Water report · not indexed
What is in the water at 00966
3 public water systems serve this ZIP code in the federal records. Everything below comes from EPA monitoring data, and everything missing is named.
METROPOLITANO
PWSID PR0002591 · PR · serves 1,077,332 people
PFAS and lithium
8 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 25 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| 6:2 FTS | 0.049 µg/L | 1 | 1/15/2025 |
| 8:2 FTS | 0.015 µg/L | 1 | 1/15/2025 |
| PFOA | 0.011 µg/L | 2 | 7/11/2024 |
| PFBA | 0.0086 µg/L | 6 | 7/18/2024 |
| PFOS | 0.0078 µg/L | 10 | 7/18/2024 |
| PFDA | 0.0075 µg/L | 1 | 1/15/2025 |
| PFPeA | 0.004 µg/L | 2 | 4/17/2024 |
| PFHxA | 0.0035 µg/L | 2 | 7/11/2024 |
A detection is a measurement, not a violation and not a health finding. EPA states that UCMR 5 results do not indicate compliance or non-compliance with any limit.
Health-based violations
10 open health-based violation(s) recorded in SDWIS and not yet returned to compliance.
- TT · contaminant code 0300 · began 2018-11-01
- TT · contaminant code 0300 · began 2018-11-01
- TT · contaminant code 0200 · began 2018-11-01
- TT · contaminant code 0300 · began 2019-09-01
- TT · contaminant code 0300 · began 2019-05-01
- TT · contaminant code 0300 · began 2020-10-01
- TT · contaminant code 0300 · began 2020-10-01
- TT · contaminant code 0300 · began 2020-10-01
Hardness
Median hardness 140 mg/L as CaCO₃, measured at 2 stations serving this system across 20 results, 2015-02-25 to 2023-02-14. Measured in the water source and distribution area, not at a tap, and not in your home.
GUAYABOTA
PWSID PR0005186 · PR · serves 1,028 people
PFAS and lithium
Not sampled for PFAS. EPA’s UCMR 5 monitoring covered every system serving more than 3,300 people and only a sample of smaller ones. This system was not in it, so there is no result to show, which is not the same as a result showing nothing.
Health-based violations
No open health-based violation on record. This covers MCL, treatment technique and MRDL violations in SDWIS that have not been returned to compliance. It excludes monitoring and reporting violations, which are the large majority nationally, so this is not “no violations”, and SDWIS completeness varies by state.
Hardness
Median hardness 130 mg/L as CaCO₃, measured at 3 stations serving this system across 42 results, 2015-01-26 to 2023-02-08. Measured in the water source and distribution area, not at a tap, and not in your home.
BAYAMONCITO
PWSID PR0604086 · PR · serves 536 people
PFAS and lithium
Not sampled for PFAS. EPA’s UCMR 5 monitoring covered every system serving more than 3,300 people and only a sample of smaller ones. This system was not in it, so there is no result to show, which is not the same as a result showing nothing.
Health-based violations
No open health-based violation on record. This covers MCL, treatment technique and MRDL violations in SDWIS that have not been returned to compliance. It excludes monitoring and reporting violations, which are the large majority nationally, so this is not “no violations”, and SDWIS completeness varies by state.
Hardness
Too few readings to state a hardness. 1 station(s), 17 result(s). Below two stations and five results this page will not state a number: a median of two readings from one creek is not your water.
What this report cannot tell you
Every figure describes water at a sampling point: a treatment plant, an entry point to the distribution system, or a monitoring station. None of it describes water arriving at your tap. Plumbing between the two can add lead and copper, and if your home was built before 1986 a test kit tells you something no federal dataset can.
Sources: EPA UCMR 5 occurrence (final release, frozen July 2026) · EPA SDWIS health-based violations · USGS and state monitoring via the Water Quality Portal · EPA Public Water System Service Area Boundaries v3. Compiled 2026-09-01.