San Sebastian, PR · PWSID PR0003303
San Sebastian lead service lines
2 lead or galvanized lines to replace
San Sebastian reported 0 lead and 2 galvanized-requiring-replacement service lines out of 10,773 in its inventory. That's about 1 in 5,387 lines. Another 3,585 (33%) are still listed as unknown material.
Ranks #26 of 56 Puerto Rico systems with confirmed lead lines, and #6,188 nationally.
<0.1% of San Sebastian's service lines are lead or galvanized requiring replacement. That's higher than the Puerto Rico average (<0.1%) and lower than the national average (3.1%).
- Lead 0%
- Galvanized (replace) <0.1%
- Unknown 33%
- Non-lead 67%
Total service lines reported: 10,773. Reported all required service line types. Population served: 25,752; 9,645 connections.
The most recent lead sampling period in EPA data (starting 01-JUL-2015) did not exceed the 15 ppb action level. Results are a 90th percentile across sampled homes, so individual homes can still be higher.
Progress since 2025 Q1
Reported lead and galvanized-requiring-replacement lines went from 2 in 2025 Q1 to 2 in 2026 Q3: no change. Lines of unknown material went from 3,585 to 3,585, no change.
Quarterly counts reported to EPA. A drop usually means lines were replaced or confirmed non-lead; a rise usually means more lines were identified. Replacement progress rankings.
Lead rule violations
EPA's data lists 1 Lead and Copper Rule violation since 2015 for San Sebastian. Health-based violations are treatment failures, such as corrosion control or public education; the rest are missed monitoring or reporting.
| Began | Violation | Status |
|---|---|---|
| Jan 2016 | Lead consumer notice not delivered or reported | Returned to compliance |
Source: EPA SDWIS violation records for the Lead and Copper Rule.
Where the water comes from
San Sebastian's main water source is surface water (rivers, lakes or reservoirs).
Source: EPA SDWIS water system and facility records.
Check your own address
These counts cover the whole system. To see whether your line is lead, use the utility's address-level inventory. Utilities had to prepare one by October 16, 2024 and make it publicly accessible; systems serving more than 50,000 people must post it online.
No map yet? Do the 2-minute scratch and magnet test on the pipe where water enters your home.
Protect your drinking water now
If your line is lead, galvanized or unknown, filter water for drinking, cooking and baby formula. Use a filter certified to NSF/ANSI 53 for lead. Run cold water for a few minutes after it sits for hours, and never use hot tap water for cooking.
How to pick a lead-certified filter · How to test your water for lead
Getting the line replaced
EPA's Lead and Copper Rule Improvements require most systems to replace lead and galvanized-requiring-replacement lines by December 31, 2037. Ask San Sebastian whether it replaces the private side for free or with a cost share before you hire anyone. If you want it done sooner, or your utility doesn't cover your side, a licensed plumber can quote it. What replacement costs.
County pages: Lead pipes in San Sebastian Municipio County
Other water systems nearby
| System | Lead + galv. | Unknown |
|---|---|---|
| Lago Guajataca | 0 | 1,518 |
| Lavadero | 0 | 0 |
| Wilfredo Valentin | 0 | 60 |
Check another water system
Questions
Does San Sebastian have lead pipes?
Yes. San Sebastian reported 0 lead service lines and 2 galvanized lines that must be replaced, out of 10,773 total. 3,585 more are of unknown material.
How do I check if my home's service line is lead?
Look up your address on San Sebastian's official service line inventory, which utilities must make publicly available. You can also scratch the pipe where it enters your home: lead is soft, dull gray, scratches to shiny silver and does not attract a magnet.
When will San Sebastian replace lead service lines?
Under EPA's Lead and Copper Rule Improvements, most systems must replace lead and galvanized-requiring-replacement lines by December 31, 2037, starting from November 1, 2027. The rule is being challenged in court, so dates could change. Many utilities run free or cost-share programs now.
Has San Sebastian had lead violations?
EPA's data shows 1 Lead and Copper Rule violation since 2015 for San Sebastian.
Which water filters remove lead?
Use a filter certified to NSF/ANSI Standard 53 for lead reduction, or NSF/ANSI 58 for reverse osmosis. Check the certification on NSF's listings, not just the box.
Embed or cite this data
Local news sites, blogs and community groups can embed this card. It updates when EPA releases new data.
Citation: Lead Pipe Map, "San Sebastian lead service lines," https://leadpipemap.com/pr/san-sebastian/. Source: EPA SDWIS service line inventory, 2026 Q3. Download the full dataset on the data page.