San Sebastian Water Quality
Puerto Rico
According to EPA SDWIS, San Sebastian, Puerto Rico is served by 4 community water systems covering about 26,773 people. The same extract lists 49 health-based violation records, most recently coded 8000 in 2024. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in San Sebastian, Puerto Rico is delivered through 4 EPA-regulated community water systems serving an estimated 26,773 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.
PlainEnviro's health-based SDWIS extract shows 49 violation records across the 4 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 6 distinct EPA contaminant codes: Revised Total Coliform Rule, LEAD AND COPPER RULE REVISIONS, Total Haloacetic Acids (HAA5), Coliform (TCR), TTHM and 1 others.
A past EPA health-based registry row does not describe water delivered today or current compliance status; utilities notify customers and remediate under state primacy oversight when required. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the Puerto Rico drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.
Community Water Systems
| System Name | Pop. Served | Violations | Status |
|---|---|---|---|
| SAN SEBASTIAN | 25,752 | 36 | Health |
| ACUEDUCTO COMUNAL SONADOR INC. | 600 | 7 | Health |
| ACUED. RURAL GUACIO | 340 | 5 | Health |
| ACUEDUCTO RURAL GUADALUPE MARTI | 81 | 1 | Health |
Does this city have health-based water violations?
These health-based records can represent Maximum Contaminant Level (MCL), Treatment Technique (TT), or Maximum Residual Disinfectant Level (MRDL) categories. A historical record does not establish that water is currently unsafe.
| Water system | Contaminant | Begin Date |
|---|---|---|
| ACUEDUCTO COMUNAL SONADOR INC. | Revised Total Coliform Rule | 2024-12-01 |
| ACUEDUCTO RURAL GUADALUPE MARTI | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| ACUED. RURAL GUACIO | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| ACUEDUCTO COMUNAL SONADOR INC. | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| SAN SEBASTIAN | Total Haloacetic Acids (HAA5) | 2020-04-01 |
| SAN SEBASTIAN | Total Haloacetic Acids (HAA5) | 2020-04-01 |
| SAN SEBASTIAN | Total Haloacetic Acids (HAA5) | 2018-10-01 |
| SAN SEBASTIAN | Total Haloacetic Acids (HAA5) | 2018-10-01 |
| SAN SEBASTIAN | Total Haloacetic Acids (HAA5) | 2018-04-01 |
| SAN SEBASTIAN | Total Haloacetic Acids (HAA5) | 2018-04-01 |
| SAN SEBASTIAN | Total Haloacetic Acids (HAA5) | 2018-01-01 |
| SAN SEBASTIAN | Total Haloacetic Acids (HAA5) | 2018-01-01 |
| ACUEDUCTO COMUNAL SONADOR INC. | Revised Total Coliform Rule | 2017-04-01 |
| ACUEDUCTO COMUNAL SONADOR INC. | Revised Total Coliform Rule | 2017-04-01 |
| ACUEDUCTO COMUNAL SONADOR INC. | Coliform (TCR) | 2016-03-01 |
| ACUEDUCTO COMUNAL SONADOR INC. | Coliform (TCR) | 2016-03-01 |
| SAN SEBASTIAN | Coliform (TCR) | 2016-02-01 |
| SAN SEBASTIAN | Coliform (TCR) | 2016-02-01 |
| SAN SEBASTIAN | TTHM | 2016-01-01 |
| SAN SEBASTIAN | TTHM | 2016-01-01 |
| SAN SEBASTIAN | Total Haloacetic Acids (HAA5) | 2016-01-01 |
| SAN SEBASTIAN | Total Haloacetic Acids (HAA5) | 2016-01-01 |
| SAN SEBASTIAN | Total Haloacetic Acids (HAA5) | 2015-10-01 |
| SAN SEBASTIAN | Total Haloacetic Acids (HAA5) | 2015-10-01 |
| SAN SEBASTIAN | TTHM | 2015-07-01 |
| SAN SEBASTIAN | TTHM | 2015-07-01 |
| SAN SEBASTIAN | Total Haloacetic Acids (HAA5) | 2015-07-01 |
| SAN SEBASTIAN | Total Haloacetic Acids (HAA5) | 2015-07-01 |
| ACUED. RURAL GUACIO | Coliform (TCR) | 2015-05-01 |
| ACUED. RURAL GUACIO | Coliform (TCR) | 2015-05-01 |
| SAN SEBASTIAN | TTHM | 2015-04-01 |
| SAN SEBASTIAN | TTHM | 2015-04-01 |
| SAN SEBASTIAN | Total Haloacetic Acids (HAA5) | 2015-04-01 |
| SAN SEBASTIAN | Total Haloacetic Acids (HAA5) | 2015-04-01 |
| SAN SEBASTIAN | TTHM | 2015-01-01 |
| SAN SEBASTIAN | TTHM | 2015-01-01 |
| SAN SEBASTIAN | Total Haloacetic Acids (HAA5) | 2015-01-01 |
| SAN SEBASTIAN | Total Haloacetic Acids (HAA5) | 2015-01-01 |
| SAN SEBASTIAN | TTHM | 2014-10-01 |
| SAN SEBASTIAN | TTHM | 2014-10-01 |
| SAN SEBASTIAN | Total Haloacetic Acids (HAA5) | 2014-10-01 |
| SAN SEBASTIAN | Total Haloacetic Acids (HAA5) | 2014-10-01 |
| SAN SEBASTIAN | TTHM | 2014-07-01 |
| SAN SEBASTIAN | TTHM | 2014-07-01 |
| SAN SEBASTIAN | Total Haloacetic Acids (HAA5) | 2014-07-01 |
| SAN SEBASTIAN | Total Haloacetic Acids (HAA5) | 2014-07-01 |
| ACUED. RURAL GUACIO | Coliform (TCR) | 2012-12-01 |
| ACUED. RURAL GUACIO | Coliform (TCR) | 2012-12-01 |
| ACUEDUCTO COMUNAL SONADOR INC. | Surface Water Treatment Rule | 1992-01-01 |
What are San Sebastian's health-based records for?
San Sebastian's health-based violation records carry 6 distinct EPA codes: some name a substance, others the drinking-water rule that was breached. Counts are records on file in the EPA SDWIS extract, not current test results.
| Contaminant | Records | Systems |
|---|---|---|
| Total Haloacetic Acids (HAA5) | 22 | 1 |
| Tthm | 12 | 1 |
| Coliform (TCR) | 8 | 3 |
| Lead and Copper Rule Revisions | 3 | 3 |
| Revised Total Coliform Rule | 3 | 1 |
| Surface Water Treatment Rule | 1 | 1 |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in San Sebastian, Puerto Rico? ▼
How many water violations does San Sebastian have in this EPA extract? ▼
What contaminants were found in San Sebastian water? ▼
How many water systems serve San Sebastian? ▼
Where does San Sebastian get its drinking water? ▼
How does San Sebastian compare in Puerto Rico?
Of the 69 Puerto Rico places with at least one community water system on file, San Sebastian ranks #37 by number of systems (4).
Either side of it: Manati (4), Naguabo (4), Aguadilla (3), Anasco (3)
About This Data
Figures here are the current EPA SDWIS extract joined to the 4 community water systems whose service area lists San Sebastian, ranked against the 69 Puerto Rico places with at least one system on file. Data current as of 2026-08-25.
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.
A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.
TRI facility data comes from the EPA Toxic Release Inventory. Facilities shown are those that self-report to the TRI program. PlainEnviro presents this data without advocacy framing.
Read our methodology - how this data is sourced, computed, and verified.