NPDES PR0023761 · Clean Water Act
PRASA SANTA ISABEL WWTP, Santa Isabel, PR: NPDES PR0023761 discharge permit, effluent exceedances, inspections, penalties
PRASA SANTA ISABEL WWTP, Santa Isabel, Puerto Rico: Individual permit PR0023761, held by PRASA SANTA ISABEL; Publicly owned treatment works; Administratively continued; issued April 16, 2014, term to June 30, 2019; discharges to CARIBBEAN SEA.
- Solids, total suspended: 7 limits, 225 violations of any kind, 125 effluent exceedances, latest October 31, 2025, largest 1,344% over the limit.
- Chlorine, total residual: 1 limit, 90 violations of any kind, 84 effluent exceedances, latest November 30, 2024, largest 6,433% over the limit.
- Copper, total [as Cu]: 2 limits, 78 violations of any kind, 72 effluent exceedances, latest May 31, 2024, largest 10,061% over the limit.
- pH: 2 limits, 85 violations of any kind, 71 effluent exceedances, latest October 31, 2024.
- Cyanide, total [as CN]: 0 limits, 69 violations of any kind, 68 effluent exceedances, latest November 30, 2013, largest 2,300% over the limit.
- Turbidity: 2 limits, 69 violations of any kind, 63 effluent exceedances, latest May 31, 2024.
- Oxygen, dissolved [DO]: 1 limit, 69 violations of any kind, 61 effluent exceedances, latest October 31, 2024, largest 83% over the limit.
- Flow, in conduit or thru treatment plant: 4 limits, 78 violations of any kind, 58 effluent exceedances, latest April 30, 2006, largest 68,500% over the limit.
- Solids, suspended percent removal: 1 limit, 108 violations of any kind, 56 effluent exceedances, latest March 31, 2026, largest 407% over the limit.
- Coliform, fecal general: 2 limits, 67 violations of any kind, 55 effluent exceedances, latest September 30, 2019, largest 99,999% over the limit.
- Nitrogen, inorganic total: 0 limits, 57 violations of any kind, 55 effluent exceedances, latest April 30, 2006, largest 534% over the limit.
- Phenolics, total recoverable: 0 limits, 95 violations of any kind, 52 effluent exceedances, latest April 30, 2006, largest 3,000% over the limit.
- Nitrogen, total [as N]: 2 limits, 69 violations of any kind, 50 effluent exceedances, latest April 30, 2016, largest 20,977% over the limit.
- BOD, 5-day, 20 deg. C: 7 limits, 167 violations of any kind, 46 effluent exceedances, latest August 31, 2025, largest 1,200% over the limit.
- Enterococci: 2 limits, 34 violations of any kind, 28 effluent exceedances, latest September 30, 2019, largest 784% over the limit.
- Surfactants [MBAS]: 2 limits, 34 violations of any kind, 25 effluent exceedances, latest January 31, 2014, largest 1,712% over the limit.
- Coliform, fecal - % samples exceeding limit: 1 limit, 32 violations of any kind, 22 effluent exceedances, latest September 30, 2019, largest 400% over the limit.
- Coliform, total general: 2 limits, 70 violations of any kind, 20 effluent exceedances, latest January 31, 2014, largest 761,720% over the limit.
- BOD, 5-day, percent removal: 1 limit, 69 violations of any kind, 18 effluent exceedances, latest September 30, 2025, largest 533% over the limit.
- Zinc, total [as Zn]: 0 limits, 20 violations of any kind, 16 effluent exceedances, latest May 31, 2005, largest 110% over the limit.
- Lead, total [as Pb]: 0 limits, 18 violations of any kind, 16 effluent exceedances, latest December 31, 2004, largest 288% over the limit.
- Cyanide, free available: 2 limits, 22 violations of any kind, 13 effluent exceedances, latest July 31, 2020, largest 1,760% over the limit.
- Sulfide, total [as S]: 0 limits, 14 violations of any kind, 11 effluent exceedances, latest June 30, 2002, largest 23,400% over the limit.
- Enterococci: group D, MF trans, M-E, EIA: 0 limits, 14 violations of any kind, 10 effluent exceedances, latest May 31, 2014, largest 99,999% over the limit.
- Silver, total [as Ag]: 2 limits, 13 violations of any kind, 9 effluent exceedances, latest November 30, 2014, largest 1,078% over the limit.
- Temperature, water deg. centigrade: 1 limit, 16 violations of any kind, 8 effluent exceedances, latest August 31, 2018, largest 88% over the limit.
- Sulfide-hydrogen sulfide [undissociated]: 2 limits, 24 violations of any kind, 6 effluent exceedances, latest November 30, 2023, largest 7,900% over the limit.
- Selenium, total [as Se]: 0 limits, 8 violations of any kind, 6 effluent exceedances, latest June 30, 2005, largest 420% over the limit.
- Enterococci - % of upper confidence limit: 1 limit, 51 violations of any kind, 4 effluent exceedances, latest September 30, 2019, largest 33% over the limit.
- Nickel, total [as Ni]: 2 limits, 10 violations of any kind, 3 effluent exceedances, latest November 30, 2013, largest 76% over the limit.
- Cadmium, total [as Cd]: 0 limits, 6 violations of any kind, 2 effluent exceedances, latest July 31, 2004, largest 75,900% over the limit.
- Manganese, total [as Mn]: 0 limits, 5 violations of any kind, 1 effluent exceedance, latest July 31, 2001, largest 4% over the limit.
- Mercury, total [as Hg]: 0 limits, 3 violations of any kind, 1 effluent exceedance, latest December 31, 2007, largest 1,371% over the limit.
- Arsenic, total [as As]: 0 limits, 1 violation of any kind, 1 effluent exceedance, latest May 31, 2006, largest 257% over the limit.
- Whole Effluent Toxicity [WET] - M. beryllina: 1 limit, 20 violations of any kind.
- Whole Effluent Toxicity [WET] - Americamysis bahia (formerly Mysidopsis bahia): 1 limit, 20 violations of any kind.
- Phenols: 0 limits, 17 violations of any kind.
- Oil & Grease: 1 limit, 13 violations of any kind.
- Whole effluent toxicity: 0 limits, 9 violations of any kind.
- Color [PT-CO units]: 1 limit, 8 violations of any kind.
- Solids, settleable: 1 limit, 8 violations of any kind.
- Pentachlorophenol: 0 limits, 5 violations of any kind.
- Chromium, total [as Cr]: 0 limits, 4 violations of any kind.
- 2-Chlorophenol: 0 limits, 4 violations of any kind.
- 2,4-Dichlorophenol: 0 limits, 4 violations of any kind.
- 2,4-Dimethylphenol: 0 limits, 4 violations of any kind.
- 2,4-Dinitrophenol: 0 limits, 4 violations of any kind.
- 2,4,6-Trichlorophenol: 0 limits, 4 violations of any kind.
- Nickel, dissolved [as Ni]: 0 limits, 3 violations of any kind.
- 2-Methyl-4,6-dinitrophenol: 0 limits, 3 violations of any kind.
- Sulfate, total [as SO4]: 2 limits, 1 violation of any kind.
- April 6, 2026: Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
- March 20, 2026: Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
- March 18, 2026: Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
- March 12, 2026: Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
- March 4, 2026: Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
- March 3, 2026: Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
- January 27, 2026: Evaluation (E).
- October 12, 2025: Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
Puerto Rico holds 34 Publicly owned treatment works coverages of this permit type in EPA’s file; 9 were issued before PR0023761. PRASA SANTA ISABEL holds 2 permits in Puerto Rico.
Other permits held by PRASA SANTA ISABEL
- PRASA SANTA ISABEL, Santa Isabel: PRL023761, issued 2021-01-01
Coverages issued nearest PR0023761
- 2003-02-19: PRASA AGUADILLA WWTP, Aguadilla: PR0023736, held by PRASA AGUADILLA RWWTP
- 2003-09-08: PRASA SABANA GRANDE WWTP, Sabana Grande: PR0025542, held by PRASA SABANA GRANDE STP
- 2004-09-29: PRASA BARCELONETA WWTP, Barceloneta: PR0021237, held by PRASA BARCELONETA
- 2006-09-28: PRASA PONCE WWTP, Ponce: PR0021563, held by PRASA PONCE STP
- 2010-12-17: PRASA CAROLINA WWTP, San Juan: PR0023752, held by PRASA CAROLINA RWWTP
- 2014-09-29: PRASA LAJAS WWTP, Lajas: PR0020575, held by PRASA LAJAS
- 2014-09-29: PRASA OROCOVIS WWTP, Orocovis: PR0020745, held by PRASA OROCOVIS
- 2014-09-29: PRASA AIBONITO WWTP, Aibonito: PR0025461
- 2014-09-29: PRASA COMERIO WWTP, Comerio: PR0025658, held by PRASA COMERIO WASTE WATER TREA
- 2014-09-29: PRASA UTUADO NEW WWTP, Utuado: PR0026603, held by PRASA - Utuado WWTP
PRASA SANTA ISABEL WWTP among its neighbors
Its county: 2, 1 major; PR0023761 is major permit.
Other permits in the county
- HAMILTON SUNDSTRAND DE PUERTO RICO, INC., Santa Isabel: PRNOEJ00B, minor, term to 2024-01-09
Identity
| Facility | PRASA SANTA ISABEL WWTP |
|---|---|
| Permittee | PRASA SANTA ISABEL |
| NPDES ID | PR0023761 |
| Status | Administratively continued |
| Type | Individual permit |
| Class | Major |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | April 16, 2014 |
| Expires | June 30, 2019 |
| Address | Santa Isabel, PR 00757 |
| Receiving water | CARIBBEAN SEA |
| Program components on file | POTW, Pretreatment |
| SIC | 4952 – Sewerage Systems |
| Other EPA IDs (FRS) | RCRA handler PRD000691527 |
NPDES PR0023761: effluent limits and exceedances
PRASA SANTA ISABEL WWTP (NPDES PR0023761): 51 pollutants on file, 28 limited; 51 with a violation of any kind, 34 with an exceedance.
| Pollutant | Limits | Violations | Exceedances | Latest | Largest, as filed |
|---|---|---|---|---|---|
| Solids, total suspended | 7 | 225 | 125 | October 31, 2025 | 1,344% over the limit |
| Chlorine, total residual | 1 | 90 | 84 | November 30, 2024 | 6,433% over the limit |
| Copper, total [as Cu] | 2 | 78 | 72 | May 31, 2024 | 10,061% over the limit |
| pH | 2 | 85 | 71 | October 31, 2024 | |
| Cyanide, total [as CN] | 0 | 69 | 68 | November 30, 2013 | 2,300% over the limit |
| Turbidity | 2 | 69 | 63 | May 31, 2024 | |
| Oxygen, dissolved [DO] | 1 | 69 | 61 | October 31, 2024 | 83% over the limit |
| Flow, in conduit or thru treatment plant | 4 | 78 | 58 | April 30, 2006 | 68,500% over the limit |
| Solids, suspended percent removal | 1 | 108 | 56 | March 31, 2026 | 407% over the limit |
| Coliform, fecal general | 2 | 67 | 55 | September 30, 2019 | 99,999% over the limit |
| Nitrogen, inorganic total | 0 | 57 | 55 | April 30, 2006 | 534% over the limit |
| Phenolics, total recoverable | 0 | 95 | 52 | April 30, 2006 | 3,000% over the limit |
| Nitrogen, total [as N] | 2 | 69 | 50 | April 30, 2016 | 20,977% over the limit |
| BOD, 5-day, 20 deg. C | 7 | 167 | 46 | August 31, 2025 | 1,200% over the limit |
| Enterococci | 2 | 34 | 28 | September 30, 2019 | 784% over the limit |
| Surfactants [MBAS] | 2 | 34 | 25 | January 31, 2014 | 1,712% over the limit |
| Coliform, fecal - % samples exceeding limit | 1 | 32 | 22 | September 30, 2019 | 400% over the limit |
| Coliform, total general | 2 | 70 | 20 | January 31, 2014 | 761,720% over the limit |
| BOD, 5-day, percent removal | 1 | 69 | 18 | September 30, 2025 | 533% over the limit |
| Zinc, total [as Zn] | 0 | 20 | 16 | May 31, 2005 | 110% over the limit |
| Lead, total [as Pb] | 0 | 18 | 16 | December 31, 2004 | 288% over the limit |
| Cyanide, free available | 2 | 22 | 13 | July 31, 2020 | 1,760% over the limit |
| Sulfide, total [as S] | 0 | 14 | 11 | June 30, 2002 | 23,400% over the limit |
| Enterococci: group D, MF trans, M-E, EIA | 0 | 14 | 10 | May 31, 2014 | 99,999% over the limit |
| Silver, total [as Ag] | 2 | 13 | 9 | November 30, 2014 | 1,078% over the limit |
| Temperature, water deg. centigrade | 1 | 16 | 8 | August 31, 2018 | 88% over the limit |
| Sulfide-hydrogen sulfide [undissociated] | 2 | 24 | 6 | November 30, 2023 | 7,900% over the limit |
| Selenium, total [as Se] | 0 | 8 | 6 | June 30, 2005 | 420% over the limit |
| Enterococci - % of upper confidence limit | 1 | 51 | 4 | September 30, 2019 | 33% over the limit |
| Nickel, total [as Ni] | 2 | 10 | 3 | November 30, 2013 | 76% over the limit |
| Cadmium, total [as Cd] | 0 | 6 | 2 | July 31, 2004 | 75,900% over the limit |
| Manganese, total [as Mn] | 0 | 5 | 1 | July 31, 2001 | 4% over the limit |
| Mercury, total [as Hg] | 0 | 3 | 1 | December 31, 2007 | 1,371% over the limit |
| Arsenic, total [as As] | 0 | 1 | 1 | May 31, 2006 | 257% over the limit |
| Whole Effluent Toxicity [WET] - M. beryllina | 1 | 20 | 0 | ||
| Whole Effluent Toxicity [WET] - Americamysis bahia (formerly Mysidopsis bahia) | 1 | 20 | 0 | ||
| Phenols | 0 | 17 | 0 | ||
| Oil & Grease | 1 | 13 | 0 | ||
| Whole effluent toxicity | 0 | 9 | 0 | ||
| Color [PT-CO units] | 1 | 8 | 0 | ||
| Solids, settleable | 1 | 8 | 0 | ||
| Pentachlorophenol | 0 | 5 | 0 | ||
| Chromium, total [as Cr] | 0 | 4 | 0 | ||
| 2-Chlorophenol | 0 | 4 | 0 | ||
| 2,4-Dichlorophenol | 0 | 4 | 0 | ||
| 2,4-Dimethylphenol | 0 | 4 | 0 | ||
| 2,4-Dinitrophenol | 0 | 4 | 0 | ||
| 2,4,6-Trichlorophenol | 0 | 4 | 0 | ||
| Nickel, dissolved [as Ni] | 0 | 3 | 0 | ||
| 2-Methyl-4,6-dinitrophenol | 0 | 3 | 0 | ||
| Sulfate, total [as SO4] | 2 | 1 | 0 |
NPDES PR0023761: inspections, violations and enforcement
NPDES PR0023761: 7 single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| April 6, 2026 | Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| March 20, 2026 | Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| March 18, 2026 | Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| March 12, 2026 | Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| March 4, 2026 | Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| March 3, 2026 | Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| October 12, 2025 | Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
NPDES PR0023761: 1 inspection
| Date | What EPA recorded | Agency |
|---|---|---|
| January 27, 2026 | Evaluation | E |
NPDES PR0023761 (PRASA SANTA ISABEL WWTP): no formal enforcement action and informal enforcement action on file.
Watch NPDES PR0023761
NPDES PR0023761: one email when its EPA record changes — $99/month.
Permits near NPDES PR0023761
NPDES PR0023761: 51 pollutant rows, 8 dated events; ICIS-NPDES download, loaded October 14, 2026.