
2,4-Dinitrotoluene	0	2	0
2,4-Dinitrophenol	0	2	0
2,4,6-Trichlorophenol	0	2	0
2,6-Dinitrotoluene	0	2	0
3,3'-Dichlorobenzidine	0	2	0
4-Bromophenyl phenyl ether	0	2	0
4-Chlorophenyl phenyl ether	0	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 MP0020397.

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.

Watch this permit

One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, MP0020397.

Start the watch

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 MP0020397 there.

Nearby on the register

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