Clean Water Act discharge permit · NPDES MP0020371
MANAGAHA ISLAND WASTEWATER TREATMENT PLANT, Northern Mariana Islands, Commonwealth Of The, MP: NPDES MP0020371 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 141Pollutants under a numeric limit
- 8Pollutants with an effluent exceedance
MANAGAHA ISLAND WASTEWATER TREATMENT PLANT, held by Commonwealth of Northern Mariana Islands - Department of Public Lands, holds NPDES permit MP0020371, which discharges to Marine Waters By Tanapag Harbor, Saipan. EPA’s file records it issued April 22, 2019 and expiring April 30, 2024. 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 filed | MANAGAHA ISLAND WASTEWATER TREATMENT PLANT |
|---|---|
| Permittee as filed | Commonwealth of Northern Mariana Islands - Department of Public Lands |
| NPDES ID | MP0020371 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | April 22, 2019 |
| Expiration date | April 30, 2024 |
| Address | Northern Mariana Islands, Commonwealth Of The, MP 96950 |
| Receiving water | Marine waters by Tanapag Harbor, Saipan |
| SIC | 4952 – Sewerage Systems |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 148Pollutants on file
- 141Under a numeric limit
- 147With a violation of any kind
- 8With 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 148 are shown.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| pH | 16 | 57 | 21 | March 31, 2026 | |
| BOD, 5-day, 20 deg. C | 16 | 98 | 10 | July 31, 2019 | 99,999% over the limit |
| Solids, suspended percent removal | 2 | 18 | 9 | December 31, 2025 | 233% over the limit |
| Copper, total recoverable | 7 | 12 | 4 | March 31, 2026 | 2,873% over the limit |
| Cyanide, total [as CN] | 1 | 12 | 2 | November 30, 2025 | 14,900% over the limit |
| BOD, 5-day, percent removal | 2 | 11 | 2 | February 29, 2024 | 33% over the limit |
| Enterococci | 12 | 31 | 1 | September 30, 2008 | 146% over the limit |
| Chlorine, total residual | 6 | 18 | 1 | September 30, 2009 | 7% over the limit |
| Solids, total suspended | 16 | 88 | 0 | ||
| Flow, in conduit or thru treatment plant | 8 | 44 | 0 | ||
| Nitrogen, total [as N] | 6 | 21 | 0 | ||
| Temperature, water deg. centigrade | 4 | 17 | 0 | ||
| Ammonia, unionized | 6 | 15 | 0 | ||
| Nitrogen, Nitrate Total | 6 | 12 | 0 | ||
| Phosphorus, Total | 6 | 12 | 0 | ||
| Nitrogen, nitrate total [as N] | 0 | 9 | 0 | ||
| Nickel, total recoverable | 7 | 8 | 0 | ||
| Turbidity | 0 | 7 | 0 | ||
| Oxygen, dissolved [DO] | 0 | 6 | 0 | ||
| Cyanide, total recoverable | 6 | 5 | 0 | ||
| Arsenic, total recoverable | 1 | 4 | 0 | ||
| Selenium, total recoverable | 1 | 3 | 0 | ||
| Zinc, total recoverable | 1 | 3 | 0 | ||
| Phosphorus, total [as P] | 0 | 3 | 0 | ||
| Phosphate, ortho [as P] | 0 | 3 | 0 | ||
| Suspended Solids, Total | 0 | 3 | 0 | ||
| Manganese, total recoverable | 0 | 2 | 0 | ||
| Thallium, total recoverable | 1 | 1 | 0 | ||
| Beryllium, total recoverable [as Be] | 1 | 1 | 0 | ||
| Chromium, hexavalent [as Cr] | 1 | 1 | 0 | ||
| Chromium, trivalent [as Cr] | 1 | 1 | 0 | ||
| Silver total recoverable | 1 | 1 | 0 | ||
| Cadmium, total recoverable | 1 | 1 | 0 | ||
| Lead, total recoverable | 1 | 1 | 0 | ||
| Antimony, total recoverable | 1 | 1 | 0 | ||
| 2-Methyl-4,6-dinitrophenol | 1 | 1 | 0 | ||
| Dichlorobromomethane | 1 | 1 | 0 | ||
| Carbon tetrachloride | 1 | 1 | 0 | ||
| 1,2-Dichloroethane | 1 | 1 | 0 | ||
| Bromoform | 1 | 1 | 0 | ||
| Dibromochloromethane | 1 | 1 | 0 | ||
| Chloroform | 1 | 1 | 0 | ||
| Toluene | 1 | 1 | 0 | ||
| Benzene | 1 | 1 | 0 | ||
| .delta.-BHC | 1 | 1 | 0 | ||
| Acenaphthylene | 1 | 1 | 0 | ||
| Acenaphthene | 1 | 1 | 0 | ||
| Acrolein | 1 | 1 | 0 | ||
| Acrylonitrile | 1 | 1 | 0 | ||
| Anthracene | 1 | 1 | 0 | ||
| Benzo[b]fluoranthene | 1 | 1 | 0 | ||
| Benzo[k]fluoranthene | 1 | 1 | 0 | ||
| Benzo[a]pyrene | 1 | 1 | 0 | ||
| Bis[2-chloroethyl] ether | 1 | 1 | 0 | ||
| Bis[2-chloroethoxy]methane | 1 | 1 | 0 | ||
| Bis[2-chloroisopropyl] ether | 1 | 1 | 0 | ||
| Butyl benzyl phthalate | 1 | 1 | 0 | ||
| Chlorobenzene | 1 | 1 | 0 | ||
| Chrysene | 1 | 1 | 0 | ||
| Diethyl phthalate | 1 | 1 | 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 MP0020371.
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
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Start the watch
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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 MP0020371 there.
Nearby on the register
- Discharge permits in Northern Mariana Islands
- Every permit record in Northern Mariana Islands, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.