Clean Water Act discharge permit · NPDES MP0020010
SADOG TASI WWTP, Saipan, MP: NPDES MP0020010 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 18Pollutants under a numeric limit
- 14Pollutants with an effluent exceedance
SADOG TASI WWTP, held by COMMONWEALTH UTILITIES CORP, holds NPDES permit MP0020010, which discharges to Tanapag Harbor Puerto Rico Industri. 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 (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | SADOG TASI WWTP |
|---|---|
| Permittee as filed | COMMONWEALTH UTILITIES CORP |
| NPDES ID | MP0020010 |
| 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 | TANAPAG HARBOR PUERTO RICO INDUSTRI |
| 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
- 32Pollutants on file
- 18Under a numeric limit
- 27With a violation of any kind
- 14With 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 | 450 | 374 | May 31, 2026 | 99,999% over the limit |
| Solids, total suspended | 16 | 399 | 112 | December 31, 2023 | 660% over the limit |
| Copper, total recoverable | 0 | 155 | 99 | March 31, 2017 | 2,275% over the limit |
| BOD, 5-day, 20 deg. C | 16 | 352 | 70 | December 31, 2023 | 100% over the limit |
| Solids, suspended percent removal | 2 | 73 | 68 | December 31, 2023 | 981% over the limit |
| Nickel, total recoverable | 0 | 106 | 42 | June 30, 2016 | 2,567% over the limit |
| BOD, 5-day, percent removal | 2 | 44 | 39 | December 31, 2023 | 204% over the limit |
| Solids, settleable | 4 | 121 | 30 | November 30, 2025 | 4,900% over the limit |
| Phosphorus, total [as P] | 2 | 81 | 21 | March 31, 2024 | 305% over the limit |
| pH | 4 | 87 | 20 | July 31, 2013 | |
| Zinc, total recoverable | 0 | 74 | 15 | June 30, 2014 | 389% over the limit |
| Phosphate, ortho [as P] | 2 | 70 | 6 | June 30, 2013 | 195% over the limit |
| Pass/Fail Static 48Hr Acute Hyalella azteca | 0 | 6 | 3 | June 30, 2016 | |
| Silver total recoverable | 0 | 70 | 2 | September 30, 2015 | 22% over the limit |
| Flow, in conduit or thru treatment plant | 6 | 417 | 0 | ||
| Chlorine, total residual | 0 | 181 | 0 | ||
| Oil and grease | 0 | 75 | 0 | ||
| Nitrogen, total [as N] | 2 | 57 | 0 | ||
| Ammonia, unionized | 0 | 56 | 0 | ||
| Nitrogen, ammonia total [as N] | 0 | 36 | 0 | ||
| Nitrogen, nitrite total [as N] | 2 | 33 | 0 | ||
| Oil & grease, total recoverable [Q/C] | 0 | 5 | 0 | ||
| Nitrogen, Total | 0 | 2 | 0 | ||
| Pass/Fail Static 20 Minute Fertilization Chronic Strongylocentrotus purpuratus | 1 | 1 | 0 | ||
| Temperature, water deg. centigrade | 0 | 1 | 0 | ||
| Oxygen, dissolved [DO] | 0 | 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
- 4Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| August 12, 2019 | Management Practice Violations - Improper Operation and Maintenance | EP6 |
| August 12, 2019 | Management Practice Violations - No Licensed/Certified Operator | EP6 |
| January 29, 2019 | Management Practice Violations - Improper Operation and Maintenance | EP6 |
| January 29, 2019 | Management Practice Violations - No Licensed/Certified Operator | EP6 |
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 MP0020010 there.
Nearby on the register
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- Every permit record in Northern Mariana Islands, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.