Clean Water Act discharge permit · NPDES PR0020834
PRASA SAN LORENZO WWTP, San Lorenzo, PR: NPDES PR0020834 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 32Pollutants under a numeric limit
- 27Pollutants with an effluent exceedance
PRASA SAN LORENZO WWTP, held by PRASA SAN LORENZO, holds NPDES permit PR0020834, which discharges to Rio Loisa. EPA’s file records it issued December 26, 2001 and expiring March 31, 2007. 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 | PRASA SAN LORENZO WWTP |
|---|---|
| Permittee as filed | PRASA SAN LORENZO |
| NPDES ID | PR0020834 |
| 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 | December 26, 2001 |
| Expiration date | March 31, 2007 |
| Address | San Lorenzo, PR 00754 |
| Receiving water | RIO LOISA |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Rio Grande de Loiza at Carraizo Dam (HUC 210100050409) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 33Pollutants on file
- 32Under a numeric limit
- 33With a violation of any kind
- 27With 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 10 | 176 | 126 | February 28, 2010 | 7,900% over the limit |
| Chlorine, total residual | 2 | 125 | 120 | May 31, 2012 | 27,900% over the limit |
| BOD, 5-day, 20 deg. C | 10 | 130 | 79 | June 30, 2007 | 99,999% over the limit |
| Phenolics, total recoverable | 3 | 68 | 60 | May 31, 2006 | 19,500% over the limit |
| Copper, total [as Cu] | 2 | 67 | 56 | January 31, 2008 | 3,729% over the limit |
| Lead, total [as Pb] | 2 | 60 | 49 | May 31, 2006 | 1,900% over the limit |
| Cadmium, total [as Cd] | 2 | 57 | 44 | May 31, 2006 | 585% over the limit |
| Color [PT-CO units] | 2 | 46 | 40 | May 31, 2005 | |
| Ammonia, unionized | 0 | 40 | 37 | February 28, 2002 | 767% over the limit |
| Arsenic, total [as As] | 2 | 43 | 31 | May 31, 2006 | 15,456% over the limit |
| Solids, suspended percent removal | 1 | 40 | 30 | February 28, 2010 | 567% over the limit |
| Sulfide, total [as S] | 1 | 42 | 24 | May 31, 2005 | 49,900% over the limit |
| Manganese, total [as Mn] | 3 | 32 | 24 | January 31, 2006 | 508% over the limit |
| Cyanide, total [as CN] | 2 | 31 | 20 | September 30, 2009 | 246% over the limit |
| BOD, 5-day, percent removal | 1 | 27 | 17 | January 31, 2006 | 187% over the limit |
| Flow, in conduit or thru treatment plant | 2 | 21 | 16 | May 31, 2005 | 602% over the limit |
| Coliform, total general | 1 | 23 | 13 | April 30, 2007 | 99,999% over the limit |
| pH | 2 | 22 | 12 | January 31, 2013 | |
| Nitrite + Nitrate total [as N] | 1 | 17 | 12 | January 31, 2013 | 62,212% over the limit |
| Nitrogen, ammonia, total [as NH3] | 2 | 27 | 11 | June 30, 2007 | 460% over the limit |
| Coliform, fecal general | 2 | 16 | 10 | December 31, 2006 | 99,999% over the limit |
| Mercury, total [as Hg] | 2 | 25 | 9 | May 31, 2006 | 1,880% over the limit |
| Sulfide-hydrogen sulfide [undissociated] | 1 | 19 | 6 | May 31, 2005 | 450% over the limit |
| Turbidity | 1 | 9 | 3 | October 31, 2004 | |
| Phosphorus, total [as P] | 1 | 8 | 3 | August 31, 2003 | 569% over the limit |
| Temperature, water deg. centigrade | 1 | 7 | 2 | June 30, 2011 | 2% over the limit |
| Oxygen, dissolved [DO] | 1 | 6 | 1 | July 31, 2007 | 97% over the limit |
| Fluoride, total [as F] | 1 | 14 | 0 | ||
| Oil & Grease | 4 | 13 | 0 | ||
| Zinc, total [as Zn] | 2 | 10 | 0 | ||
| Surfactants [MBAS] | 1 | 10 | 0 | ||
| Coliform, fecal - % samples exceeding limit | 1 | 8 | 0 | ||
| Solids, settleable | 1 | 5 | 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 PR0020834.
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.
Watch this permit
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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 PR0020834 there.
Nearby on the register
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- Every permit record in San Lorenzo, A to Z
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- Every permit record in Puerto Rico, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.