Clean Water Act discharge permit · NPDES MP0020028
AGINGAN STP, Saipan, MP: NPDES MP0020028 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 14Pollutants under a numeric limit
- 17Pollutants with an effluent exceedance
AGINGAN STP, held by COMMONWEALTH UTILITIES CORP, holds NPDES permit MP0020028, which discharges to Pacific Ocean. EPA’s file records it issued March 6, 2017 and expiring April 30, 2022. 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 | AGINGAN STP |
|---|---|
| Permittee as filed | COMMONWEALTH UTILITIES CORP |
| NPDES ID | MP0020028 |
| 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 | March 6, 2017 |
| Expiration date | April 30, 2022 |
| Address | Saipan, MP 96950 |
| Receiving water | PACIFIC OCEAN |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 31Pollutants on file
- 14Under a numeric limit
- 26With a violation of any kind
- 17With 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.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Enterococci | 4 | 252 | 219 | November 30, 2025 | 99,999% over the limit |
| Solids, total suspended | 16 | 365 | 123 | January 31, 2020 | 1,142% over the limit |
| Copper, total recoverable | 0 | 131 | 82 | March 31, 2017 | 19,900% over the limit |
| BOD, 5-day, 20 deg. C | 16 | 316 | 74 | February 29, 2020 | 338% over the limit |
| pH | 4 | 93 | 37 | September 30, 2009 | |
| Solids, settleable | 4 | 94 | 34 | July 31, 2021 | 2,650% over the limit |
| Solids, suspended percent removal | 2 | 36 | 31 | March 31, 2023 | 506% over the limit |
| BOD, 5-day, percent removal | 2 | 22 | 17 | February 29, 2020 | 337% over the limit |
| Zinc, total recoverable | 0 | 62 | 15 | June 30, 2016 | 226% over the limit |
| Phosphorus, total [as P] | 0 | 60 | 14 | March 31, 2015 | 6,900% over the limit |
| Nitrogen, total [as N] | 0 | 55 | 13 | September 30, 2009 | 2,167% over the limit |
| Turbidity | 0 | 21 | 13 | September 30, 2009 | |
| Phosphate, ortho [as P] | 0 | 57 | 11 | April 30, 2016 | 4,900% over the limit |
| Nitrogen, ammonia total [as N] | 0 | 32 | 10 | September 30, 2009 | 2,500% over the limit |
| Ammonia, unionized | 0 | 52 | 8 | April 30, 2011 | 2,100% over the limit |
| Silver total recoverable | 0 | 63 | 4 | June 30, 2012 | 73% over the limit |
| Nickel, total recoverable | 0 | 54 | 1 | June 30, 2007 | 47% over the limit |
| Flow, in conduit or thru treatment plant | 6 | 471 | 0 | ||
| Chlorine, total residual | 0 | 118 | 0 | ||
| Oil and grease | 0 | 75 | 0 | ||
| Lead, total recoverable | 0 | 49 | 0 | ||
| Nitrogen, nitrate total [as N] | 0 | 22 | 0 | ||
| Pass/Fail Static 48Hr Acute Daphnia Magna | 0 | 6 | 0 | ||
| Pass/Fail Static 48Hr Acute Hyalella azteca | 0 | 3 | 0 | ||
| Pass/Fail Static 20 Minute Fertilization Chronic Strongylocentrotus purpuratus | 1 | 1 | 0 | ||
| Chromium, hexavalent [as Cr] | 0 | 1 | 0 | ||
| Pass/Fail Static 1Hr Fertilization Test Chronic Tripneustes gratilla | 1 | 0 | 0 | ||
| Pass/Fail Static 48Hr Chronic Macrocystis pyrifera | 1 | 0 | 0 | ||
| Pass/Fail Static Renewal 7 Day Chronic Holmesimysis costata | 1 | 0 | 0 | ||
| Pass/Fail Static Renewal 7 Day Chronic Menidia beryllina | 1 | 0 | 0 | ||
| Pass/Fail Static 20 Minute Fertilization Chronic Dendraster excentricus | 1 | 0 | 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
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| August 12, 2019 | Management Practice Violations - Improper Operation and Maintenance | EP6 |
| January 29, 2019 | Management Practice Violations - Improper Operation and Maintenance | EP6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not yet 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 MP0020028 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.